Positioning with Mixed Signals of Opportunity

Chun Yang, Thao Nguyen, Di Qiu, Jared Casper, and Morgan Quigley

Abstract:	In GPS-challenged environments, signals of opportunity (SOOP) can be exploited to ensure a graceful degradation of navigation solution with smoothing transition and continuity. In this paper, we present our effort in developing a testbed for positioning with mixed signals of opportunity. The testbed consists of a multi-channel software-defined radio and associated software receivers. Driven by an oven-controlled crystal oscillator (OCXO), the software-defined radio can be tuned independently to seven different frequency bands and down-convert the RF signals to the baseband coherently for analog to digital conversion (ADC). More critically, the sampling of seven channels is synchronized. The testbed has been used to successfully acquire and track GPS, DTV, GSM, and CDMA2000 (1X RTT) signals. The paper describes the hardware and software design features and presents the initial processing results of code and carrier phase and frequency measurements as well as their equivalent ranging accuracy, which is the basis for positioning as part of our ongoing effort.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	447 - 456
Cite this article:	Yang, Chun, Nguyen, Thao, Qiu, Di, Casper, Jared, Quigley, Morgan, "Positioning with Mixed Signals of Opportunity," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 447-456.
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