When the S mode is applied to multi-point positioning and ADS-B systems, facing high-density A/C pulse interference, the existing decoding methods will lead to high error rates and low confidence data. Aiming at the environment with severe A/C pulse interference, this paper improves the S mode data decoding methods, including the midpoint judgment method, the baseline multi-point judgment method, the multi-point judgment method based on the lookup table, and the multi-point judgment method based on the simplified table. By analyzing the overlap probability of 40,000 times/second interference, a simulation method for the interference environment is proposed, and a large number of simulations are carried out on several decoding methods, obtaining a high decoding accuracy, and verifying the effectiveness of several S mode data decoding methods.
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