METHOD FOR ELIMINATION OF CHAFF ECHOES IN REFLECTIVITY COMPOSITE FROM AN OPERATIONAL WEATHER RADAR NETWORK USING INFRARED SATELLITE DATA

摘要

PURPOSE: A chaff echo removal method of operational meteorological radar reflectivity composite using satellite infrared image data is provided to manage radar observation data and to offer a very accurate short term meteorological forecast. CONSTITUTION: Brightness temperature color index data of a satellite infrared image is collected in real time in a plurality of radar observation networks and a meteorological satellite(S201,S202). A radar reflectivity composite image is generated from the collected radar observation data(S203) and resolution of the radar reflectivity composite image is converted to the same as the satellite infrared image(S204). To coincide the satellite infrared image with the central coordinate of the radar reflectivity composite image, the central point is converted(S205). Only the satellite infrared image in the observation range of the radar is stored, the satellite infrared image out of the observation range of the radar is processed as a null, and the satellite infrared image is converted to coincide with the radar observation radius(S206). The value of the radar reflectivity composite image corresponding to the grid point having a smaller color index than the brightness temperature color index threshold of the satellite infrared image is removed from the radar reflectivity composite image(S209). The radar reflectivity composite image, from which a chaff echo is removed, is generated(S210). [Reference numerals] (AA) Start; (BB) End; (S201) Collecting radar observation data in real time; (S202) Collecting brightness temperature(T_B) color index data of a satellite infrared image in real time; (S203) Generating a radar reflectivity composite image; (S204) Converting the resolution of the radar reflectivity composite image; (S205) Coinciding the central lattice point of the satellite infrared image with the radar reflectivity composite image; (S206) Coinciding the satellite infrared image with the observation range of the radar reflectivity composite image; (S207) Comparing brightness temperature color index data of a satellite infrared image in the most adjacent time zone to the converted radar reflectivity composite image; (S208) T_B color index of a predetermined lattice point in the satellite infrared image < T_B color index ?; (S209) Removing a lattice point with a color index value smaller than a critical brightness temperature(T_B) color index value from the radar reflectivity composite image; (S210) Generating a radar reflectivity composite image from which a chaff echo is removed