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AN/SSN-6(V)2 Navigation Sensor System Interface System

The AN/SSN-6 Navigation Sensor System Interface (NAVSSI) System is an integrated shipboard system that automatically accepts, processes, and disseminates navigation and time information from various shipboard navigation sources. The AN/SSN-6 provides a means for users to obtain data verification, digital mapping, and the programming of selected way points.

The AN/SSN-6 utilizes inputs from the Inertial Navigation System (INS), AN/UQN-4 Sonar Sounding Set, and EM Log to provide extremely accurate position (latitude and longitude), velocities (N-S, E-W, and vertical), ownship heading (OSH), roll, pitch, depth below keel, speed through the water (OSS), own ships distance (OSD), and extremely accurate time. The AN/SSN-6 also receives GPS satellite data via two embedded GPS VME Receiver Cards (GVRC).

The inputs to the AN/SSN-6 are processed, and in the AUTO mode, NAVSSI selects the best source selection for each output component. In the manual mode, the source selection is made by the operator to provide the appropriate output.

The AN/SSN-6 is composed of three units: the Display Control Subsystem (DCS), the Real Time Subsystem (RTS), and the Bridge Work Station (BWS). The DCS provides overall system control, data processing, data storage, and Man-Machine Interface (MMI) for both operation and maintenance. The DCS also houses the Sensor Interface Unit (SIU) for processing depth below the keel sonar signals from the AN/UQN-4. The DCS monitor can be utilized as a backup to the BWS. The RTS is the primary means for communicating between the various sensors to obtain inputs for the AN/SSN-6 and to provide usable output information to various ships systems. The BWS provides parallel operator control, query, and readout of the DCS.

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