| 摘要 |
In a method for searching, selecting and tracking targets in a given range, utilizing a radar set having a range gate, two successive and contiguous gating pulses are generated responsive to transmission of each radar pulse, and have a duration and position, relative to the radar pulse, corresponding to the target area to be covered so as to contain all echo pulses resulting from the radar pulse. The two gating pulses are displaced, in time, relative to the echo pulses in a time direction such that each gating pulse contains the same content of echo pulse energy or, alternatively speaking, so that the echo pulse having the maximum amplitude is evenly divided between the two gating pulses and centered on the separation line therebetween. The durations of the gating pulses are then decreased, either continuously or stepwise, so that the combined duration is substantially equal to the duration of the echo pulse having the maximum amplitude, while both gating pulses are displaced, in time, relative to this pulse so that the echo pulse remains centered on the separation line between the two gating pulses. The apparatus includes a differential amplifier, a sawtooth wave generator, a comparator and at least one pair of pulse circuits, with the sawtooth generator being triggered by the radar pulse transmitter. |
