Satellite-based position determining system
First Claim
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1. 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.
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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.
93 Citations
3 Claims
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1. A system for determining a position of a mobile station, comprising:
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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. - View Dependent Claims (3)
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2. A method of determining a position of a mobile station, comprising the steps of:
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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.
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Specification