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卫星导航系统需要对信号进行精确同步的接收,然而干扰很容易影响到其同步性能,其中最为常见的一种干扰形式就是单频干扰。在采用传统方法对干扰下的码跟踪性能进行分析的时候,通常都会将伪码频谱假设成为连续谱,而且其相关输出的干扰的分量都是按照零均值的高斯分布,但是在GPS L1信号等短周期伪码的卫星导航信号中具有比较明显的离散谱的影响,而且这时候伪码连续谱假设和高斯假设等均不成立。为此,本文立足于伪码为离散频谱的情况下分析单频干扰下码跟踪误差,并且对降低信号码跟踪性能受到的单频干扰影响的方式进行了分析。
The satellite navigation system needs to receive signals accurately and synchronously. However, the interference easily affects the synchronization performance. One of the most common forms of interference is the single-frequency interference. When using the traditional method to analyze the code tracking performance under the interference, the pseudo-code spectrum is usually assumed to be a continuous spectrum, and the interference components of the correlation output are all distributed according to a zero-mean Gaussian distribution. However, in the GPS L1 signal and the like Short-period pseudorandom satellite navigation signals have a more obvious discrete spectrum, and this time pseudo-code continuous spectrum assumption and Gaussian assumptions, etc. are not established. Therefore, this paper analyzes the tracking error of single-frequency interference based on the discrete spectrum of pseudo-code, and analyzes the way to reduce the influence of single-frequency interference on the tracking performance of signal code.