| 摘要 |
PURPOSE:To prevent the interruption of speed tracking, by changing over PRF directly before the receiving signal from a moving object is contained in the inhibiting zone of a clutter canceller. CONSTITUTION:The first PRF transmission pulse from a transmitter 1 is sampled in the same frequency as PRF through a transmission and reception change- over device 2, an antenna 3, a moving object, the change-over device 2 and a receiver 4 and digitized to be inputted to a clutter canceller 5. When a PRF change-over device 7 detects a state directly before the receiving signal from the moving object is contained in the inhibiting zone of the canceller 5, an order for performing transmission by second PRF is imparted to the transmitter 1. Second PRF is prescribed by formula I to the accelerated object and by formula II to the decelerated object. In the formulae I , II, FP is a second PRF value, Bc is the width of the inhibiting zone of the clutter canceller 5 in second PRF, BT is the zone width of the receiving signal from the moving object in second PRF and N is a positive integer. |
