L波段探空系统高空风平滑计算方法探讨

Discussion of Smoothing Methods of Upper-Air Wind Measured by L-Band Radar and Radiosonde Sounding System

在分析现行业务L波段探空系统测风原理的基础上,提出改进高空测风数据的平滑计算方法。首先比较了业务分钟风与滑动平均风两种高空测风数据的平滑计算方法,并与GPS RS92测风数据进行了对比分析和批统计处理,特别是对业务L波段雷达在1-21、22-42和43分钟及以后采取不同的时间间隔计算风的规定给出了分时段以及低仰角、远距离和小风速的统计分析。结果显示,滑动平均法在选取合适的滑动平均窗口的条件下,其计算的高空风与GPS RS92测风结果一致性更好且动态误差小。建议未来改进业务L波段探空系统的高空风平滑计算方法时,采用窗口为1分钟的滑动平均方式或者前20分钟采用30秒,以后采用1分钟的分段滑动平均方法。

Based on the analysis of wind measurement of operational L-band radar and radiosonde sounding system,it is proposed an improved smoothing algorithm of upper-air wind.Firstly,the differences of two smoothing algorithms for upper-air winds,which are the operational minute wind and the moving average wind,are compared.Then they are also compared with GPS RS92 wind.The comparative analysis and the results of statistical processing are given,especially are also given several segmented statistical analysis of low elevation,long-distance,low wind and sub-period wind.The last one is regulated by operational rules that use different time intervals to calculate smoothing wind in three periods of an upper-air sounding process,i.e.,the first 21 minutes,in 22-42 minutes and 43 minutes later.The results show that the vector wind using the most appropriate moving average window has a better consistency with GPS RS92 wind and a small dynamic error.It is suggested that the moving average method of 1 min window or 30 sec window at first 20 minutes and then 1 min window should be used for the future algorithm improvement of upper-air wind measured by operational L-band radar and radiosonde sounding system.