Abstract: Telematics system wherein a data processor is configured to: calculate a first rotation to isolate horizontal components of orientation data obtained from a three-axis accelerometer; calculate a second rotation of the orientation data dependent on acceleration data obtained from the velocity measuring device; and perform the first and second rotations on the orientation data to calibrate the orientation of the accelerometer relative to a vehicle on which the accelerometer is mounted. An associated method of calibrating the orientation of accelerometer is also provided.

Abstract: There is provided a low-impact crash detection system for a vehicle comprising an accelerometer device from which horizontal components of acceleration are derived, a data processor comprising a FIR bandpass filter to generate filtered horizontal components of acceleration and a communication device for transmitting crash alert information, wherein the data processor is configured to generate an impact energy signal from the filtered horizontal acceleration components, to compare the impact energy signal with a threshold value to determine whether a low-impact crash has taken place, and to generate a crash alert for transmission by the communication device if the threshold value is exceeded. A method of low-impact crash detection is also provided, the method including a crash scoring method.