一种改进双块补零北斗导航接收机弱信号捕获方法

doi:10.7527/S1000-6893.2016.0297

电子电气工程与控制

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一种改进双块补零北斗导航接收机弱信号捕获方法

孟骞^1,2, 刘建业^1,2, 曾庆化^1,2, 冯绍军³, 李荣冰^1,2

1. 南京航空航天大学导航研究中心, 南京 210016;
2. 卫星通信与导航协同创新中心, 南京 210016;
3. 帝国理工学院交通研究中心, 伦敦 SW7 2AZ

收稿日期:2016-10-10 修回日期:2016-10-28 出版日期:2017-08-15 发布日期:2016-11-21
通讯作者: 刘建业,E-mail:ljyac@nuaa.edu.cn E-mail:ljyac@nuaa.edu.cn
基金资助:
国家自然科学基金（61533008，61374115，61328301）；中央高校基本科研业务费专项资金（NS2015037）；江苏省普通高校学术学位研究生科研创新计划（KYLX16-0379）；国家留学基金；英国帝国理工学院交通研究中心资助

BeiDou navigation receiver weak signal acquisition aided by block improved DBZP

MENG Qian^1,2, LIU Jianye^1,2, ZENG Qinghua^1,2, FENG Shaojun³, LI Rongbing^1,2

1. Navigation Research Center, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Satellite Communication and Navigation Collaborative Innovation Center, Nanjing 210016, China;
3. Centre for Transport Studies, Imperial College London, London, SW7 2AZ, UK

Received:2016-10-10 Revised:2016-10-28 Online:2017-08-15 Published:2016-11-21
Supported by:
National Natural Science Foundation of China (61533008,61374115,61328301);the Fundamental Research Funds for Central Universities (NS2015037);the Funding of Jiangsu Innovation Program for Graduate Education (KYLX16-0379);China Scholarship Council;Centre for Transport Studies in Imperial College London

摘要/Abstract

摘要：

利用卫星导航系统对高轨航天器进行自主导航与高精度定轨，对接收机的捕获灵敏度要求极高，双块补零（DBZP）算法是无辅助下卫星导航弱信号捕获的理想方案，然而受限于数据处理量大，DBZP实际应用难度大。在深入分析双块补零机理的基础上，结合矩阵重构的思想，提出了一种改进双块补零北斗导航接收机弱信号捕获方法。该方法对参与块内相关运算的基带信号和本地测距码分别进行重构，解决了块内点数与快速傅里叶变换输入点数之间的矛盾，提高了北斗导航接收机弱信号捕获性能。仿真实验结果分析表明，改进双块补零算法对信噪比没有损失，可以保证对低至15 dB·Hz的弱信号进行有效捕获，能够满足高轨航天器定轨、室内外无缝导航等对接收机高灵敏度的需求。本方法是在块内运算层面对DBZP进行优化，具备良好的通用性和可移植性，与优化相干积分策略的各种改进DBZP算法可以无缝对接，进一步提高北斗导航接收机信号处理的效能。同时，重构的思想也适用于其他采用码分多址信号的卫星导航系统的弱信号检测和捕获，对提升多星座卫星导航系统的基带信号处理性能具有参考意义。

关键词: 全球导航卫星系统, 自主导航, 信号捕获, 快速傅里叶变换, 块内重构

Abstract:

The high altitude spacecraft autonomous navigation and orbit determination technology based on the global navigation satellite system has higher requirements for the acquisition sensitivity of the receiver. Double block zero padding (DBZP) method is an ideal solution for unaided satellite navigation receiver weak signal acquisition. But the classical DBZP has low engineering value to create barriers for its popularization and application. With the help of matrix reconfiguration,a new BeiDou weak signal acquisition method aided by block improved DBZP is proposed based on the analysis of the function realization mechanism. The baseband signal and local pseudo-random code are reconfigurated to solve the contradiction between the block points and fast Fourier transform input points, greatly improving the efficiency of weak signal acquisition. Performance analysis and simulation results show that the proposed method can realize the signal acquisition low to 15 dB·Hz effectively without any loss of SNR, which can meet the requirement for high receiver sensitivity in high-altitude spacecraft orbit determination, and indoor and outdoor seamless navigation. The proposed method is the optimization on the level of DBZP block operation, and can seamlessly integrate with the other improved DBZP methods focusing on optimization of coherent integration scheme. The proposed method is thus of universal applicability and transplantability. Meanwhile, the idea of reconfiguration can be applied to any other global ravigation satellite system signal detection and acquisition based on code division multiple access, and can provide some reference to baseband signal processing of multi constellation navigation receiver.

Key words: global navigation satellite system, autonomous navigation, signal acquisition, fast Fourier transform, block reconfiguration

中图分类号:

V249.32+4

孟骞, 刘建业, 曾庆化, 冯绍军, 李荣冰. 一种改进双块补零北斗导航接收机弱信号捕获方法[J]. 航空学报, 2017, 38(8): 320833-320833.

MENG Qian, LIU Jianye, ZENG Qinghua, FENG Shaojun, LI Rongbing. BeiDou navigation receiver weak signal acquisition aided by block improved DBZP[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(8): 320833-320833.

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

一种改进双块补零北斗导航接收机弱信号捕获方法

BeiDou navigation receiver weak signal acquisition aided by block improved DBZP

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