CINRAD/SB雷达回波强度定标调校方法
The Method of CINRAD/SB Radar Echo Intensity Calibration and Adjustment
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摘要: 回波强度定标和调校方法是保障CINRAD/SB回波强度测量精度的关键技术,方法不当会导致回波强度测量误差增大,直接影响雷达定量估测降水产品的可靠性。为了满足回波强度测量误差在±1 dBZ范围内的技术要求,根据雷达气象方程,通过对CINRAD/SB接收机测试通道、主通道、天馈系统相关影响回波强度测量误差的因素进行分析,提出了从接收机动态范围和雷达参数调整、线性通道增益定标目标常数定标,到测试通道参数调整的回波强度定标工作流程。总结出以线性通道增益定标目标常数定标为基准,采用测试通道参数测量法或基准法调校,以保证发射功率和接收机动态范围变化导致的回波强度测量误差得到在线实时校正,提高了CINRAD/SB回波强度测量精度。从接收机测试通道、主通道、天馈系统及发射功率4个方面,给出了回波异常的分析和诊断流程。并提出在接收机保护器前端增加机外信号注入口和定标信号功率检测功能,以利于机内外回波强度定标对比校准和消除测试通道参数变化导致回波强度测量误差的建议。
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关键词:
- CINRAD/SB雷达;
- 回波强度定标;
- 测量误差;
- 线性通道增益定标目标常数
Abstract: CINRAD echo intensity calibration is the key technology to improve the reliability of observational data. Improper intensity calibration adjustment method or mishandling of the alarm can lead to large measurement error. Based on test procedure of CINRAD/SB radar signal and the principle of echo intensity calibration, the work discipline of echo intensity calibration is established. The related parameter measurement, calibration and adjustment methods are introduced, clarifying receiver dynamic range, radar parameters, the line channel target syscal constant, test channel parameters. To meet the receiver's dynamic range, parameter measured adjustment method or the standards method is applied and the line channel target syscal constant calibration is considered. These methods ensure that echo intensity measurement error caused by changes of transmit power and receiver dynamic range is calibrated with real time corrected echo intensity data, and the technical requirements for controlling echo intensity measurement error range within±1 dBZ are met. The mechanisms through which receiver test channel parameter change and transmit power measurement error lead to the echo intensity measurement error are also discussed in detail. Calibration problem diagnosis and treatment process of CINRAD/SB radar echo intensity are illustrated based on relevant alarms of echo intensity calibration and echo display information, combining the receiver test channel, main channel and the antenna feeder system, transmission power. The imperfections and improving method of CINRAD/SB echo intensity calibration technique is explored to provide reference and technical support for new generation of weather radars. -
[1] 潘新民, 汤志亚.天气雷达接收功率标定的检验方法探讨.气象, 2002, 28(4):34-37. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200204007.htm [2] 王立轩, 葛润生, 秦勇, 等.新一代天气雷达的自动标校技术.气象科技, 2001, 29(3):27-29. http://www.cnki.com.cn/Article/CJFDTOTAL-QXKJ200103004.htm [3] 黄晓, 裴罛.CINRAD/CB脉冲多普勒天气雷达数字中频接收机.气象科技, 2005, 33(5):465-467. http://www.cnki.com.cn/Article/CJFDTOTAL-QXKJ200505017.htm [4] 王志武, 蔡作金, 周宽宏, 等.CINRAD/S-RDA定标常见问题分析.气象科技, 2008, 36(3):349-351. [5] 刘小东, 柴秀梅, 张维全, 等.新一代天气雷达检修的技术与方法.气象科技, 2006, 34(增刊):113-114. http://www.cnki.com.cn/Article/CJFDTOTAL-QXKJ2006S1025.htm [6] 张沛源, 周海光, 梁海河, 等.数字化天气雷达定标中应注意的一些问题.气象, 2001, 27(6):27-32. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX200106004.htm [7] 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.气象科技, 2007, 35(3):418-421. http://www.cnki.com.cn/Article/CJFDTOTAL-QXKJ200703025.htm [8] 王致君, 楚荣忠.X波段双通道同时收发式多普勒偏振天气雷达.高原气象, 2007, 26(1):135-136. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200701015.htm [9] 胡志群, 刘黎平, 肖艳姣.降水粒子空间取向对双线偏振雷达观测影响模拟研究.应用气象学报, 2008, 19(3):362-365. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20080359&flag=1 [10] 赵恒轩, 陈钟荣, 周枫.天气雷达反射率因子的实时衰减订正.高原气象, 2003, 22(4):335-336. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200304008.htm [11] 赵坤, 陈建军, 方德贤, 等.数字天气雷达虚拟终端的硬件和软件设计.高原气象, 2006, 25(2):336-337. http://www.cnki.com.cn/Article/CJFDTOTAL-GYQX200602021.htm [12] 窦贤康, 刘万栓.机载雷达定量测雨中雨滴谱参数的优化.应用气象学报, 1999, 10(3):293-294. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=19990371&flag=1 [13] 刘黎平, 葛润生.中国气象科学研究院雷达气象研究50年.应用气象学报, 2006, 17(6):682-687. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=200606117&flag=1 [14] 王红艳, 刘黎平, 王改利, 等.多普勒天气雷达三维数字组网系统开发及应用.应用气象学报, 2009, 20(2):222-223. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20090211&flag=1 [15] 葛润生, 朱晓燕.提高多普勒天气雷达晴空探测能力的一种方法.应用气象学报, 2000, 11(3):261-263. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20000340&flag=1 [16] 张培昌, 杜秉玉, 戴铁丕.雷达气象学.北京:气象出版社, 2001:84-87.