Measuring Interchannel Bias in GPS Receivers

Greg Johnson and Thomas Zaugg

Abstract:	Interchannel bias is the correlated error that is caused by internal GPS receiver processes. This may include filter performance, tracking loop biases and/or channel path lengths. Interchannel bias cannot be measured with live data because large errors in the GPS measurements make it impossible to measure the much smaller interchannel bias. The only way to measure interchannel bias is to zero out all other channel errors. This can be done by using a GPS simulator. However, the GPS simulator may also have interchannel biases. This paper will show a method to measure interchannel bias in receivers by first assuming that the simulator itself has no interchannel bias. The amount of simulator interchannel bias, if any, can be comparatively measured.
Published in:	Proceedings of the 57th Annual Meeting of The Institute of Navigation (2001) June 11 - 13, 2001 Albuquerque, NM
Pages:	477 - 480
Cite this article:	Johnson, Greg, Zaugg, Thomas, "Measuring Interchannel Bias in GPS Receivers," Proceedings of the 57th Annual Meeting of The Institute of Navigation (2001), Albuquerque, NM, June 2001, pp. 477-480.
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