REAL-TIME VEHICLE POSITION DETERMINATION USING COMMUNICATIONS WITH VARIABLE LATENCY
First Claim
1. A method for tracking a vehicle in an electronic toll collection (ETC) system, the vehicle having a transponder configured to communicate with a roadside processor using a wide area RF communications protocol when in a coverage area of the system, the coverage area including a section of a multilane roadway through which vehicles travel, the method comprising:
- receiving at least one RF signal from the transponder, the at least one RF signal containing position data and a recorded time, wherein the recorded time is a time at which the position data was recorded by the transponder; and
predicting the position of the vehicle at a future time based on the position data and the recorded time.
8 Assignments
0 Petitions
Accused Products
Abstract
A system and method for predicting the location of a vehicle in an electronic toll collection system employing a wide area communication protocol. The vehicle includes a transponder that sends reports regarding the position of the vehicle and the time at which the position was determined. The system includes a vehicle position predictor for estimating the future position of the vehicle within a roadway based on two or more reports of past positions and the times at which they were recorded. Speed data or other data impacting likely future position may also be reported and factored into the estimate. The estimate of future position may be used in connection with triggering enforcement measures, timing a toll transaction, integrating wide area toll communications into a legacy toll transaction system, or for other applications.
-
Citations
30 Claims
-
1. A method for tracking a vehicle in an electronic toll collection (ETC) system, the vehicle having a transponder configured to communicate with a roadside processor using a wide area RF communications protocol when in a coverage area of the system, the coverage area including a section of a multilane roadway through which vehicles travel, the method comprising:
-
receiving at least one RF signal from the transponder, the at least one RF signal containing position data and a recorded time, wherein the recorded time is a time at which the position data was recorded by the transponder; and predicting the position of the vehicle at a future time based on the position data and the recorded time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. An electronic toll collection (ETC) system for conducting toll transactions with a vehicle travelling in a multilane roadway, the vehicle having a transponder configured to communicate using a wide area communications protocol, the system comprising:
-
an RF communications unit and antenna having a coverage area encompassing a section of the multilane roadway through which the vehicles travel; a wide area reader configured to communicate with the transponder via the RF communications unit and antenna, the wide area reader including a vehicle position predictor configured to receive at least one RF signal from the transponder, the at least one RF signal containing position data and a recorded time, wherein the recorded time is a time at which the position data was recorded by the transponder, and wherein the vehicle position predictor is configured to predict the position of the vehicle at a future time based on the position data and the recorded time; and a roadside controller for conducting ETC transactions, wherein the roadside controller is adapted to receive data from the vehicle position predictor and to conduct an ETC transaction in relation to the vehicle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification