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新一代天气雷达回波强度自动标校技术
引用本文:柴秀梅,黄晓,黄兴玉.新一代天气雷达回波强度自动标校技术[J].气象科技,2007,35(3):418-422.
作者姓名:柴秀梅  黄晓  黄兴玉
作者单位:1. 中国气象局大气探测技术中心,北京,100081
2. 新疆气象局,乌鲁木齐,830002
3. 安徽四创电子股份有限公司,合肥,230088
摘    要:回波强度标定技术直接关系到定量测量的准确度,是新一代天气雷达组网定量测量的基础,是提高天气雷达探测精度的重要手段。简要介绍了新一代天气雷达系统的回波强度自动标校技术,并以CINRAD/CC雷达为例,对新一代多普勒天气雷达(CINRAD/CC)自动标校的技术原理作了详细分析,对其在自动标校中采用的DDS(Direct Digital Synthesis)技术以及标校技术的实施方法作了具体的介绍,对其回波强度自动标校的准确度进行了测量,给出了系统自动标校的实际检验结果。结果表明该系统发射参数、接收参数在出现较大变化时,能保证回波强度的测量准确度在1 dB以内。还对影响自动标校准确度的因素作了分析。

关 键 词:脉冲多普勒天气雷达  自动标校  探测精度  DDS信号源
收稿时间:2006/3/21 0:00:00
修稿时间:2006-03-212006-05-25

Method for Automatically Calibrating Echo Intensity of CINRAD System
Chai Xiumei,Huang Xiao and Huang Xingyu.Method for Automatically Calibrating Echo Intensity of CINRAD System[J].Meteorological Science and Technology,2007,35(3):418-422.
Authors:Chai Xiumei  Huang Xiao and Huang Xingyu
Institution:1. Atmosphere Observation Technology Center, CMA, Beijing 100081; 2. Xinjiang Meteorological Bureau, Urumehi 830002; 3 .Anhui Sun Create Ltd. ,Hefei 230088
Abstract:The calibration technology of radar reflectivity is directly related to the precision of radar quantitative measurement,being the fundamental factor for radar observation.Taking CINRAD/CC radar as an example,the principles of automatic calibration technology,the DDS(Direct Digital Synthesis) technique,which is used in calibration,and the implementation procedures are described in detail.The precision of automatic echo intensity calibration was measured and the testing results are given.The findings conclude that CINRAD/CC can ensure the precision less than 1 dB while the transmitter power and receiver gain change.The factors influencing the precision of automatic calibration are also analyzed.
Keywords:CINRAD system  calibration method  observation accuracy  DDS technique
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