一种卫星导航抗干扰天线数字信号正交分解方法

提出了一种基于 FIR 滤波器的卫星导航抗干扰天线数字信号正交分解方法。首先， 根据卫星导航信号在抗干扰天线中的中频中心频率及带宽信息确定带通滤波器的通带、阻带响应以及滤波器阶数等参数。接下来，采用 Parks-McClellan 算法分别设计滤波系数偶对称和奇对称的带通滤波器。最后，将抗干扰天线中 AD 采样后的中频数字实信号分别通过以上偶对称和奇对称的带通滤波器即可得到 I、Q 两路信号。本文所提方法具有计算量小、精度高且易于工程实现的特点。通过对实测数据分析验证了本文所提方法的有效性。

Digital Signal Orthogonal Decomposition Method for Satellite Navigation Anti-Jammer Antennas

A digital orthogonal decomposition method for satellite navigation anti-jammer antennas is proposed in this paper based on FIR filters. Firstly, the responses of pass-band, stop-bands and the number of filter orders are determined according to the intermediate frequency and bandwidth of the satellite navigation signals. Then, an odd symmetrical FIR filter and an even symmetrical FIR filter are designed by using the Parks-McClellan algorithm. Finally, I channel signals and Q channel signals can be got by filtering the real intermediate frequency output from the AD converters using the odd symmetrical FIR filter and the even symmetrical FIR filter respectively. The method proposed in this paper has less computation load and suits realization in projects. The testing results verify the effectiveness and practicability of the method in this paper.