System and method for passively ascertaining a relative...

Details System and method for passively ascertaining a relative... System and method for passively ascertaining a relative...

2007-10-30

2007-10-30

Alsomiri, Isam (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S139040, C356S432000

Reexamination Certificate

active

11270969

ABSTRACT:
A system and method for determining whether the distance between an electromagnetic-energy emitting source and a predetermined location increased, decreased or remained constant between first and second times relies upon the selection of first and second energy bands whose average wavelengths are disparately absorbed as a function of transmission distance. Energy values corresponding to the intensity of detectable energy within each of the first and second sub-ranges at each of the first and second times are assigned. First and second ratios comparatively indicative of the intensity of energy detected, as represented by the assigned relative-energy values, within the first and second sub-ranges at each of the first and second times are computed and, based on a ratio-comparative analysis of the first and second ratios, a determination as to a direction of change in transmission distance is rendered by reference to modeled data associating, directly or indirectly, expected ratio-comparative relationships with an increase, decrease and lack of change in distance.

REFERENCES:
patent: 6594000 (2003-07-01), Green et al.
patent: 6995846 (2006-02-01), Kalayeh et al.
patent: 2002/0180951 (2002-12-01), Benz et al.
patent: 2004/0130702 (2004-07-01), Jupp et al.
patent: 2007/0109528 (2007-05-01), Caldwell et al.
patent: 489546 (1992-06-01), None

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