基于 JADE 的测距仪脉冲干扰抑制方法

摘要

为解决测距仪脉冲信号干扰 L 频段数字航空通信系统1（L-band digital aeronautical communications system 1，L-DACS1）正交频分复用接收机的问题，提出一种基于特征矩阵联合对角化（joint approximate diago-nalization of eigen-matrices，JADE）的测距仪脉冲干扰抑制方法。首先将干扰抑制问题转化为盲源分离问题，在接收端建立频域盲分离模型，利用 JADE 算法将接收到有用信号与测距仪干扰信号分离；然后根据干扰信号的功率特性进行分离后信号的识别；最后通过训练序列解决盲源分离固有的幅度模糊性问题，最终恢复出有用接收信号。仿真结果表明：所提出的基于 JADE 的干扰抑制方法可有效消除测距仪脉冲信号干扰，改善系统的误比特性能，增加传输可靠性。%In order to solve the problem that the distance measure equipment (DME)impulse signal pro-duces serious interference on the orthogonal frequency division multiplexing receiver of L-band digital aeronauti-cal communications system 1(L-DACS1),a DME interference mitigation method based on joint approximate di-agonalization of eigen-matrices(JADE)is proposed.Firstly,the problem of interference suppression is trans-formed into blind source separation.After establishing the frequency domain separation model at the receiver, the JADE method is used to separate the useful received signal and DME impulse interference.Then,the sepa-rated signal is identified by using the power characteristic of the interference signal.Finally,the inherent ambi-guity problem of blind source separation is solved by using training-sequence,and eventually the useful received signal is recovered.It can be indicated by simulation that the proposed JADE method can eliminate the DME im-pulse interference effectively,and improve the bit-error performance and the reliability of transmission link.