| 摘要 |
PURPOSE:To prevent the generation of a measuring error, by bringing an elevation tracking loop to a closed loop by utilizing the relation of the altitude, distance and speed of a target to AGC voltage. CONSTITUTION:In order to utilize such a characteristic that the point of time for making AGC voltage min. in a tracking apparatus is coincided with the point of time when a positive tracking error becomes max., output of an AGC circuit 11 is inputted to a peak detecting and cycle calculating circuit 12 to calculate a cycle for generating a min. value and the calculated result is inputted to an altitude calculating circuit 13. This circuit 13 calculates altitude on the basis of the target distance information and speed from a distance tracking circuit 3, the speed information from an altitude calculating circuit 10 and the cycle for generating said max. value. In tracking a low altitude target, change-over devices 15, 16 are operated to output the output H of the altitude calculating circuit 13. An antenna elevating angle is calculated on the basis of target distance information and the calculated altitude of the altitude calculating circuit 13 by an elevation calculating circuit 14 and an antenna 1 is controlled by the result thereof. |
