GNSS Multipath Effect Suppression Method Based on EMD Iterative Threshold Filtering
A multipath effect and iterative threshold technology, applied in the field of global satellite navigation systems, can solve problems such as complex adaptive filter design
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[0086] This embodiment mainly includes the following steps:
[0087] (1) Establish a GNSS short-baseline measurement model. The distribution of receivers is shown in Figure (2), which includes a differential measurement system with 1 master receiver and 3 slave receivers. The distance between each receiver is known. The distance between the main receiver and the slave receiver 1 is d1=21.140m, and the distance data d2 between the master receiver and the slave receiver 1 is obtained by using the measurement results of satellite positioning, and e(t)=d1-d2 is the short baseline measurement error including multipath error;
[0088] (2) Perform conventional EMD decomposition on e(t) to determine the number of IMFs that require noise-assisted analysis. In this example, M=2, and the auxiliary noise is Gaussian white noise wn(0,σ 2 ), where σ=0.01, the number of iterations is I=200 times, adopting the EMD improved decomposition method proposed by the present invention to obtain imf ...
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