Abstract:

In view of the signal dynamic characteristics and working mechanism of inter-satellite links in navigation constellation, an adaptive acquisition algorithm assisted by the navigation data is introduced. The proposed method makes use of the navigation data to calculate the time-delay, Doppler frequency and signal to noise ratio of the received signal. Based on the results, the search area, non-coherent times and threshold of signal acquisition are adjusted adaptively to reduce acquisition time while improving acquisition performance. Finally, the effectiveness of the proposed algorithm is proved by the real orbit data of the global positioning system.