Handheld surveying device and method

• US 5,903,235 A
• Filed: 04/15/1997
• Issued: 05/11/1999
• Est. Priority Date: 04/15/1997
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Nichols, Mark Edward
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Phan, Dao L.
• Application Number:
  US08/842,699
• Time in Patent Office: 756 Days
• Field of Search: 342/352, 342/357, 342/419, 701/213
• US Class Current: 342/357.31
• CPC Class Codes: G01C 15/00 Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
• CPC Class Codes: G01S 19/11 wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]

Abstract

A handheld survey device includes a Global Positioning System (GPS) receiver for receiving position information, a pointer to point to the location to be measured, a measuring device to measure the distance between the handheld device and the location to be measured and a level and heading device to determine the level and heading of the handheld device. A processor located within the handheld device computes the position of the location using the position information, the distance measured between the handheld device and the location, and the level and heading information. The position computed meets the stringent accuracy requirements dictated by survey applications without the use of a range pole.

Claims

1. A handheld survey device operated by a user comprising:

a first antenna/receiver receiving position signals that identify the position of the handheld device;

a pointing element for pointing to the location to be measured;

a measuring element for measuring the distance between the location to be measured and the handheld device;

a level and heading element that determines a tilt and orientation of the handheld device;

a processor coupled to receive the position signals, the distance between the location to be measured and the handheld device, and the level and headings of the handheld device, said processor computing in real time the position of the location to be measured.

2. The handheld survey device of claim 1, wherein the antenna/receiver receives Global Positioning System (GPS) signals.

3. The handheld survey device of claim 1, wherein the pointing element is a laser pointer.

4. The handheld survey device of claim 1, wherein the pointing element is an optical plummet.

5. The handheld survey device of claim 1, wherein the measuring element is a sonic-based measuring device.

6. The handheld survey device of claim 1, wherein the measuring element is a laser-based measuring device.

7. The handheld survey device of claim 1, further comprising a second antenna/receiver for receiving correction signals to adjust the position signals.

8. The handheld survey device of claim 1 further comprising a fanny pack for housing the second antenna receiver, said second antenna/receiver coupled to the processor via a data link.

9. The handheld survey device as set forth in claim 1 further comprising data storage.

10. The handheld survey device as set forth in claim 9, further comprising a fanny pack for placement of the data storage, said data storage coupled to the processor via a data link.

11. The handheld survey device of claim 1, wherein the first antenna/receiver further receives correction signals to adjust the position signals.

12. A method for surveying a location using a handheld device comprising the steps of:

positioning the handheld device to point to the location;

determining the level and heading of the handheld device;

measuring the distance between the location and the handheld device;

receiving position signals indicative of the position of the handheld device; and

computing in real time the position of the location using the position signals, the measured distance between the location and handheld device, and the level and heading of the handheld device.

13. The methods for surveying as set forth in claim 12, wherein the step of receiving position signals comprises receiving Global Positioning System (GPS) signals.

14. The method for surveying as set forth in claim 13, further comprising the step of receiving differential GPS correction signals to adjust the GPS signals.

15. The method for surveying as set forth in claim 12, further comprising the step of receiving correction signals to adjust the position signals.

16. The method as set forth in claim 12, wherein the step of measuring comprises sonically measuring the distance between the location and the handheld device.