System and measurement method for a dedicated short-range communication on-vehicle coverage system

• US 10,091,670 B2
• Filed: 06/13/2016
• Issued: 10/02/2018
• Est. Priority Date: 06/12/2015
• Status: Active Grant

• Current Assignee: Denso International America Incorporated (DENSO Corporation)
• Original Assignee: Denso International America Incorporated (DENSO Corporation)
• Inventors: Gallagher, Brian
• Primary Examiner(s): Javaid, Jamal
• Application Number:
  US15/180,925
• Publication Number:
  US 20160366598A1
• Time in Patent Office: 841 Days
• CPC Class Codes: G08G 1/161 Decentralised systems, e.g. inter-vehicle communication
• CPC Class Codes: H04L 43/0823 Errors, e.g. transmission errors
• CPC Class Codes: H04L 43/0894 Packet rate
• CPC Class Codes: H04L 43/18 Protocol analysers
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 4/026 using orientation information, e.g. compass
• CPC Class Codes: H04W 4/40 for vehicles, e.g. vehicle-to-pedestrians [V2P]
• CPC Class Codes: H04W 4/46 for vehicle-to-vehicle communication [V2V]
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A computerized method characterizes a dedicated short-range communications (DSRC) system that includes at least one DSRC device for use with a vehicle-to-vehicle communication system. The method includes positioning a vehicle under test (VUT) with the DSRC system at a first location and positioning a DSRC instrumentation antenna at a second location spaced apart from the first location. The method includes varying an azimuth angle between the DSRC device and the instrumentation antenna by performing a rotation of the VUT in place at the first location or the instrumentation antenna in a circular path about the first location. The method includes, for multiple azimuth angles, testing receive performance of the DSRC system by transmitting DSRC packets through the instrumentation antenna to the DSRC system, estimating an error rate indicating a level of success of DSRC packets being received by the DSRC system, and recording the error rate for each angle.

Claims

1. A computerized method of characterizing a dedicated short-range communications (DSRC) system that includes at least one DSRC device for use with a vehicle-to-vehicle communication system, the method comprising:

positioning a vehicle under test (VUT) at a first location, wherein the VUT includes the DSRC system;

positioning a DSRC instrumentation antenna at a second location spaced apart from the first location;

varying an azimuth angle between the DSRC device and the DSRC instrumentation antenna by performing a rotation of (a) the VUT in place at the first location while leaving the DSRC instrumentation antenna fixed in the second location or (b) the DSRC instrumentation antenna in a circular path about the first location while leaving the VUT fixed in the first location; and

for each of a plurality of specified azimuth angles, testing receive performance of the DSRC system by;

transmitting DSRC packets through the DSRC instrumentation antenna to the DSRC system;

receiving DSRC packets at the DSRC system and estimating an error rate indicating a level of success of DSRC packets being received by the DSRC system; and

recording the error rate corresponding to the specified azimuth angle.

2. The method of claim 1 wherein the error rate is a packet error rate.

3. The method of claim 1 wherein the VUT includes an internal combustion engine, the method further comprising placing the internal combustion engine is in a running state while testing the receive performance of the DSRC system.

4. The method of claim 1 further including automatically plotting the error rate as a function of azimuth angle on a graphical display during the rotation.

5. The method of claim 1 wherein the DSRC instrumentation antenna is positioned at the second location at a specified elevation angle relative to a vertical ray originating at the DSRC device.

6. The method of claim 1 further comprising performing the transmitting, receiving, and recording for each of the plurality of specified azimuth angles over a plurality of specified elevation angles between the DSRC device and the DSRC instrumentation antenna.

7. The method of claim 6 further comprising iteratively adjusting the elevation angle between the DSRC device and the DSRC instrumentation antenna after at least one entire instance of the rotation is complete.

8. The method of claim 1 further comprising testing transmit performance of the DSRC system by, for each of the plurality of specified azimuth angles:

instructing the DSRC system to transmit DSRC packets to the DSRC instrumentation antenna;

measuring a radiated power received through the DSRC instrumentation antenna at power measurement instrumentation; and

recording a radiated power value corresponding to the specified azimuth angle based on the measured radiated power.

9. The method of claim 8 further comprising performing a calibration procedure by, while the VUT is not present at the first location:

placing a calibration antenna at the first location;

transmitting a known power level of radiated power from a DSRC packet generator through the calibration antenna;

measuring a power level at the power measurement instrumentation;

calculating a power offset value between the measured power level and the known power level; and

prior to recording the radiated power value based on the measured power, applying the power offset to the measured power.

10. The method of claim 8 wherein the power measurement instrumentation includes a radio frequency (RF) signal analyzer.

11. The method of claim 8 wherein the instructing the DSRC system to transmit DSRC packets is performed by communicating instructions from a test control system to the DSRC system over a telemetry link.

12. The method of claim 11 wherein the telemetry link includes a wireless local area network.

13. The method of claim 1, wherein the varying the azimuth angle between the DSRC device and the DSRC instrumentation antenna is performing by rotating a turntable on which the VUT is positioned.

14. The method of claim 1 further comprising transmitting the error rate for each of the plurality of specified azimuth angles to from the DSRC system to a test control system over a telemetry link.

15. A computerized method of automated antenna design for a dedicated short-range communications (DSRC) system that includes at least one DSRC device for use with a vehicle-to-vehicle communication system, the method comprising:

positioning a vehicle under test (VUT) at a first location, wherein the VUT includes the DSRC system;

positioning a DSRC instrumentation antenna at a second location spaced apart from the first location;

selecting a first value for a first parameter of a configurable antenna of the DSRC system;

configuring the first parameter of the configurable antenna to attain the selected value;

varying an azimuth angle between the DSRC device and the DSRC instrumentation antenna by performing a rotation of the VUT in place at the first location while leaving the DSRC instrumentation antenna fixed in the first location;

performing a transmission test of the DSRC system by, at each of a plurality of specified azimuth angles;

instructing the DSRC system to transmit DSRC packets to the DSRC instrumentation antenna;

measuring a radiated power received through the DSRC instrumentation antenna; and

recording a radiated power value corresponding to the specified azimuth angle based on the measured radiated power;

determining a statistical value representative of the radiated power values for the plurality of specified azimuth angles;

adjusting the selected value to optimize the statistical value; and

selectively repeating the configuring, the varying, the performing, the determining, and the adjusting until an optimized value for the first parameter is determined.

16. The method of claim 15 wherein the first parameter is one of (i) a physical angle between two components of the configurable antenna and (ii) an orientation of at least one component of the antenna with respect to a horizon reference plane parallel to a plane on which the VUT rests.

17. The method of claim 16 wherein the statistical value is a standard deviation and wherein optimizing the statistical value includes minimizing the statistical value.

18. The method of claim 15 further comprising adjusting a location of the configurable antenna on the VUT and selectively repeating the configuring, the varying, the performing, and the determining until an optimized location for the configurable antenna is determined.

19. The method of claim 15 further comprising selectively repeating the configuring, the varying, the performing, the determining, and the adjusting for a second parameter of the configurable antenna until an optimized value for the second parameter is determined.