扇形扫描的TWS雷达目标方位角对距离估计误差的影响

The Effect of Target Angle on Range Estimate Error in Sector Scan TWS Radar

针对雷达天线在一定的扇扫范围内往复运动时 ,同一目标的相邻点迹之间采样间隔的变化规律 ,提出了扇形扫描 TWS雷达目标跟踪和航迹管理系统中 ,目标出现时间的滤波和预测方程 ,进而推导出极坐标系下的 α- β滤波的滤波方程和外推方程 .对扇形扫描条件下的矩形跟踪门进行了误差分析 ,指出跟踪误差受目标所处方位角的影响 ,并定量分析了这种情况下跟踪误差的补偿方法 .根据滤波增益与跟踪误差的关系 ,确定了 α- β滤波器在扇形扫描情况下滤波增益的计算方法 .仿真结果表明 。

The change regulation of sample interval in sector scan TWS radar is discussed. Based on the interval change regulation resulting from the antenna is moving to and fro, the interval filtering and prediction equation for tracking target and track managing, system in sector scan TWS radar are developed, α β filtering and predicting formula in polar coordinates for sector scan radar is established. The estimate error in target tracking with rectangular gate is analyzed, it is indicated that the target angle will affect the tracking error, and the means for compensating this error is developed. According to the relation between tracking error and filter gain, a method of calculating the α β filter gain in sector scan is presented. The results of simulations are in agreement with the theoretical analysis, the range predicting error is effectively reduced by this method.