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Method and apparatus for obtaining traffic situation data
| Details |
Inventors: Fastenrath, Ulrich; Becker, Markus; Ogger, Rainer;
Assignee: Mannesmann AG (Dusseldorf, DE)
Primary Examiner: Zanelli; Michael J.
Assistant Examiner:
Attorney, Agent or Firm: Cohen, Pontani, Lieberman & Pavane
A method for obtaining data on the traffic situation in a road network, wherein a plurality of vehicles involved in road traffic ("floating cars") and equipped with sensory analysis equipment for collecting traffic-relevant sensor data, which include at least one variable representing the current speed v(t) of a given vehicle, wirelessly transmit to a center at chronological intervals individual reports concerning the current traffic situation in the vicinity of the given vehicle determined on the basis of collected sensor data by a data processing device arranged in the vehicle. The individual reports, in addition to containing a classifying interpretation of the traffic situation carried out by the data processing device based on the collected speed variables, which interpretation encompasses at least the class of "traffic-related hold-up" (traffic jam), also contain, as part of the report, a confidence factor F, which represents a measure for the waviness of the chronological profile of the speed variables, especially the vehicle speed v(t), for the period of time to which the given individual report relates. |
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DETAILED DESCRIPTION The object of the invention is therefore to further provide a method by which event reports can be checked with adequate reliability at the center using a method that can be, at least to a great extent, automated.
Further, the invention also provides an apparatus in a vehicle that can be used to collect and transmit traffic situation data in the framework of the method according to the invention.
The invention attains its object in a generic method since the individual reports transmitted to the center from the "floating cars" are composed in a certain way.
First of all, each report includes a classifying interpretation of the traffic situation that exists in the vicinity of the vehicle, which interpretation is provided, on the basis of the collected speed variables, by the data processing device carried in the particular vehicle.
Furthermore, each report also contains a confidence factor F, which is derived by the data processing device from the collected speed variables.
This confidence factor F represents a measurement of the waviness of the chronological profile of the collected speed variables for the time period to which the given report relates.
The speed variables are preferably the current speeds v(t) of the vehicle.
Of course, it is also easy to use other variables of equal informational value for this purpose.
For example, the time needed to travel a predetermined section of the route, or the distance travelled in a predetermined period of time, can be found and transmitted.
The waviness of the speed variable profile refers to a comparison variable that represents information on the "intensity" of the chronological fluctuations of the given speed variable.
A series of approaches can be used for this purpose.
Preferably, the confidence factor F is arrived at as follows: The approximate length of the graph v(t) (i.
e.
, the current speed of the given "floating car" over the time period to which the individual report relates) is calculated.
Then, the length of the graph v(t) is normed utilizing a predetermined reference speed and the measurement frequency f used in collecting the sensor data (i
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