[aprssig] ALOHA Circle Calculation
Bob Bruninga bruninga at usna.eduMon Aug 2 13:06:21 UTC 2010
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> ... [the ALOHA circle] is the circle that contians > a FULL [APRS channel]. > Thanks Bob... well, using Visual Basic 6.0, I... > calculate the distance from my station to each of > the stations heard [that] transmits a POSIT packet. > I can sort them in ascending order [of distance]... > ...I total them into Mobiles, Weather, Digi's and > Home stations... From there, the directions in > your algorithm get blurry... Ah, now the fun begins. You want to know how many packets each of those stations puts on the network per 30 minutes. So we assume 2 for a home station, 6 for WX, 3 per digi and so on (this is from memory so I may not have exact numbers here). Then we need to know how many copies each of those generates. So we start at own-station and go outward. Multiply each station's number by 1 until you get to the first digi. From then on, multiply each stations numbers by 2, and so on until the third digi, multiply by 3 and so on. Once this total number reaches 1800, (30 minutes of seconds), then the channel is 100% saturated. That range defines the aloha circle. > Now, when you say, "digi-copies" (variable of "c" > initialized to 1), do you mean to count any packet > that was digipeated as opposed to a packet > heard"direct" and then of course, increment "c" > accordingly? No, you increment C only when you get to another digi as you work outward in range down the list. Bob, WB4APR
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