An inertial information assisted acquisition algorithm of modernized navigation signal

High dynamic and weak signal are the difficult aspects of satellite navigation signal acquisition. After the pilot channel is added to the modernized navigation signal, the coherence integral time can be prolonged to improve the acquisition sensitivity, but it is also restrained by the rapid change of carrier doppler which is caused by the high dynamic of receiver. For this problem, a quantitative analysis of the reduction of acquisition search range which is the effort of inertial information aiding will be made firstly. Secondly, a new modernized data/pilot joint acquisition algorithm which is aided by inertial information and a pilot single channel acquisition algorithm will be proposed. Simulation results show that the proposed algorithms can effectively resist the energy decay caused by the rapid change of doppler frequency, improve the sensitivity, reduce the computational complexity and enhance the acquisition ability of high dynamic and weak signals.