| GPS弱信号捕获算法研究 |
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| 引用本文： | 张风国,刘承禹,张红波.GPS弱信号捕获算法研究[J].全球定位系统,2011,36(5):12-16,21. |
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| 作者姓名： | 张风国 刘承禹 张红波 |
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| 作者单位： | 1. 中国电波传播研究所,山东青岛,266107
2. 二炮装备研究院,北京,100085 |
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| 摘 要： | 随着GNSS的广泛应用,许多新技术和新领域对GNSS弱信号捕获提出了新要求,其关键技术之一就是弱信号捕获跟踪算法的实现。在相干积分和非相干积分的基础上,通过相位补偿和时延修正、奇偶分路等方法,可以在盲搜索中捕获到比正常信号低25dB的弱信号,实现了对粗捕到的弱信号进行载波频率精化,并分别利用仿真数据和实测数据验证了算法的正确性。此外,分析了信号相位翻转对信号捕获的影响,对GNSS弱信号应用领域具有重要的参考价值。
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| 关 键 词： | GPS 弱信号 捕获 相干积分 奇偶分路 |
Acquisition Algorithm of Weak GPS Signal |
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| ZHANG Feng-guo ,LIU Cheng-yu,ZHANG Hong-bo.Acquisition Algorithm of Weak GPS Signal[J].Gnss World of China,2011,36(5):12-16,21. |
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| Authors: | ZHANG Feng-guo LIU Cheng-yu ZHANG Hong-bo |
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| Institution: | ZHANG Feng-guo 1,LIU Cheng-yu2,ZHANG Hong-bo 3(1.China Research Institute of Radiowave Propagation,Qingdao Shangdong 266107,China,2.The Equipment Research Institute of Second Artillery,Beijing 100085,China) |
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| Abstract: | With wide applications of GNSS,new technologies and domains bring forward new demands to GNSS weak signal acquisition,where the realization of acquisition and tracking of weak signal is a key process.On the basis of coherent and incoherent integration,signal 25 dB lower than normal can be captured by means of phase compensation,time delay correction and odd-even branches,whose carrier frequency can also be refined subsequently.The validity of this algorithm is proved with simulated and observed data.Besides... |
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| Keywords: | GPS weak signal acquisition coherent integration odd-even branches |
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