Date: Wed, 8 Oct 1997 08:33:17 -0600 (MDT) From: Nate Williams <nate@mt.sri.com> To: Mike Smith <mike@smith.net.au> Cc: Nate Williams <nate@mt.sri.com>, cliff ainsworth III <cliff@cliffsworld.com>, freebsd-hardware@freebsd.org Subject: Re: project truck.....ideas wanted Message-ID: <199710081433.IAA10497@rocky.mt.sri.com> In-Reply-To: <199710080501.OAA00853@word.smith.net.au> References: <199710061833.MAA01027@rocky.mt.sri.com> <199710080501.OAA00853@word.smith.net.au>
next in thread | previous in thread | raw e-mail | index | archive | help
> > > GPS might be useful depending on the length of the run; I suspect that > > > its basic accuracy won't be good enough to give you useful figures. > > > > Actually, GPS is *very* accurate. If you really want to do GPS, setup a > > stationary unit, and use the data collected from it. You can get better > > than 1-meter accuracy that way (differential GPS.) > > Damn, I forgot DGPS. You will want a decent wireless radio link > between the truck and your base station to run the DGPS data (from > memory the Rockwell modules want 9600 bps) over. A relatively cheap > shorthaul wireless modem set should give you enough to run PPP over. > You could use this for realtime telemetry. 8) You don't even *need* a wireless radio link, since the GPS unit will allow you to synchronize your clocks with the satellites, thus allowing you the ability to use time-stamps for your readings that you can 'differentialize' after the run. > > > Watch out for fifth-wheel speed recorders; they have a tendancy to > > > disintegrate under severe conditions. > > > > Not only that, they tend to slow you down. :) > > This is when they're working, or after they've become small rototillers > dragging clumps of the roadway behind you? Both, although the latter tends to provide much more friction, but for a shorter period of time until it disintigrates! *grin* Nate
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199710081433.IAA10497>