[FOSS-GPS] FOSS-GPS Digest, Vol 68, Issue 7

Thu Sep 18 05:18:09 PDT 2014

Thanks for the info Ambes.

Can you share which Tallysman antenna produced better results?  Are you
supplying external power for the antenna or using the 2.5V from the NV08C?

Do you have a suggestion for an L1+L2 base station for this purpose?  

Thanks,
-Sean

-----Original Message-----
From: foss-gps-bounces at lists.osgeo.org
[mailto:foss-gps-bounces at lists.osgeo.org] On Behalf Of Ambes Hagos
Sent: Thursday, September 18, 2014 3:56 AM
To: foss-gps at lists.osgeo.org
Subject: Re: [FOSS-GPS] FOSS-GPS Digest, Vol 68, Issue 7

Hi There,
I have a similar problem (L1 base station with NVS08C.
I tested with Toaglass and Tallysman antennas. The quality of antennas
really matter.
The tallysman I used (is also more expensive)  gave better results but not
as accurate as using GNSS base station.

My conclusion is you better look for L1 and L2 base station and better
antenna than your Toaglass.

regards
Ambes
________________________________________
Van: foss-gps-bounces at lists.osgeo.org <foss-gps-bounces at lists.osgeo.org>
namens foss-gps-request at lists.osgeo.org <foss-gps-request at lists.osgeo.org>
Verzonden: woensdag 17 september 2014 23:06
Aan: foss-gps at lists.osgeo.org
Onderwerp: FOSS-GPS Digest, Vol 68, Issue 7

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Today's Topics:

   1. Mobile Robot Experimentation (Sean Hyde)

----------------------------------------------------------------------

Message: 1
Date: Wed, 17 Sep 2014 17:05:35 -0400
From: "Sean Hyde" <sean.a.hyde at gmail.com>
To: <foss-gps at lists.osgeo.org>
Subject: [FOSS-GPS] Mobile Robot Experimentation
Message-ID: <0ddc01cfd2bb$20551d40$60ff57c0$@gmail.com>
Content-Type: text/plain; charset="us-ascii"

Hey Guys,

I've been playing around with RTKLib for a couple months now and have run
into some issues and I was wondering if anyone had any idea on how to
improve performance.

---Setup---

Base Station:

NVS08C on custom PCB using the receiver to power the antenna

Antenna is Taoglas Limited AA.161.301111
(http://www.taoglas.com/images/product_images/original_images/AA.161.301111.
pdf)

Antenna is on a 12" x 24" steel plate

Connected via FTDI->USB to Rasperry Pi

Raspberry Pi runs str2str to send the data to Windows laptop running rtknavi
using wifi backhaul

Rover:

NVS08C on custom PCB using the receiver to power the antenna

Antenna is Taoglas Limited AA.161.301111
(http://www.taoglas.com/images/product_images/original_images/AA.161.301111.
pdf)

Antenna is on a 18" x 18" steel plate

Connected via FTDI->USB to Rasperry Pi

Raspberry Pi runs str2str to send the data to Windows laptop running rtknavi
using wifi backhaul

The Rover setup is on a small mobile robot with a top speed of about 3mph.
It is in a city (Pittsburgh), but the sky is relatively unobstructed.

I'm running rtknavi in Kinematic mode using only GPS, L1+L2, 15deg elevation
mask.  The position that I input for the base station is a 5 hour average
(though it seems to have lost some precision when I pasted it?).  I have
tried both Continuous and Fix and Hold Integer Ambiguity Res.  I'll try to
attach screen shots of rtknavi.

Right now, it kind of works.  I can get relatively jitter-free floats and
occasionally fixes, but these fixes don't last long and I'm not sure they
are actually globally accurate (ie: if you restart the software, you may get
a fix, but it may be several meters from your last fix).  Sometimes a fix
goes away and never seems to come back.

I'm wondering if you guys have any suggestions to improve these results.

Better antennas? (Which ones?)

Trying to get better placement of the base station?

Different settings in rtknavi?

Continuous vs Fix and Hold?

Thanks!

-Sean

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