| 摘要 |
A logarithmetic sidelobe blanking system operable in a pulse compression radar system in which the dynamic range of the blanking system is not limited by the compression dynamic range. A sidelobe blanking receiver is provided to process the sidelobe signals in a manner identical to the processing in the radar receiver. The uncompressed IF pulses in both the sidelobe receiver and the main lobe receiver are sampled prior to their being amplitude limited, and are applied through logarithmetic amplifiers whose dynamic range capability is at least equal to the dynamic range of the preceding circuits. The output signals of the logarithmetic amplifiers are then compared and if the sidelobe signal is larger than the main lobe signal the compressed pulse at the output of the pulse compressor is located and used for blanking to ensure that only the time interval of the compressed pulse width is removed. As sampling is made prior to the threshold or amplitude limiting circuit, the full dynamic range of the receiver is processed. The sidelobe receiver system in accordance with the invention also includes an arrangement for selecting the above described sampling prior to threshold operation when the input signal is limited and for selecting operation with normal sidelobe blanking comparison of compressed sidelobe signals when the input signal is at a level lower than the limiting amplitude of the channels.
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