Interference resistant wireless sensor and control system
First Claim
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1. A wireless data transmission method comprising:
- detecting an event occurrence;
obtaining remote sensor data in response to said event occurrence;
inserting said remote sensor data into a first data packet;
transmitting the first data packet using a first carrier frequency; and
transmitting a second data packet containing the remote sensor data using a second carrier frequency;
wherein the content of said second data packet is identical to the content of said first data packet, and wherein said first data packet further comprises a unique transmitter unit identifier, a current sequence number, and historical remote sensor data obtained before obtaining said remote sensor data.
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Abstract
A wireless sensor and control system includes wireless RF transmitter units and one or more receivers that communicate using more than one narrowband radio channel to provide increased reliability in the presence of unintentional radio interference. The output of a sensor transducer or closure of a switch contact can trigger transmissions at two or more narrowband carrier frequencies that are subsequently decoded by the receiver(s). The remote sensor data can then be passed to another system for processing and/or utilized to control remote devices. In accordance with one practical embodiment, the remote sensor data indicates the ingress or egress of monitored product inventory.
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Citations
11 Claims
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1. A wireless data transmission method comprising:
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detecting an event occurrence; obtaining remote sensor data in response to said event occurrence; inserting said remote sensor data into a first data packet; transmitting the first data packet using a first carrier frequency; and transmitting a second data packet containing the remote sensor data using a second carrier frequency; wherein the content of said second data packet is identical to the content of said first data packet, and wherein said first data packet further comprises a unique transmitter unit identifier, a current sequence number, and historical remote sensor data obtained before obtaining said remote sensor data. - View Dependent Claims (2)
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3. A wireless data transmitter unit comprising:
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a controller configured to obtain remote sensor data generated in response to an event occurrence, and to create data packets containing said remote sensor data; a number of sensors coupled to said controller and configured to detect said event occurrence; and a transmitter arrangement coupled to said controller and configured to transmit at least a first data packet containing said remote sensor data using a first carrier frequency, and a second data packet containing said remote sensor data using a second carrier frequency; wherein the content of said second data packet is identical to the content of said first data packet, and wherein said number of sensors comprises a plurality of switches.
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4. A wireless data transmitter unit comprising:
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a controller configured to obtain remote sensor data generated in response to an event occurrence, and to create data packets containing said remote sensor data; and a transmitter arrangement coupled to said controller and configured to transmit at least a first data packet containing said remote sensor data using a first carrier frequency, and a second data packet containing said remote sensor data using a second carrier frequency; wherein the content of said second data packet is identical to the content of said first data packet, and wherein said controller is configured to create data packets containing at least said remote sensor data, a unique transmitter unit identifier, a current sequence number, and historical remote sensor data obtained before obtaining said remote sensor data. - View Dependent Claims (5)
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6. A wireless data reception method comprising:
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receiving, on a first carrier frequency, a first data packet containing remote sensor data; and receiving, on a second carrier frequency, a second data packet containing said remote sensor data, wherein the content of said second data packet is identical to the content of said first data packet; wherein said first data packet contains at least said remote sensor data, a unique transmitter unit identifier, a current sequence number, and historical remote sensor data. - View Dependent Claims (7, 8)
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9. A wireless data receiving arrangement comprising:
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a first receiver element configured to receive, on a first carrier frequency, a first data packet containing remote sensor data; and a second receiver element configured to receive, on a second carrier frequency, a second data packet containing said remote sensor data, wherein the content of said second data packet is identical to the content of said first data packet wherein said first data packet and said second data packet each contains at least said remote sensor data, a unique transmitter unit identifier, a current sequence number, and historical remote sensor data. - View Dependent Claims (10, 11)
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Specification