System and method for monitoring traffic while preserving personal privacy

• US 11,055,988 B2
• Filed: 08/15/2013
• Issued: 07/06/2021
• Est. Priority Date: 08/17/2012
• Status: Active Grant

• Current Assignee: King Abdullah University of Science and Technology
• Original Assignee: King Abdullah Univercity of Science and Technology
• Inventors: Canepa, Edward, Claudel, Christian, Shamim, Atif, Dehwah, Ahmad, Mousa, Mustafa, Jiang, Jiming
• Primary Examiner(s): Rahman, Mahfuzur
• Application Number:
  US14/421,840
• Publication Number:
  US 20150221217A1
• Time in Patent Office: 2,882 Days
• CPC Class Codes: G08G 1/0112 from the vehicle, e.g. floating car data [FCD]
• CPC Class Codes: G08G 1/0116 from roadside infrastructure, e.g. beacons
• CPC Class Codes: G08G 1/0125 Traffic data processing
• CPC Class Codes: G08G 1/0133 for classifying traffic situation
• CPC Class Codes: G08G 1/0141 for traffic information dissemination
• CPC Class Codes: G08G 1/052 with provision for determining speed or overspeed speed measuring in general G01P
• CPC Class Codes: H04L 2101/69 using geographic information, e.g. room number
• CPC Class Codes: H04L 63/04 for providing a confidential data exchange among entities communicating through data packet networks

Abstract

A traffic monitoring system and method for mapping traffic speed and density while preserving privacy. The system can include fixed stations that make up a network and mobile probes that are associated with vehicles. The system and method do not gather, store, or transmit any unique or identifying information, and thereby preserves the privacy of members of traffic. The system and method provide real-time traffic density and speed mapping. The system and method can further be integrated with a complementary flood monitoring system and method.

Claims

1. A method of monitoring traffic data while preserving privacy, comprising:

receiving at a fixed base station a transmitter signal from a transmitter associated with a vehicle, wherein the transmitter signal comprises speed information of the vehicle and wherein no personal identifying information associated with the vehicle and occupants of the vehicle is transmitted;

estimating with a processor of the fixed base station a position of the transmitter; and

mapping the position to a roadway to create traffic data,

wherein the transmitter and the fixed base station are tuned on one or more frequencies that are not shared by cellular phones, and

wherein the traffic data comprises a density and speed map.

2. The method of monitoring traffic data while preserving privacy of claim 1, further comprising powering the transmitter from a power system of the vehicle.

3. The method of monitoring traffic data while preserving privacy of claim 1, further comprising:

recording a result of estimating the position or mapping the position.

4. The method of monitoring traffic data while preserving privacy of claim 3, further comprising:

estimating a state of traffic on the roadway, wherein the state is estimated based on the result.

5. The method of monitoring traffic data while preserving privacy of claim 4, wherein the state is estimated by a data fusion technique.

6. The method of monitoring traffic data while preserving privacy of claim 5, wherein the estimated state comprises density and the data fusion technique is mixed-integer linear programming.

7. The method of monitoring traffic data while preserving privacy of claim 4, wherein the estimated state is sent to a database.

8. The method of monitoring traffic data while preserving privacy of claim 7, wherein the estimated state is sent to a database using multi-hop communications between fixed nodes of a fixed transmitter infrastructure.

9. The method of monitoring traffic data while preserving privacy of claim 7, wherein the transmitter relays and forwards data to fixed nodes of a fixed transmitter infrastructure.

10. The method of monitoring traffic data while preserving privacy of claim 1, wherein the transmitter is decoupled from phone and satellite devices.

11. The method of monitoring traffic data while preserving privacy of claim 1, wherein the transmitter signal is received by a fixed sensor network.

12. The method of monitoring traffic data while preserving privacy of claim 1, wherein the position is estimated by one or more of trilateration, received signal strength measuring, and a tracking device coupled to the transmitter.

13. A traffic monitoring system for monitoring and mapping traffic flow while preserving privacy, comprising:

a mobile transmitter comprising a transmitter microcontroller and a wireless transmitter, the mobile transmitter configured to transmit speed information associated with the mobile transmitter; and

a fixed transmitter infrastructure comprising stations with fixed locations for receiving the speed information,

wherein each of the stations comprises a station microcontroller and a wireless station transmitter;

wherein the fixed transmitter infrastructure estimates a position of the mobile transmitter,

wherein the traffic monitoring system does not collect or store any personal identifying information associated with the mobile transmitter,

wherein the mobile transmitter and the fixed transmitter infrastructure are tuned to operate on the same frequency, which is not shared by cellular phones,

wherein the traffic monitoring system is configured to create traffic data based on the received speed information and the position of the mobile transmitter, and

wherein the traffic data comprises a density and speed map.

14. The traffic monitoring system of claim 13, wherein the mobile transmitter is integrated into a vehicle.

15. The traffic monitoring system of claim 14, wherein the mobile transmitter is powered by the vehicle.

16. The traffic monitoring system of claim 15, wherein the mobile transmitter is configured to obtain vehicle speed data from the vehicle.

17. The traffic monitoring system of claim 16, wherein the fixed transmitter infrastructure is configured to receive data from the mobile transmitter, to estimate a position of the vehicle, and to map the position to a road.

18. The traffic monitoring system of claim 17, further comprising at least one additional mobile transmitter.

19. The traffic monitoring system of claim 18, wherein the fixed transmitter infrastructure is configured to monitor any or all of the mobile transmitter and the one additional mobile transmitter when whichever of the mobile transmitter and the at least one additional mobile transmitter are within communication range.

20. The traffic monitoring system of claim 13, wherein the traffic monitoring system is configured to estimate a state of local traffic based on the traffic data.

21. The traffic monitoring system of claim 19, wherein the traffic monitoring system is configured to estimate a state of local traffic using a data fusion technique.

22. The traffic monitoring system of claim 19, wherein the data fusion technique is mixed-integer linear programming.

23. The traffic monitoring system of claim 19, wherein all of the mobile transmitter and the at least one additional mobile transmitter are vehicle components which are not configured to store or gather personal identifying information.

24. The traffic monitoring system of claim 16, further comprising at least one additional mobile transmitter.

25. The traffic monitoring system of claim 24, wherein the transmitter and the at least one additional mobile transmitter are configured to communicate with one another.

26. The traffic monitoring system of claim 25, wherein the transmitter and the at least one additional transmitter are configured to act as relays for forwarding data to the station when one or more of the transmitter and the at least one additional transmitter are beyond communication range of the fixed transmitter infrastructure.

27. The traffic monitoring system of claim 13, wherein the fixed transmitter infrastructure comprises a plurality of stations, each with a unique fixed location.

28. The traffic monitoring system of claim 27, wherein the fixed transmitter infrastructure is configured to receive data from the mobile transmitter and map the position.

29. The traffic monitoring system of claim 28, wherein the fixed transmitter infrastructure is configured to monitor the mobile transmitter when the mobile transmitter is within communication range, and wherein the traffic monitoring system is configured to create traffic data based on the monitoring.

30. The traffic monitoring system of claim 29, wherein the traffic monitoring system does not collect or store any personal identifying information.

31. The traffic monitoring system of claim 30, wherein the traffic monitoring system is configured to estimate a state of local traffic based on the traffic data.

32. The traffic monitoring system of claim 30, wherein the traffic monitoring system is configured to estimate a state of local traffic using mixed-integer linear programming.

33. The traffic monitoring system of claim 13, wherein the system is decoupled from phone and satellite devices.

34. The traffic monitoring system of claim 13, wherein the mobile transmitter comprises a back end, a front end, or both, wherein the back end transforms data for modulation onto a wireless carrier, and wherein the front end comprises an integrated circuit.

35. A method of monitoring traffic data while preserving privacy, comprising:

providing at least one transmitter associated with a vehicle, wherein the at least one transmitter is configured to transmit data that includes speed information of the vehicle;

providing a fixed transmitter infrastructure configured to receive the data from the at least one transmitter and estimating a position of the at least one transmitter; and

creating traffic data based on the speed information and the estimated position of the at least one transmitter,

wherein a traffic monitoring system that includes the at least one transmitter and the fixed transmitter infrastructure does not collect or store any personal identifying information associated with the vehicle and occupants of the vehicle,

the fixed transmitter infrastructure and the at least one transmitter are tuned on one or more frequencies that are not shared by cellular phones, and

wherein the traffic data comprises a density and speed map.

36. The method of monitoring traffic data while preserving privacy of claim 35, wherein each of the at least one transmitter is decoupled from phone and satellite devices.

37. The method of monitoring traffic data while preserving privacy of claim 35, wherein each of the at least one transmitter comprises a transmitter microcontroller and a half duplex wireless transmitter.

38. The method of monitoring traffic data while preserving privacy of claim 37, wherein the fixed transmitter infrastructure comprises at least one fixed station and wherein each of the at least one fixed station comprises a fixed station microcontroller and one of a fixed station half duplex wireless transmitter and a fixed station full duplex wireless transmitter.

39. The method of monitoring traffic data while preserving privacy of claim 38, further comprising:

integrating each of the at least one transmitter into separate vehicles, wherein each of the at least one transmitters is powered by the vehicle into which the at least one transmitter is integrated;

wherein the fixed transmitter infrastructure and each of the at least one transmitter are tuned to operate on the same frequency.

40. The method of monitoring traffic data while preserving privacy of claim 39, further comprising:

measuring vehicle speed and vehicle position of each vehicle within the communication range of the fixed transmitter infrastructure or the at least one transmitter; and

mapping the position of each vehicle.

41. The method of monitoring traffic data while preserving privacy of claim 39, wherein each of the at least one transmitter acts as a relay when outside the communication range of the fixed transmitter infrastructure in order to forward measured data to a database using multi-hop communications.

42. The method of monitoring traffic data while preserving privacy of claim 39, wherein no personal identifying information is collected or stored during monitoring traffic speed and density.

43. The method of monitoring traffic data while preserving privacy of claim 39, wherein none of the at least one transmitter is coupled to phone or satellite devices.