×

Location and generation of high accuracy survey control marks using satellites

  • US 5,739,785 A
  • Filed: 01/16/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 03/04/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for accurately determining the location coordinates of an already-existing physical survey mark on or near the Earth'"'"'s surface, using differential position determination in real time, the apparatus comprising:

  • a first Satellite Positioning System (SPS) location determination station with known location coordinates, for receiving SPS signals from at least four SPS signal sources, which are spaced apart from the first SPS station, and for determining location coordinates of the first SPS station from the SPS signals received by the first SPS station;

    a second SPS location determination station for receiving SPS signals from at least four SPS signal sources, and for determining location coordinates of the second SPS station relative to the first SPS station from the SPS signals received by the second SPS station, where the second SPS station is provided with the location coordinates of the first SPS station;

    an angularly orientable measuring device, having first and second ends and a selected length L, with distances marked along the measuring device, for measuring a distance along the measuring device and for measuring an angular orientation in a substantially horizontal plane of a selected direction determined by the first and second ends of the measuring device; and

    where, when the measuring device indicates that the second SPS station is within a distance L from the location of a selected physical survey mark, the measuring device is positioned so that the the measuring device extends from the second SPS station location toward the physical survey mark location, and the second SPS station determines location coordinates of the second SPS station relative to the physical survey mark location along the measuring device.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×