WANG Di1,2, CHEN Guang-wu1,2, LIU She-de1,2
（1. Automatic Control Institute, Lanzhou Jiaotong University, Lanzhou 730070, China； 2. Gansu Provincial Key Laboratory of Traffic Information Engineering and Control, Lanzhou 730070, China）
Abstract： In this paper, a new idea based on pseudolite signal acquisition method aiming to mitigate the near-far effect problem in the satellite positioning is proposed. After analyzing the signal capture principle based on coherent integration and non-coherent accumulation, the cross-correlation interference of strong and weak signals is eliminated by means of normalization of reconstructed strong signal and judgement of the characteristics of the peak value, which can avoid the near-far effect of the pseudolite signal. It can also estimate all the strong signals without any additional hardware. By building an indoor pseudolite positioning system, the capture performance becomes better based on improved acquisition algorithm compared with that based on the non-coherent accumulation after coherent integration algorithm. The near-far effect is restrained effectively and the probability of weak signal detection is increased by 25%.
Key words： Pseudolite； near-far effect； coherent integral； kurtosis
CLD number： TN967Document code： A
Article ID： 1674-8042（2017）03-0228-10 doi： 10.3969/j.issn.1674-80422017-03-004
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基于伪卫星信号捕获原理的抗远近效应方法研究
王迪1,2， 陈光武1,2， 刘射德1,2
（1. 兰州交通大学 自动控制研究所， 甘肃 兰州 730070； 2. 甘肃省高原交通信息工程及控制重点实验室， 甘肃 兰州 730070）
摘要:针对导航领域中伪卫星定位存在的远近效应问题， 提出一种基于伪卫星信号捕获原理的抗远近效应新方法。 在对信号相干积分非相干累加捕获原理分析的基础上， 通过重建强信号的归一化以及弱信号峰度特征值的判断来消除强弱信号的互相关干扰， 实现伪卫星信号远近效应的消除。 该方法可以一次对所有强信号进行估计， 不需要另外增加硬件资源。 通过搭建室内伪卫星定位系统及仿真可知， 与相干积分非相干累加算法相比， 其捕获性能更优， 远近效应得到了有效的抑制， 弱信号检测概率提高了25%。
关键词:伪卫星； 远近效应； 相干积分； 峰度
引用格式：WANG Di, CHEN Guang-wu, LIU She-de. Near-far effect mitigation method using pseudolite signal acquisition. Journal of Measurement Science and Instrumentation, 2017, 8(3)： 228-237. ［doi： 10.3969／j.issn.1674-8042.2017-03-04］
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