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Session B3: Military GPS User Equipment

First Flight Test of EGI with M-Code
Scott Leavy, Paisley Rowe, Michael Nelson, Honeywell
Date/Time: Wednesday, Aug. 25, 9:35 a.m.

Honeywell supported the Positioning, Navigation, and Timing (PNT) Assessment Exercise 2020 (PNTAX20) on October 31, November 2, and November 3 of 2021. The Honeywell testing was performed on board the Honeywell Embraer EMB-170 aircraft using a Honeywell SAASM EGI and a Honeywell Embedded Global Positioning System (GPS)/Inertial Navigation System (INS) (EGI) with M-Code. This was the first flight test of an airborne M-Code capable EGI. The purpose of the test was to collect test data for an EGI with M-code and a SAASM EGI to compare and contrast the performance during clear air and during the jamming threats, thereby demonstrating the capability of the embedded M-Code capability in the Honeywell EGI with M-code as compared to the currently fielded SAASM EGI. The Honeywell EMB-170 had the two palletized Honeywell EGIs installed with one antenna split between them. The EGI with M-code contained a US Government loaned Trimble Force 5M receiver. The SAASM EGI system contained a Trimble Force 524E SAASM receiver.
During each night the EGI with M-code was set for Y-code only, M-code only, and MY mode for a portion of each night so that Honeywell could compare Y-code performance between the two systems and then could also compare the M-code performance versus Y-code performance.
Honeywell is in the process of developing the M-Code based INS/GPS blended solution to support Automatic Dependent Surveillance-Broadcast (ADS-B) and to support phases of flight through Localizer Position with Vertical (LPV) to support a military based precision approach capability when a civil GPS based solution is not usable or not trusted. The EGI with M-code also supports an SBAS based blended solution that can also support ADS-B and also support phases of flight through LPV to support a civil air space precision approach capability. The solutions are selectable and give the military Warfighter full capability to complete missions whether they are civil or military in nature. Both solutions support computation and output of aircraft glideslope guidance information based on a supplied Final Approach Segment data block input to the EGI. With the addition of a resilient M-code based resilient solution it will allow such operations to occur even under threat.
The end goal of this technology is to provide improved GPS threat resilience for the Honeywell EGI product line allowing for better continuity of service and improved navigation performance to the Warfighter in the field. The results of this testing provide significant risk reduction for aircraft platforms that will be integrating and fielding M-code capable EGIs in the near term.



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