论文部分内容阅读
针对同时辐射多载频的正交信号、收发天线稀布且不共用的单基地MIMO雷达,以及在低仰角目标回波存在多径现象的情况下,提出一种基于SIAR体制的单基地MIMO雷达的方向综合方法,即综合利用MIMO的发射天线和接收天线孔径,在方位和俯仰两维数字波束形成(DBF);并结合多载频工作的MIMO雷达,研究了基于多径相干信号分离的面阵广义MUSIC算法.该方法将发射天线、接收天线的相位延迟同时补偿,在接收端对发射波束进行两维方向综合,提高了雷达的角分辨力和测角精度;并通过降维处理减少了运算量.最后给出了多径情况下,单基地MIMO雷达方位、俯仰二维角度估计的克拉美·罗界(CRB).计算机仿真证实了该方法的有效性.
For the single-base MIMO radar which emits quadrature signals with multi-carrier frequencies simultaneously and the transmitting and receiving antennas are sparse and unshared, and a multipath phenomenon exists at low-elevation target echo, a single-base MIMO radar based on SIAR is proposed Direction synthesis method, that is to make full use of the transmit antenna and the receive antenna aperture of the MIMO antenna in the two-dimensional azimuth and elevation digital beamforming (DBF); and combining the multi-carrier MIMO radar, This method combines the phase delay of the transmitting antenna and the receiving antenna at the same time and compensates the phase delay of the transmitting beam at the receiving end to improve the angular resolution and the angle accuracy of the radar. And the computational complexity.Finally, the Cramer-Rarborg (CRB) of azimuth and pitch two-dimensional angular estimation of single-base MIMO radar under multi-path conditions is given.The computer simulation verifies the effectiveness of the proposed method.