基于反演策略的星基ADS-B信号译码方法

Space-Based ADS-B Signal Decoding by Inversion Method

针对低信噪比下星基广播式自动相关监视(ADS-B)信号译码准确率低的问题,提出一种基于反演策略的星基ADS-B译码技术。基本思想是假设传输一帧ADS-B信号的空间在该帧信号传输时间段内是一个稳定的线性系统,接收端接收信号是发射端信号与该线性系统的卷积和。根据该思想,反演译码包括报头检测、空间系统参数估计、报文反演、码脉冲波形修正等关键步骤。仿真实验表明,该方法能够准确实现对低性噪比ADS-B信号各码脉冲译码,译码正确率远高于常规单脉冲检测译码技术。

To solve the problem of low accuracy of space-based automatic dependent surveillance-broadcast(ADS-B) signal decoding under low signal-to-noise ratio, the paper proposes a new inversion decoding method. It supposed that the ADS-B signal transmission space is a stable linear system during the transmission period, and the received signal is convoluted by the space system and transmitted ADS-B signal. According to this idea, the inversion decoding includes signal preamble detection, space system parameters estimation, signal inversion, pulse waveform correction. A simulation experiment was conducted. In the experiment, the accuracy ADS-B decoding pulse sequence was extracted and the decoding correctness rate was much higher than the mono-pulse detection method. The results verified the validity of the proposed inversion decoding method.