Displacement detecting device for structural object, sharing system of displacement of structural object, and method and program of detecting displacement of structural object
A displacement detecting device for a structural object is capable of accurately measuring displacement of the structural object. The displacement detecting device includes first and second attitude data calculators, a data extractor, and a displacement calculator. The first attitude data calculator calculates attitude data at a first position by using received positioning signals, and calculates a calculated time point of the attitude data of the first position based on a time of a positioning system. The second attitude data calculator calculates attitude data at a second position by using received positioning signals, and calculates a calculated time point of the attitude data of the second position based on the time of the positioning system. The displacement calculator calculates a displacement amount and a displacement direction of the structural object by using a difference between the attitude data of the first and second positions calculated at the same time point.
1. A displacement detecting device for a structural object, comprising:
a first attitude data calculator:
disposed with two first antennas at a first position of the structural object,
configured to calculate a first base line vector between the two first antennas by using received positioning signals,
configured to calculate first attitude data of the first position based on an angle formed by three perpendicular axes in an absolute coordinate system and the first base line vector, and
configured to acquire a time point of the first attitude data of the first position based on a time of a positioning system;
a second attitude data calculator:
disposed with two second antennas at a second position of the structural object,
configured to calculate a second base line vector between the two second antennas by using received positioning signals,
configured to calculate second attitude data of the second position based on an angle formed by the three perpendicular axes in an absolute coordinate system and the second base line vector, and
configured to acquire a time point of the second attitude data of the second position based on the time of the positioning system;
a data extractor:
configured to compare the time point of the first attitude data and the time point of the second attitude data and determine that they are the same, and
configured to extract the first attitude data and the second attitude data based on the comparison; and
a displacement calculator configured to calculate a displacement amount and a displacement direction of the structural object by using a difference between the first attitude data and the second attitude data.
2. The displacement detecting device for the structural object of claim 1 , wherein the first attitude data calculator calculates a displacement vector of an attitude with respect to a reference attitude at the first position, as the first attitude data, and
wherein the second attitude data calculator calculates a displacement vector of an attitude with respect to a reference attitude at the second position, as the second attitude data.
3. The displacement detecting device for the structural object of claim 2 , wherein the displacement calculator detects whether displacement of the structural object exists, based on the displacement amount and the displacement direction of the structural object.
4. The displacement detecting device for the structural object of claim 3 , wherein the displacement calculator detects a kind of the displacement of the structural object based on the displacement amount and the displacement direction of the structural object.
5. The displacement detecting device for the structural object of claim 4 , wherein the displacement of the structural object is at least one of torsion, bending and sway of the structural object.
6. The displacement detecting device for the structural object of claim 5 , wherein the displacement calculator stores the displacement amount and the displacement direction of the structural object over a given period of time, and then detects an aged deterioration of the structural object based on a time change of the displacement amount and the displacement direction of the structural object.
7. A sharing system of displacement of a structural object, comprising the displacement detecting device for the structural object of claim 6 , wherein the displacement detecting device is one of a plurality of displacement detecting devices,
wherein the plurality of displacement detecting devices are disposed in different regions that are separated from each other, and
wherein one of the displacement detecting devices, upon detecting displacement, transmits the detected displacement and a detected time point of the displacement based on the time of the positioning system to the other displacement detecting devices.
8. The displacement detecting device for the structural object of claim 1 , wherein the displacement calculator detects whether displacement of the structural object exists, based on the displacement amount and the displacement direction of the structural object.
9. The displacement detecting device for the structural object of claim 8 , wherein the displacement calculator detects a kind of the displacement of the structural object based on the displacement amount and the displacement direction of the structural object.
10. The displacement detecting device for the structural object of claim 9 , wherein the displacement of the structural object is at least one of torsion, bending and sway of the structural object.
11. The displacement detecting device for the structural object of claim 8 , wherein the displacement calculator stores the displacement amount and the displacement direction of the structural object over a given period of time, and then detects an aged deterioration of the structural object based on a time change of the displacement amount and the displacement direction of the structural object.
12. A sharing system of displacement of a structural object, comprising the displacement detecting device for the structural object of claim 1 , wherein the displacement detecting device is one of a plurality of displacement detecting devices,
wherein the plurality of displacement detecting devices are disposed in different regions that are separated from each other, and
wherein one of the displacement detecting devices, upon detecting displacement, transmits the detected displacement and a detected time point of the displacement based on the time of the positioning system to the other displacement detecting devices.
13. A method of detecting displacement of a structural object, comprising: disposing two first antennas at a first position of the structural object, calculating a first base line vector between the two first antennas by using received positioning signals, calculating first attitude data of the first position based on an angle formed by three perpendicular axes in an absolute coordinate system and the first base line vector, and acquiring a time point of the first attitude data based on a time of a positioning system;
disposing two second antennas at a second position of the structural object, calculating a second base line vector between the two second antennas by using received positioning signals, calculating second attitude data of the second position based on an angle formed by three perpendicular axes in an absolute coordinate system and the second base line vector, and acquiring a time point of the second attitude data based on the time of the positioning system;
comparing the time point of the first attitude data and the time point of the second attitude data and determine that they are the same;
extracting the first attitude data and the second attitude data, based on the comparison; and
calculating a displacement amount and a displacement direction of the structural object by using a difference between the first attitude and the second attitude data.