Integration of full scale development aircraft GPS user equipment (AN/ARN-151) with Doppler radar systems

Tests of a full-scale development aircraft GPS (Global Positioning System) user equipment (AN/ARN-151) Receiver-3A integrated with a simulated DRS (Doppler radar system) via a mission computer MIL-STD-1553B bus were performed. Test conditions were particularized to an SH-60F platform as a baseline; specific test conclusions should not be generalized to embedded GPS/DRS suites or other GPS/DRS integrations. The simulation results indicate that overall benefits in the areas of satellite acquisition/reacquisition, antijamming performance, and performance during degraded satellite availability accrue when the Receiver-3A is integrated with the Doppler system. Without Doppler aiding, the Receiver-3A under conditions of jamming-to-signal ratios greater than 42 dB or under conditions of two or less satellite availability would potentially have an unbounded position error growth. With Doppler aiding, the acquisition/reacquisition process is improved, the antijamming margin is increased by at least 10 dB, and position error growth is always bounded by (at worst) Doppler position error growth