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[DPRG] Long Haul Way Points

Subject: [DPRG] Long Haul Way Points
From: -Old Dog- puppy_dog500 at yahoo.com
Date: Mon Sep 11 19:33:02 CDT 2006

Kip:

I can't remember if you were at the meeting saturday
when we did the walk-through. Do you need me to join
you guys to confirm the points?

-Martin

--- Kipton Moravec <kip at kdream.com> wrote:

> How does Friday morning at the Science Place in Fair
> Park sound? Say
> 9:00 a.m.?
> 
> Kip
> 
> On Mon, 2006-09-11 at 16:18 -0500, John Harrison
> wrote:
> > I can meet anytime on Thursday, or Friday morning.
> > 
> > John
> > 
> > -----Original Message-----
> > From: dprglist-bounces at dprg.org
> [mailto:dprglist-bounces at dprg.org] On Behalf
> > Of Kipton Moravec (SPEC Manufacturing)
> > Sent: Monday, September 11, 2006 4:15 PM
> > To: John Harrison
> > Cc: dprglist
> > Subject: RE: [DPRG] Long Haul Way Points
> > 
> > When do you want to go down there?  I want to see
> how my GPS board compares
> > to yours.
> > 
> > Kip
> > 
> > > -----Original Message-----
> > > From: John Harrison
> [mailto:johnh630 at comcast.net]
> > > Sent: Monday, September 11, 2006 3:52 PM
> > > To: kip.moravec at specmanufacturing.com
> > > Cc: 'dprglist'
> > > Subject: RE: [DPRG] Long Haul Way Points
> > >
> > >
> > > Yes, I have an old one available that we could
> take some measurements.
> > >
> > > John
> > >
> > > -----Original Message-----
> > > From: Kipton Moravec (SPEC Manufacturing)
> > > [mailto:kip.moravec at specmanufacturing.com]
> > > Sent: Monday, September 11, 2006 3:38 PM
> > > To: John Harrison
> > > Cc: dprglist
> > > Subject: RE: [DPRG] Long Haul Way Points
> > >
> > > So does that mean you are volunteering to bring
> one of your units to Fair
> > > Park and take measurements we can use for the
> robot competition?
> > >
> > > Kip
> > >
> > > > -----Original Message-----
> > > > From: dprglist-bounces at dprg.org
> [mailto:dprglist-bounces at dprg.org]On
> > > > Behalf Of John Harrison
> > > > Sent: Monday, September 11, 2006 9:58 AM
> > > > To: '-Old Dog-'; 'David P. Anderson';
> dprglist at dprg.org
> > > > Subject: RE: [DPRG] Long Haul Way Points
> > > >
> > > >
> > > > Hello DPRG list.
> > > >
> > > > I have just found your organization on the net
> and joined (have
> > > > not been to
> > > > a meeting yet).  I am coming into this mail
> thread in the
> > > middle of it so
> > > > this may be a little out of context, but my
> company designs and
> > > sells GPS
> > > > auto steering systems for agriculture and road
> construction.  I am the
> > > > designer and have had systems in the field for
> the last 5 years.  I have
> > > > tried about every GPS imaginable.  The golden
> rule of accuracy and
> > > > repeatability is "you get what you pay for".
> > > >
> > > > Our customers require, at a minimum, 4 inch
> short duration
> > > > repeatability and
> > > > 12 inch long duration repeatability.  This is
> impossible to get from any
> > > > sports receiver.  Base band GPS is only
> accurate to about 30 - 60 feet
> > > > (depending on single or dual channel).  Our
> experience with WAAS
> > > > is that it
> > > > is better than the publicized specs, but has
> had some
> > > reliability problems
> > > > lately.  We have been seeing approx 24 inches
> of long duration
> > > > repeatability
> > > > from WAAS.  The best repeatability, by far, is
> from the purchased
> > > > correction
> > > > services.  Our products have completely gone
> with the purchased services
> > > > even though the receivers are over $5500 (at
> the low end).  The
> > > published
> > > > specs on these receivers are 12 inch long
> duration repeatability, but we
> > > > have been seeing closer to 6 inch.  All of
> these specs are
> > > statistical so
> > > > repeatability is a little bit relative to you
> level of pain.
> > > >
> > > > If you want centimeter accuracy you can go
> with a dual channel
> > > RTK system
> > > > with a base station, but you are talking about
> big $$$$ (price is coming
> > > > down).  If any of you are interested, I would
> love to design an
> > > > RTK system.
> > > > The price for purchased systems are totally
> inflated relative to
> > > > the actual
> > > > hardware needed.
> > > >
> > > > I hope that this may have helped.
> > > >
> > > > New Member
> > > > John H. Harrison Jr
> > > > Harrison Ag Technologies
> > > > Johnh630 at comcast.net
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: dprglist-bounces at dprg.org
> > > > [mailto:dprglist-bounces at dprg.org] On Behalf
> > > > Of -Old Dog-
> > > > Sent: Sunday, September 10, 2006 1:31 PM
> > > > To: David P. Anderson; dprglist at dprg.org
> > > > Subject: Re: [DPRG] Long Haul Way Points
> > > >
> > > > All:
> > > >
> > > > The differences in GPS coordinates don't come
> as any
> > > > surprise to me. That's why I also described
> the course
> > > > in terms of headings, distance, and pictures.
> After
> > > > yesterday's meeting two potential competitors
> walked
> > > > the course with their GPS's, and noted
> discrepancies
> > > > between their readings. If they'd like to
> share their
> > > > results, I'd be interested in comparing them
> to what
> > > > I've already calculated. The maximum
> difference
> > > > between what yours and my readings are about
> 2/1000.
> > > > That doesn't sound like much; until you
> realize how
> > > > much distance a single degree covers.
> > > >
> > > > What does surprise me is not being able to get
> a lock
> > > > at some key way points. When mapping the
> course, I
> > > > made sure I could get at least 5 satellite's
> per mark.
> > > > But I wanted this to be a contest of
> ingenuity, rather
> > > > than who has the best equipment. In that
> spirit, Eric
> > > > offered an interesting suggestion yesterday,
> when
> > > > another GPS had the results you mentioned:
> Activate
> > > > your robot far enough away from the building
> to get a
> > > > satellite lock prior to the start of the
> attempt. Then
> > > > direct the robot to the starting area, and use
> > > > odometry to compensate. There is nothing in
> the rules
> > > > about taking that approach.
> > > >
> > > > > For those who might like to try another
> challenge
> > > > while we are at FiarPark,
> > > > > here are the 2 waypoints to go from the
> meadow next
> > > > to the Science Place
> > > > > to the meadow next to Texas Star Ferris
> wheel, 
=== message truncated ===


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