Patent ID: 7409188

Claim:
An apparatus, comprising: a ranging receiver, responsive to power control signals based on sensor signals indicating whether the ranging receiver is in motion, the power control signals for powering off selected components of the ranging receiver so as to put the ranging receiver in a standby mode as opposed to a fully active mode or a fully powered off mode, or powering on the selected components of the ranging receiver so as to put the ranging receiver in a fully active mode; and a motion sensor, mechanically coupled to the ranging receiver so as to move when the ranging receiver moves, configured to provide the sensor signals, wherein the selected components of the ranging receiver is powered off if the sensor signals indicate the ranging receiver is stationary, and wherein the selected components of the ranging receiver is powered on if the sensor signals indicate the ranging receiver is in motion, or if a time since the powering off of the selected components of the ranging receiver has exceeded a predetermined time.