Benchmarking and testing GPS performance on communication devices

• US 7,797,132 B1
• Filed: 08/24/2007
• Issued: 09/14/2010
• Est. Priority Date: 08/24/2007
• Status: Active Grant

• Current Assignee: Nextel Communications (Deutsche Telekom AG)
• Original Assignee: Nextel Communications (Deutsche Telekom AG)
• Inventors: Mehmood, Arsalan Sajid, Lele, Kamlesh, Oberlender, Robert Scott
• Primary Examiner(s): Wachsman; Hal D
• Assistant Examiner(s): Suarez; Felix E
• Application Number:
  US11/844,485
• Time in Patent Office: 1,117 Days
• Field of Search: 702/69, 702/89, 702/176, 702/178, 702/181, 702/182, 702/188, 340/436, 455/456.6, 701/207
• US Class Current: 702/182
• CPC Class Codes: G01C 25/00 Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass testing, calibrating or compensating compasses G01C17/38
• 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 19/23 Testing, monitoring, correcting or calibrating of receiver elements
• CPC Class Codes: H04M 1/24 Arrangements for testing
• CPC Class Codes: H04M 2250/10 including a GPS signal receiver

Abstract

A method and system for providing repeatable GPS performance testing of a communication device are provided. Navigation data is complied over a drive route. The navigation data is used as an input to a GPS simulator to duplicate in a laboratory setting the GPS signals present at the GPS receiver during a travel along the drive route. Performance data of a baseline unit can be obtained for benchmarking the performance of a communication device being tested. A device under test can also be exposed to simulated GPS signals and to both simulated GPS signals and other radio frequency signals, such as telephone network signals present along the drive route.

Claims

1. A method for testing GPS performance of a communication device comprising the acts of:

exposing a communication device in a test chamber to simulated GPS satellite signals generated using navigation data compiled from GPS satellite signals received over a drive route;

obtaining communication device GPS performance data generated by the communication device, the performance data corresponding to a simulated movement of the communication device over the drive route in response to the exposing; and

comparing the communication device performance data to a baseline unit performance data measured for the same drive route.

2. The method of claim 1, wherein said baseline unit performance data is produced by one of:

compiling performance data on a baseline unit while traveling over the drive route; and

compiling performance data on a baseline unit while exposed to a simulated varying GPS satellite signal generated using said navigation data for the drive route.

3. The method of claim 1, wherein the act of obtaining performance data comprises recording responses of a location based system application within the communication device to the simulated GPS satellite signals.

4. The method of claim 1, wherein the act of obtaining performance data comprises capturing visual responses of the communication device to the simulated GPS satellite signals.

5. The method of claim 1, further comprising the act of:

generating said navigation data from GPS satellite signal data received while traveling over the drive route.

6. The method of claim 1, wherein said drive route data comprises a computer readable code.

7. The method of claim 1, wherein the communication device is also exposed to simulated mobile telephone network signals.

8. The method of claim 1, further comprising the act of:

invoking at least one function of the communication device while the communication device is exposed to the simulated GPS signals.

9. The method of claim 8, wherein the at least one function is call processing, call handoff, or a call feature.

10. The method of claim 8, further comprising the acts of:

identifying a point in the drive route in which an error is produced by the communication device; and

repeating the exposing, and obtaining acts with a modified communication device.

11. The method of claim 10, wherein the modified communication device includes a modification to a location based services application.

12. A method for benchmarking and testing of GPS performance comprising the acts of:

collecting navigation data while traveling over a drive route;

inputting the navigation data to a GPS simulator to generate varying simulated GPS satellite signals corresponding to a travel over the drive route;

exposing a communication device under test conditions to the simulated GPS satellite signals to obtain performance data;

measuring a performance baseline unit'"'"'s location based system application to obtain baseline unit performance data by one of measuring performance of the baseline unit while traveling over the drive route; and

exposing the baseline unit in a test chamber to simulated GPS satellite signals generated from the navigation data collected while traveling over the drive route; and

comparing said performance data to a baseline unit performance data for establishing a benchmark GPS performance of the communication device.

13. A system for benchmarking and testing of a communication device comprising:

a GPS receiver, mounted on a vehicle traveling over a drive route, that compiles navigation data as the vehicle travels over the drive route, wherein drive route data defines the drive route traveled between two end points;

a data storage unit coupled to said GPS receiver that stores said navigation data;

a GPS simulator having an input port receives said navigation data from the data storage unit;

a test chamber that encloses the communication device during a testing process, and that receives inside the test chamber an output signal from the GPS simulator, wherein said output signal comprises a varying GPS satellite signal generated as a function of the drive route data inputted to said GPS simulator; and

a logging unit for recording performance data of the communication device when exposed to said varying GPS signal in the test chamber.

14. The system of claim 13, wherein the navigation data comprises data corresponding to varying GPS satellite signals at the GPS receiver while traveling over the drive route and location data identifying the drive route.

15. The system of claim 13, further comprising:

a recorder for recording GPS performance data of a baseline communication device as the baseline communication device travels over the drive route to establish baseline performance data, wherein the recorder is adapted to record GPS performance data of the baseline communication device obtained by one of actual travel over the drive route and simulated travel over the drive route by use of simulated GPS satellite signals that correspond to the travel over the drive route.

16. The system of claim 13, wherein said performance data is compared to benchmark data to produce a test result of a GPS receiver in said communication device.

17. The system of claim 13, further comprising:

a radio frequency signal simulator outside the test chamber, coupled to a radio frequency antenna inside the test chamber, that outputs a simulated radio frequency signal concurrent with the output signal from the GPS simulator.

18. The system of claim 17, further comprising:

an attenuator control unit connected to the radio frequency signal simulator.

19. The system of claim 18, further comprising:

a timer control connected between the attenuation control unit and the data storage unit, wherein the timer control unit synchronizes output of the navigation data from the data storage unit with the simulated radio frequency signals.