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一种改进的“北斗”卫星信号捕获方法
覃新贤,齐月敏
0
((广西大学 a.计算机与电子信息学院;b.广西多媒体通信与网络技术重点实验室,南宁 530004;(广西大学 计算机与电子信息学院;,南宁 530004)
摘要:
针对Neumann-Hoffman(NH)码跳变影响“北斗”卫星捕获灵敏度的问题,提出了一种改进的相干累积算法。通过遍历连续信号的码元的组成,找出大于门限的相关值,减少NH码跳变对信号累加的影响。仿真结果表明,改进的相干累积算法可以有效提高弱信号的捕获成功率。与传统的相干累积算法相比,延长了累积长度;与非相干累积算法相比,捕获灵敏度提高了2~3 dB。同时,采用先累加后相关的方法,有效降低了算法复杂度。
关键词:  “北斗”卫星  弱信号捕获  相干累积  NH码跳变
DOI:
基金项目:国家自然科学基金资助项目(61563004)
An improved acquisition method for Beidou satellite signals
QIN Xinxian,QI Yuemin
(a.School of Computer,Electronics and Information;b.Guangxi Key Laboratory of Multimedia Communications and Network Technology,Guangxi University,Nanning 530004,China;School of Computer,Electronics and Information,Guangxi University,Nanning 530004,China)
Abstract:
For the problem of Beidou Navigation Satellite Systems(BDS) acquisition sensitivity caused by the jump of Neumann-Hoffman(NH) code,an improved coherent accumulation algorithm is proposed.By traversing the composition of code of successive signals,the correlation values greater than the threshold can be found,which can reduce the influence of bit-flipping.The simulation results show that the improved coherent cumulative algorithm can effectively improve the rate of capture success of weak signal.Compared with the traditional coherent accumulation algorithm,the proposed algorithm can prolong the accumulated time.Compared with the non-coherent accumulation algorithm,the proposed algorithm improves the acquisition sensitivity by 2~3 dB.At the same time,the complexity of the algorithm is reduced by the method of cumulating first then correlating.
Key words:  BDS satellite  weak signal capture  coherent accumulation  NH code jump
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