Dual gated agc radar

Claim 1

A dual gated AGC radar receiver for minimizing countdown type jamming comprising mixer means receiving a radar return echo signal, said radar return echo signal being normal in one instance and having a jamming signal imposed thereupon in another instance preamplifier means receiving the output signal from said mixer, said preamplifier means being arranged to receive an automatic gain control voltage signal, a normal signal channel, a jamming signal channel, each of said channels receiving the output signal from said preamplifier, said normal signal including in a first series arrangement an IF amplifier also arranged to receive an automatic gain control voltage signal, and a boxcar detector, said jamming signal channel including in a second series arrangement a receiver and a gate generator, said gate generator providing a rectangular output signal, a normal AGC path, a jamming AGC path, each of said paths being adjusted to provide output voltage signals of identical amplitude, each of said paths having a series arrangement of a sample and hold integrator, an amplifier, and an electronic switch, each of said sample and hold integrators and electronic switches receiving said rectangular output signal for control purposes, in normal operation said sample and hold integrator of said normal AGC path being arranged to sample and said electronic switch therein to pass a signal therethrough, simultaneously said sample and hold integrator of said jamming AGC path being arranged to hold and said electronic switch therein to be open, in jamming, said rectangular output signal controls said sample and hold integrator of said jamming AGC path to sample and said electronic switch therein to pass a signal therethrough, simultaneously said sample and hold integrator of said normal AGC path holds and said electronic switch therein opens, and means to interconnect said electronic switches with said IF amplifier and said preamplifier for gain control purposes.