高精度单脉冲角度跟踪新方法

New angle tracking methodology with high precision

在雷达、通信、测控等领域的角度跟踪中,基于相控阵天线的幅度和差单脉冲测角技术是主要方法,但存在以下测角误差来源:一是低SNR导致的信号幅度估计误差,二是改变波束指向导致的方向图畸变误差。针对上述误差来源,采用信号循环位移自相关,用于估计信号幅度,减小带内噪声对信号的影响;进一步利用同心圆环阵在结构上的对称性,减小改变波束指向导致的方向图变形。介绍了新算法的实施步骤,分析了运算复杂度。仿真结果表明,本文方法能够有效地提高测角精度。

In the angle tracking of radar,communication,TT&C and other fields,sum-difference amplitude-comparison mono-pulse angle measurement technology that based on phased array antenna is the main methodology.However,the following angle measurement errors exist.One is the estimation error of signal amplitude caused by low SNR.The other is the pattern distortion error caused by changing the beam pointing.In order to reduce these errors,the cyclic-shifted autocorrelation is proposed to esti-mate the signal amplitude,so that the in-band noise could be mitigated.In addition,the concentric ring arrays with structural sym-metry is utilized to reduce the distortion of the pattern furtherly.The implementation steps and computational complexity analysis of the new algorithm is present.Simulation illustrates that new methodology can effectively improve the precision of angle esti-mation.