流星雷达系统相位差偏差的估计和校正

介绍了一种新的流星雷达系统的相位偏差估计和校正方法.利用流星回波的观测数据,用回波信号在各个接收通道之间的相位差,结合干涉式接收天线阵的几何关系,建立了各天线相位差测量值与偏差值之间的线性方程组,利用最小二乘法求解方程组,得到了流星雷达系统各个接收通道之间的相位差偏差估计值及校正后的流星回波到达角.与已有的流星雷达相位偏差估计和校正的方法相比,这种方法可以通过流星雷达的观测数据来计破算雷达系统各个接收天线通道之间的相位差偏差量,而不需要增加额外的硬件,实现了对观测数据的事后处理,可以方便地对已有数据进行校正.以2004年4-6月的武汉流星雷达观测数据为例,计算了流星雷达系统的偏差估计量,并用校正后的数据来计算流星回波的空间位置.结果表明,校正后流星回波数在各个方向上随高度的分布比校正前更符合统计分布. 

Phase Bias Estimation and Calibration of Meteor Radar System

A new method was developed to estimate the radar system phase bias and calibrate the radar system.Using the data collected by this radar,the phase differences of the meteor echo between each receiver pairs are estimated,by taking account of the receiver pairs geometries the linear equation matrix is formed,the phase bias between each receiver pairs in the least-squares sense is solved,and finally the location of meteor echoes after calibration is found.Compared with the conventional method,this method can use the history data to find the system phase bias,without the need for additional hardware.It can routinely use for off-line to correct data collected using the bias estimated before.The data of Wuhan Meteor Radar(WHMR)between April 2004 to June 2004 is used as an example,the bias of the radar system is estimated and the data is used after calibration to calculate the location of the meteor echoes.The data calibrated using this method show a more consistent height distribution in terms of number of echoes with the same meridian.