| 一种低SNR环境下的跟踪环路 |
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| 引用本文： | 苏征凯,林静然,彭启琮. 一种低SNR环境下的跟踪环路[J]. 信息安全与通信保密, 2011, 0(2): 35-37 |
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| 作者姓名： | 苏征凯 林静然 彭启琮 |
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| 作者单位： | 电子科技大学通信与信息工程学院,四川,成都,611731 |
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| 摘 要： | 低信噪比（SNR）环境下GPS信号的跟踪一直是近年来研究的热点，主要介绍了在GPS信号较弱的条件下，通过增加积分时间来提高载波环跟踪精度的方法。详细介绍了GPS载波环工作原理，并推导了载波环滤波器增加积分时间的理论依据。最后，采用GPS模拟信号源产生的数据进行环路性能仿真，实验结果表明该环路设计可在-30dB的SNR环境下正常工作。
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| 关 键 词： | 全球卫星定位系统（GPS） 载波环 相干积分 |
A Tracking Loop in Low SNR Condition |
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| SU Zheng-kai,LIN Jing-ran,PENG Qi-cong. A Tracking Loop in Low SNR Condition[J]. China Information Security, 2011, 0(2): 35-37 |
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| Authors: | SU Zheng-kai LIN Jing-ran PENG Qi-cong |
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| Affiliation: | SU Zheng-kai,LIN Jing-ran,PENG Qi-cong(School of Communication and Information Engineering,University of electronic science and technology of China,Chengdu sichuan 611731,China) |
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| Abstract: | The track of GPS signals under low SNR environment is always a hotspot in recent years.This paper describes the way to enhance track loop performance through raising coherent integration time in the condition of weak GPS signals.The working principles of carrier loop are presented and the theoretical basis of coherent integration is derived.Then,the simulation of carrier loop based on simulative GPS signals shows that this carrier loop could work properly under-30dB SNR condition. |
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| Keywords: | GPS (Global Positioning System) carrier loop coherent integration |
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