System and/or method for detecting multi-tone jamming

• US 8,503,513 B2
• Filed: 12/02/2011
• Issued: 08/06/2013
• Est. Priority Date: 04/28/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Simic, Emilija M., Chen, Shiou-Hung, Grover, Douglas
• Primary Examiner(s): Torres, Juan A
• Application Number:
  US13/310,535
• Publication Number:
  US 20120076177A1
• Time in Patent Office: 613 Days
• Field of Search: 375/150
• US Class Current: 375/150
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: H04K 3/224 with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
• CPC Class Codes: H04K 3/90 related to allowing or preventing navigation or positioning, e.g. GPS

Abstract

The subject matter disclosed herein relates to a system and method for processing a signal received from a satellite positioning system (SPS) in the presence of a multi-tone jammer. In one particular implementation, processing of a signal may be altered in response to detection of one or more conditions.

Claims

1. A method comprising:

processing a received satellite positioning system (SPS) signal to obtain a correlation peak detection in a code phase search window comprising a range of code phase hypotheses;

detecting two or more energy peaks in the processed SPS signal; and

altering the processing in response to detecting energy peaks spaced apart by more than a set spacing in the range of code phase hypotheses.

2. The method of claim 1, wherein the set spacing is based, at least in part, on a maximum spacing of an energy peak from detection of a later multipath signal and an energy peak resulting from detection of a multipath signal.

3. The method of claim 1, wherein the altering the processing further comprises extending an integration time to allow detection of additional energy peaks in the code phase search window.

4. The method of claim 3, wherein the extending the integration time comprises suspending early termination of integration to obtain an energy result.

5. A mobile station comprising:

a receiver adapted to receive and downconvert a satellite positioning system (SPS) signal; and

a baseband processor, the baseband processor being adapted to;

process the downconverted SPS signal to detect a correlation peak in a code phase search window, the code phase search window comprising a range of code phase hypotheses;

detect two or more energy peaks in the processed SPS signal; and

alter the processing of the downconverted SPS signal in response to detecting the energy peaks spaced apart by more than a set spacing in the range of code phase hypotheses bins.

6. The mobile station of claim 5, wherein the set spacing is based, at least in part, on a maximum spacing of an energy peak from a true code phase detection and a peak resulting from detection of a multipath signal.

7. The mobile station of claim 5, wherein the baseband processor is adapted to alter the processing in response to the detecting by extending an integration time to detect additional energy peaks in the code phase search window.

8. The mobile station of claim 7, wherein the extending the integration time comprises suspending early termination of integration to obtain an energy result.

9. An article comprising:

a non-transitory storage medium having machine readable instructions stored thereon executable by a computing platform to;

control processing of a downconverted satellite positioning system (SPS) signal to detect a correlation peak in a code phase search window comprising a range of code phase hypotheses;

detect two or more energy peaks in the processed SPS signal; and

alter the processing of the downconverted SPS signal in response to detecting energy peaks spaced apart by more than a set spacing in the range of code phase hypotheses.

10. The article of claim 9, wherein the set spacing is based, at least in part, on a maximum spacing of an energy peak from a true code phase detection and a peak resulting from detection of a multipath signal.

11. The article of claim 9, wherein the instructions to alter the processing of the downconverted SPS signal in response to detecting energy peaks spaced apart by more than a set spacing in the range of code phase hypotheses further comprise instructions to extend an integration time to detect additional energy peaks in the code phase search window.

12. The article of claim 11, wherein the instructions to extend the integration time comprise instructions to suspend early termination of integration to obtain an energy result.

13. An apparatus comprising:

means for processing a received satellite positioning system (SPS) signal to detect a correlation peak in a code phase search window comprising a range of code phase bins associated with code phase hypotheses;

means for detecting two or more energy peaks in the processed SPS signal; and

means for altering the processing in response to detecting energy peaks spaced apart by more than a set spacing in the range of code phase bins.

14. The apparatus of claim 13, wherein the set spacing is based, at least in part, on a maximum spacing of an energy peak resulting from detection of a later multipath and a peak resulting from detection of a multipath signal.

15. The apparatus of claim 13, wherein the means for altering the processing further comprises means for extending an integration time to allow detection of additional energy peaks in the code phase search window.

16. The apparatus of claim 15, wherein the means for extending the integration time comprises suspending early termination of integration to obtain an energy result.