Window glass breakage detection based on acceleration

摘要

A telematics device mounted on a vehicle or other housing is useful for detecting a glass break event on a vehicle or housing window based on acceleration measurements obtained from an acceleration sensor of the telematics device. A power spectral density (PSD) for a plurality of packets of acceleration data in a high frequency band and / or a low frequency band is determined. A glass break event is detected by determining that the average PSD for the high frequency band has exceeded the high PSD threshold. Alternatively or additionally, the glass breakage event is that the second maximum PSD is greater than the first PSD threshold for the low frequency band and the difference between the second maximum PSD and the minimum PSD is less than the second PSD for the low frequency band. It is detected by determining that it is large. [Selection diagram] Fig. 1