System and Method for Determining Vehicle Position Based Upon Light-Based Communication Using Signal-to-Noise Ratio or Received Signal Strength Indicator

• US 20180217229A1
• Filed: 02/02/2017
• Published: 08/02/2018
• Est. Priority Date: 02/02/2017
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Shukla, Vimlesh, Spaulding, Jeremy, Anthony, Mervyn
• Granted Patent: US 10,254,382 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/10 using transmission of interrupted, pulse-modulated waves determination of distance by phase measurements G01S17/32
• CPC Class Codes: G01S 17/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S17/46
• CPC Class Codes: G01S 17/86 Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/931 of land vehicles
• CPC Class Codes: G01S 5/16 using electromagnetic waves other than radio waves
• CPC Class Codes: G05D 1/0214 in accordance with safety or protection criteria, e.g. avoiding hazardous areas monitoring the location of vehicles within a certain area, e.g. forbidden or allowed areas, in traffic control systems for road vehicles G08G1/13
• CPC Class Codes: G08C 23/00 Non-electrical signal transmission systems, e.g. optical systems
• CPC Class Codes: G08G 1/16 Anti-collision systems road vehicle drive control systems for predicting or avoiding probable or impending collision otherwise than by control of a particular sub-unit B60W30/08
• CPC Class Codes: G08G 1/163 involving continuous checking
• CPC Class Codes: G08G 1/166 for active traffic, e.g. moving vehicles, pedestrians, bikes
• CPC Class Codes: H04B 10/07 Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04B 10/502 LED transmitters
• CPC Class Codes: H04B 10/80 Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water

Abstract

A system and method for determining vehicle position uses light based communication (LBC) signals and a received signal strength indicator (RSSI) to determine the vehicle position. Each vehicle includes a LBC system having an array of transmitting light emitting diodes (LEDs) and an array of receiver photodiodes for transmitting and receiving pulsed light binary messages. Each LBC system has a controller coupled to the transmitter diodes and receiver diodes. The controller includes a vehicle communication module that may be executed by a processor to determine the distance. The processor models a first distance between a first transmitting LBC system and a first receiving LBC system, then models a second distance between a second transmitting LBC system and the first receiving LBC system, and then determines the distance between the first vehicle and the second vehicle using trilateration of the first distance and the second distance.

Claims

1. A first light based communication (LBC) system for determining vehicle position, the system comprising:

a transmitter array of light emitting diodes (LEDs);

a receiver array of photodiodes; and

a controller coupled to the transmitter array of LEDS and to the receiver array of photodiodes, the controller including

a processor configured to determine a relative distance between a first vehicle and a second vehicle based on a first signal parameter of a first digital message received at the receiver array of photodiodes.

2. The system of claim 1, wherein the first signal parameter is a received signal strength indicator (RSSI) of the first digital message.

3. The system of claim 1, wherein the processor is further configured to use trilateration to determine the relative distance between the first vehicle and the second vehicle based on the first signal parameter and a second signal parameter of a second digital message received at the receiver array of photodiodes.

4. The system of claim 3, wherein the processor is further configured to use trilateration by modeling a first distance based on the first signal parameter, modeling a second distance based on the second signal parameter, and determining the relative distance between the first vehicle and the second vehicle based on the first distance and the second distance.

5. The system of claim 3, wherein the second signal parameter is a RSSI of the second digital message.

6. The system of claim 1, wherein the first digital message includes a header that identifies a second LBC system on the second vehicle with respect to a position of the first LBC system on the first vehicle, and wherein the second LBC system is configured to transmit the first digital message.

7. The system of claim 1, wherein the first LBC system is configured to be integrated into at least one of:

a driver headlight assembly, a passenger headlight assembly, a driver taillight assembly, and a passenger taillight assembly.

8. A method for determining vehicle position based upon light based communication (LBC), the method comprising:

receiving, at a receiver array of photodiodes in a first LBC system of a first vehicle, a first digital message, the first digital message being received from a second LBC system of a second vehicle;

measuring, by a processor coupled to the receiver array of photodiodes, a first signal parameter of the first digital message; and

using trilateration to determine a relative distance between the first vehicle and the second vehicle based at least in part on the first signal parameter of the first digital message.

9. The method of claim 8, wherein using trilateration to determine the relative distance between the first vehicle and the second vehicle comprises:

receiving, at the receiver array of photodiodes, a second digital message from a third LBC system of the second vehicle;

measuring, by the processor, a second signal parameter of the second digital message; and

using the first signal parameter and the second signal parameter to determine the relative distance.

10. The method of claim 9, wherein the second signal parameter is a RSSI of the second digital message.

11. The method of claim 9, wherein using the first signal parameter and the second signal parameter to determine the relative distance comprises:

modeling a first distance between the second LBC system of the second vehicle and the first LBC system of the first vehicle based on the first signal parameter;

modeling a second distance between the third LBC system of the second vehicle and the first LBC system of the first vehicle based on the second signal parameter; and

using trilateration to determine the relative distance between the first vehicle and the second vehicle based on the first distance and the second distance.

12. The method of claim 9, the method further comprising analyzing the first digital message to determine a position of the second LBC system on the second vehicle.

13. The method of claim 8, wherein the first signal parameter is a received signal strength indicator (RSSI) of the first digital message.

14. A computer program product comprising one or more non-transitory processor-readable mediums encoded with instructions that when executed by one or more processors cause a process to be carried out for determining vehicle position using light based communication (LBC), the process comprising:

measuring a first signal parameter of a first digital message received by a receiver array of photodiodes in a first LBC system of a first vehicle and received from a second LBC system of a second vehicle; and

using trilateration to determine a relative distance between the first vehicle and the second vehicle based on the first signal parameter.

15. The computer program product of claim 14, wherein the first signal parameter is a received signal strength indicator (RSSI) of the first digital message.

16. The computer program product of claim 14, wherein using trilateration to determine the relative distance comprises:

receiving, at the receiver array of photodiodes, a second digital message from a third LBC system of the second vehicle;

measuring a second signal parameter of the second digital message; and

using the first signal parameter and the second signal parameter to determine the relative distance.

17. The computer program product of claim 16, wherein the second signal parameter is a RSSI of the second digital message.

18. The computer program product of claim 16, wherein using the first signal parameter and the second signal parameter to determine the relative distance comprises:

modeling a first distance between the second LBC system of the second vehicle and the first LBC system of the first vehicle based on the first signal parameter;

modeling a second distance between the third LBC system of the second vehicle and the first LBC system of the first vehicle based on the second signal parameter; and

using trilateration to determine the relative distance between the first vehicle and the second vehicle based on the first distance and the second distance.

19. The computer program product of claim 18, wherein the process further comprises analyzing the first digital message to determine a position of the second LBC system on the second vehicle.