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Session C8: Military GPS User Equipment and Related Programs 3

Rapid M Code Receivers Integration in Legacy Systems
Farzin Dinyarian, Omid Haghighi, Mario Valdez, Christopher Pham, Rajan Paul, Angie Sy, Jeffrey Cronk and Brian Fly, Northrop Grumman
Location: Ballroom B
Date/Time: Tuesday, Jun. 2, 5:05 p.m.

Northrop?Grumman?Systems?Corporation (NGSC) has recently integrated and qualified two different?M code receivers to replace the SAASM (Selective Availability, Anti Spoofing Module) receiver in the LN 251 advanced airborne INS/GPS (EGI) and the LN 270 land navigator variant. Each of these receivers presented its own specific integration challenges, performance characteristics, and behavior that had to be overcome in order to achieve backward compatibility for existing legacy products. The backward compatibility requirement permits no mechanical, electrical, or digital interface differences, and no software or system level capability or performance degradation constraints that made rapid development more challenging.
These two EGI systems are self contained, worldwide, strapdown inertial navigation systems that include an embedded 24 channel, all in view M Code Global Positioning System (GPS) receiver. They provide three independent, simultaneous navigation solutions—INS only, GPS only, and blended (GPS/INS)—and support both stationary and moving base alignment. The systems supply position, navigation, and time data to other vehicle subsystems for flight and mission critical functions. External communication interfaces comprise two dual redundant MIL STD 1553 data buses, two Gigabit Ethernet data buses, configurable RS 422/RS 485 ports, and up to six ARINC 429 channels.

This presentation will focus on the technical aspects of integrating both M code receivers and is organized into three main sections. The first section will discuss the trade off and feasibility study for receiver selection. The second section will cover hardware and software integration with legacy systems, ensuring 100?% backward compatibility in capability and performance. The final section will present test and performance results obtained in laboratory and dynamic environments. This presentation will provide a breakthrough in the demonstration of an M-code GPS receiver integrated into a legacy EGI system, tested under real dynamics and the list of practical lessons from these integrations.

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