Accurate position measuring system
First Claim
1. An accurate position measuring system comprising:
- a communication satellite for performing data transmissions;
a position measuring satellite for transmitting position measurement data necessary for position measurement calculations;
a plurality of position reference stations for receiving the position measurement data from said position measuring satellite to calculate their own station positions, for calculating positional error information on the basis of their own station positioning, and for transmitting the positional error information;
a network station for collecting the positional error information transmitted from the plurality of position reference stations to prepare wide-area positional error information, and for transmitting the wide-area positional error information to said communication satellite; and
a position measuring device for receiving the position measurement data from said position measuring satellite to calculate its own position, and for receiving the wide-area positional error information transmitted from said network station through said communication satellite to correct its own calculated position using the wide-area positional error information.
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Accused Products
Abstract
An accurate position measuring system includes a communication satellite, a position measuring satellite, a position reference station, a network management station and a position measuring device. The communication satellite performs data communication. The position measuring satellite transmits position measurement data necessary for a position measurement calculation. The position reference station receives the position measurement data from the position measuring satellite and calculates positional error information. The calculated positional error information is transmitted to a network management station. The network management station collects the positional error information transmitted from the position reference station and transmits the collected positional error information to the communication satellite. The position measuring device receives the position measurement data from the position measuring satellite and calculates its current position. The position measuring device further receives the positional error information transmitted from the network management station through the communication satellite and corrects the calculated position information by means of the received positional error information.
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Citations
27 Claims
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1. An accurate position measuring system comprising:
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a communication satellite for performing data transmissions; a position measuring satellite for transmitting position measurement data necessary for position measurement calculations; a plurality of position reference stations for receiving the position measurement data from said position measuring satellite to calculate their own station positions, for calculating positional error information on the basis of their own station positioning, and for transmitting the positional error information; a network station for collecting the positional error information transmitted from the plurality of position reference stations to prepare wide-area positional error information, and for transmitting the wide-area positional error information to said communication satellite; and a position measuring device for receiving the position measurement data from said position measuring satellite to calculate its own position, and for receiving the wide-area positional error information transmitted from said network station through said communication satellite to correct its own calculated position using the wide-area positional error information. - View Dependent Claims (2, 3, 4, 5, 6, 15, 16, 17)
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7. A position measuring device for use in an accurate position measuring system which includes a communication satellite for transmission, a position measuring satellite for transmitting position measurement data necessary for position measurement calculations, a plurality of position reference stations for receiving the position measurement data from said position measuring satellite to calculate their own station positions and for calculating positional error information on the basis of their own station positions and for transmitting the positional error information, and a network station for collecting the positional error information transmitted from the plurality of position reference stations to prepare wide-area positional error information and for transmitting the wide-area positional error information to said communication satellite, and said position measuring device, wherein said position measuring device comprises:
position measuring means for receiving the position measurement data from said position measuring satellite and calculating the position of said position measuring device, receiving means for receiving the wide-area positional error information from said communication satellite, and calculation means for correcting the calculated position of said position measuring device using the wide-area positional error information. - View Dependent Claims (8)
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9. A position reference station for use in an accurate position measuring system which includes a communication satellite for performing data communication, a position measuring satellite for transmitting position measurement data necessary for position measurement calculations, said position reference station, at least one further position reference station, a network station for collecting positional error information transmitted from the position reference stations to prepare wide-area positional error information and transmitting the wide-area positioned error information to said communication satellite, and a position measuring device for receiving the position measurement data from said position measuring satellite to calculate its own position and receiving the wide-area positional error information transmitted from said network station through said communication satellite to corrects its own position using the wide-area positional error information, wherein said position reference station comprises:
position measuring means for receiving the position measurement data and calculating its own station position, memory means for storing its own accurate station position previously, calculation means for calculating the positional error information on the basis of its own station position calculated by said position measuring means and its own station position stored in said memory means, and transmission means for transmitting the positional error information calculated by said calculation means to said network station. - View Dependent Claims (10, 11, 12)
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13. A network station for use in an accurate position measuring system which includes a communication satellite for performing data transmission, a position measuring satellite for transmitting position measurement data necessary for position measurement calculations, a plurality of position reference stations for receiving the position measurement data from said position measuring satellite to calculate their own station positions and for calculating positional error information on the basis of their own station positions and for transmitting the positional error information, said network station, and a position measuring device for receiving the position measurement data from said position measuring satellite to calculate its own position and for receiving wide-area positional error information transmitted through said communication satellite to correct its own position by using the wide-area positional error information, wherein said network station comprises:
receiving means for receiving the positional error information transmitted by the plurality of position reference stations, memory means for storing area information corresponding to the positional error information received by said receiving means, calculation means for adding the area information stored in said memory means to each positional error information to prepare the wide-area positional error information, and transmission means for transmitting the wide-area positional error information prepared by said calculation means to said communication satellite.
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14. A navigation apparatus for use in an accurate position measuring system which includes a communication satellite for performing data transmission, a position measuring satellite for transmitting position measurement data necessary for position measurement calculations, a plurality of position reference stations for receiving the position measurement data from said position measuring satellite to calculate their own station positions and for calculating positional error information on the basis of their own station positions and for transmitting the positional error information, a network station for collecting the positional error information transmitted from the plurality of position reference stations to prepare wide-area positional error information and for transmitting the wide-area positional error information to said communication satellite, and said navigation apparatus, wherein said navigation apparatus comprises:
position measuring means for receiving the position measurement data to calculate the position of said navigation apparatus, receiving means for receiving the wide-area positional error information from said communication satellite, calculation means for using the wide-area positional error information to correct the calculated position of said navigation apparatus, memory means for storing map data, display means for displaying the map data, and control means for reading out pertinent map data for the corrected position determined by said calculation means from said memory means to display the map data onto said display unit.
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18. A navigation apparatus for use in an accurate position measuring system which includes a communication satellite for performing data transmission, a position measuring satellite for transmitting position measurement data necessary for position measurement calculations, a plurality of position reference stations for receiving the position measurement data from said position measuring satellite to calculate their own station positions and for calculating positional error information including area information indicative of application areas on the basis of their own positions and for transmitting the calculated positional error information, said network station, and a position measuring device for receiving the position measurement data from said position measuring satellite to calculate its own position and for receiving the wide-area positional error information transmitted through said communication satellite to correct its own position by using the wide-area positional error information, wherein said network station comprises:
receiving means for receiving the positional error information from the plurality of position reference stations, calculation means for collecting the positional error information to prepare the wide-area positional error information, and transmission means for transmitting the wide-area positional error information prepared by said calculation means to said communication satellite. - View Dependent Claims (19, 20)
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21. An accurate position measuring system for use with position measuring satellites which transmits position measurement data necessary for position measurement calculations, comprising:
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means for receiving position measurement data at a first location that is known, the first locating lying in a first area; means for calculating a first calculated position from the position measurement data received at the first location and for determining a first positional error between the first calculated position and the first location; means for adding area information to the first positional error, the area information that is added to the first positional error identifying the first area; means for receiving position measurement data at a second location that is known, the second location lying in a second area; means for calculating a second calculated position from the position measurement data received at the second location and for determining a second positional error between the second calculated position and the second location; means for adding area information to the second positional error, the area information that is added to the second positional error identifying the second area; means for combining the first and second positional errors with added area information to provide combined correction information; and means for transmitting the combined correction information into the first and second areas. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification