Method and system for variable data rate transmission in RTK GPS survey system

• US 6,985,104 B2
• Filed: 07/29/2002
• Issued: 01/10/2006
• Est. Priority Date: 07/29/2002
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Large, Peter, Allison, Michael Timo, Kirk, Geoffrey R.
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): Behncke, Christine M.
• Application Number:
  US10/209,613
• Publication Number:
  US 20040145516A1
• Time in Patent Office: 1,261 Days
• Field of Search: 701/207, 701/213, 701/214, 701/215, 342/357.03, 342/357.09, 342/357.12, 342/357.14, 342/357.17
• US Class Current: 342/357.27
• CPC Class Codes: G01S 19/04 providing carrier phase data

Abstract

A method and system for variable data rate transmission in a real-time kinematic (RTK) positioning system. An RTK positioning system having a reference station and a rover utilizes wireless communications for data transfer. The data transmission rate between the reference station and the rover is dynamically controlled by a programmable transmission controller. The transmission rate is determined on the basis of specific parameters. Parameters that may be used to determine the data transmission rate include rover demand, required rover accuracy, satellite positioning system (SATPS) events, the required data for ambiguities, and the type and content of the data transmitted.

Claims

1. A method for variable rate data transmission for communication of real-time satellite positioning system (SATPS) data between a rover and a reference station comprising:

acquiring raw SATPS data at said reference station;

converting said raw SATPS data into formatted data;

determining a transmission rate for said formatted data, wherein the data transmission rate is determined on the basis of rover calculation accuracy; and

,

controlling the transmission of said formatted data to said rover using a programmable transmission controller and a wireless transmitter.

2. The method of claim 1, further including receiving data at said reference station from said rover.

3. The method of claim 2, wherein said data comprises transmission rate control instructions.

4. The method of claim 1 further comprising:

determining the transmission rate based upon satellite positioning system events.

5. The method of claim 1, further comprising:

determining the transmission rate based upon the type of data transmitted.

6. The method of claim 1, further comprising:

determining the transmission rate based upon the accuracy required by the rover.

7. The method of claim 1, further comprising:

determining the transmission rate based upon a requirement for data for ambiguities.

8. The method of claim 1, wherein said data transmission is performed using TCP/IP and an IP socket selected from a plurality of IP sockets.

9. A computer readable medium containing executable instructions which, when executed in a real-time satellite positioning system (SATPS) having a reference station and a rover, causes the system to vary a data transmission rate between said reference station and said rover, comprising:

instructions for acquiring raw SATPS data at said reference station;

instructions for converting said raw SATPS data into formatted data;

instructions for determining a transmission rate for said formatted data, wherein the instructions for determining the data transmission rate are generated on the basis of rover calculation accuracy; and

,

instructions for transmitting said formatted data to said rover using said transmission rate.

10. The computer readable medium of claim 9, further including instructions for receiving data at said reference station from said rover.

11. The computer readable medium of claim 10, wherein said data comprises instructions for controlling said transmission rate.

12. The computer readable medium of claim 9, wherein the instructions for determining a transmission rate are further based upon satellite positioning system events.

13. The computer readable medium of claim 9, wherein the instructions for determining a transmission rate are further based upon the type of data transmitted.

14. The computer readable medium of claim 9, wherein the instructions for determining a transmission rate are further based upon the accuracy required by the rover.

15. The computer readable medium of claim 9, wherein the instructions for the determining the data transmission rate are generated on the further basis of a requirement for data for ambiguities.

16. A method for variable rate data transmission for communication of real-time satellite positioning system (SATPS) data between a rover and a reference station comprising:

acquiring SATPS data at said reference station;

determining a transmission rate for said data based on current conditions of a set of criteria, wherein the data transmission rate is determined on the basis of rover calculation accuracy; and

,

controlling the transmission of said data to said rover using a programmable transmission controller and a wireless transmitter.

17. The method of claim 16, further including receiving data at said reference station from said rover.

18. The method of claim 17, wherein said data comprises transmission rate control instructions.

19. The method of claim 16, further comprising:

determining the transmission rate based upon satellite positioning system events.

20. The method of claim 16, further comprising:

determining the transmission rate based upon the type of data transmitted.

21. The method of claim 16, further comprising:

determining the transmission rate based upon the accuracy required by the rover.

22. The method of claim 16, further comprising:

determining the transmission rate based upon a requirement for data for ambiguities.

23. The method of claim 16, wherein said data transmission is performed using TCP/IP and an IP socket selected from a plurality of IP sockets.

24. A method for variable rate data transmission for communication of real-time satellite positioning system (SATPS) data between a rover and a reference station comprising:

acquiring SATPS data at said reference station;

determining a transmission rate for said data according to a predetermined set of criteria, wherein the data transmission rate is determined on the basis of rover calculation accuracy; and

,

dynamically controlling the transmission of said data to said rover using a programmable transmission controller and a wireless transmitter.

25. The method of claim 24, further including receiving data at said reference station from said rover.

26. The method of claim 25, wherein said data comprises transmission rate control instructions.

27. The method of claim 24, further comprising:

determining the transmission rate based upon satellite positioning system events.

28. The method of claim 24, further comprising:

determining the transmission rate based upon the type of data transmitted.

29. The method of claim 24, further comprising:

determining the transmission rate based upon the accuracy required by the rover.

30. The method of claim 24, further comprising:

determining the transmission rate based upon a requirement for data for ambiguities.

31. The method of claim 24, wherein said data transmission is performed using TCP/IP and an IP socket selected from a plurality of IP sockets.