一种抑制电离层异常的优化Hatch滤波方法

An optimized Hatch filter method to inhibit ionospheric anomaly

基于拉普拉斯变换,在频域分析Hatch滤波原理,以及电离层时间梯度和空间梯度对Hatch滤波的影响;通过Z变换和逆Z变换获得Hatch滤波的解析解,在时域讨论滤波起始时间和滤波时间常数对Hatch滤波性能的影响,并在考虑电离层异常的前提下求得二者的最佳解,得到了一种抑制电离层异常的优化Hatch滤波方法;通过仿真实验将优化Hatch滤波与传统Hatch滤波相对比,验证了其优越性.

Based on the Laplace transform of Hatch filter, the principle of Hatch filter, and the effects of ionospheric spatial gradient and temporal gradient on the Hatch filter were analyzed in frequency domain. The analytic solution of the Hatch filter was obtained by Z-transform and inverse Z-transform and was analyzed in time domain. The filter start time and filter constant were optimized based on the solution, and an optimized Hatch filter method for inhibiting ionospheric anomaly was proposed. Finally, simulations results show that the performance of the optimized filters is better than that of the traditional filter.