Positioning apparatus
First Claim
1. A positioning apparatus comprising:
- a first radio wave receiving means for receiving electric waves sent from satellites;
a second radio wave receiving means for receiving pseudo distances between said satellites and a reference station;
a correlation value output means for calculating correlations between pseudo pattern codes of said satellites and the electric waves received by said first radio wave receiving means, and for outputting correlation values indicating the correlations;
a peak value detection meansfor setting up an effective range for each of the correlation values outputted from said correlation value output means on a basis of a pseudo distance between said satellites and said reference station, andfor detecting a peak value which falls within the effective range based on a difference between the pseudo distances received by the second radio wave receiving means; and
a positioning means for determining a current position from peak values detected by said peak value detection means.
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Accused Products
Abstract
A positioning apparatus includes a correlator 30 for calculating a correlation between the pseudo pattern code of each of satellites 1 and 2 and each of SPS signals associated with the satellites 1 and 2, and for outputting a correlation value indicating the correlation, sets up effective ranges δ1 and δ2 for the correlation values outputted from the correlator 30 on the basis of a pseudo distance PR1 between the satellite 1 and a SPS reference station 4, and a pseudo distance PR2 between the satellite 2 and the SPS reference station 4, and detects peak values which fall within the effective ranges δ1 and δ2, respectively. As a result, the positioning apparatus can determine the current position correctly even under a receiving environment in which the electric waves directly from the satellites 1 and 2 may become weak.
9 Citations
15 Claims
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1. A positioning apparatus comprising:
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a first radio wave receiving means for receiving electric waves sent from satellites; a second radio wave receiving means for receiving pseudo distances between said satellites and a reference station; a correlation value output means for calculating correlations between pseudo pattern codes of said satellites and the electric waves received by said first radio wave receiving means, and for outputting correlation values indicating the correlations; a peak value detection means for setting up an effective range for each of the correlation values outputted from said correlation value output means on a basis of a pseudo distance between said satellites and said reference station, and for detecting a peak value which falls within the effective range based on a difference between the pseudo distances received by the second radio wave receiving means; and a positioning means for determining a current position from peak values detected by said peak value detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A positioning apparatus comprising:
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a first radio wave receiving means for receiving electric waves sent from satellites; a second radio wave receiving means for receiving pseudo distances between said satellites and a reference station; a correlation value output means for calculating a correlation between each of pseudo pattern codes of said satellites and the electric waves received by said first radio wave receiving means, and for outputting a correlation value indicating the correlation; a peak value detection means for generating a correlation peak pattern on a basis of a pseudo distance between said satellites and said reference station, and for detecting a peak value which falls within the correlation peak pattern based on a difference between the pseudo distances received by the second radio wave receiving means; and a positioning means for determining a current position from the peak value detected by said peak value detection means. - View Dependent Claims (14)
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15. A positioning apparatus comprising:
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a first radio wave receiver configured to receive electric waves sent from satellites; a second radio wave receiver configured to receive pseudo distances between said satellites and a reference station; a correlation value output unit configured to calculate correlations between pseudo pattern codes of said satellites and the electric waves received by said first radio wave receiver, and to output correlation values indicating the correlations; a peak value detection unit configured to set up an effective range for each of the correlation values outputted from said correlation value output unit on a basis of a pseudo distance between said satellites and a reference station, and to detect a peak value which falls within the effective range based on a difference between the pseudo distances received by the second radio wave receiver; and a positioning unit configured to determine a current position from peak values detected by said peak value detection unit.
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Specification