Receiver with fixed-echo suppressor
AssigneeThomson-CSF
InventorGuy Lepere
Life of this patent
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Abstract
A receiver of a pulse-type radar has a main i-f channel feeding a fixed-echo suppressor of limited dynamic range and, in parallel therewith, an ancillary channel of extended dynamic range including a logarithmic amplifier and a processor. The latter averages the amplitude of incoming echo signals over a range-and-azimuth cell and then over one or more antenna revolutions. The resulting mean value of the signal amplitude is used to control the gain of a linear amplifier in the main channel so as to adapt the dynamic range of the echo signals to that which can be handled by the fixed-echo suppressor.
Claims8
In a radar system comprising a signal receiver with a main channel, feeding a fixed-echo suppressor of limited dynamic range, and with an ancillary channel of extended dynamic range, said channels receiving incoming echo signals from a rotating antenna periodically emitting outgoing pulses, said main channel including amplitude-adjusting means responsive to a control signal from said ancillar channel,
- the improvement wherein said ancillary channel comprises logical circuitry responsive to synchronization and antenna-position signals for dividing the area swept by the radar into a predetermined number of range-and-azimuth cells each encompassing a plurality of pulse-repetition cycles, first integrating means controlled by said logical circuitry for averaging the amplitudes of said incoming echo signals over each one of said cells, second integrating means in cascade with said first integrating means for averaging over at least one antenna revolution the mean amplitude values thus obtained for each cell to generate a resulting amplitude value, and evaluating means downstream of said second integrating means for deriving said control signal from said resulting amplitude value.
Dependencies are inferred from the claim text.