基于分段相关的GPS快速捕获系统设计

随着对接收机定位速度要求不断提高,接收机的捕获速度成为一个重要制约因素。针对捕获算法计算量大的问题,设计了一种基于分段相关和折叠差分匹配滤波器的捕获方法。它不但能将多普勒—码相位两维搜索变为码相位一维搜索,而且能大大减小计算量和降低资源消耗。进行了实验,实验结果表明该系统具有较强的捕获能力。

System Design of GPS Fast Acquisition Based on Segment Correlation

With the demand of higher locating speed in the GPS receiver,acquisition rate becomes an important constraint factor.According to the problem of large calculation for acquisition algorithm,an acquisition method is designed with segment correlation implemented in a differential folding matched filter.It not only makes two-dimensional search in Doppler-code phase into one-dimensional search in code phase,but also reduces the computation and resource consumption greatly.The acquisition system with this algorithm is implemented.Experimental results show that the system has strong acquisition ability.