| 摘要 |
A first, fixed mirror is placed in the path of light passing to a boresight reticle and inclined at an angle to the boresight axis. A second mirror is positioned transversely to said boresight axis and reflects the image of a target to the first mirror and thence along the boresight axis to the boresight reticle. The second mirror is rotatable about two axes, the first axis lying in the plane of the first mirror and intersecting said boresight axis at a right angle, and the second axis lying in the plane of the second mirror and parallel to the first axis. Computing means are provided to determine the desired (correct) lead angle, the actual lead angle and the lead angle error between the intercepting aircraft and the target, and to produce signals indicative of the error. Means are provided for receiving the error signals and for responding thereto to rotate said second mirror about its second axis to center the target image on the boresight reticle when the actual lead angle is equal to the correct lead angle and to rotate said second mirror about its first axis to displace the target image with respect to the boresight reticle to indicate the amount and direction of the lead angle error.
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