| 摘要 |
PURPOSE:To track the intermediate point between targets such as a satellite through a single antenna by detecting a tracking error signal as to plural frequency signals radiated by plural targets, and performing arithmetic for automatic tracking on the basis of the signal. CONSTITUTION:Frequency signals f1 and f2 radiated by stationary satellites A and B are received by an antenna 1. Then, the sum signal St and difference signal Sd of the frequency signals f1 and f2 are separated by a branching filter feeding device 2 and inputted to amplifiers 3 and 5 respectively. The amplitude sum signal St and difference signal Sd are inputted to tracking error detecting devices 6 and 7. The detecting devices 6 and 7 detects a tracking error from the sum signal and difference signal on the basis of the frequency signals f1 and f2. An azimuth error signal DELTASAZ and an elevation error signal DELTASEL are calculated and inputted to a tracking servo mechanism 10 to allow the antenna 1 to track the intermediate point between the satellites A and B. Thus, the intermediate point between the targets is tracked, so plural targets are tracked through one antenna. |
