新的微弱GPS信号快速捕获算法

新的微弱GPS信号快速捕获算法
郭利超;廉保旺;马朝霞
【期刊名称】《现代电子技术》
【年(卷),期】2011(34)15
【摘要】The fast effective C/A code acquisition algorithm for weak signal has an important position in the high-sensitivity GPS receiver, and is also a key for the practical application of the high-sensitivity GPS receiver. According to the statistical characteristic analysis of the acquired signal relative amplitude values, this paper shows the primary cause that is difficult to acquire the weak GPS signal. The main advantages and disadvantages of the current data accumulation are discussed. Based on the analyses of GPS system and the navigation data format, a weak GPS signal acquisitionalgorithm is put forward in combination with the fast coherent accumulation and satellite position prediction. Theoretical analysis and simulation results show that the algorithm is feasible and can catch the satellite signal when SNR is equal to -43 dB. Field testing data indicates that the new algorithm can remarkably improve the ability to acquire more satellite signals.%弱信号环境下快速有效的C/A码捕获算法,在高灵敏度GPS接收机中占据着重要地位,同时也是高灵敏度GPS接收机实用化的关键.通过对捕获信号相关幅值的统计特性分析,从理论上揭示了微弱GPS信号难于捕获的根本原因,并论述了当前主要的数据累积方法的利弊.通过对GPS系统和导航电文格式的分析,将快速相干累积与卫星位置预测相结合提出了新的GPS微弱信号捕
获算法.理论分析和仿真结果表明了本算法的可行性,在信噪比SNR为-43 dB时可以稳定地捕获GPS信号.使用实际数据测试表明,该算法能明显增加捕获到的卫星数量.
【总页数】5页(P74-78)
【作者】郭利超;廉保旺;马朝霞
【作者单位】西北工业大学电子信息学院,陕西西安710129;太原卫星发射中心,山西太原036300;西北工业大学电子信息学院,陕西西安710129;太原卫星发射中心,山西太原036300
【正文语种】中文
【中图分类】TN911-34
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