CAJ | 학술논문

针对独立高斯白噪声背景和多个平面波干扰，尤其是低输入信噪比的情况，提出一种基于阵列信号协方差矩阵对角减载的波束形成技术。通过足够多次快拍的估计，得到接收信号稳定的协方差矩阵，对协方差矩阵进行适量的对角减载能提高阵列输出增益以及多目标的分辨能力。对基于对角减载的常规波束形成和最小方差无畸变波束形成器的阵列增益进行了仿真，分析了阵列增益随减载系数的变化关系，并研究了多目标分辨时对角减载系数的取值区间，最后仿真验证了对角减载技术提高MVDR多目标分辨能力的有效性。
침대독립고사백조성배경화다개평면파간우，우기시저수입신조비적정황，제출일충기우진렬신호협방차구진대각감재적파속형성기술。통과족구다차쾌박적고계，득도접수신호은정적협방차구진，대협방차구진진행괄량적대각감재능제고진렬수출증익이급다목표적분변능력。대기우대각감재적상규파속형성화최소방차무기변파속형성기적진렬증익진행료방진，분석료진렬증익수감재계수적변화관계，병연구료다목표분변시대각감재계수적취치구간，최후방진험증료대각감재기술제고MVDR다목표분변능력적유효성。
A beamforming method based on array signal covariance matrix diagonal reduction is proposed.By esti-mating enough snapshots, a stable covariance matrix of the received signal is obtained.Through the appropriate co-variance matrix diagonal reduction, the array output gain and the multi-target resolving ability can be improved.In this paper, the conventional beamforming ( CBF) and minimum variance distortionless response ( MVDR) beam-former's array gains were deduced and simulated based on diagonal reduction.The relationship between the array gain and reduction coefficient is analyzed and the reduction coefficient range for resolving multiple targets is studied. The results showed that the diagonal reduction method can improve the multi-target resolving ability of MVDR effec-tively.