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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%。
Aiming at the near and far effect of Pseudolite positioning in the navigation field, a new anti-fading and anti-fading method based on the principle of pseudolite signal acquisition is proposed. Based on the analysis of the principle of incoherent accumulation and acquisition of signal coherent integration, the cross-correlation of strong and weak signals is eliminated by normalizing the reconstructed strong signal and judging the eigenvalues of weak signals, so as to eliminate the far-near effect of pseudo- . This method can estimate all the strong signals at one time without any additional hardware resources. By building an indoor positioning system and simulation of pseudolite, we can see that compared with the coherent integration incoherent accumulation algorithm, the acquisition performance is better and the near-far effect is effectively suppressed, and the probability of weak signal detection is improved by 25%.