A Single Acquisition Channel Receiver for GPS L1CA and L2C Signals Based on Orthogonal Signal Processing

Al-Aboodi, Maher and Lami, Ihsan and Albu-Rghaif, Ali and Van Tor, Patrick and Rogier, Hendrik (2015) A Single Acquisition Channel Receiver for GPS L1CA and L2C Signals Based on Orthogonal Signal Processing. In: ION GNSS+ 2015, 14-18 Sep. 2015. (Submitted)

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Abstract

The GPS L1CA and L2C signals are transmitted from the same GPS Satellite Vehicles constellation. It is desirable, especially in commercial GNSS receivers, to have both of these signals acquired by a single receiver so to assure better signal acquisition and improved reliability at wider operating areas. To achieve this in an efficient process, we propose to integrate the GPS L1CA and L2CM signals orthogonally and acquire them in a single processing channel. After removing the Doppler frequency, our receiver first adds the quadrature components of the L2CM signal and the L1CA signal. This new signal is then shifted by 90o. This is then added to the remaining components of these two signals; thus resulting in an orthogonal form of the combined signals. Secondly, the FFT of this orthogonal signal is then mixed with the complex conjugate of the FFT of a locally generated replica of the CA code combined with a 90o-shifted replica of the CM code. Finally, the output signal is then converted back to the time domain to acquire the signal’s peak. The complexity of our dual-signal receiver implementation is half of that used in dual acquisition methods. Furthermore, MATLAB Simulation results show that our acquisition method compares favorably with other approaches in terms of detection of low sensitivity signals and false alarm probability.

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