HYBRID LOCATION TEST SYSTEM AND METHOD

• US 20130338958A1
• Filed: 03/07/2013
• Published: 12/19/2013
• Est. Priority Date: 06/14/2012
• Status: Active Grant

• Current Assignee: Spirent Communications Incorporated
• Original Assignee: Spirent Communications Incorporated
• Inventors: Shanishchara, Kunal, Butler, Brock, Davis, Jason, Garapaty, Ram, Parameswaran, Manikantan, Pottle, John, Ford, Colin
• Granted Patent: US 9,273,982 B2
• Time in Patent Office: Days
• US Class Current: 702/116
• 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

Abstract

The technology disclosed relates to testing hybrid positioning systems, including systems that rely on MEMS sensors. In particular, it relates to methods and devices for configuring and running tests of hybrid positioning systems.

Claims

1. A method of testing positioning capabilities of a portable device under test, the method including:

communicating with and controlling operation of one or more test instruments, wherein the test instruments include;

a micro-electromechanical sensor signal emulator; and

a GNSS satellite constellation RF signal emulator;

populating a first panel to be displayed with an identification of the test instruments being controlled;

retrieving from storage a test specification file that includes;

a travel path or reference to a travel path followed by the portable device during a test, including for at least the micro-electromechanical sensor signal emulator a pedestrian model or a vehicle ride model that describes orientation and motion of the portable device as it moves along the travel path; and

instructions or references to instructions to be run on the test instruments as the portable device is tested along the travel path;

distributing the retrieved instructions or references to the instructions to the test instruments; and

during the test, populating third and fourth panels to be displayed, respectively, with reports of signals from the micro-electromechanical sensor signal emulator and the GNSS satellite constellation RF signal emulator.

2. The method of claim 1, wherein during the test, populating a second panel to be displayed with a map representing at least a section of the travel path and showing a current location of the portable device.

3. The method of claim 1, wherein the micro-electromechanical sensor signal emulator injects sensor signals representing at least magnetometer directional orientation and inertial acceleration.

4. The method of claim 1, wherein the pedestrian model or the vehicle ride model describes velocity, acceleration and change in acceleration for at least 10 sample points per second.

5. The method of claim 1, wherein the pedestrian model or the vehicle ride model describes velocity, acceleration and change in acceleration for at least 100 sample points per second.

6. The method of claim 1, wherein:

the test instruments further include;

a WiFi access points RF signal emulator; and

a cellular network and RF signal emulator;

further including, during the test, populating fifth and sixth panels to be displayed, respectively, with reports of signals from the WiFi access points RF signal emulator, and the cellular network and RF signal emulator.

7. The method of claim 1, wherein the reports of the signals during the test are received from the test instruments.

8. The method of claim 7, wherein the reports of the signals during the test are also received from the portable device under test.

9. The method of claim 7, further including:

during the test, logging to memory the reports of the signals from the test instruments;

after the test, merging the logged signals from the test instruments with time stamped positions calculated by the portable device; and

processing the data to annotate the logged signals with a comparison of the travel path simulated for the portable device and the positions calculated by the portable device.

10. The method of claim 1, wherein the reports of the signals during the test are received from the portable device under test.

11. The method of claim 1, wherein at least some of the instructions or references to instructions represent parameters for simulation of signals.

12. The method of claim 1, wherein at least some of the instructions or references to instructions represent signal properties to be replayed from signal properties captured during a field survey.

13. The method of claim 2, further including:

during the test, receiving reports from the portable device of a calculated position; and

populating the map with the calculated position and an indication of differential between the current location, according to one or more of the test instruments, and the calculated position, according to the portable device under test.

14. The method of claim 1, further including:

during the test, showing on at least one display panel an overlay of one or more of noise, jamming and fading signal impairments for one or more of the RF signals; and

logging the signal impairments as reported by the test instruments.

15. A method of configuring test instruments to test positioning capabilities of a portable device under test, the method including:

configuring control of operation of one or more test instruments, wherein the test instruments include;

a micro-electromechanical sensor signal emulator;

a GNSS satellite constellation RF signal emulator;

a WiFi access points RF signal emulator; and

a cellular network and RF signal emulator;

populating a first panel to be displayed on a screen with an identification of the test instruments being configured;

retrieving a test specification file that includes;

a travel path or reference to a travel path followed by the portable device during a test; and

instructions or references to instructions to be run on the test instruments as the portable device is tested along the travel path;

distributing the retrieved instructions or references to the instructions to the test instruments;

during the test, populating third, fourth, fifth and sixth panels to be displayed, respectively, with reports of signals from the micro-electromechanical sensor signal emulator, the GNSS satellite constellation RF signal emulator, the WiFi access points RF signal emulator, and the cellular network and RF signal emulator.

16. The method of claim 15, wherein during the test, populating a second panel to be displayed with a map representing at least a section of the travel path and showing a current location of the portable device.

17. A method of configuring test instruments to test positioning capabilities of a portable device under test, the method including:

configuring control of operation of one or more test instruments, wherein the test instruments include;

a micro-electromechanical sensor signal emulator;

a GNSS satellite constellation RF signal emulator;

a WiFi access points RF signal emulator; and

a cellular network and RF signal emulator;

populating a first panel to be displayed on a screen with an identification of the test instruments being configured;

during configuration of a test, populating a second panel to be displayed with a map representing at least a section of a travel path to be followed by the portable device under test;

during configuration of the test, populating an eighth panel to be displayed with editable properties of a selected test instrument that vary with time; and

receiving and persisting edited properties of the selected instruments as a test specification file that includes;

the travel path or reference to the travel path; and

instructions or references to instructions to be run on the test instruments as the portable device is tested along the travel path.

18. The method of claim 17, wherein the travel path further includes a pedestrian model or a vehicle ride model that describes the orientation and motion of the portable device as it travels along the travel path.

19. The method of claim 17, further including:

retrieving the persisted test specification file; and

populating the second and eighth panels with data from the test specification file responsive to selection of a selected test instrument.

20. The method of claim 18, wherein at least some of the instructions or references to instructions represent previously edited parameters for simulation of signals.

21. The method of claim 18, wherein at least some of the instructions or references to instructions represent signal properties captured during a field survey.