Mobile unit's position measurement apparatus and mobile unit's position measurement method
First Claim
1. A mobile unit'"'"'s position measurement apparatus comprising:
- a reception portion that receives signals from a plurality of satellites;
an observation data selection portionthat calculates a plurality of estimated error values that correspond respectively to a plurality of pieces of observation data obtained by observing the signals received by the reception portion,that generates groups, each of which includes estimated error values corresponding to at least a predetermined number of satellites, andthen extracts, from the estimated error value groups generated, estimated error value groups in which a difference between a maximum value and a minimum value of the estimated error values included is less than a predetermined value, andthat consequently selects pieces of observation data provided by the signals from the satellites that correspond to the estimated error values that are included in an estimated error value group whose standard deviation of the estimated error values is smallest among the estimated error value groups extracted; and
a positioning computation portion that performs a positioning computation based on the pieces of observation data selected by the observation data selection portion.
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Abstract
A mobile unit'"'"'s position measurement apparatus is provided. The apparatus includes an observation data selection portion that calculates a plurality of estimated error values that correspond respectively to the plurality of pieces of observation data obtained by observing the signals received by the reception portion, that generates groups each of which includes estimated error values corresponding to at least a predetermined number of satellites, and then extracts, from the estimated error value groups generated, in which a difference between a maximum value and a minimum value of the estimated error values included is less than a predetermined value, and that consequently selects pieces of observation data provided by the signals from the satellites that correspond to the estimated error values that are included in an estimated error value group whose standard deviation of the estimated error values is smallest among the estimated error value groups extracted.
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Citations
13 Claims
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1. A mobile unit'"'"'s position measurement apparatus comprising:
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a reception portion that receives signals from a plurality of satellites; an observation data selection portion that calculates a plurality of estimated error values that correspond respectively to a plurality of pieces of observation data obtained by observing the signals received by the reception portion, that generates groups, each of which includes estimated error values corresponding to at least a predetermined number of satellites, and then extracts, from the estimated error value groups generated, estimated error value groups in which a difference between a maximum value and a minimum value of the estimated error values included is less than a predetermined value, and that consequently selects pieces of observation data provided by the signals from the satellites that correspond to the estimated error values that are included in an estimated error value group whose standard deviation of the estimated error values is smallest among the estimated error value groups extracted; and a positioning computation portion that performs a positioning computation based on the pieces of observation data selected by the observation data selection portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A mobile unit'"'"'s position measurement method comprising:
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calculating a plurality of estimated error values that correspond respectively to a plurality of pieces of observation data that are obtained by observing signals transmitted from a plurality of satellites; generating groups, each of which includes estimated error values corresponding to at least a predetermined number of satellites;
thenextracting, from the estimated error value groups generated, estimated error value groups in which a difference between a maximum value and a minimum value of the estimated error values included is less than a predetermined value; and
thenselecting pieces of observation data provided by the signals from the satellites that correspond to the estimated error values that are included in an estimated error value group whose standard deviation of the estimated error values is smallest among the estimated error value groups extracted; and performing a positioning computation based on the at least one or all of the pieces of observation data selected.
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Specification