GPS信号快速高精度捕获算法

针对GPS信号精捕获存在的捕获速度和精度间矛盾的问题, 提出基于正交搜索的GPS信号精捕获算法。算法首先根据GPS信号粗捕获结果去除码相位, 然后根据粗捕获结果和分辨率构造一组非正交的正弦备选函数, 并采用Gram-Schmidt正交化方法实现频率精捕获。算法鲁棒性较强, 计算简单、易于实现。实验结果表明, 所提算法频率捕获性能优于目前普遍采用的补零FFT方法, 频率捕获精度较高, 收敛速度较快, 很好地平衡了捕获速度与捕获精度之间的矛盾, 适用于当前移动导航定位设备应用场合。

Abstract

Aiming at the contradiction between the capture speed and the capture accuracy of fine acquisition of GPS signal, a GPS fine signal acquisition method based on orthogonal search is proposed. The code phase is firstly removed according to the coarse acquisition result of the GPS signal, and then a set of non-orthogonal sinusoidal candidate functions is constructed according to the coarse capture result of the frequency and the coarse capture resolution. Finally, Gram-Schmidt orthogonalization method is used to achieve the fine acquisition of frequency. Experimental results show that the frequency acquisition performance of the proposed method is better than that of the commonly used zero-filled FFT method, which balances the contradiction between capture speed and capture accuracy and is suitable for current mobile navigation and positioning equipment applications.

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胡品端, 杨久东. GPS信号快速高精度捕获算法[J]. 电光与控制, 2019, 26(9): 34. HU Pinduan, YANG Jiudong. Fast and High-Precision Acquisition of GPS Signals[J]. Electronics Optics & Control, 2019, 26(9): 34.

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