G - Physics – 01 – S
Patent
G - Physics
01
S
343/61
G01S 7/28 (2006.01)
Patent
CA 1096019
9th July 1980 Abstract: Pulse radar apparatus, provided with a transmitter and receiver, which receiver is utilised for the suppression of noise and/or continuous-wave interference signals during the reception of target returns, and which receiver thereto comprises: a. a first and a second transmission channel responsive to directional and omnidirectional reception respectively of signals composed of target returns and of noise and/or continuous- wave interference signals, both channels being suitable for intermediate-frequency detection of the received signals; b. an interference canceller connected to the two transmission channels for the supply of target returns, which canceller contains a subtraction circuit and a phase and amplitude compensating network generating - after the supply of output signals from the subtraction circuit and from the second transmission channel - output signals for the subtraction circuit, which output signals are equal in phase and amplitude to the signals derived from the first transmission channel and applied to the subtraction circuit, in so far the output signals of the first transmission channel are weaker than those of the second transmission channel. According to the invention, each transmission channel comprises a compression amplifier whose amplitude transfer characteristic approximates y(t)={x(t)}.alpha. where 0 < .alpha. < 1, while x(t) represents the amplifier input signal obtained by intermediate-frequency detection in the respective channel, and y(t) the output signal of the respective transmission channel.
274476
Koops Geert
Zwarts Johan M. C.
Fetherstonhaugh & Co.
Hollandse Signaalapparaten B.v.
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