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Demonstration of Adaptive Random Reporting Goes Data Collection System.

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New England Division has demonstrated a random reporting capability for collecting data using a standard 1500Hz channel on NOAAs GOES satellite. The new mode has several advantages over scheduled or interrogation modes used to collect hydrometeorologic data required in reservoir regulation in New England. In the random reporting system, hundreds of data collection platforms transmit on a single channel at proper random time intervals to insure an acceptable probability of reception. Several techniques have been incorporated to improve reception probabilities, the main ones being a short message less than 2 seconds and an adaptive algorithm programmed into each platform. This algorithm assures sufficient transmissions during critical times, yet relieves the system of superfluous messages during normal periods when no new or important information has been generated. The demonstration has confirmed that, even without the adaptive feature, at least 200 platforms will report successfully with 90 probability within an hour and the research has revealed future enhancements which could increase the number of platforms by an order of magnitude. A new platform designed around readily available components is now operable and is expected to bring costs within reach of many users. Author

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Final rept. 14 Mar 78-15 Jan 79,



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