天气雷达数字视频处理器(DVIP)的积分精度

ON THE ACCURACY OF A DIGITAL VIDEO INTEGRATOR PROCESSOR IN A WEATHER RADAR

数字视频积分器(DVIP)较模拟的视频积分器稳定可靠,尤为可贵的是可以与计算机联用因此当代的天气雷达几乎均采用DVIP。如何根据回波功率测量精度的要求设计一个DVIP或相反的情况,对于一个现有的DVIP,如何计算其积分精度,这是一个具有实用价值的课题。为此本文将推导出DVIP积分精度的公式,并对雷达回波在资料经座标转换后落在网格内的数据进行平均,得出平均回波功率测量的精度,在近距离可得到很大的改善。

A digital Video integration processor (DV1P) is more stable and reliable than an analog Video integrator, a DVIP can be used directly with a micro c mputer. This has made the DVIP technique applied in almost all of the modern weather radar systems. So. methods to design a DVIP according to the requirement of accuracy or, inversely, to calculate the integration accuracy of a giVen DVIP should be a useful subject. A formula, suggested for calculating the accuracy of a DVIP is usde to estimate the accuracy of the power aVerage from the radar data in each cartesian grid after the ccrrdinate conversion and a considerable improvement is achieVed in an area not far from the radar.