| 摘要 |
PURPOSE:To retrack exactly only a video by a former target by continuing an observatin by an extrapolation forecasting when a tracking target disappears temporarily, also retracking it by using a radar sub-tracking part, deriving the movement data, comparing them with the former movement data to discriminate whether the target is the former target or not. CONSTITUTION:When a target video which has disappeared in the next time appears again in a tracking gate, it is decided that a target exists by a level deciding device 5 of a radar main tracking part 16 and a sub-tracking part 17, and a signal i2 is sent to a deciding part 21. Subsequently, when retracking of the target is started, a calculating part 18 calculates movement data (x) such as a position, speed, acceleration, etc. of the target, basing on a tracking data (w) outputted to a signal processing part 15 from the radar sub-tracking part 17, and these data (x) are compared with the movement data (y) immediately before the video disappears, and only when they are within some allowable range, the target is decided to be the same as the former target. As a result, a retracking permitting pulse (q) is outputted to the main tracking part 16 and a deciding part 21 from a comparator 19. While the pulse (q) is effective, the main tracking part 16 sets the contents of a distance counter 9 to the tracking data (w) of the sub- tracking part 17, makes the tracking gate position of the main tracking part conform to that of the sub-tracking part to secure to catch the target. |
