Receiver Acquisition Algorithms and Their Comparisons for BOC Modulated Satellite Navigation Signal

Now days, the satellite navigation system such as GPS is used world widely for many applications which are growing fast creating need of satellite navigation. Regional satellite navigation systems are growing now which uses similar frequency as GPS so it creates the interference to GPS signal. The use of the Binary Offset Carrier (BOC) modulated signal in incoming satellite navigation systems can reduce this interference as it has low PSD at carrier frequency. In the receiver for satellite navigation system, the first main part is the acquisition which gives the coarse value of code phase and frequency to make the transmitter and receiver code align so to get data back so it is very important part of the satellite navigation receiver. The popular algorithms of the code phase and frequency acquisition for GPS like signals are serial search or time domain acquisition algorithm, parallel code phase search or FFT based algorithm, parallel frequency space search acquisition. The same algorithms can work for the BOC modulated satellite navigation signal by making a small change in them. Also to overcome the drawback of the parallel frequency space search acquisition, as a solution the squaring acquisition algorithm is described in this paper. In this paper, these algorithms are implemented and simulated by us in MATLAB for the BOC modulated satellite navigation signal and they are compared.