Positioning system and method
First Claim
1. An interior positioning system comprising:
- positional data regarding the physical position of at least four pseudosatellites;
a clock unit for providing an accurate clock signal;
a computer for calculating pseudosatellite data derived from the positional data and the clock signal; and
a transmitter in communication to the computer for transmitting a pseudosatellite data signals derived from the pseudosatellite data.
1 Assignment
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Accused Products
Abstract
A positioning system for locating objects in places where standard Global Position System signals do not penetrate. A first embodiment uses a GPS receiver and a clock recovery unit. A computer receives the positional information and accurate time information. The computer calculates new orbital data for at least four pseudosatellites. The pseudosatellites are antennas positioned in an interior or shielded space and function to send pseudosatellite data to a receiver. In a second embodiment, the positions of the pseudosatellites are provided to the computer without the use of a GPS receiver. An accurate clock signal is also provided. The computer calculates orbital data for each pseudosatellite and transmits the time signal and ephemeris data for each pseudosatellite. The time signal is delayed for each pseudosatellite to account for propagation delays due to different connecting cable lengths.
143 Citations
5 Claims
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1. An interior positioning system comprising:
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positional data regarding the physical position of at least four pseudosatellites; a clock unit for providing an accurate clock signal; a computer for calculating pseudosatellite data derived from the positional data and the clock signal; and a transmitter in communication to the computer for transmitting a pseudosatellite data signals derived from the pseudosatellite data. - View Dependent Claims (2, 3, 4)
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5. A method for providing an interior positioning system comprising:
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providing positional information regarding at least four pseudosatellites; providing an accurate time signal; calculating pseudosatellite data for each pseudosatellite by using the position information; transmitting the pseudosatellite data and the accurate time signal, said transmitting of the accurate time signal being delayed for each pseudosatellite to account for propagation delay.
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Specification