Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-04-30
1999-07-27
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
701213, G01S 502, H04B 7185
Patent
active
059298065
ABSTRACT:
Signals comprising time of transmission indications relative to a common time base (302) are transmitted by at least two fixed transceivers (110-116). When the signals are received by a mobile unit (160), a time of reception indication relative to the common time base is calculated for each signal. Pseudo-ranges are calculated based on the time of transmission and time of reception indications, and a WLS solution location estimate is calculated based on the pseudo-ranges. Essentially the same procedure may be performed on signals transmitted by the mobile unit. Given the common time base between the fixed transceivers and the mobile unit, only two or more signals are required to determine the location estimate. Where GPS receivers are used to supply the common time base, location determinations can still be made when a GPS solution is unavailable.
REFERENCES:
patent: 5202829 (1993-04-01), Geier
patent: 5416712 (1995-05-01), Geier et al.
patent: 5436632 (1995-07-01), Sheynblat
patent: 5525998 (1996-06-01), Geier
patent: 5736960 (1998-04-01), Murphy et al.
Birchler Mark A.
Jones Debra A.
Oros Nicholas C.
Haas Kenneth A.
Hellner Mark
Motorola Inc.
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