Method of locating object using phase differences among...

Details Method of locating object using phase differences among... Method of locating object using phase differences among...

2006-11-07

2006-11-07

Phan, Dao L. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

C342S464000

Reexamination Certificate

active

07132981

ABSTRACT:
A technique for geolocating (mobile) objects within an environment where other locating systems, such as GPS-based systems, may not be expected to operate successfully, uses at least three transmitter sites whose geolocations are fixed and known, and which transmit dual frequency beacons that are readily received by a mobile receiver within the environment of interest. The object's receiver processes the three sets of received signals by measuring the phase differences among respective pairs of the beacons, and then processes these phase differences to perform time difference of arrival-based or time of arrival-based distance information to locate the object relative to the beacons sites. Phase errors or offsets are readily calibrated out, to realize geolocation information at the mobile receiver.

REFERENCES:
patent: 4028703 (1977-06-01), Honore et al.
patent: 4060809 (1977-11-01), Baghdady
patent: 6275705 (2001-08-01), Drane et al.
patent: 2002/0126046 (2002-09-01), Counselman et al.
patent: 2005/0206555 (2005-09-01), Bridgelall et al.

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