Since dual polarization function, improved data quality by adopting polarized data. The transmitter uses a transmitter module that incorporates a solid-state element, eliminating the need for periodic replacement of the transmitter tube (klystron) unlike conventional types. The transmission device consists of multiple transmission modules, and transmission modules can be replaced without stopping operation. Equipped with data processing to prevent deterioration of data quality even when transmission output fluctuates. Even if either horizontal polarization or vertical polarization data cannot be obtained, operation can be continued using data that can be output. Realized an observation sequence that enables low-level windshear information to be output every minute. Process airport weather Doppler lidar data that can grasp wind movement even without precipitation, and output low-level windshear information in the same way as DRAW.