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Subject: Re: vechile speed meter
Organization: Chariot Internet - http://www.chariot.net.au
Date: Wed, 13 Nov 2002 09:25:59 +1030
NNTP-Posting-Date: Wed, 13 Nov 2002 09:52:41 EST
The general solution to your problem is probably GPS. Although they
probably exist, I haven't found a GPS that outputs at more than 1
psoition/second. This is too slow for your use. Inertial systems using
magnetic sensors/accelerometers drift too much over comparatively short
time periods. A combination of the two using a kahlman filter is
probably the optimum solution. I am currently developing such a beast.
11 inertial sensors, GPS, local DGPS, temp sensor and humidity sensor
(used to offset both the inertial sensors and to improve the weather
model used by the GPS), micros, 16Mb storage and RF transceiver. Whole
thing packs into a 30mm cube, including RF and GPS antennas.
> Thanks to all for fast reply.
> I didn't mean to make a unit without sensor; just if is possible without
> outside sensor. I was think about some kind of acceleration sensor or
> something similar.
> I need to develop a test unit for different types of vehicle. It will be
> used in test purpose to measure how many times we go over speed limit inside
> some protected areas. For instance, inside a school area where speed limit
> is below 40 km/h. Idea was to made speed logger, which can be connected to
> PC after a one or two hour. Counter will add value just in case if you drive
> over speed limit for at list 10 seconds. If you go over 40 km/h unit will
> start beep signal to warning you.
> Best regards,
> izbrisi SPAM1 u e-mail adresi
> remove SPAM1 from address
> "James Meyer" wrote in message
> > On Mon, 11 Nov 2002 01:27:15 +0100, "abacus-ri"
> > wroth:
> > >Hi to all,
> > >
> > >I need to develop vehicle speed meter with trip computer.Does anybody
> > >some idea how to measure a speed without outside sensor.
> > >
> > >Thanks in advanced
> > >Damir
> > A GPS receiver would work. Unless the vehicle is a small robot meant to
> > navigate inside sewer pipes. What sort of vehicle do you have in mind?
> > Jim
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