Performance Analysis of a USRP Based GPS and GLONASS Signal Recording and Playback System

Ruihui Di, Yu Morton and Eric Vinande

Abstract:	This paper presents performance evaluation and analysis of a Multi-GNSS signal recording and playback system based on Universal Serial Radio Peripheral (USRP) family of devices. Two USRP-N210 mother boards are paired with appropriate RFX daughter boards to record and playback Multi-GNSS signals controlled by a personal computer. An adjustable signal attenuator mounted between the playback USRP output and the transmitting antenna controls the transmitted power of the signal. The two USRPs are synchronized by an external reference clock. The recorded and playback signals are processed for GPS L1, L2C, and L5, and GLONASS L1 and L2 signals. The carrier to noise ratio and carrier phase noise are computed for each recorded and playback signal using the same software receiver acquisition and tracking algorithm for the playback system performance evaluations. A 6th order Butterworth Filter is used to remove the low frequency components of carrier tracking measurements. The OCXO reference clock performance is also compared with that of a TCXO to demonstrate the importance of having a quality oscillator for the recording and playback system.
Published in:	Proceedings of the 2013 International Technical Meeting of The Institute of Navigation January 29 - 27, 2013 Catamaran Resort Hotel San Diego, California
Pages:	136 - 145
Cite this article:	Di, Ruihui, Morton, Yu, Vinande, Eric, "Performance Analysis of a USRP Based GPS and GLONASS Signal Recording and Playback System," Proceedings of the 2013 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2013, pp. 136-145.
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