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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, the Hatch filtering principle is analyzed in the frequency domain, and the influence of the ionospheric time gradient and spatial gradient on Hatch filtering is analyzed. The analytic solution of Hatch filtering is obtained by Z transform and inverse Z transform, Time and filter time constant on the Hatch filtering performance, and taking into account the ionospheric anomalies under the premise of the best solution of the two obtained a suppression of ionospheric anomaly Hatch filtering optimization method; through the simulation experiments will be optimized Hatch Compared with the traditional Hatch filter, the filter validates its superiority.