Method of determining the integral wave phase in a geodetic interferometry method

• US 5,821,899 A
• Filed: 07/26/1996
• Issued: 10/13/1998
• Est. Priority Date: 09/14/1995
• Status: Expired due to Fees

• Current Assignee: Sokkia Co. Ltd. (Topcon Corporation)
• Original Assignee: Sokkia Co. Ltd. (Topcon Corporation)
• Inventors: Ishii, Hiroshi
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): PHAN, DAO LINDA
• Application Number:
  US08/686,548
• Time in Patent Office: 809 Days
• Field of Search: 342/357, 342/419, 342/442, 342/156, 342/424
• US Class Current: 342/357.27
• CPC Class Codes: G01S 19/44 Carrier phase ambiguity resolution; Floating ambiguity; LAMBDA [Least-squares AMBiguity Decorrelation Adjustment] method

Abstract

In a geodetic interferometry method, a pair of GPS antennae are set at a fixed known point and an unknown point and radio signals transmitted from a plurality of satellites are received at the same time with the GPS antennae to determine the distance and bearing between the known point and the unknown point. In this process, the GPS antenna at the unknown point is sequentially set at two positions which are equidistant and 180° opposite each other with respect to the GPS antenna set at the known point and the integral wave phase is determined from the radio signals received from the satellites at these two positions.

Claims

1. An improved geodetic interferometry method including the steps of setting a pair of GPS antennae at a fixed known point and an unknown point, respectively, and receiving L1 band radio signals transmitted from at least one satellite with the GPS antennae at the same time to determine the distance and bearing between the known point and the unknown point, wherein the improvement comprises

determining the integral wave phase by the steps of:

sequentially positioning the GPS antenna of the unknown point at two locations which are equidistant a distance r and 180°

opposite each other with respect to the other GPS antenna that is positioned at the known point, and

determining the integral wave phase based on the L1 band radio signals received at the two 180°

opposite positions from the satellite in a manner that is independent of the length of distance r.

2. The improved method of claim 1, wherein said step of determining the integral wave phase is implemented solely by determining an angle of elevation ⊖

of said satellite with respect to said GPS antennae located at said fixed point and determining phase differences in said L1 band radio signals received by said pair of GPS antennae at nearly simultaneous times t and t¹.

3. The improved method of claim 1, wherein said L1 band radio signals are transmitted and received continuously during said sequential positioning.

4. The improved method of claim 1, wherein said integral wave phase is determined by doubling the difference in a carrier wave phase of said L1 band signals at both of said two locations, summing said double differences together, and then dividing the resulting sum by two.

5. The improved method of claim 1, wherein both the GPS antennae are circular, and including the step of determining the diameter of said antennae prior to said sequential positioning step.