Method and system for detecting frequent lane changes of moving vehicles
First Claim
1. A method for detecting frequent lane changes of moving vehicles, comprising following steps:
- extracting Z axis angular velocities from triaxial angular velocities obtained by a sensor of a vehicle in a moving process of the vehicle;
multiplying every two adjacent Z axis angular velocities;
storing the Z axis angular velocities in a time period, the time period starting at a time corresponding to when a result of multiplying two adjacent Z axis angular velocities is negative and lasting for a first time value;
determining whether a time interval between two time points corresponding to adjacent Z axis angular velocities with a numeral value of zero reaches a second time value when the number of the Z axis angular velocities with a value of zero reaches a first threshold value in the time period, and when the time interval reaches the second time value, determining whether an absolute value of a Z axis angular velocity of the vehicle at a third time value, which occurs after the time when a Z axis angular velocity of the vehicle is zero, reaches a second threshold value;
determining that the vehicle has made frequent lane changes in the moving process in the time period, when it is determined that the absolute value of the Z axis angular velocity of the vehicle at the third time reaches the second threshold value,wherein the first threshold value is a natural number that is more than 2.
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Abstract
A method and system for detecting frequent lane changes of moving vehicles are disclosed. A method for detecting frequent lane changes of moving vehicles including extracting the Z axis angular velocity values, and storing those Z axis angular velocities, from the Z axis angular velocity of which numerical product is negative, analyzing the Z axis angular velocities stored in the specific time period, and judging the number of the Z axis angular velocities with the numeral number 0. It is determined whether the vehicle has made frequent lane changes or not in its moving process, so that an active monitoring for vehicle travelling statuses is implemented, thereby normalizing driving behaviors, and reducing traffic accidents.
10 Citations
7 Claims
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1. A method for detecting frequent lane changes of moving vehicles, comprising following steps:
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extracting Z axis angular velocities from triaxial angular velocities obtained by a sensor of a vehicle in a moving process of the vehicle; multiplying every two adjacent Z axis angular velocities; storing the Z axis angular velocities in a time period, the time period starting at a time corresponding to when a result of multiplying two adjacent Z axis angular velocities is negative and lasting for a first time value; determining whether a time interval between two time points corresponding to adjacent Z axis angular velocities with a numeral value of zero reaches a second time value when the number of the Z axis angular velocities with a value of zero reaches a first threshold value in the time period, and when the time interval reaches the second time value, determining whether an absolute value of a Z axis angular velocity of the vehicle at a third time value, which occurs after the time when a Z axis angular velocity of the vehicle is zero, reaches a second threshold value; determining that the vehicle has made frequent lane changes in the moving process in the time period, when it is determined that the absolute value of the Z axis angular velocity of the vehicle at the third time reaches the second threshold value, wherein the first threshold value is a natural number that is more than 2. - View Dependent Claims (2, 5, 6, 7)
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3. A system for detecting frequent lane changes in moving vehicles, comprising:
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a data extracting module configured for extracting Z axis angular velocities from tri-axial angular velocities obtained by a sensor of a vehicle in a moving process of the vehicle; a data storing module configured for storing Z axis angular velocities in a time period when a result of multiply operation of two adjacent Z axis angular velocities is negative in the Z axis angular velocities;
the specific time period starts from a time point when the result of multiply operation of two adjacent Z axis angular velocities is negative and lasts for a first time value; anda frequent lane changes judging module configured for; when the number of the Z axis angular velocities with a value of zero reaches a first threshold value in the time period, judging whether a time interval between two time points corresponding to adjacent Z axis angular velocities with a numeral value of zero reaches a second time value;
when the time interval between two time points corresponding to adjacent Z axis angular velocities with a numeral value of zero reaches the second time value, further judging whether an absolute value of a Z axis angular velocity of the vehicle at a third time value after the time when a Z axis angular velocity of the vehicle is 0 reaches a second threshold value;when the absolute value of the Z axis angular velocity of the vehicle at a third time value after the time when the Z axis angular velocity of the vehicle is 0 reaches the second threshold value, determining that the vehicle has made frequent lane changes in the moving process in the time period; wherein the first threshold value is a natural number that is more than 2. - View Dependent Claims (4)
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Specification