Inclination sensor

• US 9,605,962 B2
• Filed: 08/07/2013
• Issued: 03/28/2017
• Est. Priority Date: 08/08/2012
• Status: Active Grant

• Current Assignee: Hexagon Technology Center GmbH (Hexagon AB)
• Original Assignee: Hexagon Technology Center GmbH (Hexagon AB)
• Inventors: Jordil, Pascal
• Primary Examiner(s): GUADALUPE, YARITZA
• Application Number:
  US14/420,322
• Publication Number:
  US 20150219455A1
• Time in Patent Office: 1,329 Days
• Field of Search: 332/90, 332/28
• US Class Current: 1/1
• CPC Class Codes: G01C 15/00 Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
• CPC Class Codes: G01C 15/008 combined with inclination sensor
• CPC Class Codes: G01C 9/00 Measuring inclination, e.g. by clinometers, by levels
• CPC Class Codes: G01C 9/14 movable in more than one direction

Abstract

Some embodiments of the invention relate to an inclination sensor for determining an inclination of an object with respect to a reference vector of a reference coordinate system. The inclination sensor may include a tilt detector for determining gravity vector data of a local gravity vector, and a calculation unit comprising means for providing, based on the position data, position-related vertical deflection data, the vertical deflection data comprising information about a relation between the local gravity vector and the reference vector, and calculation means for calculating reference vector data based on the vertical deflection data and on the gravity vector data, wherein an inclination of the object with respect to the reference vector is derivable from the reference vector data, to a surveying system comprising such an inclination sensor and to a method for determining the inclination of the object with respect to the reference vector.

Claims

1. An inclination sensor for determining an inclination of an object with respect to a reference vector of a reference coordinate system, the inclination sensor comprising:

a tilt detector for determining gravity vector data of a local gravity vector;

a position determination device for determining a position of the tilt detector and generating position data corresponding to the position of the tilt detector; and

a calculation unit comprising;

means for providing, based on the position data, position-related vertical deflection data, the vertical deflection data comprising information about a relation between the local gravity vector and the reference vector, and

calculation means for calculating reference vector data based on the vertical deflection data and on the gravity vector data,

wherein an inclination of the object with respect to the reference vector is derivable from the reference vector data.

2. The inclination sensor according to claim 1, wherein:

the means for providing position-related vertical deflection data comprise;

storing means that are adapted for storing a set of position-related vertical deflection data and for providing position-related vertical deflection data out of the stored set according to the position data, and/or

communication means for establishing a data connection with a remote server, sending position data to the remote server and receiving position-related vertical deflection data from a data base of the remote server,

wherein the calculation unit is adapted for at least one of;

selection of position-related vertical deflection data for a determined position, and

deduction of vertical deflection data for a determined position, the deduction being based on vertical deflection data related to at least two distinct positions.

3. The inclination sensor according to claim 1, wherein:

the gravity vector data comprises a tilt of the object with respect to the local gravity vector.

4. The inclination sensor according to claim 1, wherein:

the vertical deflection data comprises an angle (a) between the local gravity vector and the reference vector and/or a value of the local gravitational acceleration.

5. The inclination sensor according to claim 1, wherein:

the position determination device comprises receiver means and the position determining device is adapted for at least one of the following;

use with a GNSS system;

receiving signals from satellites and/or radio masts;

detecting the position of the tilt detector by means of triangulation radiolocation,

deducing position information from a signal of local wireless communication network;

determining a position of the tilt detector at least with a 50% circular error probability of less than 50 meters, and

generating position data and providing the position data to the calculation unit.

6. The inclination sensor according to claim 5, wherein:

determining a position of the tilt detector at least with a 50% circular error probability of less than 50 meters comprises determining a position of the tilt detector at least with a 50% circular error probability of less than 20 meters.

7. The inclination sensor according to claim 5, wherein:

deducing position information from a signal of local wireless communication network comprises deducing position information from a signal of a WLAN.

8. A surveying system for measuring distances and/or spatial coordinates, comprising the inclination sensor according to claim 1 and at least one of following:

a survey pole;

a geodetic surveying device;

a self-levelling laser measurement device; and

a hand-held probe or a machine control sensor for use with a laser tracker.

9. The surveying system according to claim 8, wherein the self-leveling laser measurement device comprises at least one of a point laser, a line laser, a grade laser, and a pipe laser.

10. The surveying system according to claim 8, wherein the geodetic surveying device comprises a total station or a theodolite.

11. The surveying system according to claim 8, wherein the survey pole comprises:

a rigid, rod-shaped body having a pointed tip for contacting a measuring point on the ground, the body defining a pole axis;

retro-reflector means, being positioned on the body at a known position relative to the tip;

a tilt detector for detecting a tilt of the pole axis with respect to a local gravity vector; and

a position determination device for determining a position of the survey pole,

wherein the survey pole comprises a calculation unit for;

providing position-related vertical deflection data according to the determined position of the survey pole, the position-related vertical deflection data comprising information about the direction of the local gravity vector relative to a reference vector of a reference coordinate system, and

calculating reference vector data based on the detected tilt of the pole axis with respect to the direction of the local gravity vector and on the position-related vertical deflection data,

wherein an inclination of the pole axis with respect to the reference vector is derivable from the reference vector data.

12. The surveying system according to claim 8, comprising a geodetic surveying device and a survey pole, the geodetic surveying device being adapted to detect a distance and direction to the survey pole, the survey pole comprising:

a rigid, rod-shaped body having a pointed tip for contacting a measuring point on the ground, the body defining a pole axis,

retro-reflector means, wherein the retro-reflector means are positioned on the body at a known position relative to the tip and

a tilt detector for detecting a tilt of the pole axis with respect to a local gravity vector,

the geodetic surveying device comprising;

a base defining a vertical axis,

a support tiltable around the vertical axis,

a telescope unit tiltable around the vertical axis and around a horizontal axis that is orthogonal to the vertical axis and comprising means for distance measurement,

angle determination means for detecting an orientation of the telescope unit with respect to the base and

a position determination device for detecting a position of the geodetic surveying device and for generating position data corresponding to the position of the geodetic surveying device, wherein;

a calculation unit for;

deducing a position of the survey pole from the position of the geodetic surveying device and the distance and direction to the survey pole,

providing position-related vertical deflection data according to the position of the survey pole, the vertical deflection data comprising information about a relation between the local gravity vector and a reference vector of a reference coordinate system, and

calculating reference vector data based on the detected tilt of the pole axis with respect to the direction of the local gravity vector and on the vertical deflection data,

wherein an inclination of the pole axis with respect to the reference vector is derivable from the reference vector data.

13. The surveying system according to claim 8, wherein:

the survey pole and the geodetic surveying device are connected by means of wireless data transfer means,

wherein gravity vector data of a local gravity vector is determinable by the tilt detector and transferable via the wireless data transfer means to the calculation unit.

14. The surveying system according to claim 13, wherein:

the data transfer means comprises at least one of a Bluetooth connection, a wireless local area network, a radio link, and an infrared connection.

15. A method for determining an inclination of an object with respect to a reference vector of a reference coordinate system, the method comprising:

determining a tilt of the object with respect to a local gravity vector;

determining a position of the object;

providing gravity vector data based on the determined tilt and position-related vertical deflection data for the determined position, the vertical deflection data comprising information about a relation between the local gravity vector and the reference vector;

calculating reference vector data based on the gravity vector data and on the vertical deflection data, and

deriving an inclination of the object with respect to the reference vector from the reference vector data.

16. The method according to claim 15, further comprising:

displaying the inclination of the object with respect to the reference vector to a user.

17. The method according to claim 15, further comprising:

transmitting the reference vector data and/or the inclination of the object with respect to the reference vector to an external measurement device for determining a position of the object with respect to the reference coordinate system.

18. The method according to claim 15, wherein:

continuously determining a tilt of the object with respect to a local gravity vector,

continuously providing gravity vector data based on the determined tilt, and

continuously calculating reference vector data based on the gravity vector data and on the vertical deflection data.

19. The method according to claim 15, wherein:

determining the position of the object comprises at least one of;

determining a position of a reference object having means for determining a distance and direction to the object, wherein the reference object is a geodetic surveying device;

selecting, based on the position data, vertical deflection data for the determined position of the object out of a stored set of position-related vertical deflection data; and

deducing, based on the position data and on vertical deflection data related to at least two distinct positions, vertical deflection data for the determined position of the object.

20. The method according to claim 15, wherein providing position-related vertical deflection data comprises:

establishing a data connection with a remote server, sending position data to the remote server and receiving position-related vertical deflection data from a data base of the remote server.

21. A non-transitory computer program product, comprising program code which is stored on a machine-readable medium comprising a program code segment, having computer-executable instructions for performing the method of claim 15.