移动双偏振雷达野外观测模式探讨

Preliminary Discussion on Field Observation Pattern for Mobile Dual Polarization Radar

文章分析了WSR-88D或CINRAD/SA中常用的降水模式VCP21的扫描特点与扫描参数,结合移动雷达的参数设置要求与预报服务的需求,探讨了移动雷达体扫描的设定。主要有三个方面:(1)由于起始角度选择不当,使地物杂波对反射率产品与双偏振产品质量产生影响;(2)探讨径向扫描参数,如脉宽、距离库、探测距离、脉冲重复频率等之间相互制约的关系,考虑以62.5km为代表的近距离、125km为代表的远距离与两者之间各参数的预设值;(3)基于移动雷达补充现有两部S波段多普勒天气雷达扫描探测盲区的服务需求,初步研究体扫描中仰角值的设置。

The paper analyzed scanning characteristic and parameter of precipitation mode VCP21 of WSR-88D or CINRAD/SA, combining with the demand of parameter setting and requirement of forecast service, the setting of moving radar swept-volume was discussed. There are three aspects as follows： 1） because of improper selection of start angle, ground clutter influenced the quality of refleetivity products and dual-polarization products. 2） the interaction relationship of radial scanning parameters such as pulse width, range bin, range, detection range, pulse repetition rate, ete were discussed, and considered the preset value of every parameter between close range that taking 62.5km for representative and remote range that taking 125kin for representative. 3） Based on service needs that mobile radar supplemented the scanning detection dead zone of two Doppler weather radars in S hand, preliminary discussed the setting of elevation value in swept-volume.