Positioning system and fixed station and positioning apparatus for employing the same
First Claim
1. A positioning system comprising:
- a fixed station for generating DGPS data including correction data for satellite transmission information transmitted from artificial satellites and adjustment state identification information for indicating a state of adjustment error assignment, said DGPS data being based on said artificial satellite transmission information and an absolute position that is known in advance, said correction data containing at least one of pseudorange correction data and range-rate correction data; and
a mobile station for detecting its own position based on said artificial satellite transmission information and said DGPS data that is transmitted from said fixed station, whereinsaid fixed station assigns a predetermined adjustment error to said correction data and then transmits said DGPS data; and
said mobile station corrects said correction data based on the received DGPS data.
1 Assignment
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Accused Products
Abstract
DGPS data obtained from an FM broadcast wave is extracted by a DGPS data extraction section (226). Adjustment error, the accuracy of which is not very high, has been appended to correction data to be used in actual positioning correction within the obtained DGPS data. A correction value creation section (228) judges, from the contents of DGPS data, which data in a correction value table (230) may be read. The method of this judgment is predetermined. Then, the correction value is created by reading the corresponding correction value from correction value table (230). Next, the correction value and correction data are added in a DGPS data specifying section (232) to yield proper correction data. Position information having high accuracy can be obtained from the obtained proper correction data.
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Citations
16 Claims
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1. A positioning system comprising:
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a fixed station for generating DGPS data including correction data for satellite transmission information transmitted from artificial satellites and adjustment state identification information for indicating a state of adjustment error assignment, said DGPS data being based on said artificial satellite transmission information and an absolute position that is known in advance, said correction data containing at least one of pseudorange correction data and range-rate correction data; and a mobile station for detecting its own position based on said artificial satellite transmission information and said DGPS data that is transmitted from said fixed station, wherein said fixed station assigns a predetermined adjustment error to said correction data and then transmits said DGPS data; and said mobile station corrects said correction data based on the received DGPS data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fixed station apparatus for a positioning system using satellite transmission information transmitted from artificial satellites, said fixed station apparatus comprising:
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a position detection apparatus for detecting its own position by receiving said artificial satellite transmission information; and a DGPS creation apparatus for creating DGPS data including correction data for various satellite transmission information based on its own absolute position known in advance and its own position obtained from said position detection apparatus and for adjusting the value of said correction data by assigning a predetermined adjustment error, said correction data containing at least one of pseudorange correction data and range-rate correction data. - View Dependent Claims (9, 10, 11)
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12. A positioning apparatus for a positioning system using satellite transmission information transmitted from artificial satellites, said positioning apparatus comprising:
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a position detection apparatus for detecting its own position based on said artificial satellite transmission information; a DGPS data creation apparatus for receiving DGPS data transmitted from a fixed terrestrial station, said received DGPS data including correction data for satellite transmission and adiustment state identification information for indicating a state of adjustment error assignment, said correction data containing at least one of pseudorange correction data and range-rate correction data; and a correction data correction apparatus for correcting said received correction data in a predetermined manner, wherein said position detection apparatus corrects, based on correction data that was corrected by said correction data correction apparatus, its own position that was detected according to said artificial satellite transmission information. - View Dependent Claims (13, 14, 15, 16)
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Specification