Method and apparatus for navigation guidance

• US 6,140,957 A
• Filed: 02/18/1999
• Issued: 10/31/2000
• Est. Priority Date: 03/12/1998
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Longaker, Harold L., Wilson, Raymond P
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): PHAN, DAO LINDA
• Application Number:
  US09/252,897
• Time in Patent Office: 621 Days
• Field of Search: 342/357.01, 342/357.06, 342/357.08, 342/357.14, 342/357.17, 342/419, 701/213
• US Class Current: 342/357.32
• CPC Class Codes: A61B 5/1112 Global tracking of patients, e.g. by using GPS
• CPC Class Codes: G01C 15/00 Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
• CPC Class Codes: G01S 19/13 Receivers
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]
• CPC Class Codes: G01S 19/43 using carrier phase measurements, e.g. kinematic positioning; using long or short baseline interferometry
• CPC Class Codes: G01S 19/44 Carrier phase ambiguity resolution; Floating ambiguity; LAMBDA [Least-squares AMBiguity Decorrelation Adjustment] method

Abstract

A position identification system, that employs satellite navigational or similar positioning technology is provided. In one embodiment, the position identification system includes a receiver for receiving position signals from a positioning system; an orientation device that is configured to rotate about at least one axis; a pointing element coupled to the orientation device to provide indication of a direction to a desired position; and a processor that is coupled to the receiver to receive the position signals. The processor computes a current position of the position identification system based upon the position signals. The processor directs the orientation device, based upon the current position and the desired position, with the pointing device tracking the direction to the desired position as the current position changes. Using the positioning system, a pointing device is used to identify the direction to the desired location to the user of the positioning system. The positioning system receives a first position corresponding to the desired location. A second position is determined corresponding to the device'"'"'s current location. Then the pointing element is oriented such that the pointing element is substantially aligned with the first position indicating the direction to the desired. The position signals are updated so that, if the device'"'"'s current position changes, the pointing device will track the direction to the desired position.

Claims

1. A position identification system comprising:

a receiver configured to receive position signals from a positioning system;

an orientation device configured to rotate about at least one axis;

a pointing element coupled to the orientation device, the pointing element configured to provide indication of a direction to a desired position; and

processing logic coupled to the receiver to receive the position signals, the processor computing a current position of the position identification system based upon the position signals, the processor directing the orientation device based upon the current position and the desired position, the pointing device tracking the direction to the desired position as the current position changes.

2. The position identification system of claim 1, wherein the processor is further configured to determine bearing values for directing the orientation device.

3. The position identification system of claim 1, wherein the receiver receives Global Positioning System signals.

4. The position identification system of claim 1, wherein the receiver receives Inertial Navigation System signals.

5. The position identification system of claim 1, wherein the receiver receives Global Positioning System signals and Inertial Navigation System signals.

6. The position identification system of claim 1, wherein the pointing element is a laser pointer.

7. The position identification system of claim 1, further comprising a ranging device configured to measure the distance between the position identification system and another point.

8. The position identification system of claim 1, further comprising a second receiver configured to receive correction signals to adjust the position signals.

9. The position identification system of claim 1, wherein the pointing element visually indicates the direction to the desired position on a windshield of a vehicle.

10. The position identification system of claim 6, wherein the laser pointer is configured to illuminate a ground spot near the current position of the position identification system in the direction to the desired position.

11. The position identification system of claim 7, wherein the laser pointer is configured to illuminate a first way when the position identification system is outside a predetermined range and a second way when the position identification system is within a predetermined range.

12. The position identification system of claim 11, wherein the pointing element is a laser diode and wherein the predetermined range is the range of the laser diode.

13. The position identification system of claim 7, further comprising:

an audio device configured to provide an audible signal when the survey device is within a predetermined range.

14. A method of identifying a direction to a desired position to a user of a survey device, the method comprising:

receiving a first position corresponding to the desired position;

determining a second position corresponding to a current position of the survey device;

orienting a pointing element to a first orientation in which the pointing element is substantially aligned with the first and the second positions;

determining a third position corresponding to a new position of the survey device; and

orienting the pointing element to a second orientation in which the pointing element is substantially aligned with the first and the third positions.

15. The method of claim 14, further comprising:

determining the distance between the first position and the third position; and

providing indication of the distance to the desired location.

16. The method of claim 15, further comprising identifying the desired position with the pointing element if the distance is within a predetermined range.

17. The method of claim 16, wherein the pointing element is a visible laser beam and wherein identifying the desired location with the pointing element causes the desired location to be illuminated by the laser beam.

18. The method of claim 15, wherein the indication of the distance to the desired location is performed using an audible signal.

19. The method of claim 15, wherein the indication of the distance to the desired location is performed using a modulating laser beam.

20. A position identification system comprising:

a receiver configured to receive position signals;

identification logic configured to identify a direction to a desired position; and

a processor coupled to the receiver and to the identification logic, the processor configured to determine a current position based on the position signals and provide to the identification logic a bearing and distance to the desired position.

21. The position identification system of claim 20, wherein the identification logic includes:

a pointing device; and

an alignment device configured to align the pointing device with the desired position based upon the bearing provided by the processor.