Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-10-12
1990-10-23
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250332, 358 95, G01C 308, H04N 700
Patent
active
049647210
ABSTRACT:
A novel timing control method is utilized in conjunction with an imaging lidar system of the type disclosed in U.S. Pat. No. 4,862,257. This novel timing control is employed in applications wherein the lidar system is mounted on an airborne platform. The timing control method of this invention completely eliminates the glint detector with associated signal conditioner used in the system of U.S. Pat. No. 4,862,257, and instead, relies upon a signal derived from the aircraft altimeter to continually provide platform altitude status. Since the entire system is under the control of a computer, the altimeter signal can be interpreted and used to adjust total delay so as to automatically track changing platform altitude. It is now possible to initiate all timing from the occurrence of the laser "lamp fire" signal. The total delay to camera "gate on" is now the "lamp-to-laser" delay, plus round trip platform altitude delay (computer from the altimeter signal), plus desired water depth delay, less system delays.
REFERENCES:
patent: 3446555 (1969-05-01), Kahn
patent: 3527533 (1970-09-01), Hook et al.
patent: 3604803 (1971-09-01), Kahn
patent: 3848999 (1974-11-01), Dall'armi
patent: 4862257 (1989-08-01), Ulich
Calmes Lonnie K.
Elkins William P.
Ulich Bobby L.
Buczinski Stephen C.
Kaman Aerospace Corporation
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