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'gps'
1997\12\09@143632 by ndie Ohtsji [4555]

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Hello,

I am interested in more information on GPS.  Does anyone have any good
links?

Questions:

       1) Has anyone interfaced a gps receiver with a pic before?
       2) Source of low-cost gps receivers?
       3) How accurate are they?
       4) How do you interpret the data and calculate your location?

Any information would be appreciated!

-Randie
                                   ________
  Randie Ohtsji                   / ____/ /__  ____  ____ ___  _________
  email: spam_OUTrohtsjiTakeThisOuTspamglenayre.com    / /___/ / _ \/ __ \/ __ `/ / / / __/ _ \
  Glenayre R & D                / /_\ / /  __/ / / / /_/ / /_/ / / /  __/
  Vancouver, B.C.  CANADA       \____/_/\___/_/ /_/\__,_/\__  /_/  \___/
  Phone: (604) 293-1611 x4555      ________________________/ /
  Fax:   (604) 293-4317           /_________________________/

1997\12\09@161132 by John Shreffler

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part 0 1025 bytes
-----Original Message-----
From:   Randie Ohtsji [4555] [SMTP:.....rohtsjiKILLspamspam@spam@GLENVAN.GLENAYRE.COM]
Sent:   Tuesday, December 09, 1997 2:34 PM
To:     PICLISTspamKILLspamMITVMA.MIT.EDU
Subject:        gps

Hello,

I am interested in more information on GPS.  Does anyone have any good
links?

Questions:

       1) Has anyone interfaced a gps receiver with a pic before?
       2) Source of low-cost gps receivers?
       3) How accurate are they?
       4) How do you interpret the data and calculate your location?

Any information would be appreciated!

-Randie
                                   ________
  Randie Ohtsji                   / ____/ /__  ____  ____ ___  _________
  email: .....rohtsjiKILLspamspam.....glenayre.com    / /___/ / _ \/ __ \/ __ `/ / / / __/ _ \
  Glenayre R & D                / /_\ / /  __/ / / / /_/ / /_/ / / /  __/
  Vancouver, B.C.  CANADA       \____/_/\___/_/ /_/\__,_/\__  /_/  \___/
  Phone: (604) 293-1611 x4555      ________________________/ /
  Fax:   (604) 293-4317           /_________________________/

1997\12\09@163055 by Jason Wolfson

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Randie,
I'm working on that now,
check out           http://www.leadtek.com.tw
for a good low cost GPS receiver that uses the SiRF Technologies chipset.
The output is a NEMA 0183, basically RS-232 at 4800 baud (5V too)

accuracy is 100m with out the differential antenna...

Cost is about $150 for 1 unit to around $85 for 10K units

location is by position from  a series of 24 satellites that orbit the
earth,
for more detailed info than that go to Amazon.com and order "Understanding
GPS
principles and applications" by Elliott D. Kaplan (recommended for engineers
only)
Hope this helps
Jason


{Original Message removed}

1997\12\09@163353 by Bob Shaver

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part 0 1148 bytes
Try:
http://www.trimble.com/       (Trimble is one of the big end-user and OEMs)
http://www.garmin.com/      (Garmin is also big into small GPS units <pun intended>).

----------
From:   Randie Ohtsji [4555]
Sent:   Tuesday, December 09, 1997 2:33 PM
To:     EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
Subject:        gps

Hello,

I am interested in more information on GPS.  Does anyone have any good
links?

Questions:

       1) Has anyone interfaced a gps receiver with a pic before?
       2) Source of low-cost gps receivers?
       3) How accurate are they?
       4) How do you interpret the data and calculate your location?

Any information would be appreciated!

-Randie
                                   ________
  Randie Ohtsji                   / ____/ /__  ____  ____ ___  _________
  email: rohtsjispamspam_OUTglenayre.com    / /___/ / _ \/ __ \/ __ `/ / / / __/ _ \
  Glenayre R & D                / /_\ / /  __/ / / / /_/ / /_/ / / /  __/
  Vancouver, B.C.  CANADA       \____/_/\___/_/ /_/\__,_/\__  /_/  \___/
  Phone: (604) 293-1611 x4555      ________________________/ /
  Fax:   (604) 293-4317           /_________________________/


1997\12\09@165217 by Sean Breheny

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At 11:33 AM 12/9/97 -0800, you wrote:
{Quote hidden}

Hi Randie,

Have a look at:

http://www.navcen.uscg.mil/gps/reports/sigspec/gpssps1.pdf

and

http://www.navcen.uscg.mil/gps/reports/sigspec/gpsspsa.pdf


These are the official GPS signal specifications from the U.S. Coast Guard.
I'm not sure if this is what you are looking for (i.e. it won't tell you
how to interface to a GPS receiver) but this has most if not all of the
technical specs needed to design a GPS receiver or to figure our the error
in a GPS reading due to certain circumstances.

Good Luck,

Sean



+--------------------------------+
| Sean Breheny                   |
| Amateur Radio Callsign: KA3YXM |
| Electrical Engineering Student |
+--------------------------------+
http://www.people.cornell.edu/pages/shb7
KILLspamshb7KILLspamspamcornell.edu

1997\12\09@172332 by johnb

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Randie Ohtsji [4555] wrote:
> Hello,
> I am interested in more information on GPS.  Does anyone have any good links?

Try:
http://www.inmet.com/~pwt/gps_gen.htm

This page gives a huge number of links. Look out for the pages that
describe "NMEA sentences" which explain the format of the RS232 data
that comes out of a GPS device. NMEA is "National Maritime Engineering
Association" and they have laid down the standards for decades; not just
GPS, but Loran, Decca, etc.

Newsgroup: sci.geo.satellite-nav gives extremely up-to-date info about
commercially available GPS devices and software (but not tonight, it
seems, because my newsfeed has gone down again). You can ask really
stupid questions and nobody minds. In fact they don't always notice.
Example (I read this recently): "Why don't marine GPS receivers give out
the altitude information sentences like the aircraft GPS receivers do?"
Answer: "Boats generally operate at sea level...."

Robin Lovelock's Home Page:
http://www.gpss.co.uk
Here, you can download huge amounts of his GPSS software, especially
maps of just about anywhere in the world. The system is meant for use in
vehicles - with the complete setup you talk to it and it answers
(obviously, you can't operate a keyboard and drive as well). For example
you say to it, "McDonalds", and it replies, "2 miles ahead, first
right".

Robin is a very kind man and you can ask him stupid questions, as I did.
His GPSS software suddenly stopped working for me. I had written a small
program, in Basic, on an old PC, that emulated a GPS receiver. It "flew"
from London to Edinburgh at any speed I set, and sent the data out the
RS232 at 4800 baud in NMEA sentence format, and into the RS232 on the PC
running the GPSS software. I can recommend this as a way of getting to
grips with NMEA data. You can keep clear of difficult maths by making
gross assumptions about the Latitude and Longitude of the source and
destination; find out how miles there are in a degree (Lat and Long) in
your part of the world, and then become a flat-earthist (for this
project only), and it's simple geometry.

The problem: it turned out Robin had at last correctly implemented the
checksum that follows an NMEA sentence (a simple little 1-byte thing, no
problem for a PIC). Some older GPS devices didn't bother with the
checksum, but GPSS ignores these sentences now. And quite right too,
since they might contain serious errors.

John Blackburn,
South London UK.

1997\12\10@105605 by rustyc

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Randie Ohtsji [4555] wrote:

>         2) Source of low-cost gps receivers?

Fry's electronics has the DeLorme GPS receiver for $150 (including
windozesoftware, if you're in to that ;-)  Unfortunately it does NOT use the
standard
protocol!

rusty

1997\12\10@124405 by Mcorio

picon face
In a message dated 97-12-09 16:42:28 EST, you write:

<<
I am interested in more information on GPS.  Does anyone have any good
links?
 >>

About a year ago, I looked at gps stuff. I found that Trimble has two nice
little books they are willing to give you that discuss GPS and Differential
GPS....great introductory stuff. Several companies had small recievers (small
is relative...not small enough for my application at the time) and the
cheapest solution I found was a chip set from Rockwell that was approx $50US,
if I remember correctly. After you get the signals received and coorellated,
you still need reasonable power to calculate position and do anything with it.
I do not think that the PIC is the right horse for this plow. If you want more
details, e-mail me privately and I will dig out my file and try to answer
specific questions, but these times are-a-changin' and you will likely find
more useful info via a search with your favorite www engine. If you find
anything very small (less than one inch square) or very cheap ($30 or less at
100K volume) please let me know, I may be able to dig up my old client and
convince them to re-open the project.

Mark A. Corio
Rochester MicroSystems, Inc.
200 Buell Road, Suite 9
Rochester, NY  14624
Tel: 716-328-5850
Fax: 716-328-1144
http://www.frontiernet.net/~rmi/
****** Designing Electronics for Research and Industry ******

1997\12\10@191934 by Eric Smith

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Rusty Carruth <RemoveMErustycTakeThisOuTspamINFICAD.COM> wrote:
> Fry's electronics has the DeLorme GPS receiver for $150 (including
> windozesoftware, if you're in to that ;-)  Unfortunately it does NOT use the
> standard protocol!

I've been told that it does use a standard protocol, but only after you've
sent it an initialization string or magic cookie of some sort.  I haven't
looked into it, but others have, so the info should be on the web somewhere.

Cheers,
Eric

1997\12\11@025517 by Tim Dawe

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Hi
We use GPS recievers in our data loggers....the 1Hz signal they
provide helps lock the loggers as it is more accurate
in the long term than a crystal (though not in the short term
cos of the jitter the military put in)

We paid NZ$300 (about$200US) for a Trimble reciever.

These recievers (and I guess most) also put out an rs232
signal every second of about 20 words, containing stuff like
the hour,minute,second,velocity,and position I think. Basically
your manual will give the details. This can be read by anything
that can read rs232.
The iHz pulse is ttl level, and I'm told the rising edge(but not the
falling) is accurate to 500nS

Hope this helps
Tim

On Tue, 9 Dec 1997, John Shreffler wrote:

> Try http://www.ashtech.com  You can get bare boards for $98
>
> {Original Message removed}


'GPS'
2000\03\20@132801 by jamesnewton
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This dude doesn't like his pages displayed outside of his frames. From his
homepage, select
schaltungen then computer then "GPS - Empfdnger Teil 1"

It requires a a hybrid integrated circuit MS1 from the American manufacturer
SiRF Technology
http://www.sirf.com/
which has a microcontroller and uses a receiver from Swiss company 5-BLOX
AG,  (smallest GPS in the world?)


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{Original Message removed}

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