| 摘要 |
A device for eliminating fixed echoes in a pulse radar. The device is provided with a demodulator unit where intermediate frequency signals of the radar are demodulated into video-frequency signals. The video-frequency signals are utilized in a utilizing unit provided with a display unit. A processing unit of the video-frequency signals is connected between the demodulator means and the utilizing unit. The processing unit is constituted with a range unit sampling circuit, a Doppler filtering unit and a video-frequency signal dynamic compressing unit connected in series. The processing unit is further provided with, on the one hand, a video-frequency signal amplitude measuring circuit for measuring at least the video amplitude signal in two range units in the same transmission recurrence and, on the other hand, with a dynamic compression control unit as a function of these amplitude, the video-frequency signal amplitude measuring circuit and the dynamic compression control unit being series connected upstream the Doppler filtering unit.
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