| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem, wherein it is necessary that a receiving phase difference is 2°or below per 1°of target azimuth change to have limits on direction finder precision, as a result allowing±90°of an azimuth range to correspond to a phase difference within±180°so as not to generate azimuth ambiguity (a plurality of azimuths are calculated from one phase difference information) in a direction finder region (azimuth range of±90°) in the conventional phase difference direction finder system in a target azimuth calculating device for receiving incoming radio waves from targets and calculate the target azimuth. SOLUTION: In addition to an azimuth calculation means (precision system) due to conventional phase difference direction finder systems, the target azimuth calculating device detects the phase difference due to a micro-Doppler frequency difference in the signals received with two antenna elements after a delay line is passed and increased, and includes a roughing system for performing right and left determination of target azimuth. As a result, the effect for obtaining direction finder accuracy for the two times of the conventional phase difference direction finder system is taken. COPYRIGHT: (C)2011,JPO&INPIT |
