Systems and methods for estimating vehicle speed and hence driving behavior using accelerometer data during periods of intermittent GPS

摘要

A system estimates the speed of a moving vehicle and hence the driving behavior of an individual driving the vehicle using accelerometer data when GPS is intermittent, unavailable, or inaccurate. To do so, the system may first determine time periods when GPS data is not available. For each time period, the system may analyze the accelerometer data to find idling points when the vehicle is not moving. Based on the idling points, the system may divide each time period into segments. The system may then determine the speed of the vehicle at the boundary points of each segment. For each segment, the system may analyze the accelerometer data to determine the acceleration of the vehicle for points when the vehicle is moving. Subsequently, the system may calculate the speed of the vehicle for the points when the vehicle is moving based on the acceleration of the vehicle at those points and the speed of the vehicle at the boundary points.

主权项

1. A computer-implemented method for determining vehicle speed during periods of intermittent GPS, the method comprising:
receiving, via a computer network, one or more of GPS data or accelerometer data corresponding to a driving session of a vehicle; if GPS data is received, determining, by one or more processors, if the GPS data is available or accurate for the entire driving session; determining, by one or more processors, one or more time periods during the driving session when the GPS data is not available or accurate; for each of the one or more time periods when the GPS data is determined to be unavailable or inaccurate, analyzing, by one or more processors, the accelerometer data received during that period to determine idling points when the vehicle is not moving; dividing, by one or more processors, each of the one or more time periods into two or more segments based on the determined idling points for each time period; for each of the two or more segments in each of the one or more time periods:
determining, by one or more processors, a speed of the vehicle at one or more boundary points of each of the two or more segments;analyzing, by one or more processors, the accelerometer data to determine an acceleration of the vehicle in the longitudinal direction for points when the vehicle is moving; andcalculating, by one or more processors, a speed of the vehicle for the points when the vehicle is moving based on the determined acceleration of the vehicle at the points when the vehicle is moving and the speed of the vehicle at the one or more boundary points of each of the two or more segments; and determining, by one or more processors, a driving behavior based on at least the calculated speed of the vehicle at the points when the vehicle is moving in each of the two or more segments in each of the one or more time periods when the GPS data is not available or accurate.