联合两级滤波与压缩感知的测距仪干扰抑制方法

DME Impulse Interference Mitigation Method Based on Joint Two-stage Filtering and Compressed Sensing

针对测距仪(Distance Measure Equipment,DME)脉冲信号对L频段数字航空通信系统1(L-band Digital Aeronautical Communication System 1,L-DACS1)接收机产生干扰的问题,提出一种联合两级滤波与压缩感知的DME干扰抑制方法。首先,接收机通过高通滤波器估计出DME干扰,并在时域将其从接收信号中消除;然后,通过低通滤波器进一步滤除残留的DME干扰和噪声;最后,针对经过两级滤波后仍残留的DME干扰,基于其在时域中的稀疏特性应用压缩感知算法实现重构并消除。数值仿真表明,所提方法可获得的DME干扰功率衰减值约41 dB,有效克服了DME脉冲干扰对L-DACS1系统接收机的影响。

To mitigate the deleterious influence of the distance measure equipment(DME)impulse signal on the receiver of L-band digital aeronautical communication system 1(L-DACS1),a DME interference mitigation method based on joint two-stage filtering and compressed sensing was proposed.Firstly,DME interference was estimated by a high-pass filter in the receiver and eliminated from the received signals in time domain.Then,the residual DME interference and noise were further filtered out by low-pass filtering.Finally,based on the sparse characteristics of DME signal in time domain,the remaining DME interference after two-stage filtering were further reconstructed and eliminated using compressed sensing algorithm.Numerical simulation shows that using the proposed method in this paper,DME interference power can be attenuated about 41 dB,which effectively overcomes the impact of DME pulse interference on the receiver of L-DACS1 system.