Position measuring device and position measuring method by means of GPS
First Claim
1. A position measuring device by means of GPS, the device measuring a three-dimensional position of a moving object based on GPS ranging data obtained at a reference station that is a reference GPS receiver installed on ground and GPS ranging data obtained at an observation station that is an observation GPS receiver disposed on the moving object to be located,the position measuring device comprising multiple solution calculating sections that receive the GPS ranging data from the reference station and the GPS ranging data from the observation station and calculate RTK solutions, including a fixed solution and a float solution, as position data of the observation station according to a real time kinematic (RTK) technique, the solution calculating sections being sequentially restarted at predetermined time intervals,the position measuring device further comprising a solution obtaining unit for receiving the RTK solutions outputted from said solution calculating sections and obtaining an optimum fixed solution;
- the solution obtaining unit comprising;
a number decision section for deciding whether or not the inputted RTK solutions include multiple fixed solutions;
a deviation calculating section for determining, when the number decision section decides that the RTK solutions include multiple fixed solutions, deviations between the fixed solutions; and
an allowable value decision section for deciding whether or not the deviations calculated by the deviation calculating section exceed an allowable value,wherein when the allowable value decision section decides that none of the deviations exceed the allowable value, said optimum fixed solution is obtained based on the fixed solutions,when said number decision section decides that the number of fixed solutions is one, the fixed solution is outputted from the solution obtaining unit; and
when all of the deviations exceed the allowable value in the allowable value decision section, all of the obtained fixed solutions are cancelled.
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Accused Products
Abstract
In a position measuring method, GPS ranging data obtained at a reference station 1 and an observation station 2 is inputted to four solution calculating sections 12, RTK solutions such as a fix solution at the observation station 2 are calculated in the solution calculating sections 12 according to the RTK system, and the RTK solutions are inputted to a solution obtaining unit 13. Further, it is decided whether or not the RTK solutions include multiple fix solutions. When it is decided that the RTK solutions include multiple fix solutions, deviations between the fix solutions are determined and it is decided whether or not the deviations exceed an allowable value. When it is decided that none of the deviations exceed the allowable value, predetermined arithmetic processing is performed on the fix solutions to obtain a normal fix solution. Moreover, the solution calculating sections are sequentially restarted at predetermined time intervals.
8 Citations
8 Claims
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1. A position measuring device by means of GPS, the device measuring a three-dimensional position of a moving object based on GPS ranging data obtained at a reference station that is a reference GPS receiver installed on ground and GPS ranging data obtained at an observation station that is an observation GPS receiver disposed on the moving object to be located,
the position measuring device comprising multiple solution calculating sections that receive the GPS ranging data from the reference station and the GPS ranging data from the observation station and calculate RTK solutions, including a fixed solution and a float solution, as position data of the observation station according to a real time kinematic (RTK) technique, the solution calculating sections being sequentially restarted at predetermined time intervals, the position measuring device further comprising a solution obtaining unit for receiving the RTK solutions outputted from said solution calculating sections and obtaining an optimum fixed solution; the solution obtaining unit comprising; a number decision section for deciding whether or not the inputted RTK solutions include multiple fixed solutions; a deviation calculating section for determining, when the number decision section decides that the RTK solutions include multiple fixed solutions, deviations between the fixed solutions; and an allowable value decision section for deciding whether or not the deviations calculated by the deviation calculating section exceed an allowable value, wherein when the allowable value decision section decides that none of the deviations exceed the allowable value, said optimum fixed solution is obtained based on the fixed solutions, when said number decision section decides that the number of fixed solutions is one, the fixed solution is outputted from the solution obtaining unit; and when all of the deviations exceed the allowable value in the allowable value decision section, all of the obtained fixed solutions are cancelled. - View Dependent Claims (2, 7, 8)
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3. A position measuring method by means of GPS, comprising:
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inputting, to multiple solution calculating sections, GPS ranging data obtained at a reference station that is a reference GPS receiver installed on ground and GPS ranging data obtained at an observation station that is an observation GPS receiver disposed on a moving object to be located; calculating RTK solutions, including a fixed solution and a float solution, as position data of the observation station according to a real time kinematic (RTK) technique in the respective solution calculating sections, the solution calculating sections being sequentially restarted at predetermined time intervals; deciding whether or not the obtained RTK solutions include multiple fixed solutions; determining, when it is decided that the RTK solutions include multiple fixed solutions, deviations between the fixed solutions; deciding whether or not the determined deviations exceed an allowable value; obtaining an optimum fixed solution based on the fixed solutions when it is decided that none of the deviations exceed the allowable value; outputting the fixed solution from a solution obtaining section when it is determined that the number of the fixed solutions is one; and cancelling all the obtained fixed solutions when it is decided that all of the deviations exceed the allowable value. - View Dependent Claims (4, 5, 6)
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Specification
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- Resources
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Current AssigneeHitachi Zosen Corporation
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Original AssigneeHitachi Zosen Corporation
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InventorsMiyake, Toshihide, Yoshida, Haruhiko, Abe, Tomohiro
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Primary Examiner(s)Issing, Gregory C
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Application NumberUS13/061,717Publication NumberTime in Patent Office1,594 DaysField of Search342/357.26, 342/357.27, 342/357.34, 342/357.58US Class Current342/357.26CPC Class CodesG01S 19/43 using carrier phase measure...G01S 19/44 Carrier phase ambiguity res...
