Method for determining the spatial coordinates of points, applic

Details Method for determining the spatial coordinates of points, applic Method for determining the spatial coordinates of points, applic

1991-10-07

1993-03-02

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, 356152, G01B 1126

Patent

active

051913852

ABSTRACT:
Elements of an optical system are placed at points (A) and the spatial coordinates of these points are measured. The optical system comprises on the one hand an optical device which may be mounted on board an aircraft (2) and on the other hand reflectors (10) such as reflectors of the cube corner type. The optical device includes a pulsed laser source and a detector which is sensitive to the radiation emanating from the laser source. The desired spatial coordinates are determined from measurements of transit times of reflected laser pulses.
The pulses (8) emitted by the laser source are caused to diverge in order to increase the width of their angular field and the radiation reflected from the reflectors (10) is collected in a wide field and transmitted to the detector.
The system is applicable in particular to high-precision topography for the purpose of analyzing land subsidence.

REFERENCES:
patent: 4119379 (1978-10-01), Zindler
patent: 4218138 (1980-08-01), Robertsson
patent: 4225226 (1980-09-01), Davidson et al.
patent: 4277167 (1981-07-01), Eppel
patent: 4494870 (1985-01-01), Hentshel et al.
IEEE Transactions on Geoscience and Remote Sensing, vol. 25, No. 5, Sep., 1987, pp. 581-591 by S. C. Cohen, et al. entitled "The Geoscience Laser Altimetry/Ranging System".
Proc. ESA Workshop on Sapce Laser Applications and Technology, Mar. 26, 1984, Les Diablerets CH, pp. 61-67; R. Schwarte; entitled "Performance Capabilities of Laser Ranging Sensors".
Article entitled "The Airborne Laser Ranging System, Its Capabilities and Applications", by W. D. Kahn, et al., Sep., 1982, Goodard Space Flight Center (Tech Memo 83984).

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