Location finding system, using reflected radio frequency or...

Details Location finding system, using reflected radio frequency or... Location finding system, using reflected radio frequency or...

2006-10-31

2006-10-31

Hellner, Mark (Department: 3663)

Communications, electrical: acoustic wave systems and devices

Echo systems

C367S117000, C342S444000, C342S465000

Reexamination Certificate

active

07130243

ABSTRACT:
A method of locating one or more reflectors in an environment crowded with reflectors. A transmitter and multiple receivers are used to obtain reflected signals. Each path of a reflected signal is defined by an ellipse having the transmitter at one focus and a receiver at the other. A reflector is assumed to lie on the ellipse, and an intersection of ellipses is assumed to be a reflector location. The region is iteratively divided into smaller and smaller cells, and a search algorithm is performed to determine whether a given point in each cell lies on an ellipse. A “solution” is a point that lies on the same number of ellipses as the number of receivers.

REFERENCES:
patent: 6822604 (2004-11-01), Hall et al.
patent: 6882315 (2005-04-01), Richley et al.

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