为提高全球定位系统(GPS)软件接收机的精捕获速度和精度,提出了一种改进正交搜索优化的GPS信号精捕获方法。首先,利用GPS信号相关捕获结果去除码相位,并构建备选函数集;然后,基于信号级数分解理论,采用正交搜索实现信号精捕获,并改进了正交搜索方法,采用迭代搜索策略提高捕获速度。理论分析和实验结果表明,该方法具有较高的GPS信号精捕获频率估计精度,且精捕获收敛速度很快,能够有效降低GPS设备的资源消耗。

In order to improve the acquisition speed and accuracy of global positioning system (GPS) software receiver, an improved orthogonal search precise acquisition method is proposed. Firstly, the correlation acquisition results of GPS signals are used to remove the code phase, and an alternative set of functions is constructed. Then, based on signal decomposition theory, the precise acquisition of signals is realized by orthogonal search. The orthogonal search method is improved, and the iterative search strategy is adopted to improve the acquisition speed. The theoretical analysis and experimental results show that this method can achieve high precision estimation of precise acquisition frequency of GPS signal, and the convergence speed of precise acquisition is very fast, which can effectively reduce the resource consumption of GPS equipment.