| 摘要 |
PURPOSE:To perform precise tracking, by forecasting a target position and deciding on a correct target direction, and specifying a driving command value and widening the response band width of a fine movement mirror system. CONSTITUTION:A light wave sensor 2 detects reflected light from a target, and an error in the azimuth and elevation components of the optical axis of a tracking device against the target direction are detected through a picture signal processing part 5. Those errors, and servo frame angles from a servo driving frame and driving system 11, and a receiving optical part 12 are summed up by an adder 9a, and a target-position forecasting arithmetic part 21 forecasts the target position, setting the optical axis of a main mirror 13 in the target direction even in a transient state. Further, the fine movement mirror and driving system 15 of the optical part 12 are controlled according to the servo frame tracking error of an adder 9b based upon the forecasted command angle and servo driving frame angle deviation from the arithmetic part 21 to allow the optical part to follow up with good responsibility in a wide band up to a high frequency band by frame follow-up delay. Thus, light wave tracking precision is improved. |
