基于射频隐身的雷达发射波束形成方法

为进一步提高雷达的射频隐身性能，提出了基于射频隐身的宽带发射波束形成方法。首先根据目标距离和目标雷达横截面积设计了主瓣方向的功率大小，确定了工作的阵元数。然后考虑截获接收机位置信息的角度误差，建立宽带信号频域模型，利用旋转信号子空间方法对宽带信号进行聚焦并计算信号的自相关矩阵。最后利用约束最小方差准则产生权向量，完成了发射波束的零陷设计。仿真结果表明，提出的发射波束形成方法与零陷设计前的方法相比，具有较低的截获概率和较好的射频隐身性能。

A Novel Method of Radar Transmit Beamforming Based Radio Frequency Stealth

In order to improve the radar＇s ability of radio frequency stealth（RFS）, a novel control meth- od for transmitting wideband beam is proposed. Firstly, the transmitted power towards the target and the number of the radar array are decided by the target range and radar cross section（RCS）. Then the wideband signal model in the frequency domain is built according to the interceptor＇s position information. The focusing method of rotational signal-subspace （RSS） is used to compute the autoeorrelation matrix. The optimal weight vector of the transmit beamforming is derived by the constrained minimum variance, and the beam null-forming is achieved. The simulation results show that the proposed method has lower intercept probabil- ity and better RFS performance than the methods without beam null-forming design.