Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1999-04-13
2000-08-22
Tsang, Fan
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455422, 455 676, 342450, 342457, H04Q 720
Patent
active
061085588
ABSTRACT:
Base stations (101, 103, and 105) transmit, and a remote unit (117) receives a radio frequency (RF) location signal. The remote unit (117) then computes an observed-time-difference (OTD) for each base station at particular time t1. Observed differences in received signal times, and are reported to a Mobile Location Center (MLC) (111). Additionally, a Real-Time-Difference receiver (115) receives an RF signal from two or more base stations. The Real Time Differences between the base stations (101, 103, and 105) are computed at a second time. These differences are also reported to the MLC (111). The MLC (111) computes an estimated RTD for the time period t.sub.1 via standard curve fitting algorithms, or simple interpolating algorithms. A corrected Time Difference of Arrival (TDOA) as determined by the remote unit (117) is computed based on the OTD measurements and the estimated RTD measurements.
REFERENCES:
patent: 5512908 (1996-04-01), Herrick
patent: 5600706 (1997-02-01), Dunn et al.
patent: 5666662 (1997-09-01), Shibuya
patent: 5719584 (1998-02-01), Otto
patent: 5815538 (1998-09-01), Grell et al.
patent: 5970414 (1999-10-01), Bi et al.
patent: 6002936 (1999-12-01), Roel-Ng et al.
Haas Kenneth A.
Motorola Inc.
Tran Congvan
Tsang Fan
LandOfFree
Method for calculating a location of a remote Unit utilizing obs does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for calculating a location of a remote Unit utilizing obs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for calculating a location of a remote Unit utilizing obs will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-592291