
PERFORMANCE SPECIFICATION
FOR
SHARED RECONNAISSANCE POD (SHARP)
IMAGING SENSORS
1. SCOPE
*1.1
Scope *1.2
Classification *2. APPLICABLE DOCUMENTS
*2.1
General *2.2
Government documents *2.2.1
Specifications, Standards and Handbooks *2.2.2
Other Government Documents, Drawings and Publications *2.3
Non-Government Publications *3. REQUIREMENTS
*3.1
General *3.1.1
Equipment Definition *3.1.2
Key Performance Parameters *3.2
First Article TBD *3.3
Materials *3.4
Performance characteristics *3.4.1
Imaging requirements *3.4.1.1
High altitude imaging requirements *3.4.1.1.1
Field of coverage *3.4.1.1.2
Field of regard *3.4.1.1.3
Sensor pointing *3.4.1.2
Medium altitude imaging requirements *3.4.1.2.1
Field of coverage *3.4.1.2.2
Field of regard *3.4.1.2.3
Sensor pointing *3.4.1.3
Image Quality *3.4.1.4
Stabilization *3.4.1.5
Imaging Conditions *3.4.1.6
Target Characteristics *3.4.2
Logistics and Readiness *3.4.2.1
General *3.4.2.2
Reliability, Maintainability, and Operational Availability *3.4.2.2.1
Reliability *3.4.2.2.2
Operational Availability (AO) *3.4.2.2.3
Durability *3.4.2.2.4
Maintainability *3.4.2.2.5
Weapon Replaceable Assembly Moisture *3.4.2.3
BIT Performance *3.4.2.3.1
Failure Detection *3.4.2.3.2
Failure Isolation *3.4.2.3.3
BIT False Alarms *3.4.2.3.4
BIT Tolerance and Filtering *3.5
Interface definition *3.5.1
Physical interface TBD Raytheon *3.5.2
Electrical power Interface TBD (Mel) *3.5.3
Optical interface TBD (Mel) *3.5.4
Data interfaces *3.5.4.1
Imagery data interfaces *3.5.4.1.1
Full resolution imagery data interface TBD (Dale LinneVonBerg/Mike Colbert) *3.5.4.1.2
Reduced resolution imagery data interface TBD - (Dale LinneVonBerg/Mike Colbert) *3.5.4.2
Navigation data interface TBD- (Dan Crabtree) *3.5.4.3
Sensor pointing data interface TBD (Raytheon Indy) *3.5.4.4
Sensor command and control interface TBD (Dale LinneVonBerg/Mike Colbert) *3.5.4.5
BIT requirements *3.5.4.5.1
General *3.5.4.5.2
BIT Interfaces *3.5.4.5.3
Fault Logs *3.5.4.5.4
Elapsed Time Indication *3.6
Environmental Conditions *3.6.1
Operational Flight Envelope *3.6.2
Aircraft Maneuvering Environment *3.6.3
Sensor Bay Environment *3.6.3.1
Temperature TBD (Raytheon Indy) *3.6.3.2
Temperature shock TBD (Raytheon Indy) *3.6.3.3
Humidity TBD (Raytheon Indy) *3.6.3.4
Shock TBD (Raytheon Indy) *3.6.3.4.1
Service Shock. *3.6.3.4.2
Crash Safety Shock. *3.6.3.5
Vibration TBD (Raytheon Indy) *3.6.3.6
Acoustic Noise TBD (Raytheon Indy) *3.6.3.7
Fungus *3.6.4
Electromagnetic Compatibility TBD (NAWCAD EMC Branch, 5.1.7.1) *3.6.4.1
Emission and Susceptibility Requirements. *3.6.4.1.1
MIL-STD-461 Requirements *3.6.4.1.2
Subsystem Test *3.6.4.1.3
Specific MIL-STD-461 Requirements *3.6.4.2
Relay Transient Immunity *3.6.4.3
Ground Plane Noise Immunity *3.7
Physical Characteristics TBD *3.7.1
Electrical TBD *3.7.2
Thermodynamics TBD *3.7.3
Weight TBD (Raytheon Indy) *3.7.4
Installation TBD (Raytheon Indy) *3.7.5
Grounding, balancing, and interconnect requirements TBD - (NAWCAD EMC Branch, 5.1.7.1) *3.7.5.1
Grounding Requirements *3.7.5.1.1
Aircraft Grounding *3.7.5.1.2
3.3.2.3.2 Primary Power Grounding. *3.7.5.1.3
Signal Grounding. *3.7.5.1.4
Shield Grounding *3.7.5.1.5
Component Grounding *3.7.5.1.6
Interconnect Wire Shielding *3.7.5.1.7
DMS A/C Bonding Requirement *3.7.5.1.8
3.3.2.3.8 Device Sensitive to Electrostatic Discharge. *3.7.6
Aerodynamics TBD *3.7.7
Survivability TBD *3.7.8
Design and Construction TBD *3.7.8.1
Materials, Processes and Parts. *3.7.8.1.1
Materials. *3.7.8.1.2
Processes *3.7.8.1.3
Parts *3.7.9
Equipment identification TBD *3.7.10
Interchangeability TBD *3.7.11
Color TBD *3.8
Integrated Logistics and Support *3.8.1
Support Equipment *3.8.2
Storage Containers *3.9
Safety *3.10
Security *3.11
Information Security *3.12
Human Factors Engineering - TBD *3.13
Non-development Items TBD *4. VERIFICATION TBD
*4.1
General *4.2
Inspections *4.3
Physical characteristics *4.3.1
Physical dimensions *4.3.1.1
Weight *4.3.1.2
Mounting interface *4.3.1.3
Grounding *4.3.1.4
Safety *4.3.1.5
Physical security *4.3.1.6
Sensor optical characteristics *4.4
Performance tests *4.4.1
Electrical Interface tests *4.4.2
Environmental tests *4.4.3
Imaging performance *5. PACKAGING
*6. NOTES
*6.1
Intended Use *6.2
Acquisition Requirements *This specification covers a reconnaissance sensor(s) which will be installed in a Shared Reconnaissance Pod (SHARP) mounted on an F/A-18E/F aircraft. The SHARP system on the F/A-18E/F will replace the existing F-14 Tactical Airborne Reconnaissance Pod System currently deployed by the USN.
The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed.
The following specifications, standards and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2).
MIL-E-5400T Military Specification, Electronic Equipment, Aerospace General Specification For.
MIL-STD-704E Military Standard, Aircraft Electrical Power
MIL-STD-2500B National Imagery Transmission Format Standard 2.1
MIL-STD-1760C(1) Military Standard, Aircraft/Store Electrical Interconnection System, dated 2 March 1999
MIL-E-6051D(1) Electromagnetic Compatibility Requirements, Systems
MIL-STD-810E(3) Shock and Vibration, dated 31 July 1995
MIL-HDBK-310 Global Climatic Data for Developing Military Products, dated 23 June 1997
(Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094)
The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation.
The U. S. Navy requires an organic, all-weather, day/night, manned, tactical air reconnaissance capability to provide continuous and immediate intelligence support to the Battle Group Commander (BGC) in the prosecution of independent, joint, or combined operations as well as to provide intelligence data for the security of those forces under his/her command. This capability is required to replace the F-14 Tactical Air Reconnaissance Pod (TARPS) capability, scheduled for phase-out in FY03. To meet this requirement, the Department of the Navy will incorporate a SHAred Reconnaissance Pod (SHARP) on the centerline of the F/A-18E/F that will employ a suite of sensors to collect infrared, visible, and synthetic aperture radar (SAR) digital imagery at medium and high altitudes. The required capability described herein must be supportable within the capability of the deployed carrier air wing or the F/A-18E/F aircraft forward deployed support posture. The complete airborne reconnaissance system must employ digital technology and be compatible with Common Imagery Ground/Surface System (CIG/SS) compliant ground stations. The reconnaissance system must include overflight and standoff capability in both day and night conditions. The full range of reconnaissance capability may be provided through separate and interchangeable medium and high altitude sensors that can be easily reconfigured into optimum mission suites. However, a single sensor that could meet both medium and high altitude requirements is desirable. To ensure true multi-mission capability of the F/A-18E/F aircraft the SHARP pod must be capable of being installed or removed with full mission turnaround capability of less than one hour.
This specification defines the requirements for the visible and infrared imaging reconnaissance sensors to be incorporated in the SHARP system.
The SHARP sensor suite shall consist of a sensor or sensors capable of operating in the visible and Infrared portions of the spectrum as defined herein, and such other equipment necessary to interface the sensors with the SHARP pod, the recording medium, and the data link system.
Key Performance Parameters are shown in table I. For design purposes, all National Imagery Interpretability Rating Scale (NIIRS) resolution requirements shall be computed as being that spatial resolution at the exact midpoint of each NIIRS scale level.
TABLE I. Key performance Parameters
|
Requirement |
Threshold |
Objective |
|
Resolution, Med Alt Overflight, Visible |
VIS NIIRS 6 |
VIS NIIRS 7 |
|
Resolution, Med Alt Overflight, Infrared |
IR NIIRS 5 |
IR NIIRS 6 |
|
Resolution, Med Alt Standoff, Visible |
VIS NIIRS 4 |
VIS NIIRS 5 |
|
Resolution, Med Alt Standoff, Infrared |
IR NIIRS 3 |
IR NIIRS 4 |
|
Resolution, High Alt Standoff, Visible |
VIS NIIRS 5 |
VIS NIIRS 6 |
|
Resolution, High Alt Standoff, Infrared |
IR NIIRS 4 |
IR NIIRS 5 |
|
Operational Availability (SHARP System) |
0.70 |
0.85 |
Materials, processes and parts used in the manufacture of the SHARP sensors shall be of high quality, suitable for the purpose, and shall conform to applicable Government and commercial specifications. All materials used shall be fungus inhibiting
The sensor imaging requirements are summarized in table II, and described in the following paragraphs. Imaging performance requirements shall be met throughout the operating and maneuvering environments specified in section 3.7, for the three mission scenarios described in appendix TBD.
TABLE II. Imaging Requirements
|
Requirement |
Threshold |
Objective |
|
Medium altitude standoff, visible, maximum slant range (along optical centerline) |
15nm |
20nm |
|
Medium altitude standoff, infrared, maximum slant range (along optical centerline) |
15nm |
20nm |
|
High altitude standoff, visible, maximum slant range (along optical centerline) |
45nm |
50nm |
|
High altitude standoff, infrared, maximum slant range (along optical centerline) |
25nm |
30nm |
|
Resolution, overflight, visible |
VIS NIIRS 6 |
VIS NIIRS 7 |
|
Resolution, overflight, infrared |
IR NIIRS 5 |
IR NIIRS 6 |
|
Resolution , medium altitude standoff, visible |
VIS NIIRS 4 |
VIS NIIRS 5 |
|
Resolution , medium altitude standoff, infrared |
IR NIIRS 3 |
IR NIIRS 4 |
|
Resolution , high altitude standoff, visible |
VIS NIIRS 5 |
VIS NIIRS 6 |
|
Resolution , high altitude standoff, infrared |
IR NIIRS 4 |
IR NIIRS 5 |
|
Field of regard, medium altitude, visible/infrared (wingtip-to-wingtip through nadir) |
180 deg |
N/A |
|
Field of regard, high altitude standoff, visible/infrared |
Horizon-to-45 deg depression (left & right sides) |
180 deg (wingtip-to-wingtip through nadir) |
The sensor(s) shall provide an effective cross-track field of coverage of no less than 3 degrees, and continuous coverage along the line of flight, with no holidays. It is desired that the sensor(s), when operated at non limiting v/h values, be capable of correspondingly larger cross track coverage. This requirement shall be attained throughout the high altitude operating envelope described in table IV and at all standoff ranges up to the maximum specified for the high altitude mission in table II. Field of coverage is defined as the angular coverage regardless of the sensors lens/FPA instantaneous field of view.
The sensors field of regard shall be from the horizon to a depression angle of 45 degrees below the horizon on both the left and right sides of the aircraft. A horizon to horizon field of regard (through nadir below the aircraft) is desired. Obscuration due to aircraft structure or ordnance shall be allowed.
The sensor(s) pointing accuracy shall be within + 10 percent of the sensor angular coverage, as defined in paragraph 3.4.1.1.1.
The sensor(s) minimum slew rate shall be sufficient to maintain the pointing accuracy specified herein.
The sensor(s) maximum slew rate shall not exceed 100 degrees per second.
Unless otherwise stated, the following requirements apply to both the medium altitude overflight and medium altitude standoff missions.
The sensor shall provide an effective cross-track field of coverage of 20 degrees, and continuous coverage along the line of flight, with no holidays. It is desired that the sensor(s), when operated at non limiting v/h values, be capable of correspondingly larger cross track coverage. This requirement shall be attained throughout the medium altitude sensor operating envelope in table IV and at all standoff ranges up to the maximum specified for the high altitude mission in table II. Field of coverage is defined as the angular coverage regardless of the sensors lens/FPA instantaneous field of view.
The sensors field of regard shall be 180 degrees, from horizon to horizon through nadir below the aircraft. Obscuration due to aircraft structure or ordnance shall be allowed. .
The sensor(s) pointing accuracy shall be within + 10 percent of the sensor angular coverage, as defined in paragraph 3.4.1.2.1.
The sensor(s) slew rate shall be sufficient to maintain the pointing accuracy specified herein.
The sensor(s) maximum slew rate shall not exceed 100 degrees per second.
The sensor(s) shall be stabilized as required to meet the imaging performance and pointing accuracy specified herein throughout the "full performance" maneuvering envelope specified in table V, including aircraft buffeting due to air turbulence. Additionally, the stabilization shall correct for aircraft roll displacements of up to 30 degrees, and pitch and yaw displacements of up to 10 degrees.
The medium and high altitude, visible and infrared imaging performance requirements shall be attainable in a clear air mass, which is free of visible/infrared imagery obscurants, such as rain, fog, smoke, clouds, blowing sand etc For the purposes of design, performance shall be referenced to a Modtran 3.7, Tropical atmosphere model, using the Navy Maritime aerosol model. The specified medium and high altitude visible imaging performance shall be attainable at sun angles of not less than 10° . The specified medium and high altitude infrared imaging performance shall be attainable from one hour after to one hour before the thermal cross-over points. Graceful degradation of performance is allowable outside these ranges.
Targets shall be representative of the appropriate NIIRS scale for particular missions. The thermal contrast between a target and its background shall be 4 centigrade degrees. The visible contrast between a target and its background shall be TBD as defined by TBD.
The logistics and readiness requirements, including reliability and maintainability requirements are summarized in table III and described in more detail in subsequent paragraphs.
TABLE III. Logistics and Readiness Requirements
|
Requirement |
Threshold |
Objective |
|
Reliability: Mean Operating Hours Between Operational Mission Failure (MFHBOMF)1 |
75 |
100 |
|
Maintainability: Mean Corrective Maintenance Time for Operational Mission Failures (MCMTOMF)2<<tjoneed to specify whether O-level or I-level, or separate categories for both. I assume for sensor(s) there will be no O-level corrective maintenance, just I and D level. And I level may be just to remove and replace the sensor, to send the sensor back to depot for further repair>> |
1 hour |
45 mins |
|
Mean Operational Hours Between Unscheduled Maintenance Action (MFHBUMA)3 |
50 |
75 |
|
BIT Percent Correct Detection4 |
||
|
BIT Percent Correct Fault Isolation5 |
||
|
Mean Operating Hours Between False BIT Indication (MFHBFBI)6 |
||
|
Operational Availability |
0.80 |
0.90 |
The equipment shall be designed to meet the reliability requirements specified below throughout the service life of the equipment when operated as specified herein. These reliability requirements shall take into account manufacturing variability, component variability, component drift, test equipment accuracy, functional performance limits, operating environment influence and equipment aging.
The equipment, when operated in any combination of modes and natural environments, shall achieve a Mean Time Between Failure (MTBF) of greater than or equal to
The equipment, when operated in any combination of modes and natural environments, shall achieve a system Operational Availability (AO) of
98%.The equipment shall be capable of withstanding the derived service life operational usage environments (thermal, vibration, power cycling, CATS/Traps). The extreme environmental envelope shall not exceed the worst case operational limits as defined in paragraph
XXXXX.The equipment shall be maintainable for the service life and design usage specified herein and shall meet the following maintainability requirements.
The O-level MTTR required to meet operational objectives is
The equipment shall meet the MTTR and maximum repair time requirements at the Organizational Level (O-level), Intermediate Level (I-level) and Depot Level (D-level), including aircraft and equipment access times, as specified in table XX.
Table XX. Sensor repair times
|
Maintenance Level |
Mean Time To Repair |
Max Repair Time At 95th Percentile |
|
Organizational |
TBD hours |
TBD hours |
|
Intermediate |
TBD minutes |
TBD hours |
|
Depot |
TBD minutes |
TBD hours |
The equipment shall be designed so that maintenance (O-level) and decontamination can be conducted by personnel wearing chemical/biological protective clothing. The equipment shall be maintainable by the 5th percentile female and 95th percentile male.
There shall be no maintenance adjustments or alignments required at the sensor level for the equipment to meet its performance requirements. Any maintenance adjustments and alignments shall occur only during depot repair.
The equipment shall be designed to utilize modular space assignment. Each sensor shall be designed and constructed for repair by simple replacement of SRAs. Each sensor shall be comprised of SRAs.
BIT performance requirements apply to the complete set of BIT functions as defined herein.
BIT shall correctly isolate
The Supplier shall not be responsible for BIT ambiguities resulting from open circuits, short circuits, and grounds in interconnecting harnesses external to the equipment, but is encouraged to design to eliminate these ambiguities.
The BIT False Alarm Rate is defined as the number of BIT False Alarms divided by the number of Detected Failures. The equipment False Alarm Rate shall not exceed 5%. A BIT false alarm occurs when BIT identifies and logs a failure in the fault log that subsequently cannot be duplicated at organizational level maintenance, intermediate level maintenance or at the depot. Note that removals due to visual indications that cannot be duplicated at the depot are not included in the BIT false removal rate.
To preclude false Failure indications, each signal (function, parameter, etc.) shall have a corresponding accept/reject criteria that must be met before an equipment failure is indicated. The equipment design shall be such that upon recovery from a failed state each signal (function, parameter, etc.) shall return to a GO state within 1.0 second.
The supplier is responsible for all aspects of the BIT design which affect the BIT false removal rate, while adhering to the criteria for a failure, including the following:
The sensor imaging unit shall operate within the rotating center section of the SHARP pod, which provides a cylindrical volume 49.45 inches long and 20.8 inches in diameter. The sensor imaging unit, with stabilization system, shall be mounted at each end bulkhead. Additional WRAs shall be mounted within ___ volumes in the forward and aft avionics bays of the SHARP pod, measuring __________________ respectively. Detailed drawings of these volumes are in ________________.
The sensor(s) shall attain full imaging performance while imaging through a window mounted in the rotating center section of the pod. The inner surface of the window will be 10.9 inches from the centerline of the center section. The window will designed as follows:
The sensor shall provide full resolution imagery for archive on the digital storage system, and reduced resolution imagery for cockpit viewing as specified below.
The full resolution image format shall be NITFS 2.1
A SHARP Display Station-Afloat (SDS-A) and a SDS-Ground (SDS-G) will be developed to support aircrew training, validate mission results and target verification, and support maintenance personnel in visually assessing sensor performance.
Sensor control shall be achieved via a MIL-STD-1553__ interface. Sensor control commands shall include at a minimum:
a. Status Mode
- Off
- Standby
- Operate
- TBD
b. Operate Mode
- TBD
c. Coverage Mode
- TBD
d. Spectral Mode
- TBD
e. INS information input
- TBD
f. TBD
To aid the ground and flight crews in assessing sensor functional performance and identifying system failures, the sensor Built-In-Test (BIT) capability shall include as a minimum: Operational Readiness Test (ORT), Periodic BIT (PBIT), and operator Initiated BIT (IBIT) as defined below. Tests may be accomplished using any combination of hardware and software. BIT shall be self-contained within the equipment to accomplish failure detection and isolation without the assistance of support equipment at O-level. BIT shall be designed for maximum utilization of the equipments functional circuits to accomplish its purpose. Failures which do not impact mission performance (e.g., BIT circuitry failures) shall not cause O-level BIT failure indications.
When the equipment is in a NO-GO condition, as defined in the Interface Control Document (ICD), it shall not interfere with the proper operation of any interfacing equipment. When practical, the equipment should continue executing BIT in an attempt to recover from the failure.
Failure or degradation of BIT circuitry shall not cause failure or degradation of any other operational performance function(s).
BIT functions shall provide adequate information to allow equipment to establish and implement degraded modes of operation.
All sensor BIT functions shall make its BIT status available to interrogations from the MUX bus.
ORT is defined as those verification tests that are run upon sensor power-up, that ensure that the sensor is capable of properly communicating and performing all sensor input/output. The ORT shall be executed autonomously each time the sensor transitions from a Power-Off state to a Power-On state. The sensor shall not communicate on the MIL-STD-1553 Bus or High Speed Interface until completion of the ORT. ORT shall not require any operator intervention. The performance of associated equipment shall in no way be degraded, or interfered with, by the execution of ORT. The ORT shall verify all circuitry that directly or indirectly affects the sensor data interfaces prior to the enabling and normal use of that interface. The sensor shall maintain all of its outputs in the power up states as defined in the sensor ICD, until the successful completion of ORT. The equipment shall be capable of identifying whether a power-up condition is occurring during a warm start or cold start, and performing levels of testing which are consistent with that condition. The ORT shall support the overall BIT Failure Detection, Failure Isolation, Failure Recording, Failure Reporting, and False Alarm Rate requirements described herein. The time required to complete ORT shall support the start-up time requirements and shall not exceed 3 minutes excluding equipment warm-up and cool down time.
PBIT is defined as those verification tests that are executed periodically during the OFP. PBIT shall be a background operation during the equipment "OPERATE" mode. PBIT shall be designed to provide maximum operational capability and to provide rapid aircraft turnaround. Periodic BIT shall automatically execute subsequent to ORT or Initiated BIT being successfully run. The performance of associated equipment shall in no way be degraded, or interfered with, by the execution of PBIT. The execution of PBIT shall not affect sensor performance or require operator participation. PBIT shall support the overall BIT Failure Detection, Failure Isolation, Failure Recording, Failure Reporting, and False Alarm Rate requirements. The time required for Periodic BIT, to complete an evaluation of equipment performance and provide the results for transmission shall not exceed
XX second. PBIT shall be non-interruptive in nature, and occur at TBD intervals/frequency. PBIT shall monitor the operational status of the equipment, and shall provide notification to the aircrew in the event that the equipment should fail, such that the mission could not be completed .
IBIT is defined as those verification tests that are executed upon receipt of an external IBIT command. Initiated BIT performs a more complete set of BIT functions upon external command, to provide confidence that the equipment is operational during a pre-flight condition or to confirm the presence of a failure in-flight or in a post-flight condition. IBIT may interrupt normal system operation and may require operator participation. The performance of associated equipment will in no way be degraded, or interfered with, by the execution of IBIT. IBIT will support the overall BIT Failure Detection, Failure Isolation, Failure Recording, Failure Reporting, and False Alarm Rate requirements. In the Initiated Mode of operation, the time required for BIT to complete an evaluation of equipment performance and provide the results for transmission shall not exceed
XXX seconds.The sensor shall accept a Test Message from the RMS via the MIL-STD-1553 bus to control the Initiated BIT mode of operation. Unused bits in the message may be used for unique sensor tests.
The sensor shall provide a BIT reply message to the RMS via the MIL-STD-1553 bus to indicate equipment BIT status. Unused bits in the message may be used for unique sensor tests. The sensor shall provide a Sensor NO-GO in the function status word(s) which indicates an equipment failure has been detected that impacts the functional operation of the sensor (i.e., processor failure, memory failure, etc.). The sensor shall provide a Sensor Degrade in the function status word(s) which indicates that the sensor has detected a failure which does not impact the functional operation of the sensor (i.e., failures in redundant circuitry or non-critical functions). The equipment shall provide a Sensor NO-GO status in the function status if either the Sensor NO-GO or the Sensor Degrade function status bits are set.
Failure Recording is defined as the non-volatile storing and organization of sensor and SRA Failure data along with related data necessary to meet the BIT requirements of paragraph 3.2.1.4. Failures shall be organized and stored in a table. The table shall consist of records that detail whether the failure was detected during an ORT, IBIT, or PBIT; the particular test that failed; the functional fail associated with the failed test; the failed SRA (if available); sensor supplied time totalizing meter; sensor supplied critical box temperature; and up to 20 aircraft parameters. The sensor supplied box temperature shall be the temperature of the equipment at a critical location in the box. The non-volatile memory shall be sized such that there is 50% spare failure memory left over after satisfying the storage requirements of this paragraph and any other overhead usage deemed necessary by the Supplier. Each set of memory locations shall be readable via an independent command signal via the MUX bus. The recording of Failures and related data shall meet full performance without the loss or corruption of stored data in the presence of power transients, series of power transients, unintended loss of power, or other such anomaly occurring during the write cycle of a Failure record. As a goal, failure recording shall store and make available, to the MUX bus, internal error conditions such as timeouts or other conditions that may not necessarily satisfy the criteria of a Failure but may aid in integration and debug of the equipment. The sensor shall provide a mechanism (i.e. checksum, CRC, etc.) of validating the integrity of the non-volatile Failure memory.
Each sensor shall include a fault log in nonvolatile memory which is of sufficient size to redundantly store the following information for a minimum of five separate, most recent BIT failure events.//NEED TO LOOK AT
(a) BIT mode during which the failure was detected.
(b) BIT fault code(s).
(c) Associated function fail data.
(d) Failed sensor and subassembly (if available).
(e) BIT filter parameters (M of N and persistence counts).
(f) sensor supplied elapsed time indication.
(g) sensor supplied critical box temperature.
(h) sensor supplied electronic serial number, OFP and firmware identification.
(i) Up to 20 environmental parameters supplied by the aircraft.//NEED TO LOOK AT
Fault log contents shall be overwritten or erased only upon external command at the depot. Contents shall remain intact at power-up and any time BIT is rerun.//NEED TO LOOK AT
The recording of fault log data shall be unaffected by series of power transients or other anomalies which occur during the write cycle of a failure record.
The equipment shall provide an internal mechanism for validating the integrity of the non-volatile memory. Failures in the fault log memory shall not cause O-level BIT codes to be set.//NEED TO LOOK AT
The equipment shall include a digital solid state elapsed time circuit design (Time Totalizing Meter) capable of generating, recording, and storing elapsed time in nonresettable, nonvolatile memory. This circuit shall provide measurement and recording of total accumulated power-on time in one-tenth hour increments for not less than 99,999 hours. The stored time shall be accessible via a the MUX bus to display the total elapsed time on the cockpit displays or other suitable display with the equipment installed in the aircraft or on associated factory test equipment.
The sensor shall survive, operate, and/or perform within the environments specified below.
The SHARP sensor(s) shall survive (non-operating) throughout the limits of the basic aircraft (LBA) of the F/A-18E/F as defined in the F/A-18E/F NATOPS Flight Manual. In addition, the SHARP sensor(s) shall meet full performance requirements within the operating envelope summarized in table IV.
TABLE IV. SHARP operating envelope
|
Requirement |
Threshold |
Objective |
|
Minimum Speed (all missions) |
300 KGS |
200 KGS |
|
Maximum Speed (all missions) |
550 KGS |
600 KGS |
|
Minimum Altitude Medium Altitude Overflight/Standoff |
2,500ft AGL |
2,000 ft AGL |
|
Maximum Altitude Medium Altitude Overflight/Standoff |
20,000 ft AGL |
25,000 ft AGL |
|
Minimum Altitude High Altitude Standoff |
20,000 ft AGL |
15,000 ft AGL |
|
Maximum Altitude High Altitude Standoff |
45,000 ft AGL |
50,000 ft AGL |
The sensor shall survive and perform after the accelerations of table V are applied for a duration necessary to achieve the angular velocities in table V. The environments in table V are defined at the pod/aircraft mount structure interface.
TABLE V. SHARP maneuvering envelope
|
Environment |
Axis |
Angular Limits (deg)(1) |
Angular Velocities (deg/sec) |
Angular Accelerations(2) (deg/sec2) |
|
Non-operating |
Roll |
N/A |
LBA |
LBA |
|
Pitch |
N/A |
LBA |
LBA |
|
|
Yaw |
N/A |
LBA |
LBA |
|
|
Operating (without damage) |
Roll |
360 |
270 |
859 |
|
Pitch |
+ 90 |
50 |
172 |
|
|
Yaw |
360 |
50 |
115 |
|
|
Full Performance |
Roll |
+ 30 |
30 |
60 |
|
Pitch |
+ 10 |
20 |
30 |
|
|
Yaw |
+ 10 |
20 |
10 |
|
|
(1) Reduced by any platform line-of-sight obscurations. (2) At 0 degrees roll angle. "LBA" = to the Limits of the Basic Aircraft. |
||||
The sensor shall operate within the range of the ECS in the F/A-18E/F SHARP system. The sensor shall have the capability of operating within the internal temperature, pressure and humidity within the pod during all phases of flight throughout the flight envelope, ground operation, and taxi and maintenance conditions. The sensor shall meet all specified requirements and shall provide required performance, life, and reliability under any natural combinations of the service conditions specified herein.
The sensor shall operate to full performance in the SHARP pod within a temperature range from +4 to +32 degrees C, with a maximum rate of temperature change of + 0.14 C degrees per minute.
The sensor shall survive and operate in the SHARP pod during maximum rate of temperature change of TBD C degrees per minute.
The equipment design shall provide performance as specified herein and sustain no damage when subjected to a 100% humidity environment over its full temperature range. In addition, the equipment shall withstand without deterioration in performance or internal or external corrosion a humidity test consisting of 10, 24 hour cycles with 6 hours at 65oC and 95% to 100% relative humidity and 16 hours at 30oC and 80% relative humidity. Equipment operation shall be verified immediately after the 10 day exposure.
The equipment shall be designed so that no fractures or permanent deformations shall occur, no fixed part or assembly shall become loose, no moving or movable part of an assembly shall become free or sluggish in operation, no movable part or control shall shift in setting, position, or adjustment, and so that the performance shall be within the requirements of this performance specification. Any applicable burn-in environmental stress screening vibration requirements shall be considered as additional to these vibration design requirements.
The equipment shall fulfill specified requirements when subjected to the acoustic noise requirements identified in Figure
XX.The equipment shall contain no nutrient materials that will support the growth of any fungus under any combination of temperature and humidity conditions specified herein.
The sensor(s) must be electromagnetically compatible with itself and with the electronic systems and equipment installed both in the SHARP pod and onboard the host platform. The sensor(s) shall not be adversely affected or demonstrate performance degradation due to conducted and radiated electromagnetic energy from collocated systems. The sensor, as installed in the F/A-18E/F SHARP pod, shall comply with the system EMC requirements of MIL-E-6051D(1).
(Note: The use of filter pins to meet any of the following requirements must be approved by the procuring activity)
CE102 CS101 CS114(1) RE102(2) RS103(3)
(1) Curve 5 of Figure CS114-1.
(2) RE102 upper frequency limit shall be 80 dBm V/m at 21 GHz.
(3) The requirements for RS103 shall be met without and with metal overbraided cables. The levels of RS103 shall be as shown in Table V. The radiated field shall be modulated at 1 KHz 50% Duty Cycle.
The filter requirement of 4.3 of MIL-STD-461 shall not apply to the procured equipment. Engineering developmental testing shall replace the requirements of Electromagnetic Interference Control Plan (EMICP).
(a) Three volts RMS from 320 Hz to 500 Hz (not to exceed 10 Amps RMS).
(b) One Volt RMS from 500 Hz to 50 KHz (not to exceed 10 Amps RMS)
(c) 50 KHz to 100 MHz (not to exceed 1 Watt from a 50 ohm source)
(d) +/- 8 volt pulses, 100 microseconds wide at 100 pps, 10 microseconds wide at 1000 pps, 5 microseconds wide at 1000 pps, and 0.15 microseconds wide at 50 pps. (not to exceed 1 Ampere RMS current).
(e) +/- one volt DC (not to exceed 10 Amperes).
All sensors shall be electrically grounded in such a manner as to prevent ground loops and common ground returns for signal and power circuits, provide effective shielding for signal circuits to minimize EMI, and protect personnel from electrical hazards.
A wire of minimum length connected internally to the sensor chassis shall be provided at a pin on each primary power connector.
No circuit shall be allowed to utilize this wire as its primary return nor shall the chassis ground wire be attached to a grounded pin of a filter pin connector.
For grounding purposes, primary power is defined as electrical power which is conducted from aircraft bus power which is fused, switched, filtered, or attenuated.
A return for each source of primary power used in the sensor, whether connected to the internal chassis or not, shall be made available at a separate pin of each primary power connector.
Power return leads shall not be attached to the ground pin of a filter pin connector if used.
A signal is defined as electrical energy which contains information.
The following requirements apply to the electrical interfaces among sensors.
To ensure adequate rejection of the aircraft chassis noise, signal circuits shall be referenced to chassis ground in a manner that insures compatibility with the aircraft noise levels of 3.3.2.1.2.2.
Signals, whose fundamental frequency is above two MHz, shall be impedance matched to the transmission line.
Cable overbraid used on external cables for EMI suppression will be grounded through EMI backshells to the equipment chassis. If additional individual wire shields are also provided in the cable, a separate connector pin shall be provided for each wire shield. The connector shield pins shall be grounded to the equipment chassis inside the equipment adjacent to the connector mounting and by the shortest means practicable. A filter pin connector may also be used (if approved by the procuring activity) to ground the individual wire shields.
All externally exposed metal parts, shields, control shafts, switch handles, connectors, bushings, etc. shall be grounded to the chassis.
The use of shielded wiring and cables for sensor interconnect is discouraged. Compliance with MIL-STD-461 and MIL-STD-462 is not adequate justification for wire or cable shielding. Wire or cable shielding shall be used only for aircraft compatibility or circuit functional requirements.
The DMS shall have a means of creating and maintaining an electrical bond of 2.5 milliohms between an established fixed point on the equipment and the pod.
Design and construction of the equipment will meet all requirements of this specification.
Materials, processes and parts will meet the requirements specified herein.
Encapsulating and potting materials shall be hydrolytically stable. Conformal coatings shall be used.
All organic materials having ester linkages shall have been tested for hydrolytic stability.
All materials shall be selected such that no functional degradation or material deterioration shall occur following exposure to fluids commonly used in and around military aircraft and maintenance and storage facilities. These fluids include:
|
Fuel |
||
|
MIL-T-5624 Grade JP-4 |
Acetone |
O-A-51 |
|
MIL-T-5624 Grade JP-5 |
||
|
MIL-T-83133 Grade JP-8 |
Thinner |
MIL-T-81772 |
|
ASTM D-1655 |
||
|
JET A |
||
|
JET A-1 |
||
|
JET B |
||
|
Oil |
||
|
MIL-L-23699 |
||
|
DOD-L-85734 |
||
|
Hyd Fluid |
||
|
MIL-H-83282 |
||
|
MIL-H-8506 |
||
|
Dry-cleaning Solvent |
||
|
P-D-680 Type II |
||
|
Isopropyl Alcohol |
||
|
TT-I-735 |
||
|
Cleaning Compound |
||
|
MIL-C-85570 |
||
|
MIL-C-29608 |
||
The equipment and parts thereof shall be finished to withstand the environment required in this specification without showing signs of corrosion after pretreating the surface of cases, boxes, etc.
Design and manufacturing processes shall be in accordance with ANSI/J-STD-001A.
Screws used to attach the equipment to the aircraft shall be size 3/16 inch in diameter or larger unless specified otherwise herein. Fasteners requiring the use of tools other than standard Navy issue hand tools shall not be used in the equipment.
The unit external connectors, used to interface with aircraft wiring, shall be of the following type (or equivalent):
a. Miniature Circular, Environmental Resisting
b. Coaxial, triaxial, and fiber optical connectors shall be coordinated with SHARP IPT on an individual basis via the Interface Control Sheets in the SDL.
c. Filter pin connectors shall be approved by the SHARP IPT in writing via the Interface Control Sheets in the SDL.
(1) The filter shall be non-removable from the connector.
(2) The RF current rating of 4.14 shall be 3.0 Amperes.
(3) Only frequency band F of Table I shall apply.
(4) All pins passing through a filter pin connector shall be either filtered or grounded except for coaxial or triaxial signal lines.
(5) Bent pin conditions shall be considered for all pin assignments. The assignment/arrangement of pins shall be coordinated with and approved by SHARP IPT in writing via the external wiring diagram in the SDL.
Quantities, types, mounting methods and location, and clocking of the polarizing keys shall be coordinated with and approved by the SHARP IPT in writing. Spare pin assignments shall be coordinated with and approved in writing by the SHARP IPT.
sensor connectors shall be selected to mate with the following:
|
No. |
Designation |
Part No. |
Shell Size |
Contacts |
|
J1 |
Primary Power |
MS27467T11B35S |
11 |
13 #22D |
|
J2 |
High Speed Interface |
HFN 1045 |
11 |
4 #22D |
|
J3 |
Video Channel A |
5M1749-21B75PN |
21 |
4 #8 Triax |
|
J4 |
Discrete I/O |
MS27467T17B35P |
17 |
55 #22D |
|
J5 |
Video Channel B |
5M1749-21B75PA |
21 |
4 #8 Triax |
All electronic and electrical parts shall be electrically and thermally derated in application. The derating levels shall be consistent with the reliability and life requirements of paragraph 3.2.3. The derating shall be applied at the worst stress conditions of cooling for standard, normal or ground or fan cooling of section 3.2.1.5.2.3.
In addition, semiconductor and microcircuit junction temperatures shall not exceed 110 degrees C. All components shall apply derating at 57 degrees C sea level ambient and, if applicable, with an inlet temperature of per the standard cooling conditions of paragraph 3.2.1.5.2.3 for forced air or 32 degrees C for cockpit fan cooled air. Nominal unit and SRA power dissipation and the worst case steady state piece part stresses shall be used for derating compliance. Digital gallium arsenide (GA) components shall be limited to a maximum junction temperature of 150 degrees C and high power/high frequency GA components shall be limited to a maximum junction temperature of 200 degrees C.
Diodes which interface with external wiring and diodes that are used for coil suppression shall have an 600 Peak Inverse Voltage (PIV) rating or higher.
The design of the equipment using surface mount technology shall meet a minimum of one service life.
Printed circuit boards (PCB) using surface mount technology shall be designed to survive thermal cycling and vibration exposure for the service life. Leaded and leadless surface mount component solder joints, PCB plated through holes and vias shall provide a Miners cumulative damage ratio not more than 0.50 due to effects of thermal cycling and vibration over the service life exposure. The thermal cycle service life is defined by Table IV and the vibration qualification endurance requirements establish the vibration service life.
The solder joint analyses shall be supported by solder joint life testing on similar components, board materials and construction processes.
The sensor storage container(s) shall be designed to protect the sensor from shock and vibration which may occur during standard navy handling procedures. In addition, the sensor storage container(s) shall seal out harsh environments such as humidity, salt spray, sand, etc such as may occur during storage, and transportation.
Appropriate Industrial and Occupational Safety Health standards shall be incorporated into the system design. All operations and maintenance manuals will comply with MIL-STD-882 Series.
Physical security will be provided during development, testing and production commensurate with that to be provided at operational bases. The system will not require additional physical security beyond that already dedicated to tactical aircraft operating areas.
Security classification will be as contained in latest issue of OPNAVINST C5513.2C-26. Classified computer systems shall meet TEMPEST requirements. Sensitive information will be handled per DoD Directive 5400.7R
Maximum use thereof.
VERIFICATION TBDPerformance inspections shall be performed to verify that all requirements of Section 3 have been achieved.
The requirements specified in Section 3 shall be verified by the following methods.