基于CIC抽取滤波器结合串并行的搜索捕获算法

Based on CIC Extraction Filter Combination of Serial and Parallel Search Capture Algorithm

GPS信号的捕获是GPS接收机的重要环节,其中串行搜索算法,并行码相位算法是GPS信号捕获的常用方法。但随着GPS接收机覆盖我们的生活,对捕获算法的速度要求也就越来越高。提出了一种新的捕获方法,基于CIC抽取滤波器并结合串并行搜索的算法,这种捕获方法在抽取阶段使用CIC滤波器降低频谱混叠的影响,然后在使用并行码相位搜索算法的基础上加入了串行搜索的部分,从而减少了计算量,提高了运算速度。对算法进了仿真,实验结果证明了该方法的有效性和优越性。最后对运算优势进行了分析。

GPS signal capture is an important part of the GPS receiver,and serial search algorithm,parallel code phase algorithm are the useful methods of GPS signal capture.But as the GPS receiver covers our life,the requirement on the speed of the capture algorithm is higher and higher.This paper puts forward a new capture method,based on the CIC extraction filter and the combination of serial-parallel search algorithm.This acquisition method uses CIC filter to reduce the impact of aliasing in the extraction phase.And serial search are added in the capture method on the basis of the parallel code phase search algorithm.thereby reducing the amount of calculation and improving the operation speed.In this paper,the algorithm is simulated,and the experimental results show the effectiveness and superiority of this method.Finally,the operation advantages are analyzed.