| 摘要: |
| 为了提高“北斗”系统的捕获性能，解决在弱信号环境中无法有效捕获与检到卫星信号的问题，在“北斗”系统的捕获方法中采用序贯检测的方式进行了改进与优化。分析后得出，序贯检测通过双门限与待检测区，使得样本数灵活可变，可以有效应对不同信噪比的信号，在强信号与弱信号下都有良好的效果。通过仿真对序贯检测方式与传统检测方式进行了性能上的比较与分析，结果表明，序贯检测逻辑不仅达到了传统检测方法中预期的检测概率和虚警概率，同时具备更高的性能与灵活性，强信号下缩短了捕获时间，提高了捕获效率；弱信号下提高了2~3 dB信噪比增益与捕获性能；既保证了该检测逻辑的可行性，又为捕获检测过程提供了一种思路与方法。 |
| 关键词: “北斗”卫星导航系统 信号捕获算法 序贯检测 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61801516) |
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| Application of sequential detection in BDS signal acquisition |
| SHAN Kun,SONG Xiaoou,LI Guobin |
| (Postgraduate Brigade,Engineering University of PAP,Xian 710086，China;School of Information Engineering,Engineering University of PAP,Xian 710086，China) |
| Abstract: |
| In order to improve the acquisition performance of Beidou Satellite Navigation System(BDS) and solve the problem that satellite signals cannot be captured and detected effectively in weak signal environment，the acquisition method of BDS is improved and optimized by sequential detection.After analysis,it is concluded that sequential detection makes the number of samples flexible and changeable through double thresholds and the area to be detected,which can effectively deal with signals with different signal-to-noise ratio(SNR),and has good results in strong and weak signals.The simulation results show that the sequential detection logic not only achieves the expected detection probability and false alarm probability of the traditional detection method,but also has higher performance and flexibility.The acquisition time is reduced and the acquisition efficiency is improved under strong signal,and 2~3 dB SNR gain and acquisition performance are improved under weak signal,which ensures the feasibility of the detection logic.It also provides an idea and method for the acquisition and detection process. |
| Key words: Beidou satellite navigation system(BDS) signal acquisition algorithm sequential detection |
