基于幅相复平面的空管雷达测高方法研究

Research on altimetry method of ATC radar based on amplitude-phase complex plane

针对两坐标体制的空管一次雷达对目标高度测量需求,提出了一种基于幅相复平面的空管一次雷达测高方法.利用高低双波束幅相差构建复平面,在复平面-仰角形成的复空间内形成拟合曲线,通过待测样本的高低波束幅相差值在三维拟合曲线进行插值,从而得到目标仰角,进而结合目标距离获得目标高度.实录数据统计分析表明,相比传统的比相测角方法,该方法在对低仰角和低信噪比目标的仰角测量精度上具有明显优势.

Aimed at the requirement of target altitude measurement for air traffic control(ATC)primary radar with two-coordinate system,a method of ATC primary radar altitude measurement based on amplitude-phase complex plane is proposed.In the method,the amplitude difference and phase difference of high-low double beams are used to construct the complex plane,and the fitting curve is formed in the complex space constituted by the complex plane-elevation angle.By interpolating in the 3D fitting curves the amplitude-phase difference value of the high-low beam of the sample to be measured,the elevation angle of the target is obtained,and the target altitude is also gained by combining the target distance.The statistical analysis of recorded data shows that compared with the traditional phase comparison angle measure method,the proposed method has obvious advantages in the accuracy of elevation angle measurement for the targets with low elevation and low SNR.