Method for suppressing passive intermodulation interference based on adaptive filtering
An adaptive filtering and interference suppression technology, applied in electrical components, transmission systems, etc., can solve problems such as only considering second-order intermodulation, model simplification, etc., and achieve good real-time performance, low resource cost, and stable performance
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[0035] Taking the S-band communication satellite transponder as an example, using the present invention "a passive intermodulation interference suppression method based on adaptive filtering" to realize passive intermodulation interference suppression, such as figure 1 shown.
[0036] Step 1. Using the characteristics of the transmitted signal, analyze the characteristics of PIM products of each order;
[0037] The parameters of the known transponder transmitter, that is, the characteristics of the transmitted signal are as follows:
[0038] (1) Center frequency of transmitting signal: S-band transmitting frequency range is 2030MHz~2060MHz. Taking the dual-carrier as an example, the center frequency of the transmitted signal of the dual-carrier is selected as, f 1 =2030MHz,f 2 =2060MHz;
[0039] (2) Modulation output symbol rate: 2.5Mbaud;
[0040] (3) Modulation method: BPSK;
[0041] (4) Channel coding method: none;
[0042] (5) Modulation shaping window function: roo...
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