HIL Testing of the Navy LEAP GPS/INS Package

George Stupp and David Lehnus

Abstract:	As part of the Navy Lightweight Exo-Atmospheric Projectile (LEAP) Technology Demonstration program, a new interceptor based on STANDARD Missile and a shipboard weapon system was built to demonstrate the potential of integrating the required technologies to defend against tactical ballistic missiles. Incoming tactical missiles would be engaged in outer space (prior to atmospheric reentry) with a Kinetic Kill Vehicle (KKV). Accurate knowledge of interceptor attitude as well as position and velocity is critical to pointing the KKV at the target. The LEAP system used an integrated GPS/INS package to provide this data. The mission contained both high acceleration and high velocity while demanding high accuracy attitude estimates at the end of the short flight. The paper describes hardware-in-the-loop (HIL) testing done on the LEAP GPWINS package using JHU/APL’s NAVSIL laboratory. The test configuration presented a detailed simulated flight environment to the GPS/INS through both simulated GPS RF and simulated inertial sensor signals. Multiple flight trajectories were generated by a high fidelity 6- DOF all-digital interceptor simulation. Detailed effects in the HIL simulation included inertial instrument errors, GPS antenna pattern signal level effects, and acceleration induced GPS receiver reference oscillator shift. The resulting high fidelity HIL testing capability provided important support to development of the GPS/INS package and an independent assessment of expected GPYINS performance. Overall mission success was predicted by inserting measured HIL GPYINS errors into the 6-DOF LEAP mission simulation.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1713 - 1719
Cite this article:	Stupp, George, Lehnus, David, "HIL Testing of the Navy LEAP GPS/INS Package," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1713-1719.
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