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FIRE CONTROL SYSTEM

  • US 3,694,095 A
  • Filed: 08/05/1970
  • Issued: 09/26/1972
  • Est. Priority Date: 08/05/1970
  • Status: Expired due to Term
First Claim
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1. A system for determining the correct lead angle of an intercepting craft with respect to a target and for determining and indicating the lead angle error of said craft, the system comprising:

  • a boresight reticle mounted on said craft;

    a first mirror positioned transversely with respect to the sighting axis of the boresight reticle, and at an inclined angle thereto, to receive the image of said target and to reflect it athwart the axis of the boresight reticle;

    a second mirror positioned in the path of the axis of the boresight reticle and in the reflection path of the target image reflected from the first mirror to reflect said target image substantially along the boresight reticle axis;

    means for determining and providing range and angle data indicative of the range and of the angle of said target with respect to said boresight reticle axis at a plurality of instants in time;

    computing means responsive to said range and angle data to compute the actual lead angle and the correct lead angle between said boresight reticle axis and said target and to produce signals indicative of correct lead angle and of lead angle error;

    mounting means connected to the first mirror for permitting the first mirror to rotate about a first axis positioned in the plane of said second mirror and lying along a line normal to the plane of the reflection path of the target image and for permitting the first mirror to rotate about a second axis positioned in the plane of the first mirror and parallel to said first axis of rotation;

    mounting means connected to said second mirror for holding said second mirror in a fixed position with respect to the axis of the boresight reticle;

    positioning means for receiving the correct lead angle signal and for responding thereto to rotate the first mirror about the second axis by an angular amount corresponding to a parameter of the correct lead angle signal and effective for placing the target image in the center of the boresight reticle when the intercepting craft has assumed a heading giving the correct lead angle; and

    positioning means for receiving the lead angle error signal and for responding thereto to rotate the first mirror about the first axis by an angular amount corresponding to a parameter of the lead angle error signal and effective for displacing the target image away from the center of the boresight reticle in an amount and direction indicative of the size and direction of lead angle error of the intercepting craft.

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