Code-space optical electronic distance meter

Details Code-space optical electronic distance meter Code-space optical electronic distance meter

1998-07-08

2000-02-29

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 51, 356 505, 356 515, 342145, G01C 308

Patent

active

060316012

ABSTRACT:
An electronic distance meter comprises an integrated circuit from a GPS navigation receiver having a local pseudo-random number code generator for code demodulation that is connected to modulate either a polychromatic or a monochromatic light source. An optical system focuses the light on a distant target with an unknown range. Reflections from the distant target are focused on a light detector that produces a phase-delayed copy of the original pseudo-random number code. The time-of-flight to and back from the distant target is a function of the distance. The GPS receiver integrated circuit computes the range based on the code-phase delay to a precision better than one centimeter. The position of a remote target can be triangulated from several electronic distance meters each having known positions, e.g., determined by included GPS navigation receivers. Conversely, the position of a single electronic distance meter can be determined by triangulation by ranging to several remote targets each having known positions.

REFERENCES:
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patent: 3802780 (1974-04-01), Helm et al.
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patent: 5026156 (1991-06-01), Bayston et al.
patent: 5077557 (1991-12-01), Ingensand
patent: 5117232 (1992-05-01), Cantwell
patent: 5175557 (1992-12-01), King et al.
patent: 5233357 (1993-08-01), Ingensand et al.
patent: 5311149 (1994-05-01), Wagner et al.

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