天气雷达双数字处理系统探测结果的理论模拟实验分析研究

THEORETICAL SIMULATION TEST FOR THE PROBE RESULTS FROM THE DUAL DIGITAL PROCESSING SYSTEM OF WSR-81S RADAR

摘要:

用作者提出的雷达方程,理论模拟了同一部天气雷达使用方位积分方式不同,数据网格化处理方法不同的两个数字处理系统时探测结果的差异。结论是:和未方位积分的情况比,1/2、3/4指数加权方位积分使降水回波强度、反射因子、雨强分布曲线依次相对偏移到波束移去的方向,幅值依次降低,但降幅的数值不大。偏移在波束移入侧的差别小,在移出侧差别较大;数据网格化后不同的处理方法在2×2km²网格下强回波中心两侧两者都有可能出现10dBz以上的差别。

Abstract:

By using the radar equation developed by the authors, the differences in the probe results obtained in different forms of azimuthal integration and different processing methods of gridding with the dual digital processing system of the same weather radar are theoretically simulated. Some major conclusions are reached as follows. As compared with the non-azimuthal integration, the 1/2 and 3/4 exponential weighted azimuthal integration makes the precipitation echo intensity, the reflectivity factor and the precipitation intensity distribution curve move successively in the direction in which radar beams move. Their amplitudes decrease accordingly but the decrease of amplitudes are rather small, and the differences of reflectivity factor and precipitation rate are small on the side where beams move in and large on the side where beams move out. After coordinate transferring by different data processing methods, there might be a difference of over 10 dBz On either side of the intensive echo center in the 2×2 km² grid.