基于修正GAPES的GPS脉冲干扰抑制方法

GPS L5信号以及我国北斗卫星导航系统所用的B2a信号是未来全球卫星导航系统的重要组成部分，但现存的航空无线电设备对L5和B2a信号所在频段造成了不可忽视的干扰，其中测距仪设备的大功率脉冲干扰是GPS L5所在频段内主要的脉冲干扰源。在脉冲干扰抑制方法中，最常用的脉冲干扰抑制方法是时域脉冲消隐方法。但此方法在抑制干扰的同时会造成有用信息的丢失，形成缺口数据。本文提出一种缺失数据恢复的新方法，首先利用混合滤波方法抑制干扰，得到缺口数据的部分有用信息，用此信息作为初始值，进行循环迭代处理。由于利用了缺口数据部分的有用信息，因此该方法得到的缺口数据估计值更接近于未受干扰的原始数据。仿真实验结果表明，所提方法相比传统GAPES方法具有更好的性能。 

A New Pulse Interference Suppression Method in GPS Based on Modified GAPES

GPS L5 signal together with Compass B2a signal are essential components of future GNSS (Global Navigation Satellite System). However, the existing aeronautical radio equipments make great interference on the frequency bands of L5 and B2a signals. Among the interference sources, the pulse pair with high power from DME (Distance Measurement Equipment) is the most serious one. The most frequently used interference suppression method is pulse blanking in time domain. However, this method will lose information while suppressing pulse interference, and thus induce gapped data. In this paper, we propose a new method to restore gapped data. Firstly suppress the interference using hybrid filtering method, and then we can get some of the information in the gaps. Using the information as initial values of an iteration process, we can get a more accurate result compared with the original data with no DME interference, because we have used the useful information in the gaps. The results of numerical experiments have shown that the proposed method possess better performance than traditional GAPES (Gapped-data Amplitude and Phase Estimation) method.