Multi-Beam Pattern Measurement of the MU Radar Antenna by Satellite OHZORA

After finishing a series of tests, an antenna pattern monitoring system for the MU radar using satellite OHZORA has been put into the operational stage. We describe a multi-beam measurement technique, with which about 10 of the various MU radar antenna patterns can be measured simultaneously in one pass of the satellite, to make the best use of the limited number of chances for experiments. We also show the results of a preliminary attempt to synthesize a three-dimensional antenna pattern by integrating the data for different satellite passes.