研究了弱信号条件下GPS软件接收机的C/A码的快速捕获问题。提出了一种高灵敏度快速捕获新算法，该方法首先采用平均相关技术降低C/A码的自相关损耗，基于载频误差补偿技术减小C/A码累积误差；然后利用叠加相关方法降低相干累积运算的复杂度，通过循环移位减小频率步进搜索的时间消耗。实验结果表明，该算法能够实现微弱GPS信号捕获，且运算量适中，捕获概率较高。

Aiming at the fast C/A code acquisition of GPS software receiver under weak signal conditions, a new fast acquisition algorithm with high sensitivity is proposed. Firstly, the autocorrelation loss and accumulative error of C/A codes are reduced respectively by using the average correlation technique and the carrier frequency error compensation technique. Then, the complexity of coherent cumulative operations is reduced by use of superposition correlation,and the time-consuming of frequency stepping search is decreased by cyclic shift.Experimental results show that the proposed algorithm can realize the acquisition of weak GPS signals, and has moderate computational complexity and high acquisition probability, which is suitable for the high-sensitivity software receiver.