Systems and methods for controlling a satellite navigation receiver

• US 8,234,061 B2
• Filed: 09/29/2009
• Issued: 07/31/2012
• Est. Priority Date: 10/21/2008
• Status: Active Grant

• Current Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Original Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Inventors: Yu, Xiaoguang, WANG, Hongzhang
• Primary Examiner(s): Liu, Harry
• Application Number:
  US12/568,950
• Publication Number:
  US 20100100320A1
• Time in Patent Office: 1,036 Days
• Field of Search: 701/213
• US Class Current: 701/213
• CPC Class Codes: G01S 19/34 Power consumption

Abstract

A satellite navigation receiver having multiple operation states includes a processing unit and a power management interface. The processing unit is operable for locating the satellite navigation receiver based on multiple satellite signals and operable for setting multiple time durations of the operation states respectively based on a velocity of the satellite navigation receiver. The power management interface coupled to the processing unit is operable for switching the satellite navigation receiver among the operation states according to the time durations.

Claims

1. A satellite navigation receiver operating in a plurality of operation states, the satellite navigation receiver comprising:

a processing unit configured to;

locate the satellite navigation receiver based on a plurality of satellite signals,

sample a velocity of the satellite navigation receiver for a predetermined number of times during a predetermined time period to provide a plurality of sampled velocity values,

calculate an average velocity of the satellite navigation receiver based on the sampled velocity values, and

set a plurality of time durations of the plurality of operation states, respectively, based on the average velocity of the satellite navigation receiver; and

a power management interface operatively coupled to the processing unit and configured to switch the satellite navigation receiver among the plurality of operation states according to the plurality of time durations.

2. The satellite navigation receiver as claimed in claim 1, wherein the plurality of operation states comprise:

a working state in which the processing unit is powered on, and

a sleep state in which said the processing unit is powered off.

3. The satellite navigation receiver as claimed in claim 1, wherein the processing unit comprises a velocity component configured to calculate the said velocity of the satellite navigation receiver based on locating the satellite navigation receiver.

4. The satellite navigation receiver as claimed in claim 1, wherein the processing unit comprises a velocity component configured to calculate the velocity of the satellite navigation receiver according to a Doppler frequency shift of the plurality of satellite signals.

5. The satellite navigation receiver as claimed in claim 1, wherein the processing unit comprises a velocity component configured to calculate the velocity of the satellite navigation receiver and perform digital signal processing on the calculated velocity.

6. The satellite navigation receiver as claimed in claim 1, wherein the processing unit is configured to store a plurality of time data sets associated with a plurality of corresponding velocity conditions, and wherein the processing unit is configured to select a corresponding time data set according to a condition of the velocity and set the time durations according to the corresponding time data set.

7. The satellite navigation receiver as claimed in claim 6, wherein the processing unit is further configured to define a velocity threshold, and compare the average velocity to the velocity threshold to determine the condition of the velocity.

8. The satellite navigation receiver as claimed in claim 6, wherein the time data sets are predetermined and stored in the satellite navigation receiver.

9. A method for controlling a satellite navigation receiver, the method comprising:

locating the satellite navigation receiver according to a plurality of satellite signals;

sampling a velocity of the satellite navigation receiver for a predetermined number of times during a predetermined time period to provide a plurality of sampled velocity values;

calculating an average velocity of the satellite navigation receiver based on the sampled velocity values;

switching the satellite navigation receiver between a plurality of operation states according to a plurality of predetermined time durations of the plurality of operation states, respectively; and

setting the plurality of predetermined time durations based on the average velocity of the satellite navigation receiver.

10. The method as claimed in claim 9, wherein the switching step comprises:

alternately switching the satellite navigation receiver between a working state in which a processing unit is powered on and a sleep state in which the processing unit is powered off.

11. The method as claimed in claim 9, further comprising:

calculating the velocity of the satellite navigation receiver based on locating the satellite navigation receiver.

12. The method as claimed in claim 9, further comprising:

calculating the velocity of the satellite navigation receiver according to a Doppler frequency shift of the plurality of satellite signals.

13. The method as claimed in claim 9, further comprising:

calculating the velocity of the satellite navigation receiver; and

performing digital signal processing on the calculated velocity.

14. The method as claimed in claim 9, wherein the setting step comprises:

accessing a plurality of time data sets associated with a corresponding plurality of velocity conditions;

selecting a corresponding time data set from the plurality of time data sets according to a corresponding velocity condition; and

setting the predetermined time durations according to the selected time data set.

15. The method as claimed in claim 14, further comprising:

defining a velocity threshold; and

determining the condition of said velocity by comparing the average velocity to the velocity threshold.

16. A satellite navigation device comprising:

a satellite navigation receiver configured to operate in a plurality of operation states, the satellite navigation receiver comprising;

a tracking module configured to provide acquiring and tracking data of a plurality of satellites according to a plurality of satellite signals;

a non-transitory machine-readable medium operatively coupled to said tracking module, that stores a plurality of instruction codes executable by a processor to;

provide a coordinate signal based on the acquiring and tracking data,

sample a velocity of the satellite navigation receiver a redetermined number of times during a predetermined time period to provide a plurality of sampled velocity values,

calculate an average velocity of the satellite navigation receiver based on the sampled velocity values, and

set a plurality of time durations of the plurality of operation states, respectively, based on the average velocity of the satellite navigation device; and

a display, operatively coupled to the satellite navigation receiver, and configured to display a location of the satellite navigation device according to the coordinate signal.

17. The satellite navigation device as claimed in claim 16, wherein the non-transitory machine-readable medium stores the plurality of instruction codes executable by the processor to calculate the velocity of the satellite navigation receiver according to the coordinate signal.

18. The satellite navigation device as claimed in claim 16, wherein said the non-transitory machine-readable medium stores the plurality of instruction codes executable by the processor to calculate the velocity of the satellite navigation receiver according to a Doppler frequency shift of the plurality of satellite signals.

19. The satellite navigation device as claimed in claim 16, wherein said non-transitory machine-readable medium further stores a plurality of predetermined time data sets associated with a plurality of velocity conditions, respectively, and wherein the plurality of instruction codes is executable by the processor to select a corresponding time data set according to a condition of the velocity and set the time durations according to the selected time data set.

20. The satellite navigation device as claimed in claim 19, wherein the non-transitory machine-readable medium further stores a velocity threshold, and wherein the plurality of instruction codes is further executable by the processor to determine the condition of the velocity by comparing the average velocity to the velocity threshold.

21. The satellite navigation device as claimed in claim 19, wherein the time data sets are predetermined and stored in the satellite navigation device.