Testing the Effects of M-Code on GPS Timing Receivers

J. Brad, I. Galysh, D. Koch, J. White, P. Landis

Abstract:	The Naval Research Laboratory has measured the effects of several modulation schemes proposed for use as the new Global Positioning System (GPS) M-Code on the operation of existing GPS timing receivers. Three candidate codes were tested at varying power levels to quantify the effects of the new signal added to a traditional GPS signal generated by a IO-channel GPS signal simulator. The M-Codes were generated in hardware to make representative Binary Offset Carrier and Manchester waveforms. Because the new codes may be run at considerably higher power levels than the current C/A and Y code signals, the M-Code signals were added in at power levels up to 40 dB over the existing signals. The test results show that the presence of M-Code signals is detectable. The effects on noise in the pseudorange and timing outputs are small.
Published in:	Proceedings of the 31th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 1999 Marriott's Laguna Cliffs Resort Dana Point, California
Pages:	365 - 372
Cite this article:	Brad, J., Galysh, I., Koch, D., White, J., Landis, P., "Testing the Effects of M-Code on GPS Timing Receivers," Proceedings of the 31th Annual Precise Time and Time Interval Systems and Applications Meeting, Dana Point, California, December 1999, pp. 365-372.
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