摘要
我国高空站网已普遍推广L波段雷达-数字探空仪系统,但业务上作为测风使用的L波段雷达设备的探测精度只经过了近距离静态目标的标定,缺乏相关的动态检验。为了解该系统的动态探测性能,作者在数字探空仪上增加了GPS定位模块,以获得的GPS高度数据作标准,分析了2006年5月至6月上海和南京探空站23份施放记录,结果表明:L波段雷达设备由于水平标定精度不够,造成测高误差较大,100hPa高度以下最大系统误差达到几百米,而且每个站的误差带有系统性,但利用GPS高度数据与雷达测得高度的对比分析结果,来修正雷达仰角参数后,大幅度提高了L波段雷达的测高准确度,系统误差在100hPa高度以下不超过40m。因此在高空探测业务上以GPS定位资料作为L波段雷达定标的参考标准具有可行性。
L-band Radar and Electrical Radiosonde System（LRERS） had been employed widely,but the detection accuracy of L-band Radar was obtained only by checking short distance static objects,which lacked related dynamic test.In order to know the altimetry precision of LRERS,a new radiosonde with GPS function module was developed,In view of high precision GPS being generally acknowledged in the world,23 electrical radiosondes with GPS function model was set free which were traced by L-band radar in Shanghai and Nanjing from the last ten days of May to the first ten days of June,2006.It is demonstrated from the analyzed result of 23 intercomparison data that As a wind-finding equipment,the height measuring error of L-band radar is rather big because of the less accuracy of the horizontal calibration precision,the most system deviation is several hectometers under the height of 100hPa.At the same time,it is found that the error is systematic at a given station.However,if the radar level is adjusted refer to the intercomparison result with GPS position data,the accuracy of the height measurement may be improved in much more degree,which is less than 40 meters below 100hPa height.so it is feasible to use GPS position data as Calibration reference method of L-band Radar.
出处
《气象》
CSCD
北大核心
2009年第2期88-93,共6页
Meteorological Monthly
基金
科技部科学技术研究专项课题"多功能高精度GPS探空仪系统"课题资助
关键词
L波段雷达
测高误差
GPS定位资料
系统误差
L-band radar height measurement errors GPS position data systematic error
