Subject:
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RE: Mindstorm Robotwars style competition in Southern California/Los Angesles area?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 12 Jan 1999 21:12:36 GMT
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Original-From:
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rajackson@qnx/stopspammers/.com
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Viewed:
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3480 times
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Previously, you (Tim McSweeney) wrote:
> This raised an interesting thought in my head. Suppose you allow teams of
> robots to compete, Communication would be essential for both teams, so how
> would you filter out hostile messages from you own? The easiest way would
> be to force the teams to adhere to a standard, say 4bit id, 4 bits data per
> message, you could then ignore messages with the wrong id. It's more
> interesting if you allow a free for all.
>
> One thought was that you could usee say 4 bits hashcode, 4 bits data, The
> RCX will only accept the message if the hashcode is correct for the data
> according to some predefined (secret function)
>
> Another option would be to start with an initial code then the next code is
> defined by running the current code through some function. Messages are
> only accepted if the code matches the current one, when a message is
> accepted the code is advanced. This has problems with keeping multiple
> robots in sync of course.
>
> Are these essentially the same? what are some other options?
You could use spread spectrum. This is basicly where you transmit a
psudo-random noise signal and superimpose a data stream on top. This
is what most mil communication are now based upon. The only problem
is that the data rate is a fraction of the transmit rate. But it is
very unjammable and quite secure.
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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