Electromagnetic detection receiver

Claim 2

A receiver for a moving monopulse radar system comprising means for supplying the sum signal Sigma , and a M.T.I system comprising a coherent wave generator, and a phase detector having a reference input coupled to said generator and an echo input coupled to said signal Sigma supplying means, said radar receiver further comprising, between said signal Sigma supplying means and said detector echo input, means for modifying the phase of echoes originating from the same target, fed to said echo input, by an amount proportional to the angle between the direction from which said echoes originate and the radar beam axis, so that the phase variation over at least one radar repetition period between successive so modified echo sum signals originating from the same target is equal to that between nonmodified successive echoes of a target located on the beam axis.

Claim 3

A receiver according to claim 1, wherein said modifying means comprise phase shifting means having a signal input coupled to said signal Sigma supplying means, a control input, and an output coupled to said detector echo input, and means, for elaborating a signal representative of said amount, having an output coupled to said control input.

Claim 4

A receiver according to claim 2, comprising a radar displacement velocity Vc signal input, a radar beam axis elevation angle S signal input, and a radar beam axis bearing angle G signal input, and a circuit elaborating signal Delta G Delta / Sigma , where Delta is the monopulse difference signal, said circuit having an output, wherein said means for elaborating the signal representative of said amount comprise computing means, having respective inputs coupled to said Vc input, to said S input, and to said G input, and an output supplying a signal representative of the product Vc . cos S . sin G, integrating means having an input coupled to said computing means output and an output and multiplying means having a first input coupled to said Delta G input, a second input coupled to said integrating means output and an output coupled to said phase shifter control input.

Claim 5

A receiver according to claim 3, wherein, said radar system having a synchronization system, said integrating means comprises a reset input coupled to said synchronization system.

Claim 6

A receiver according to claim 1, comprising at least one signal Delta output, where Delta is a monopulses difference signal, wherein said modifying means comprise adding means having a first input coupled to said signal Sigma supplying means, a second input, and an output coupled to said detector echo input, means having an input coupled to said signal Delta output, and an output coupled to said adding means second input, for supplying thereto a signal proportional to signal Delta , and pi /2 phase shifting means in series with one of said adding means input.

Claim 7

A receiver according to claim 5, comprising a radar displacement velocity Vc signal input, a radar beam axis elevation angle S signal input, and a radar beam axis bearing angle G signal input, wherein said means coupled to said adding means second input comprise computing means having respective inputs coupled to said Vc, S and G inputs, and an output supplying a signal representative of the product Vc . cos S . sin G, integrating means having an input coupled to said last output and an output, and multiplying means having two inputs rEspectively coupled to said last output and to said Delta output, and an output coupled to said second input of said adding means.

Claim 8

A receiver according to claim 6, wherein, said radar system having a synchronization system, said integrating means comprises a reset input coupled to said synchronization system.