With the application of radar to observations of the atmosphere, various weather phenomena and winds in the clear atmosphere can be monitored and mapped in real time. We have developed various atmospheric and meteorological radars of transmitted frequencies between 50-MHz band and 300-THz band including coherent lidars development in cooperation with various research institutes. Polarimetric Doppler radars from 5-GHz to 35-GHz equip lower peak power transmitters and pulse compression functions, and perform equivalent observation performance with high peak power radars.
The 35-GHz radar is an excellent tool to observe cloud and fog whose particle sizes are far small than that associated with precipitation. MELCO first developed the single polarization 35-GHz magnetron Doppler radar in cooperation with Kyoto University and NIED, independently. The new one which adopts an EIK for the transmitter and pulse compression technique in dual polarization are ongoing by the instruction of Nagoya University and NIED. Its observation sensitivity becomes higher about 10 dB or more than the legacy one.
In laser frequency band, we have developed the long range lidar. Our target to develop the lidar is to realize the world s best performance, i.e., the longest observation range. To actualize our aim, we have developed the planar waveguide amplifier which is a high gain, high power, and reliable amplifier. The newest field observation result shows the observable range of more than 30 km in no precipitation condition.
With the combination of above mentioned sensors, e.g., the integrated system composed of the 9-GHz, 35-GHz radars and the long range lidar, we can precisely observe formative, intensifying, matured, and dissipating stages of clouds and precipitation. Great progress in understanding weather and the dynamics of the atmosphere will be made using these radars with new observational discoveries.