Controlling power dissipation in a base station of a navigation satellite system (NSS)

• US 8,554,135 B2
• Filed: 03/15/2011
• Issued: 10/08/2013
• Est. Priority Date: 03/15/2011
• Status: Active Grant

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Branch, Charles
• Primary Examiner(s): Nguyen, Hai V
• Application Number:
  US13/048,132
• Publication Number:
  US 20120236907A1
• Time in Patent Office: 938 Days
• Field of Search: 455/13.4
• US Class Current: 455/13.4
• CPC Class Codes: G01S 19/03 Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
• CPC Class Codes: G01S 19/04 providing carrier phase data
• CPC Class Codes: G01S 19/072 Ionosphere corrections

Abstract

A method and system for controlling power dissipation in a base station of a navigation satellite system (NSS) is disclosed. One method utilizes a sensor to monitor one or more components of the base station. Then, based on information from the sensor, a transmission bit rate is increased from a pre-defined bit rate to an increased transmission bit rate for an NSS message transmitted from the base station without reducing transmission power level of the base station. The method also periodically provides a bit rate update signal at the pre-defined bit rate, the bit rate update signal informing a rover utilizing the base station of the increased transmission bit rate for the NSS message transmitted from the base station.

Claims

1. A method for controlling power dissipation in a base station of a navigation satellite system (NSS), said method comprising:

utilizing a sensor to monitor one or more components of said base station;

increasing a transmission bit rate, based on information from said sensor, from a pre-defined bit rate to an increased transmission bit rate for an NSS message transmitted from said base station;

reducing a duty cycle for one or more transmission components of said base station without reducing a transmission power level of said base station; and

periodically providing a bit rate update signal at said pre-defined bit rate, said bit rate update signal informing a rover utilizing said base station of said increased transmission bit rate for the NSS message transmitted from said base station.

2. The method of claim 1 further comprising:

performing said increasing of said transmission bit rate and said reducing of said duty cycle when one or more components of said base station reach a sensor threshold.

3. The method of claim 2 further comprising:

utilizing a temperature sensor to provide said sensor threshold for a temperature of one or more components of said base NSS system.

4. The method of claim 2 further comprising:

utilizing a battery sensor to provide said sensor threshold for a battery life of one or more batteries utilized by said base NSS system.

5. The method of claim 1 further comprising:

performing said increasing of said transmission bit rate adjust increment as a discretely variable adjustment.

6. The method of claim 1 further comprising:

performing said increasing of said transmission bit rate adjust increment as a continuously variable adjustment.

7. The method of claim 1 further comprising:

performing said increasing of said transmission bit rate and said reducing of said duty cycle when one or more components of said base station approaches a sensor threshold.

8. The method of claim 1 further comprising:

decreasing said transmission bit rate and increasing said duty cycle, based on information from said sensor, without reducing a transmission power level of said base station.

9. The method of claim 8 further comprising:

decreasing said transmission bit rate from the group consisting of;

a discretely variable adjustment and a continuously variable adjustment.

10. The method of claim 1 further comprising:

sending out a rover request; and

awaiting a rover response before increasing said transmission bit rate.

11. The method of claim 1 further comprising:

utilizing a data compression method to reduce a data packet size to fit said NSS message into said increased transmission bit rate.

12. The method of claim 1 further comprising:

deleting portions of data to reduce data packet size to fit said NSS message into said increased transmission bit rate.

13. The method of claim 1 further comprising:

performing additional increases in said transmission bit rate for the NSS message transmitted from said base station without reducing the transmission power level at said base station; and

periodically providing a bit rate update signal to the rover at the pre-defined bit rate and at each increased transmission bit rate.

14. The method of claim 1 further comprising:

providing said bit rate update signal on a same communications path that the base station is utilizing for transmitting data to the rover.

15. The method of claim 14 further comprising:

providing said bit rate update signal in a header of a data transmission.

16. The method of claim 15 further comprising:

including error information in the header causing the rover to translate the message as an automatic “

update”

thereby automatically update its receiver message bit rate.

17. The method of claim 15 further comprising:

including error information in the header causing the rover to generate a text message informing a user of a bit rate change.

18. The method of claim 1 further comprising:

providing said bit rate update signal on a secondary communications path different from a communications path that the base station is utilizing for transmitting data to the rover.

19. The method of claim 18 wherein said secondary communications path is selected from the group consisting of:

a second radio channel, a short message service (SMS), an enhanced messaging service (EMS), a multimedia message service (MMS), Internet, a local area network (LAN), and a wide area network (WAN).

20. A power dissipation controller for a base station of a navigation satellite system (NSS) comprising:

a base station component sensor;

a bit rate transmission adjuster for adjusting a bit rate transmission for an NSS message transmitted from said base station based on an output from said sensor, said bit rate transmission adjusted from an initial bit rate to an increased bit rate;

a duty cycle reducer for reducing a duty cycle of one or more transmission components of said base station without adjustment to a transmission power level of said base station; and

a periodic rover update transmitter for providing a periodic signal at the initial bit rate after the bit rate transmission has been adjusted, said periodic signal providing the increased bit rate at which the NSS message is being transmitted.

21. The power dissipation controller of claim 20 wherein the sensor is a temperature sensor.

22. The power dissipation controller of claim 20 wherein the sensor is a battery strength sensor.

23. The power dissipation controller of claim 20 further comprising:

a receiver for receiving a response from at least one rover prior to adjusting the bit rate transmission for the NSS message transmitted from said base station.

24. The power dissipation controller of claim 20 wherein the bit rate transmission adjustor utilizes a data compression method to reduce data size to fit into higher bit rate for the NSS message transmitted from said base station.

25. The power dissipation controller of claim 20 wherein the bit rate transmission adjustor deletes portions of data to reduce data packet size to fit into higher bit rate for the NSS message transmitted from said base station.

26. A non-transitory computer readable medium having instructions thereon, said instructions causing a processor to perform a method for utilizing a sensor monitoring one or more components of a base station of a navigation satellite system (NSS) to maintain a transmission power level for said base station, said method comprising:

increasing a transmission bit rate from a pre-defined bit rate to an increased transmission bit rate for an NSS message transmitted from said base station;

reducing a duty cycle for one or more transmission components of said base station without reducing a transmission power level of said base station, said increasing of said transmission bit rate and said reducing of said duty cycle performed when one or more of components of said base station reach a sensor threshold; and

periodically providing a bit rate update signal at said pre-defined bit rate, said bit rate update signal informing a rover utilizing said base station of said increased transmission bit rate for the NSS message transmitted from said base station.

27. The non-transitory computer readable medium of claim 26 further comprising:

utilizing a temperature sensor for monitoring a temperature of one or more components of said base NSS system.

28. The non-transitory computer readable medium of claim 26 further comprising:

utilizing a battery sensor for monitoring a battery life of one or more batteries utilized by said base NSS system.

29. The non-transitory computer readable medium of claim 26 further comprising:

increasing said transmission bit rate and reducing said duty cycle when one or more of components of said base station approaches a sensor threshold.

30. The non-transitory computer readable medium of claim 26 further comprising:

performing additional said increasing of said transmission bit rate and said reducing of said duty cycle for the NSS message transmitted from said base station when one or more of said components of said base station reach a sensor threshold, without reducing the transmission power level at said base station; and

periodically providing a bit rate update signal to the rover at the pre-defined bit rate and at each increased transmission bit rate.

31. The non-transitory computer readable medium of claim 26 further comprising:

adding forward error correction to the NSS message.