多波束相控阵天线角度测量方法

An Angle Measurement Method for Multi-beam Phased Array Antenna

在雷达、通信、测控等领域中,基于相控阵天线的幅度和差单脉冲测角技术是基本方法,但该方法通过旋转法向方向图去近似表示子波束方向图,并用一阶泰勒公式近似表示子波束接收信号幅度,从而带来非噪声因素误差,最终导致目标角度估计精度不高。为此,通过相控阵天线同时产生两个形状相同但相互独立的子波束,旋转波束指向中心轴方向的方向图函数来确定两个子波束的方向图函数,并用高阶泰勒公式对子波束接收信号幅度进行近似,从而减少误差。仿真和硬件测试结果表明所提方法能够有效提高测角精度。

In the fields of radar,communication,TT&C,sum-difference amplitude-comparison monopulse angle measurement technology based on phased array antenna is the basic method.However,the sub-beam pattern represented by rotating the beam pointing to the normal direction,and the received signal amplitude of the sub-beam is approximated by the first-order Taylor formula in the basic method,resulting in non-noise factor errors and leading to low precision of target angle estimation.A new method is proposed to solve above problems.In this method,phased array antenna simultaneously produces two independent sub-beams with the same shape and the sub-beam patterns is determined by rotating the beam pointing to the center axis direction,and the amplitude of received signal is approximated by the high-order Taylor formula.Both simulation and hardware test results show that the new method can effectively improve the precision of angle estimation.