Automatic/remote rf instrument reading method and apparatus

Details Automatic/remote rf instrument reading method and apparatus Automatic/remote rf instrument reading method and apparatus

H - Electricity

04

B

325/41

H04B 7/24 (2006.01) G01D 4/00 (2006.01) G08C 15/00 (2006.01)

Patent

CA 1254949

Abstract An automatic/remote instrument monitoring system and method are disclosed. RF transponder units are operatively connected to and monitor one or more para- meters of a remotely located instrument. The trans- ponders include RF receivers that sample received RF signals at a low duty cycle and look for a common wake-up signal transmitted from a mobile data collection unit. All transponders receiving the common wake-up signal simultaneously energize their respective trans- mitters and transmit their respective messages over a predetermined RF transmission bandwidth to receivers in the mobile unit. The time and frequency parameters of the transponder transmissions are varied in a manner such that the transmission signals of simultaneously transmitting transponders differ. A plurality of RF receivers in the mobile unit are respectively tuned to collectively receive the transponder transmissions, across the entire transmission bandwidth. Decoding and signal processing circuits in the mobile receiver unit identify transmitting transponders and process their respective messages.

502261

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