一种高灵敏度GPS信号捕获算法  

High-Sensitivity Acquisition Algorithm for GPS Signal

作　　者：莫凡[1] 王新龙[1] 

机构地区：[1]北京航空航天大学宇航学院,北京100191

出　　处：《航空兵器》2013年第3期13-17,共5页Aero Weaponry

基　　金：国家自然科学基金(61074157);卫星应用研究院创新基金项目(2012-1517);航空科学基金(20090151004)支持项目

摘　　要：为了提高GPS软件接收机在低信噪比环境下的捕获能力,提出了一种高灵敏度GPS信号捕获算法。将相干累积和差分相干累积算法有效结合,消除了平方损耗的影响,显著提高了信噪比;同时利用并行码相位算法减小了运算量,实现了快速高灵敏度GPS信号捕获。仿真结果和实际测试表明,新算法对于微弱环境下的GPS信号捕获能力强,处理增益高。In order to improve the ability of capture of GPS software receiver in the low SNR environments, an approach which combines coherent integration and differentially coherent integration algorithm effectively is provided. This algorithm eliminates square loss effectively and improves SNR remarkably. Meanwhile the parallel code phase search acquisition algorithm is used to reduce the amount of computation, and achieves high sensitivity acquisition. The simulation and experimental results show that the new acquisition algorithm provides stronger capacity of acquainting signal and higher processing gain in the weak environments.

关 键 词：高灵敏度捕获 GPS信号 差分相干 并行码相位 

分 类 号：TJ765[兵器科学与技术—武器系统与运用工程] TN965.5[电子电信—信号与信息处理]