System and method for obtaining vehicle telematics data

A vehicle tag for providing collision information from a vehicle to a server, the vehicle tag being configured to

• (a) be affixed mechanically to, but not require connection electrically to, the vehicle,
• (b) while the vehicle is being driven on trips, sense acceleration of the vehicle,
• (c) generate time-stamped digital acceleration data for the vehicle based on the sensed acceleration, the time-stamped digital acceleration data including X, Y, and Z acceleration values,
• (d) at times during a trip of the vehicle when a mobile device in the vehicle is available for wireless communication with the vehicle tag, achieve a successful connection between the vehicle tag and the mobile device, by the vehicle tag:
• (x) accepting a connection request initiated from the mobile device in response to the vehicle tag advertising its presence, or
• (y) initiating a connection request to the mobile device in response to the mobile device advertising its presence,
• (e) derive from the X, Y, and Z acceleration values, one or more acceleration components in a direction of gravity and one or more acceleration components in a direction normal to gravity,
• (f) determine a possible occurrence of a collision based on a magnitude of the one or more acceleration components in the direction of gravity and of the one or more acceleration components in the direction normal to gravity relative to a predetermined threshold for a predetermined period of time,
• (g) use the successful connection between the mobile device and the vehicle tag to communicate information about the possible occurrence of the collision from the vehicle tag to the mobile device in the vehicle for augmentation with current, near past, and near future position and velocity data from at least one sensor of the mobile device and for communication of the augmented information to the server,
• (h) be in a low-power mode until the sensed acceleration data exceeds a threshold for a certain period of time, and
• (i) revert to a low-power mode when the sensed acceleration data is lower than a threshold for a certain period of time.