SYSTEMS AND METHODS FOR CONTROLLING A SATELLITE NAVIGATION RECEIVER

• US 20100052984A1
• Filed: 08/24/2009
• Published: 03/04/2010
• Est. Priority Date: 08/26/2008
• Status: Abandoned Application

• Current Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Original Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Inventors: WANG, Hongzhang, YU, Xiaoguang
• Application Number:
  US12/545,994
• Publication Number:
  US 20100052984A1
• Time in Patent Office: Days
• US Class Current: 342/357.290
• CPC Class Codes: G01S 19/34 Power consumption

Abstract

A satellite navigation receiver includes a processing unit, a clock generator, and a power management interface. The processing unit is operable for locating the satellite navigation receiver according to multiple satellite signals. The clock generator coupled to the processing unit is operable for providing a reference clock to the processing unit. The power management interface coupled to the processing unit and the clock generator is operable for switching the satellite navigation receiver in multiple operation states. The operation states include a sleep state in which the processing unit is powered off and the clock generator is powered on.

Claims

1. A satellite navigation receiver comprising:

a processing unit operable for locating said satellite navigation receiver according to a plurality of satellite signals;

a clock generator coupled to said processing unit and operable for providing a reference clock to said processing unit; and

a power management interface coupled to said processing unit and said clock generator and operable for switching said satellite navigation receiver in a plurality of operation states, wherein said operation states comprise a sleep state in which said processing unit is powered off and said clock generator is powered on.

2. The satellite navigation receiver as claimed in claim 1, wherein said processing unit comprises a plurality of channels operable for acquiring and tracking a plurality of satellites that provide said satellite signals, and wherein said operation states comprise an idle state in which all of said channels are disabled when said processing unit is powered on.

3. The satellite navigation receiver as claimed in claim 1, wherein a traveling time of said satellite signals is measured based on said reference clock.

4. The satellite navigation receiver as claimed in claim 1, wherein a time period of said sleep state is measured based on said reference clock.

5. The satellite navigation receiver as claimed in claim 1, further comprising:

a controller coupled to said power management interface and operable for providing a plurality of control signals to said power management interface to control said switching among said operation states.

6. The satellite navigation receiver as claimed in claim 5, wherein said control signals are generated by a machine-executable navigation software application.

7. The satellite navigation receiver as claimed in claim 5, wherein said control signals are generated in response to a hardware action.

8. The satellite navigation receiver as claimed in claim 1, wherein said operation states comprise a working state in which said processing unit and said clock generator are both powered on, and wherein said power management interface enables said satellite navigation receiver to alternately operate in said working state for a first predetermined time period and operate in said sleep state for a second predetermined time period.

9. The satellite navigation receiver as claimed in claim 1, wherein said operation states comprise a working state in which said processing unit and said clock generator are both powered on, and wherein said power management interface enables said satellite navigation receiver to operate in said working state for a predetermined time period and operate in said sleep state until receiving a signal to activate said processing unit.

10. A method for controlling a satellite navigation receiver, said method comprising:

locating said satellite navigation receiver according to a plurality of satellite signals by a processing unit;

providing a reference clock to said processing unit by a clock generator; and

switching said satellite navigation receiver in a plurality of operation states, wherein said operation states comprise a sleep state in which said processing unit is powered off and said clock generator is powered on.

11. The method as claimed in claim 10, wherein said processing unit comprises a plurality of channels operable for acquiring and tracking a plurality of satellites that generate said satellite signals, and wherein said switching step comprises:

switching said satellite navigation receiver to an idle state by disabling all of said channels when said processing unit is powered on.

12. The method as claimed in claim 10, further comprising:

enabling said satellite navigation receiver to alternately operate in a working state in which said processing unit and said clock generator are both powered on for a first predetermined time period and operate in said sleep state for a second predetermined time period.

13. The method as claimed in claim 10, further comprising:

enabling said satellite navigation receiver to operate in a working state in which said processing unit and said clock generator are both powered on for a predetermined time period, and operate in said sleep state until receiving a signal to activate said processing unit.

14. A satellite navigation device, comprising:

a satellite navigation receiver capable of operating in a plurality of operation states, said satellite navigation receiver comprising;

a processing unit operable for generating a plurality of coordinate signals based on a plurality of satellite signals; and

a clock generator coupled to said processing unit and operable for providing a reference clock to said processing unit;

a controller coupled to said satellite navigation receiver and operable for switching said satellite navigation receiver among said operation sates, wherein said operation states comprise a sleep state in which said processing unit is powered off and said clock generator is powered on; and

a display coupled to said satellite navigation receiver and operable for displaying a location of said satellite navigation device based on said coordinate signals.

15. The satellite navigation device as claimed in claim 14, wherein said processing unit comprises a plurality of channels operable for acquiring and tracking a plurality of satellites that generate said satellite signals, and wherein said operation states comprise an idle state in which all of said channels are disabled when said processing unit is powered on.

16. The satellite navigation device as claimed in claim 14, wherein said operation states comprise a working state in which said processing unit and said clock generator are both powered on, and wherein said satellite navigation receiver is enabled to alternately operate in said working state for a first predetermined time period and operate in said sleep state for a second predetermined time period.

17. The satellite navigation device as claimed in claim 14, wherein said operation states comprise a working state in which said processing unit and said clock generator are both powered on, and wherein said satellite navigation receiver is enabled to operate in said working state for a predetermined time period and operate in said sleep state until said controller activates said processing unit.

18. The satellite navigation device as claimed in claim 14, wherein said controller monitors a status of said display, and controls said switching among said operation sates according to said status of said display.

19. The satellite navigation device as claimed in claim 14, wherein said switching among said operation states is controlled by a machine-executable navigation software application installed in said controller.

20. The satellite navigation device as claimed in claim 14, wherein said controller monitors statuses of a plurality of buttons on said satellite navigation device and controls said switching among said operation states according to said statuses of said buttons.