GPS C/A-Code Interference Tests with Proposed Lm Waveforms

Joseph L. Leva, Peter Pacheco

Abstract:	The Global Positioning System (GPS) has become a critical sensor for military and civilian applications. In response to increased demand for both military and civilian capabilities, the GPS Joint Program Office is undertaking an effort to design the next generation GPS signal architecture. Most important among the many requirements are the addition of a second civil frequency and a more jam-resistant military (Lm) waveform. Frequency allocation issues make frequency reuse potentially attractive whereby L1 and L2 would be modified to include a combination of P(Y), C/A, and Lm waveforms. Several Lm waveforms have been proposed with Manchester Coding and Offset Carrier the two strongest candidates. Regardless of the waveform chosen, the introduction of an Lm signal must be backward compatible with current civilian GPS receivers. This paper presents results of civilian receiver tests in the presence of a Manchester or Offset Carrier Lm signal. Several civilian receivers are tested. Results quantify degradation in receiver measured C/N0 and effects on receiver accuracy as a function of Lm transmit power. Study results indicate that frequency reuse of the current GPS bands has potential for satisfying both civilian and military requirements.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	809 - 818
Cite this article:	Leva, Joseph L., Pacheco, Peter, "GPS C/A-Code Interference Tests with Proposed Lm Waveforms," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 809-818.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In