平面相控阵脉冲压缩的雷达气象方程

在低发射功率条件下,相控阵多普勒天气雷达为了增加探测距离和提高分辨率,需要采用脉冲压缩技术.由于采用相控阵技术,波束扫描过程中,在平面阵非法线方向上会产生波束展宽,引起波束内功率下降,需要在计算雷达气象方程时弥补功率下降的误差.平面相控阵天气雷达在探测远距离目标时,使用宽脉冲发射,经脉冲压缩处理以提高分辨率,因此需要建立适用的雷达气象方程.首先讨论了脉冲压缩低峰值功率的平面相控阵多普勒天气雷达的结构、线性调频脉冲压缩的距离(多普勒测量)、调频波形的耦合问题以及目标距离的测量;然后给出了适用于脉冲压缩的平面相控阵雷达气象方程,此方程同时也适用于一维线性阵的脉冲压缩的天气雷达.

Weather radar equation for planar array pulse compression radars

Pulse compression is employed in phased-array Doppler weather radar to increase the detection range and improve the range resolution under the condition of low transmission power.Three aspects,including the composition of low power Doppler weather radar with planar array and pulse compression,and range and Doppler measurements coupled with linear frequency modulated waveforms,and target range measurements,are discussed in this paper.Due to the nature of the conical beams scanning,the main beam broadens as it is scanned from broadside,and the power decreases within the main beam.For accurate and efficient computation of a reflectivity estimated from the weather signal data samples,the scan angle error correction for the two dimensional arrays weather radar equation is necessary.This paper presents the derivation of a correction to the weather radar equation for use with planar phased array and pulse compression radars.It is shown that the equation is also suitable for linear array pulse compression radars.