Anechoic Chamber Testing of M-Code Interference with Legacy Military Receivers

摘要

One of the primary goals of GPS Modernization is to implement an advanced signal capability while maintaining backward compatibility with legacy military and civil User Equipment (UE). The new military-unique code (M-code), anticipated for on-orbit transmission in 2004, implements enhanced security, utility, accuracy, and flexible power (Flex Power) capabilities. Prior to activating this new signal, Department of Defense (DoD) leadership is interested in measuring the effects of Mcode on current UE. The Air Force Operational Test and Evaluation Center (AFOTEC) and the Navstar GPS Joint Program Office (JPO) have teamed up in a combined developmental test/operational test (DT/OT) to investigate the effects of M-code on fielded UE. Results indicate that performance of military and civilian receivers are not affected by the presence of modernized signals. During the period 9-21 June 2003, the Navstar GPS JPO and AFOTEC conducted backward compatibility testing of current GPS receiver/antenna combinations in the presence of modernized signals. The testing was accomplished at the Patuxent River Naval Air Station (Pax River NAS) Anechoic Chamber in Maryland. Full interplex modulation was implemented, and Flex-