Patent ID: 8344876

Claim:
A motion monitoring system comprising: a plurality of self-powered active Radio Frequency Identification (RFID) transmitters each intermittently transmitting RF pulses at a rate proportional to motion of a user wearing said RFID transmitters, wherein each RFID transmitter transmits an RF pulse upon reaching a predefined threshold, said RF pulse comprises identification information and motion information pertaining to a pattern of activity being performed by said user, said pattern of activity being quantitatively represented in any of a graphical and mathematical manner, said user comprising a human being, and said pattern of activity comprises predefined movements performed by said user, and wherein said each RFID transmitter comprises a triaxial piezoelectric accelerometer that senses said motion of said user; and a receiver that receives and analyzes said RF pulses produced by each of said RFID transmitters to identify said pattern of activity and produce meaningful data characterizing said pattern of activity, wherein said receiver compares a variance in said pattern of activity with previously saved data of a previous pattern of activity of said user and with data related to a standard, predefined description of said pattern of activity to determine differences over time of the patterns of activity of said user, wherein said receiver calibrates and re-calibrates said RF pulses, wherein said receiver is calibrated and re-calibrated based on said pattern of activity being performed by said user, and wherein the re-calibration of said receiver occurs based on a specific pattern of activity of a particular user compared with said previously saved data and said predefined data.