基于平均相关和差分相干累积的微弱GPS C/A码信号精密捕获算法

李新山; 郭伟

doi:10.11959/j.issn.1000-436x.2015092

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基于平均相关和差分相干累积的微弱GPS C/A码信号精密捕获算法

学术论文 | 更新时间：2024-06-05

- 基于平均相关和差分相干累积的微弱GPS C/A码信号精密捕获算法
- Fine C/A code acquisition algorithm for weak GPS signal based on averaging correlation and differential coherent accumulation
- 通信学报 2015年36卷第5期页码：112-119
- 作者机构：
  
  电子科技大学通信抗干扰技术国家级重点实验室，四川成都 611731
- 作者简介：
  
  [ "李新山（1972-），男，湖南涟源人，电子科技大学博士生，主要研究方向为微弱GPS信号接收、导航信号处理。" ]
  [ "郭伟（1964-），男，四川达州人，电子科技大学教授、博士生导师，主要研究方向为通信网络技术和无线移动通信技术等。" ]
- 基金信息：
  
  国家自然科学基金资助项目(61271168);国家高技术研究发展计划（“863”计划）基金资助项目(2014AA01A701);国防科技重点实验室基金资助项目(9140C020302130C02007)
- DOI：10.11959/j.issn.1000-436x.2015092
  中图分类号： TN965.5
- 网络出版日期：2015-05，
  
  纸质出版日期：2015-05-25
- 稿件说明：
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李新山, 郭伟. 基于平均相关和差分相干累积的微弱GPS C/A码信号精密捕获算法[J]. 通信学报, 2015,36(5):112-119.

IXin-shan L, UOWei G. Fine C/A code acquisition algorithm for weak GPS signal based on averaging correlation and differential coherent accumulation[J]. Journal on communications, 2015, 36(5): 112-119.
李新山, 郭伟. 基于平均相关和差分相干累积的微弱GPS C/A码信号精密捕获算法[J]. 通信学报, 2015,36(5):112-119. DOI： 10.11959/j.issn.1000-436x.2015092.

IXin-shan L, UOWei G. Fine C/A code acquisition algorithm for weak GPS signal based on averaging correlation and differential coherent accumulation[J]. Journal on communications, 2015, 36(5): 112-119. DOI： 10.11959/j.issn.1000-436x.2015092.

摘要

针对弱信号条件下GPS C/A码捕获问题，提出一种基于平均相关和差分相干累积的码捕获算法。首先，引入相干能量最大值与第二大值的比值作为判决变量，仿真了各种捕获算法的虚警概率得到最佳的判决门限；然后，通过设置的判决门限获得不同多普勒频率偏差及信噪比条件下的检测概率；最后，比较了所提差分相干累积算法、相干非相干累积算法以及非相干累积算法的捕获灵敏度。仿真实验表明，在相同接收数据长度的情况下，采用差分相干累积算法比其他2种算法提高捕获灵敏度约2 dB。

Abstract

Aiming at the problem of global positioning system (GPS) C/A code acquisition under weak signal conditions

a code acquisition algorithm based on averaging correlation and differential coherent accumulation was proposed.First

the strength ratio of the largest peak to the second largest peak was adopted as the decision variable; optimum decision thresholds can be obtained through the simulation probability of false alarm of all kinds of acquisition algorithms.Second

by setting the decision threshold

the probabilities of detection of different Doppler frequency deviation and signal to noise ratio (SNR) were obtained.Finally

acquisition sensitivities of the code acquisition algorithm based on the differen-tial coherent accumulation were compared with those of the code acquisition algorithm based on coherent and noncoher-ent accumulation and the code acquisition algorithm based on noncoherent accumulation.Simulation results show that acquisition sensitivities of the code acquisition algorithm based on the differential coherent accumulation are improved by about 2.0 dB than those of the other two acquisition algorithms under the same receiving data length condition.

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references

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