US5111209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Satellite-based position determining system
Assignee: Sony Corp
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Filing: 1991-05-20
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Granted: 1992-05-05
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Expires: 2011-05-20
Abstract
Abstract Disclosed herein is a transmission system for determining a position of a mobile station by using communication satellites. The determination of the position of the mobile station is effected by one-line signal transmission from the mobile station through one satellite to a fixed station and by two-line signal transmission from the fixed station through two satellites to the mobile station. Thus, the construction of the transmission system can be made simple such that a transmitter for the one-line signal transmission needs to be mounted on the mobile station.
Inventors
- 👤 Ichiro Toriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:35
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/87; G01S13/878
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
228 words
A system for determining a position of a mobile station, comprising: means incorporated in said mobile station for transmitting a position determination signal from said mobile station through a first geostationary satellite to a fixed station; means incorporated in said fixed station for receiving said position determination signal; means incorporated in said fixed station for transmitting a first reference signal through said first geostationary satellite to said mobile station; means incorporated in said fixed station for transmitting a second reference signal through a second geostationary satellite to said mobile station; means incorporated in said mobile station for receiving said first reference signal; means incorporated in said mobile station for receiving said second reference signal; means incorporated in said mobile station for measuring a first period of time from a transmitting timing of said position determination signal to a receiving timing of said first reference signal and measuring a second period of time from the transmitting timing of said position determination signal to a receiving timing of said second reference signal; said transmitting means incorporated in said mobile station transmitting information of said first and second periods of time measured above through said first geostationary satellite to said fixed station; and means incorporated in said fixed station for computing the position of said mobile station according to the information of said first and second periods of time transmitted above.
Claim 2
Independent Claim
228 words
A system for determining a position of a mobile station, comprising: means incorporated in said mobile station for transmitting a position determination signal from said mobile station through a first geostationary satellite to a fixed station; means incorporated in said fixed station for receiving said position determination signal; means incorporated in said fixed station for transmitting a first reference signal through said first geostationary satellite to said mobile station; means incorporated in said fixed station for transmitting a second reference signal through a second geostationary satellite to said mobile station; means incorporated in said mobile station for receiving said first reference signal; means incorporated in said mobile station for receiving said second reference signal; means incorporated in said mobile station for measuring a first period of time from a transmitting timing of said position determination signal to a receiving timing of said first reference signal and measuring a second period of time from the transmitting timing of said position determination signal to a receiving timing of said second reference signal; said transmitting means incorporated in said mobile station transmitting information of said first and second periods of time measured above through said first geostationary satellite to said fixed station; and means incorporated in said fixed station for computing the position of said mobile station according to the information of said first and second periods of time transmitted above.
Claim 3
Independent Claim
226 words
A method of determining a position of a mobile station, comprising the steps of: transmitting a position determination signal from said mobile station through a first geostationary satellite to a fixed station; receiving said position determination signal in said fixed station; transmitting a first reference signal from said fixed station through said first geostationary satellite to said mobile station after a first predetermined time has elapsed from a receiving timing of said position determination signal; transmitting a second reference signal from said fixed station through a second geostationary satellite to said mobile station after a second predetermined time has elapsed from the receiving timing of said position determination signal; receiving said first reference signal in said mobile station; receiving said second reference signal in said mobile station; measuring a first period of time from a transmitting timing of said position determination signal to a receiving timing of said first reference signal and a second period of time from the transmitting timing of said position determination signal to a receiving timing of said second reference signal, in said mobile station; transmitting information of said first and second periods of time measured above through said first geostationary satellite to said fixed station; and computing the position of said mobile station according to the information of said first and second periods of time transmitted above, in said fixed station.
Claim 4
Independent Claim
226 words
A method of determining a position of a mobile station, comprising the steps of: transmitting a position determination signal from said mobile station through a first geostationary satellite to a fixed station; receiving said position determination signal in said fixed station; transmitting a first reference signal from said fixed station through said first geostationary satellite to said mobile station after a first predetermined time has elapsed from a receiving timing of said position determination signal; transmitting a second reference signal from said fixed station through a second geostationary satellite to said mobile station after a second predetermined time has elapsed from the receiving timing of said position determination signal; receiving said first reference signal in said mobile station; receiving said second reference signal in said mobile station; measuring a first period of time from a transmitting timing of said position determination signal to a receiving timing of said first reference signal and a second period of time from the transmitting timing of said position determination signal to a receiving timing of said second reference signal, in said mobile station; transmitting information of said first and second periods of time measured above through said first geostationary satellite to said fixed station; and computing the position of said mobile station according to the information of said first and second periods of time transmitted above, in said fixed station.
Claim 5
Dependent Claim
44 words
The transmission system as defined in claim 1, wherein said first reference signal contains a predetermined identification signal for identifying transmission through said first geostationary satellite, and said second reference signal contains a predetermined identification signal for identifying transmission through said second geostationary satellite.
References Cited (Backward Citations)
US4918609A
Cited
US5017926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |