Remote data acquisition and communication system

• US 5,448,230 A
• Filed: 06/25/1993
• Issued: 09/05/1995
• Est. Priority Date: 06/25/1993
• Status: Expired due to Term

• Current Assignee: MTSCN Acquisition Corp.
• Original Assignee: Metscan, Inc. (Itron, Inc.)
• Inventors: Hollands, Daniel H., Schanker, Jacob Z.
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Burgess, Glenton B.
• Application Number:
  US08/081,190
• Time in Patent Office: 802 Days
• Field of Search: 340/539, 340/310 R, 340/310 A, 340/825.54, 340/825.52, 340/825.03, 340/825.07, 340/825.06, 340/825.11, 340/825.13, 340/310.07 , 340/310.02, 375/1
• US Class Current: 340/870.03
• CPC Class Codes: G08C 15/00 Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
• CPC Class Codes: H04Q 2209/40 using a wireless architecture
• CPC Class Codes: H04Q 2209/60 for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
• CPC Class Codes: H04Q 2209/75 by polling or interrogating the sub-stations
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

A remote data acquisition and communication system includes a plurality of collector devices including a radio transmitter, optionally a plurality of concentrator devices including a radio transmitter, a radio receiver and a memory, a plurality of controller devices including a radio transmitter, a radio receiver and a memory, optionally a plurality of data communications nodes coupled to corresponding concentrator devices via a first communications link, and a data management platform computer coupled to the data communications nodes or the next lower level of devices via a second communications link. The collector devices, concentrator devices and controller devices communicate with one another via RF communications, preferably a single communication channel at a single carrier frequency. The collector devices preferably transmit data to the concentrator devices at intervals of between 4 to 6 hours and in preferred transmission bursts of less than 200 milliseconds, to minimize collisions between transmissions from different collector devices, and the transmitted data is sorted and redundancies discarded for each desired period of data keeping, i.e., typically daily.

Claims

1. A remote data acquisition and communication system, comprising:

a large number of data collector devices each comprising a radio transmitter, with all of said radio transmitters designed to transmit at the same carrier frequency and each of said collector devices designed to transmit a data transmission at said frequency at each of a plurality of specified intervals of substantially identical duration, each collector device being designed to pseudo-randomly select the time of its first data transmission after it is at a random time first supplied with electrical power, and each collector device being designed to pseudo-randomly very slightly change the duration of the interval between its data transmissions, whereby said time intervals for each collector device have beginning and end times which are independently randomly related to those of other collector devices in the system;

and a plurality of controller devices, each including a radio transmitter also designed to operate at said carrier frequency, a radio receiver for receiving data transmissions at said carrier frequency, and a memory for storing received data;

and a data management platform computer for receiving data transmissions, controlling the system and processing the received data.

2. The system of claim 1, wherein said data management platform computer is coupled to each controller device via a two-way communications link.

3. The system of claim 1, wherein the radio transmitter transmits collected data at specified time intervals of about 4 to 6 hours.

4. The system of claim 1, wherein the radio transmitter transmits collected data at specified time intervals of about 6 hours.

5. The system of claim 1, additionally comprising a plurality of data communications nodes each including a radio receiver for receiving data transmissions from said controller devices, a radio transmitter for transmitting polling signals to said controller devices, and a memory, and each of said data communications nodes is coupled to a plurality of controller devices via first communications links, and each of said communications nodes is coupled to said data management platform by a second communications link.

6. The system of claim 1, wherein the carrier frequency is within the VHF range.

7. The system of claim 1, wherein the carrier frequency is within the UHF range.

8. The system of claim 1, wherein the carrier frequency is within the 183.5 to 184.5 MHz band.

9. The system of claim 1, wherein the carrier frequency is within the 216 to 220 MHz band.

10. The system of claim 1, wherein the carrier frequency is about a frequency or paired frequencies selected from the group consisting of:

928/952 MHz, 956 MHz and 932/941 MHz.

11. The system of claim 1, wherein the radio transmitter in each collector device transmits in short bursts each of duration of no more than about 200 milliseconds.

12. The system of claim 1, wherein the radio transmitter in each collector device transmits in short bursts each of duration of no more than about 180 milliseconds.

13. The system of claim 1, wherein the radio transmitter in each collector device transmits in short bursts each of duration in the range of about 180 to 200 milliseconds.

14. The system of claim 1, wherein the power output of the radio transmitter in each collector device is about 10 milliwatts.

15. The system of claim 1, wherein each collector device is capable of transmitting an alarm signal up the system immediately upon detection of an alarm condition.

16. The system of claim 1, wherein a controller receives transmissions from about 5,000 collectors.

17. The system of claim 1, wherein the number of collectors exceeds 1,000,000.

18. The system of claim 1, additionally comprising a plurality of concentrator devices, each including a radio transmitter for communicating with said controller devices, a radio receiver for receiving data collector transmissions from said collector devices and a memory for storing data received from said collector devices.

19. The system of claim 18, wherein each concentrator is at a fixed non-mobile geographic location.

20. The system of claim 18, wherein each of said concentrator devices is capable of associating with each packet of data received from each collector additional data indicating the time and date of each data packet and the identity of the collector from which it was received.

21. The system of claim 18, wherein the data management platform computer is capable of directing the controllers to poll the concentrators at least one time within a determined period of time to ensure accurate data acquisition.

22. The system of claim 21, wherein the data management platform computer directs the controllers to poll the concentrators at least once within each 24-hour day.

23. The system of claim 20, wherein any of the concentrators, controllers and the data management computer are capable of identifying and discarding redundant data acquired for any determined period of time.

24. The system of claim 5, wherein each of said concentrator devices is capable of associating with each packet of data received from each collector additional data indicating the time and date of each packet and the identity of the collector from which it was received, and at least one among the concentrators, controllers, data communications nodes and the data management platform computer is capable of identifying and discarding redundant data acquired for any determined period of time.

25. The system of claim 5, wherein said communication links are via a system selected from the group consisting of telephone lines, T1 carriers, fiber optic networks, integrated systems digital networks, surface microwave links, satellite communications links, and meteor burst communications links.

26. The system of claim 18, wherein a concentrator device receives transmissions from about 5,000 collectors.