| Citation: | ZENG Chan, LI Weimin, BI Boet al. Simulation realization of high dynamic GPS signal coarse acquisition and fine acquisition algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(4): 790-799. doi: 10.13700/j.bh.1001-5965.2016.0313(in Chinese)
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For the purpose of solving GPS signal fast acquisition problem under the high dynamic, a coarse acquisition method combining improved partial matched filter (PMF) and fast Fourier transform (FFT) was proposed. The principle and structure of PMF+FFT were analyzed, and windowing of traditional method was put forward for the problems of scalloping loss and low acquisition performance. Since the high dynamic tracking method based on extended Kalman filter has a high requirement for the precision of the parameter after acquisition, a fine acquisition based on Chirp-Z transform (CZT) algorithm was proposed on the basis of coarse acquisition. Based on the theory model of GPS signal and high dynamic trail, this paper has realized digital intermediate frequency GPS signal of high dynamic. In order to further speed up the acquisition, a fast blind search method of combining pseudo code correlation was adopted for cold start. Finally through the MATLAB simulation experiments, it is verified that the proposed coarse and fine acquisition algorithm for high dynamic GPS signal can achieve the acquisition dynamic performance of 100
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