On April 2016 19-24, a calibration experiment based on corner reflector was carried out in field test zipengshan in Feixi County of Hefei city. The experiment had accomplished the calibration of airborne millimeterwave cloud radar under the condition of static ground. According to calibration data, the root mean square error of corner reflector strength measurement values between the reflector and the theoretical value is 0.182dB and 0.197dB in standard mode (pulse width is 0.33 s) and enhanced mode (pulse width is 1.32 s) respectively. All these pave the way for the further study of the external calibration experiments under the condition of clear sky sea.
The millimeter-wave cloud radar can provide a large number of fine and reliable information for the inversion of cloud macro and micro parameters. A key link of using the millimeter-wave cloud radar to detect the cloud is that the radar must be calibrated. Due to the precision components and severe environment of millimeter-wave cloud radar, subtle changes may take place in the operation process of cloud radar, unless the cloud radar is calibrated regularly. Although the calibration system inside the cloud radar can track and monitor the main working parameters and correct the detection results, it fails to consider the characteristics of the antenna and the mutual influence among different components of cloud radar. Therefore, the external calibration for cloud radar system is very important. Combined with the actual situation of cloud radar under domestic onboard platform, this paper builds a complete external calibration technique process of cloud radar based on the calm sea, providing the theoretical support for the external calibration experiments of the airborne and even satellite-borne millimeter-wave cloud radar developed by our country.
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