METHOD AND COMMUNICATION SYSTEM FOR LIMITING THE FUNCTIONALITY OF AN ELECTRONIC DEVICE

• US 20090309787A1
• Filed: 06/17/2008
• Published: 12/17/2009
• Est. Priority Date: 06/17/2008
• Status: Active Grant

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Gildea, David
• Granted Patent: US 8,013,786 B2
• Time in Patent Office: Days
• US Class Current: 342/357.310
• CPC Class Codes: G01C 21/3641 Personalized guidance, e.g. limited guidance on previously travelled routes
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/14 specially adapted for specific applications

Abstract

Embodiments of the present invention recite a method and system for limiting the functionality of a mobile electronic device. In one embodiment, a Global Navigation Satellite System (GNSS) receiver configured to determine a GNSS Doppler frequency shift measurement corresponding to a GNSS signal. A control component is configured to control an operation of the mobile electronic device in response to a control signal which is generated when the GNSS Doppler frequency shift measurement is used to determine that the speed of the mobile electronic device exceeds a speed threshold.

Claims

1. A mobile electronic device comprising:

a Global Navigation Satellite System (GNSS) receiver configured to determine a GNSS Doppler frequency shift measurement corresponding to a GNSS signal; and

a control component configured to control an operation of said mobile electronic device in response to a control signal which is generated when said GNSS Doppler frequency shift measurement is used to determine that a speed of said mobile electronic device exceeds a speed threshold.

2. The mobile electronic device of claim 1 further comprising:

a communication transceiver configured to automatically transmit to a station an offline GNSS data signal comprising said GNSS Doppler frequency shift measurement and a time tag, and to automatically receive from said station an offline signal which conveys said control signal when said station uses said GNSS Doppler frequency shift measurement to determine that said speed of said mobile electronic device exceeds said speed threshold.

3. The mobile electronic device of claim 2 wherein said communication transceiver is configured to receive one or more offline wireless signals comprising a predicted Doppler frequency shift, a predicted GNSS code phase offset, a GNSS data bit time prediction, and a GNSS clock time estimate for use by the GNSS receiver for acquiring said GNSS signal.

4. The mobile electronic device of claim 3 wherein said GNSS receiver is configured to use said predicted Doppler frequency shift, said predicted GNSS code phase offset, said GNSS data bit time prediction, and said GNSS clock time estimate for tuning to a carrier frequency, decreasing a time for making said measurement of said Doppler frequency shift, narrowing a range of GNSS code phase offsets for making a GNSS code phase offset determination and generating a GNSS clock time tag for said GNSS signal.

5. The mobile electronic device of claim 1 wherein said control signal is received from a system comprising:

a speed determiner configured to use said GNSS Doppler frequency shift measurement to determine said speed of said mobile electronic device.

6. The mobile electronic device of claim 5 wherein said speed determiner is further configured to use a geographical position corresponding to said mobile electronic device and an orbital parameter for a GNSS satellite to determine an expected value proportional to an expected range rate between said mobile electronic device and said GNSS satellite and configured to use said expected value with said GNSS Doppler frequency shift measurement to determine said speed.

7. The mobile electronic device of claim 5 wherein said system is configured to receive at least one GNSS code phase offset determination for said GNSS signal received at said mobile electronic device and wherein said speed determiner is configured to determine said geographic position of said mobile electronic device based at least in part on said GNSS code phase offset determination.

8. The mobile electronic device of claim 5 further comprising:

a communication transceiver configured to receive an offline wireless signal having said speed; and

;

a speed comparator configured to determine when said speed exceeds said speed threshold.

9. The mobile electronic device of claim 5 wherein said speed determiner further comprises:

a relative measurement calculator configured to calculate a plurality of measured range rates corresponding to a plurality of said GNSS Doppler frequency shift measurements and calculating a plurality of expected range rates between said mobile electronic device and a plurality of GNSS satellites; and

a comparator configured to compare said measured range rates with said expected range rates to determine said speed.

10. The mobile electronic device of claim 1 wherein said control component is configured to initiate an action in response to said control signal and wherein said action is selected from the group consisting of:

generating an audible notification by said mobile electronic device when a user input device in said mobile electronic device is operated, restricting an operation of a user input device of said mobile electronic device, requiring the use of a hands-free operation device to operate said mobile electronic device, and requiring the use of a voice activation system to operate said mobile electronic device.

11. The mobile electronic device of claim 1 further comprising:

a communication transceiver configured to receive one or more offline wireless signals comprising a predicted Doppler frequency shift, a predicted GNSS code phase offset, a GNSS data bit time prediction, and a GNSS clock time estimate and wherein said GNSS receiver is configured to use said predicted Doppler frequency shift, said predicted GNSS code phase offset, said GNSS data bit time prediction, and said GNSS clock time estimate for tuning to a carrier frequency, decreasing a time for making said measurement of said Doppler frequency shift, narrowing a range of GNSS code phase offsets for making a GNSS code phase offset determination and generating a GNSS clock time tag for said GNSS signal, said communication transceiver further configured to transmit to a station an offline GNSS data signal comprising said GNSS Doppler frequency shift measurement, said GNSS code phase offset determination, and a time tag and to receive from said station an offline signal which conveys said control signal when said station uses said GNSS Doppler frequency shift measurement to determine that said speed of said mobile electronic device exceeds said speed threshold; and

and wherein said station determines said geographic position of said mobile electronic device based at least in part on said GNSS code phase offset determination and utilizes a speed determiner configured to use an orbital parameter for a GNSS satellite to determine a relative expected value proportional to a relative expected range rate between said mobile electronic device and said GNSS satellite and is further configured to use said relative expected value with said GNSS Doppler frequency shift measurement to determine said speed and to generate said control signal in response to determining that said speed of said mobile electronic device exceeds said speed threshold.

12. The mobile electronic device of claim 11 wherein said speed determiner further comprises:

a relative measurement calculator configured to calculate a plurality of measured range rates corresponding to a plurality of said GNSS Doppler frequency shift measurements and calculating a plurality of expected range rates between said mobile electronic device and a plurality of GNSS satellites; and

a comparator configured to compare said measured range rates with said expected range rates to determine said speed.

13. The mobile electronic device of claim 1 wherein said control signal conveys said speed from a base station to said mobile electronic device and wherein said control component is configured to control an operation of said mobile electronic device in response to said control signal.

14. The mobile electronic device of claim 1 further comprising:

a speed determiner configured to use said GNSS Doppler frequency shift measurement to determine that a speed of said mobile electronic device exceeds said speed threshold and to generate said control signal in response to said determining.

15. The mobile electronic device of claim 14 further comprising:

a communication transceiver configured to receive one or more offline wireless signals comprising a predicted Doppler frequency shift, a predicted GNSS code phase offset, a GNSS data bit time prediction, and a GNSS clock time estimate.

16. The mobile electronic device of claim 14 wherein said GNSS receiver is configured to use said predicted Doppler frequency shift, said predicted GNSS code phase offset, said GNSS data bit time prediction, and said GNSS clock time estimate for tuning to a carrier frequency, decreasing a time for making said measurement of said Doppler frequency shift, narrowing a range of GNSS code phase offsets for making a GNSS code phase offset determination and generating a GNSS clock time tag for said GNSS signal.

17. The mobile electronic device of claim 14 wherein said speed determiner is further configured to use a geographical position corresponding to said mobile electronic device and an orbital parameter for a GNSS satellite to determine an expected value proportional to a expected range rate for said GNSS satellite and configured to use said expected value with said GNSS Doppler frequency shift measurement to determine said speed.

18. The mobile electronic device of claim 17 wherein said speed determiner further comprises:

a relative measurement calculator configured to calculate a plurality of measured range rates corresponding to a plurality of said GNSS Doppler frequency shift measurements and calculating a plurality of expected range rates between said mobile electronic device and a plurality of GNSS satellites; and

a comparator configured to compare said measured range rates with said expected range rates to determine said speed.

19. The mobile electronic device of claim 1 wherein said control component is configured to initiate an action in response to said control signal and wherein said action is selected from the group consisting of:

generating an audible notification by said mobile electronic device when a user input device in said mobile electronic device is operated, restricting an operation of a user input device of said mobile electronic device, requiring the use of a hands-free operation device to operate said mobile electronic device, and requiring the use of a voice activation system to operate said mobile electronic device.

20. A method for limiting the functionality of a mobile electronic device, said method comprising:

using a Global Navigation Satellite System (GNSS) receiver to determine a GNSS Doppler frequency shift measurement corresponding to a GNSS signal; and

controlling an operation of said mobile electronic device in response to a control signal which is generated when said GNSS Doppler frequency shift measurement is used to determine that a speed of said mobile electronic device exceeds a speed threshold.

21. The method as recited in claim 20 further comprising:

transmitting to a station an offline GNSS data signal comprising said GNSS Doppler frequency shift measurement and a time tag; and

automatically receiving an offline signal from said station which conveys said control signal when said station uses said GNSS Doppler frequency shift measurement to determine that said speed of said mobile electronic device exceeds said speed threshold.

22. The method as recited in claim 21 further comprising:

receiving one or more offline wireless signals comprising a predicted Doppler frequency shift, a predicted GNSS code phase offset, a GNSS data bit time prediction, and a GNSS clock time estimate for use by the GNSS receiver for acquiring said GNSS signal.

23. The method as recited in claim 22 further comprising:

using said predicted Doppler frequency shift, said predicted GNSS code phase offset, said GNSS data bit time prediction, and said GNSS clock time estimate for;

tuning to a carrier frequency;

decreasing a time for making said measurement of said Doppler frequency shift;

narrowing a range of GNSS code phase offsets for making a GNSS code phase offset determination; and

generating a GNSS clock time tag for said GNSS signal.

24. The method as recited in claim 20 further comprising:

receiving said control signal from a system comprising a speed determiner configured to use said GNSS Doppler frequency shift measurement to determine said speed of said mobile electronic device.

25. The method as recited in claim 24 further comprising:

using by said speed determiner, a geographical position corresponding to said mobile electronic device and an orbital parameter for a GNSS satellite to determine an expected value proportional to an expected range rate between said mobile electronic device and said GNSS satellite; and

using said expected value with said GNSS Doppler frequency shift measurement to determine said speed.

26. The method as recited in claim 24 further comprising:

receiving at least one GNSS code phase offset determination for said GNSS signal received at said mobile electronic device; and

determining by said speed determiner said geographic position of said mobile electronic device based at least in part on said GNSS code phase offset determination.

27. The method as recited in claim 24 further comprising

receiving an offline wireless signal having said speed;

and wherein;

using a speed comparator to determine when said speed exceeds said speed threshold.

28. The method as recited in claim 24 wherein using said speed determiner further comprises:

using a relative measurement calculator to calculate a plurality of measured range rates corresponding to a plurality of said GNSS Doppler frequency shift measurements and to calculate a plurality of expected range rates between said mobile electronic device and a plurality of GNSS satellites; and

comparing said relative measured range rates with said expected range rates to determine said speed.

29. The method as recited in claim 20 further comprising:

initiating an action in response to said control signal and wherein said action is selected from the group consisting of;

generating an audible notification by said mobile electronic device when a user input device in said mobile electronic device is operated, restricting an operation of a user input device of said mobile electronic device, requiring the use of a hands-free operation device to operate said mobile electronic device, and requiring the use of a voice activation system to operate said mobile electronic device.

30. The method as recited in claim 20 further comprising:

receiving one or more offline wireless signals comprising a predicted Doppler frequency shift, a predicted GNSS code phase offset, a GNSS data bit time prediction, and a GNSS clock time estimate;

using said predicted Doppler frequency shift, said predicted GNSS code phase offset, said GNSS data bit time prediction, and said GNSS clock time estimate for;

tuning to a carrier frequency;

decreasing a time for making said measurement of said Doppler frequency shift;

narrowing a range of GNSS code phase offsets for making a GNSS code phase offset determination; and

generating a GNSS clock time tag for said GNSS signal;

transmitting to a station an offline GNSS data signal comprising said GNSS Doppler frequency shift measurement, said GNSS code phase offset determination, and a time tag;

determining by said station said geographic position of said mobile electronic device based at least in part on said GNSS code phase offset determination;

using a speed determiner configured to use an orbital parameter for a GNSS satellite to determine an expected value proportional to an expected range rate between said mobile electronic device and said GNSS satellite;

using said expected value with said GNSS Doppler frequency shift measurement to determine said speed and to generate said control signal in response to determining that said speed of said mobile electronic device exceeds said speed threshold; and

receiving from said station an offline signal which conveys said control signal when said station uses said GNSS Doppler frequency shift measurement to determine that said speed of said mobile electronic device exceeds said speed threshold.

31. The method as recited in claim 30 wherein using said speed determiner further comprises:

using a relative measurement calculator to calculate a plurality of measured range rates corresponding to a plurality of said GNSS Doppler frequency shift measurements and calculating a plurality of expected range rates between said mobile electronic device and a plurality of GNSS satellites; and

comparing said relative measured range rates with said expected range rates to determine said speed.

32. The method as recited in claim 20 further comprising:

using said control signal to convey said speed from a base station to said mobile electronic device; and

using said control component to control an operation of said mobile electronic device in response to said control signal.

33. The method as recited in claim 20 further comprising:

utilizing a speed determiner to use said GNSS Doppler frequency shift measurement to determine that a speed of said mobile electronic device exceeds said speed threshold; and

generating said control signal in response to said determining.

34. The method as recited in claim 33 further comprising:

receiving one or more offline wireless signals comprising a predicted Doppler frequency shift, a predicted GNSS code phase offset, a GNSS data bit time prediction, and a GNSS clock time estimate.

35. The method as recited in claim 33 further comprising:

using said predicted Doppler frequency shift, said predicted GNSS code phase offset, said GNSS data bit time prediction, and said GNSS clock time estimate for;

tuning to a carrier frequency;

decreasing a time for making said measurement of said Doppler frequency shift;

narrowing a range of GNSS code phase offsets for making a GNSS code phase offset determination; and

generating a GNSS clock time tag for said GNSS signal.

36. The method as recited in claim 33 further comprising:

using a geographical position corresponding to said mobile electronic device and an orbital parameter for a GNSS satellite to determine an expected value proportional to an expected range rate for said GNSS satellite; and

using said expected value with said GNSS Doppler frequency shift measurement to determine said speed.

37. The method as recited in claim 36 further comprising:

using a relative measurement calculator to calculate a plurality of measured range rates corresponding to a plurality of said GNSS Doppler frequency shift measurements and to calculating a plurality of expected range rates between said mobile electronic device and a plurality of GNSS satellites; and

comparing said measured range rates with said expected range rates to determine said speed.

38. The method as recited in claim 20 further comprising:

initiating an action in response to said control signal and wherein said action is selected from the group consisting of;

generating an audible notification by said mobile electronic device when a user input device in said mobile electronic device is operated, restricting an operation of a user input device of said mobile electronic device, requiring the use of a hands-free operation device to operate said mobile electronic device, and requiring the use of a voice activation system to operate said mobile electronic device.