| 摘要 |
For use in a fire control system, a target search and track system to which approximate azimuth and elevation information of the position of a searched target is applied, when the system is in a search mode. The information is used to cause a pointing mirror to point to the target, so that infrared energy is received therefrom, and is reflected to an infrared tracker receiver. Once infrared energy from tee target is received, the system is switched to a track mode in which the position of the pointing mirror is controlled by error signals from the receiver. The receiver includes a detector array and an oscillating, of scanning mirror which, initially, is controlled to scan the array in a wide-angle coarse track mode, in which the array is scanned over a relatively large field of view. When the target is detected near the center of the receiver field of view, the receiver is switched to a small-angle fine track mode, in which the array of detectors is scanned over a much smaller field of view, so that the receiver provides a much higher rate of pointing mirror positioning signals. The positions of the pointing mirror, about two orthogonal axes of rotation, are encoded to provide tracked target azimuth and elevation information, which is supplied to a fire control computer. A laser rangefinder is incorporated, which uses the accurately positioned pointing mirror to reflect laser light to the target and receive laser light, which is reflected by the target back to the system. The laser rangefinder provides the tracked target range information.
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