气象学报Issue(3)：577-592,16.DOI:10.11676/qxxb2015.039
C波段调频连续波天气雷达探测系统及观测试验
The C-band FMCW pointing weather radar system and its observa-tion experiment
摘要
Abstract
The C-band Frequency Modulation Continuous Wave (C-FMCW)vertically pointing radar was developed with a new-ly signal processing technology.The C-FMCW radar uses the two-dimensional FFT signal processing technology,with the lowest detectable echo power of -170 dBm,and the quantitative calibration is difficult for weak signal.For a standard signal source analog echo point frequency,its frequency signal is able to be broadened to the signal with the same scanning range as the radar system,to get the calibration curve with the minimum input power up to -169.77 dBm,in which the calibration curve inflection point is able to confirm that the radar noise power is about -168 dBm.The spectral density of reflectivity can be computed from the spectrum of quantitative calibration.The data observed from the C-FMCW radar are compared with the SA scanning radar on Dingyuan,Anhui Province from June of 2013.The comparison analysis uses the data from the 48 km and 83 km CINRAD/SA Bengbu and Hefei radar,respectively,for the August 24 precipitation event.This event includes the two stages with convective cloud and stratiform cloud respectively.The reflectivity vertical distributions in the stratiform cloud for the C-FMCW radar and CINRAD/SA weather radar are basically in agreement,showing that the calculation of the C-FMCW radar system is reasonable.The average difference between the C-FMCW radar and SA radar in Bengbu in terms of the root mean square difference is 1.75 dB,and that between it and the Hefei SA radar is 2.02 dB.A preliminary analysis using the products and the spectral density of reflectivity,shows that the C-FMCW radar has a good prospect in the identification for the different particle phase thickness in precipitation cloud body,the study of echoes in the boundary layer of the clear atmosphere. And,it can also help to recognize the strong variations of vertical motion in the severe rain clouds.关键词
C波段调频连续波天气雷达/定量标校/数据比对/降水云探测Key words
C band frequency modulation continuous wave (FMCW)radar/Radar quantitative calibration/Reflectivity compar-ison analysis/Precipitation cloud detection capability分类
天文与地球科学引用本文复制引用
阮征,金龙,葛润生,李丰,吴俊..C波段调频连续波天气雷达探测系统及观测试验[J].气象学报,2015,(3):577-592,16.基金项目
资助课题国家自然科学基金项目（41075023）、公益类行业（气象）科研专项（GYHY201306004、GYHY201306040）、中国气象科学研究院灾害天气国家重点实验室自主研究项目。 （）
