摘要
随着雷达技术的广泛应用,雷达也面临诸多挑战,在对微弱目标检测时,由于直达波回波和多径回波同时存在导致无法准确检测到目标,因此通常将多径回波当作干扰。然而,可以利用多径信号中存在的目标信息来优化探测性能。因此,本文提出一种新的利用多径信号增强直达波信号的微弱目标增强算法(Multipath Signal Exploitation,MSE),算法通过构造两个位移函数在距离频域慢时间域对回波进行补偿,消除了不同初始距离的影响,将多径信号回波集中在直达波所在位置。然后对补偿后的回波和直达波沿快时间维求和,进一步增强了回波的能量。此外,当存在多个目标时,MSE算法可以消除多径回波的干扰,并且利用多径回波增强多目标的信号能量,以保证在多个目标的多径环境下算法仍然有效。最后进行了仿真实验,结果证明了MSE算法在多目标场景下的有效性。
With the wide application of radar technology,radar is also faced with many challenges.For weak target detection,the simultaneous existence of direct path echoes and multipath echoes makes it impossible to detect the target accurately.So generally multipath echoes are considered as interference.However,the multipath echoes contain target’s motion information,which should be used to enhance the radar detection performance.Therefore,in this paper,a novel signal enhancement algorithm is proposed to detect weak target based on multipath signal exploitation(MSE).Two dis-placement functions are constructed to compensate the echoes in range frequency-slow time domain,which eliminates the influence of different initial distances,and the multipath echoes are focused on where the direct path echos locate.Then,the compensated echoes and direct path echoes are summed along the fast time dimension,and the energy of the echoes is further focused.In addition,when there are multiple targets,MSE algorithm can eliminate the interference of multipath echoes and enhance the signal energy of multiple targets by using multipath echoes,which ensures that the algorithm is still effective when there are multiple targets in multipath environment.At last,some simulation experi-ments are provided to testify the effectiveness of MSE in multi-targets scenario.
作者
何文滨
饶烜
朱炳祺
HE Wenbin;RAO Xuan;ZHU Bingqi(School of Information Engineering,Nanchang Hangkong University,Nanchang 330063,China;Shanghai Radio Equipment Research Institute,Shanghai 201109,China)
出处
《雷达科学与技术》
北大核心
2025年第4期462-472,共11页
Radar Science and Technology
基金
国家自然科学基金(No.62161029)
江西省自然科学基金(No.20202BABL202002)。
关键词
多径利用
微弱目标增强
多目标
补偿函数
multipath signal exploitation
weak target enhancement
multi-targets
displacement function
作者简介
何文滨,女,硕士,主要研究方向为雷达通信一体化、微弱目标检测、雷达信号处理;饶烜,男,副教授、硕士生导师,主要研究方向为雷达通信一体化、微弱目标检测、雷达信号处理;朱炳祺,男,研究员,主要研究方向为雷达波形设计、合成孔径雷达成像。
