System Capabilities Document

DISCOVERER II PROTOTYPE DEMONSTRATION
CONTRACT F04701-9X-C-00XX

[Provided under separate cover.
To obtain this document,
contact Lt Col Allan Netzer
at (703) 526-1724 or anetzer@jpo.org.]

DISCOVERER II PHASE I – Trade studies, prototype design(s) and objective system design(s).
DRAFT SOLICITATION, OFFER AND AWARD
1998 Sep 02

F04701-98-R-0045

Discoverer II Joint Program Office
Defense Advanced Research Projects Agency
3701 N. Fairfax Drive
Arlington, VA 22203

Attachment 1
Standard Scenario Description

The scenarios are crafted around six regions of interest (ROIs), each ROI containing twelve areas of interest (AOIs) as described in Figures 1.1,1.2 and Table 1.1. In addition to the latitude variations, ROI/AOI combinations A-C are larger than D-F. The variations are intended to provide insight into the revisit characteristics of alternative constellations. Furthermore, each scenario specifies operation in one or more modes as defined in the SCD (HRR-GMTI wide area search (WAS), acquisition, persistent tracking, and SAR spot, scan and strip). Six scenarios have been crafted for operating in a single mode over a single ROI, one for operating in a single mode over two ROIs simultaneously, and one for operating in a multi-mode over a single ROI. Two additional scenarios have been crafted to assess performance against worldwide "port watch" and to assess DTED collection.

Single Mode Scenarios: The scenarios require running the constellation in a single mode against each individual ROI, or in a single mode against two ROIs simultaneously. The combinations of modes and ROIs are described in Tables 1.2 and 1.3. These scenarios are designed to provide a parametric assessment of the system capabilities. The following provides a further description of the tasks to be accomplished in each of the scenarios in each of the modes. For all HRR-GMTI modes of operation, the target is 10dBsm, Swerling 1 radar cross section and the clutter is Gaussian at –15 dBsm sigma naught. TPMs for the HRR-GMTI modes should include: area collection rate, coverage times, revisit rates, statistics in terms of parameter histograms and cumulative distributions, probability of detection (PD) and probability of false alarm (PFA). For the HRR-GMTI acquisition and persistent tracking modes, TPMs should also include the probability of correct association figure of merit (PCAFOM) described in Attachment 2. The TPMs for SAR modes should include: coverage rate, collection time, revisit rate, RNIIRS, and revisit interval statistics in terms of histograms and cumulative distributions.

For all single mode cases, TPMs should also include satellite operating time statistics. Single mode scenario tasks include:

• WAS mode: repeatedly cover the entire ROI. Report TPMs for randomly oriented targets traveling at both 4kph and 15kph.
• Acquisition mode: repeatedly cover all AOIs within the specified ROI (170X170 km AOIs for ROIs A-C and 50X50 km AOIs for ROIs D-F). Report TPMs for randomly oriented targets traveling at both 4kph and 15kph.
• Persistent tracking: repeatedly visit individual targets at the center of each AOI with a revisit rate adequate to maintain track. Report TPMs for randomly oriented targets traveling at both 4kph and 15kph.
• Spot SAR: repeatedly cover 4kmx4km areas, oriented North/South (N/S) at the center of each AOI.
• Scan SAR: repeatedly cover 15kmx15km areas, oriented N/S at the center of each AOI.
• Strip SAR: repeatedly cover 50kmx50km areas, oriented N/S at the center of each AOI.
• HRR-GMTI Acquisition in two ROIs Simultaneously: repeatedly cover all AOIs in ROIs B and D.
• Spot SAR in two ROIs Simultaneously: repeatedly cover 4kmx4km areas, oriented N/S at the center of each AOI for ROIs B and D.

MultiMode scenario: coverage against ROI B (enlarged view at Figure 1.3.). TPMs for this multitarget, multimode assessment should also include percent of subtasks completed. This scenario should be conducted with and without a communication constraint of three degrees grazing angle to the direct downlink station shown in Figure 1.3. For the purposes of this scenario, all areas are defined as centered on the specific target point and oriented north and south.

This scenario represents an operational strategy which concurrently pursues each of the following tasks:

• HRR-GMTI Wide Area Search coverage of 170X170 km about AOI numbers 1 and 9 (as indicated on Figure 1.3) every 40 minutes. The objective is to detect large scale operations.
• HRR-GMTI Target Acquisition coverage:
  • 170X170 km areas at AOI #’s 2, 4, 5, 7, 10 and 12. The objective is to detect, classify and nominate for tracking high value targets (HVTs) or potentially significant formations. Tracks of interest occur in random directions, at random speeds, from 5-100 km/hr, and at random times each two hours in each AOI for a random time of travel between 5 and 10 minutes.
  • 4X4 km areas centered on AOI locations 3, 6, 8 and 11. HVTs depart the center of each AOI randomly during each 8 hours, in random directions and at random speeds from 5-100 km/hr for random times of travel between 5 and 10 minutes. The objective of these operations is to repetitively monitor known locations for the departure of HVTs, with the subsequent nomination of these moving vehicles for persistent track operations
• Persistent HRR-GMTI track operations against moving vehicles that have been nominated for tracking. In addition to the track nominations associated with HRR-GMTI acquisition mode operations, additional random tracks occur throughout the ROI in random directions, at random speeds from 5-100 km/hr and at random times each hour. These ROI wide nominations can be considered the result of cross cueing from TBM launch detections, SIGINT systems or other theater assets. The objectives of these operations are to provide complete tracking of all nominated targets. Key TPMs include PCAFOM and PFa per unit time (pre-exploitation) for 10 dBsm targets traveling at speeds of 5-100 km/hr (off-road), and 25-100 km/hr (on-road), and revisit interval statistics for each AOI.
• Spot SAR coverage of 4X4 kms targets at the center of each AOI every two hours. Excess constellation time over ROI B is to be utilized for further spot SAR operations at the center of each AOI.

Global Port Watch Scenario: This scenario is intended to be run in a stand alone mode, not connected to other cases/scenarios. The objective of this scenario is to perform port watch operations over 20X20 km areas at each port shown on the map at Figure 1.4 and in Table 1.4 (provided under separate cover). For purposes of this scenario assume the specified areas are all over water. Targets of interest include 25 dBsm ships moving at 10 knots and 10 dBsm boats moving at 30 knots. TPMs include PFa at a PD of .9 for each class of ships, revisit interval statistics for each port and satellite operating time statistics. Target density is assumed to be 1 per square km.

Single Area DTED Cases: Separate assessment of collection at each DTED level against single target areas, at 0 degrees longitude and 0, 20, 40 and 60 degrees north latitude. Detailed descriptions of the SIs concept for DTED collection operations is to be included. The TPMs for these cases is the time required to collect DTED level 3, over 300X300 km, DTED level 4 over 150X150 km and DTED level 5 over 90X90 km.