| 摘要 |
A transmitter (20), such as a travelling wave tube, is excited at a recurrence frequency of 50 kHz, by a carrier frequency selected at random from among various synthesised frequencies spaced by 50 MHz over a range of 600 MHz, for example the antenna 10 receives echoes which, after compensation for the frequency agility, are subjected to phase rotation (60) on the basis of the carrier frequency which gave rise to them. Processing means TC then carry out coherent integration on each of the channels included having undergone one of the phase rotations. <IMAGE>
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