高动态及微弱信号环境下GPS信号捕获方法  

Acquisition Method for GPS Signals under Weak or Highly Dynamic Condition

作　　者：胡琼[1] 茅旭初[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《计算机仿真》2011年第11期103-106,共4页Computer Simulation

摘　　要：研究优化导航信号精确性问题,由于信号在传输过程中有损耗,传统捕获GPS信号的方法都是采用执行相干积分和非相干积分,但是非相干积分会带来非相干积分损耗,降低了接收机的灵敏度,不利于微弱信号的捕获。为了提高信号捕获精度和概率,提出一种FFT的GPS信号最佳数据组合捕获算法,并给出了算法的理论依据和具体捕获的流程。经仿真证明,算法能提高接收机的灵敏度,并且能有效提高信号的检测概率,表明了新提出算法的有效性。Traditional methods implement coherent and non-coherent integration to acquire GPS signal.In the non-coherent integration process,because of non-coherent loss,the receiver sensitivity is reduced and it is difficult to acquire weak signals.A new FFT-based acquisition algorithm of optimum combination data of GPS signals was proposed.The theory and acquisition process were given.The algorithm can improve the receiver sensitivity and the probability of detecting GPS signals.Compared with traditional method,the experimental results show the advantage of the new method.

关 键 词：全球定位系统 最佳数据组合 微弱信号 高动态 捕获 

分 类 号：TN967.1[电子电信—信号与信息处理]