CAJ | 학술논문

根据功率倒置（ PI）阵列原理，基于目前空时滤波的抗干扰技术，采用无约束空时自适应抗干扰算法，对均匀圆形阵列的抗干扰性能进行分析仿真。该算法不需要预先知道卫星的位置信息、导航接收机位置信息以及接收天线姿态信息，降低了采样矩阵求逆（ SMI）算法的运算复杂度。在MATLAB中对窄带干扰和宽带干扰在不同情况下的干扰抑制效果进行仿真，仿真结果表明，无约束空时自适应抗干扰算法能够有效地判定干扰信号的波达方向，均匀圆形阵列不仅可以准确估计出干扰信号的方位角和俯仰角，且刚干扰效果最好；并在干扰方向上产生一定深度的零陷，干扰功率越强，产生的零陷越深。与LCMV算法相比，该算法能更好地改善系统输出信干比。
근거공솔도치（ PI）진렬원리，기우목전공시려파적항간우기술，채용무약속공시자괄응항간우산법，대균균원형진렬적항간우성능진행분석방진。해산법불수요예선지도위성적위치신식、도항접수궤위치신식이급접수천선자태신식，강저료채양구진구역（ SMI）산법적운산복잡도。재MATLAB중대착대간우화관대간우재불동정황하적간우억제효과진행방진，방진결과표명，무약속공시자괄응항간우산법능구유효지판정간우신호적파체방향，균균원형진렬불부가이준학고계출간우신호적방위각화부앙각，차강간우효과최호；병재간우방향상산생일정심도적령함，간우공솔월강，산생적령함월심。여LCMV산법상비，해산법능경호지개선계통수출신간비。
In this paper,based on the power inversion( PI) array principle and space?time filtering anti?interference technology,an unconstrained space?time adaptive processing ( STAP ) anti?interference algorithm is used to analyze and simulate the anti?interference performance of uniform circular array is analyzed and simulated.For this algorithm,it is not required to pre?know satellite location infor?mation,navigation receiver position information and receiving antenna attitude information,thus the computing complexity of sampling matrix inversion(SMI)is reduced.The simulations are performed for interference effect of narrow?band interference and broadband inter?ference based on MATLAB in different conditions, and the results show that the unconstrained space?time adaptive anti?interference algorithm can effectively determine the interference signal DOA of uniform circular array(UCA),and accurately estimate the azimuth angle and elevation angle of interference signal,and the anti?interference effect is best;and on the direction of interference,there is null?ing with certain depth,the stronger the interference power,the deeper the nulling.Compared with LCMV algorithm,this algorithm can better improve the signal to interference ratio of system.