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US 5,361,070 AGranted
Ultra-wideband radar motion sensor
AssigneeThe Regents of the University of California
InventorThomas E. McEwan
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Abstract
A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion.
Claims20
An ultra-wideband (UWB) radar motion sensor, comprising:
- a pulse repetition interval generator;
- a fixed reference delay means connected to the pulse repetition interval generator;
- a transmit pulse generator connected to the reference delay means;
- a transmit antenna connected to the transmit pulse generator;
- an adjustable delay means connected to the pulse repetition interval generator;
- a gating pulse generator connected to the adjustable delay means;
- an UWB radar receiver connected to the gating pulse generator;
- a receiver antenna connected to the UWB receiver;
- signal processing means connected to the UWB receiver.
6 more elements
Dependencies are inferred from the claim text.