| 摘要 |
PROBLEM TO BE SOLVED: To achieve automatic tracking even when the receiving electric field levels of a plurality of tracking radiators installed in one parabolic antenna are lower than an electric field level necessary for the comparison of a detection voltage. SOLUTION: Since signals received by two right and left tracking radiators 3a, 3b are synthesized by a synthesizer 5a through right and left phase shifters 4a, 4b and the phase shift amounts of the right and left phase shifters 4a, 4b are varied so that a detection value obtained by detecting the synthetic signal by a detector 6a is maximized, detection based on a double-sized signal is achieved as compared with the case for detecting a signal outputted from one tracking radiator in the same condition. As compared with a method for estimating a radio wave arriving direction by an output signal from one tracking radiator while alternately switching two tracking radiators, therefore, automatic tracking reception is achieved even by a radio wave of a receiving electric field level of about a half of strength. COPYRIGHT: (C)2010,JPO&INPIT |
