A novel correlation architecture of acquisition for GNSS satellite navigation system receiver based on CORDIC algorithm

Acquisition is the key function modules of the baseband system of satellite navigation receiver. In the GNSS receiver for GPS, GLONASS and Beidou, in order to acquire the three navigation signals at different chip rates and frequency, three FFT processors are needed when using the parallel search based on FFT. GNSS receiver can choose best navigation system according to the signal strength of different system. Under this background, a novel correlation architecture based on CORDIC algorithm is proposed in this paper. Based on the CORDIC architecture, one common acquisition module configured by different parameters for arbitrary system in the GNSS navigation baseband system is built. While in this architecture, the twiddle multiplications are performed by CORDIC-based multipliers, avoids the hardware multiplier which always occupies a lot of hardware resource. The experiment results show that the proposed correlation architecture can greatly reduce the power, hardware resource and consumption while keeping the fast acquisition. It is attractive for the GNSS navigation receivers.