Sector gating circuit

Claim 2

In a circuit for discriminating against signals from extraneous targets received by a tracking device in which the planes of direction finding are rotated, such as the seeker of a rolling missile, the combination comprising: a. a first input terminal for receiving target signals from one channel of a target seeker, b. a second input terminal for receiving target signals from another channel of said target seeker, c. roll rate circuit means for producing delayed signals synchronized to the roll of said missile, d. first gate circuit means for passing signals received at said first input terminal when signals present at said second input terminal are at a null and being responsive to the delayed signal of said roll rate circuit means for blocking signals received at said first circuit means, e. second gate circuit means for passing signals received at said second input terminal when signals present at said first input terminal are at a null and being responsive to the delayed signals of said roll rate circuit means for blocking signals received at said second circuit means.

Claim 3

The circuit of claim 1 wherein said first and second circuit means are first and second gated amplifiers respectively.

Claim 4

The circuit of claim 2 wherein a null detector is coupled between said second input terminal and said first gated amplifier for gating said first gated amplifier on in response to a null condition in said null detector.

Claim 5

The circuit of claim 3 wherein circuit control means are coupled to said first gated amplifier for turning off said first gated amplifier in response to an output signal from said first gated amplifier that has been time delayed by a predetermined amount.

Claim 6

The circuit of claim 1 wherein said first and second circuit means comprise: a. a first gated amplifier having a first input coupled to said first input terminal, second and third inputs, and an output, b. a first null detector coupled between said second input terminal and the second input of said first gated amplifier, c. a first fixed delay circuit having an input coupled to the output of said first gated amplifier and having an output, d. a first bistable multivibrator having a first input coupled to the output of said first fixed delay, a second input and an output coupled to the third input of said first gated amplifier, e. roll rate detector means having an output proportional to the rate of rolling of said missile, f. first variable delay means having a first input coupled to said roll rate detector means, a second input and an output coupled to the second input of said first bistable multivibrator, g. a second gated amplifier having a first input coupled to said second input terminal, second and third inputs and an output, h. a second null detector coupled between said first input terminal and the second input of said second gated amplifier, i. a second fixed delay circuit having an input coupled to the output of said second gated amplifier and having an output coupled to the second input of said first variable delay means, j. a second bistable multivibrator having a first input coupled to the output of said second fixed delay, a second input and an output coupled to the third input of said second gated amplifier, k. second variable delay means having a first input coupled to said roll rate detector means, a second input coupled to the output of said first fixed delay circuit and an output coupled to the second input of said second bistable multivibrator.