System and method for speed estimation, detection and ranging using visible light in vehicles
First Claim
Patent Images
1. An apparatus for determining the speed of a vehicle, comprising,(a) a photodetector, said photodetector at least for emitting a signal representative of a light power received thereby;
- (b) a CPU in electronic communication with said photodetector, said CPU at least for reading a signal from said photodetector;
(c) a display device in electronic communication with said CPU;
(d) computer memory in communication with said CPU, said computer memory containing a plurality of commands for executing at least the following steps(1) determining values for K, γ
, and d, where,K is a constant value that represents a minimum path loss at a reference distance,γ
is a constant that represents a light power'"'"'s rate of change as a function of distance, and,d is a constant that represents a distance between the vehicle'"'"'s line of motion and a position of the photodetector;
(2) reading said photodetector, thereby acquiring a Pr(t) value, where Pr(t) is a power level received from the vehicle at a time t;
(3) performing step (2) a plurality of times, thereby acquiring a plurality of different Pr(t) values at a plurality of different time values;
(4) using at least said determined values for K, γ
, and d, and said plurality of Pr(t) values to obtain an estimate of said speed of said vehicle by solving the equation;
2 Assignments
0 Petitions
Accused Products
Abstract
There is provided herein a visible light-based speed estimation method ViLDAR. By using the received light intensity of a vehicle'"'"'s LED headlight, the vehicle speed can be accurately estimated for a wide range of incidence angle. Linear LS method is used in one embodiment of a speed estimation algorithm. The impact of system parameters on speed estimation error and the performance of algorithm for different speed and estimation duration are provided. Some embodiments operate best at a certain distances where the received light intensity (power) reading can provide estimation results with high accuracy, which distances are termed a reliable region of operation. In addition to speed estimation, potential applications of ViLDAR idea are ranging detection and collision avoidance for autonomous vehicles.
4 Citations
15 Claims
-
1. An apparatus for determining the speed of a vehicle, comprising,
(a) a photodetector, said photodetector at least for emitting a signal representative of a light power received thereby; -
(b) a CPU in electronic communication with said photodetector, said CPU at least for reading a signal from said photodetector; (c) a display device in electronic communication with said CPU; (d) computer memory in communication with said CPU, said computer memory containing a plurality of commands for executing at least the following steps (1) determining values for K, γ
, and d, where,K is a constant value that represents a minimum path loss at a reference distance, γ
is a constant that represents a light power'"'"'s rate of change as a function of distance, and,d is a constant that represents a distance between the vehicle'"'"'s line of motion and a position of the photodetector; (2) reading said photodetector, thereby acquiring a Pr(t) value, where Pr(t) is a power level received from the vehicle at a time t; (3) performing step (2) a plurality of times, thereby acquiring a plurality of different Pr(t) values at a plurality of different time values; (4) using at least said determined values for K, γ
, and d, and said plurality of Pr(t) values to obtain an estimate of said speed of said vehicle by solving the equation; - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method for determining the speed of a vehicle, wherein is provided a photodetector, comprising the steps of:
-
(a) determining values for K, γ
, and d, where,K is a constant value that represents a minimum path loss at a reference distance, γ
is a constant that represents a light power'"'"'s rate of change as a function of distance, and,d is a constant that represents a distance between the vehicle'"'"'s line of motion and a position of the photodetector; (b) reading said photodetector, thereby acquiring a Pr(t) value, where Pr(t) is a power level received from the vehicle at a time t; (c) performing step (b) a plurality of times, thereby acquiring a plurality of different Pr(t) values at a plurality of different time values; (d) using at least said determined values for K, γ
, and d, and said plurality of Pr(t) values to obtain an estimate of said speed of said vehicle by solving the equation; - View Dependent Claims (7, 8, 9, 10, 11)
-
-
12. An apparatus for determining the speed of a vehicle, comprising,
(a) a photodetector, said photodetector at least for emitting a signal representative of a light power received thereby; -
(b) a CPU in electronic communication with said photodetector, said CPU at least for reading a signal from said photodetector; (c) a display device in electronic communication with said CPU; (d) computer memory in communication with said CPU, said computer memory containing a plurality of commands for executing at least the following steps (1) determining values for K, γ
, and d, where,K is a constant value that represents a minimum path loss at a reference distance, γ
is a constant that represents a light power'"'"'s rate of change as a function of distance, and,d is a constant that represents a distance between the vehicle'"'"'s line of motion and a position of the photodetector; (2) reading said photodetector, thereby acquiring a Pr(t) value, where Pr(t) is a power level received from the vehicle at a time t; (3) performing step (2) a plurality of times, thereby acquiring a plurality of different Pr(t) values at a plurality of different time values; (4) using at least said determined values for K, γ
, and d, and said plurality of Pr(t) values to obtain an estimate of said speed of said vehicle by solving the equation; - View Dependent Claims (13, 14, 15)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeBoard of Regents of Oklahoma State University, Ozyegin Universitesi
-
Original AssigneeBoard of Regents of Oklahoma State University
-
InventorsAbuella, Hisham Fadlallah M., Ekin, Sabit, Uysal, Murat
-
Primary Examiner(s)Marini, Matthew G
-
Application NumberUS16/057,239Publication NumberTime in Patent Office763 DaysField of SearchUS Class CurrentCPC Class CodesG01P 3/36 Devices characterised by th...
