US Patent 7119695 Advanced house arrest tracker system

A docking station is located in an offender's home. It is connected to a transformer, and a wireless modem. The docking station includes a processor board containing a microprocessor which receives the offender's home schedule from a central monitoring station via a cellular network and communicates with a miniature tracking device positioned in the docking station when the offender is at home and on the belt of an offender when he is away from home. The miniature tracking device receiving GPS signals. A tamper resistant bracelet transmitter permanently positioned on the offender's ankle communicates by wireless transmission to the tracking device.