The Method of CINRAD/SB Radar Echo Intensity Calibration and Adjustment

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.