Direct IP with the Promark 3
Posted By Scott Taylor on 4/4/2008 at 9:50 PM

Hi there.
May name is Scott Taylor. I'm completing a Bachelor of Spatial Science - Surveying with the University of Southern Queensland.
This is my final year and I have to undertake a research project thesis.
I've decided to investigate the use of Direct IP with the promark 3.
I will look into the accuarcy,latency,reliability,efficiency etc using the PM3.
I was wondering if anyone else has perhaps tested the idea of Direct IP.
Direct IP is simply broadcasting differential corrections over the internet at a fixed IP address.
I plan to setup my laptop connected to the PM3 and to the internet. I plan to test different Direct IP freeware/shareware . Firstly I'll be using the program GPSD. Once the base is setup, you can connect your rover to the internet using a GPRS enabled phone and then dial in the IP address and port number of the base computer.
I will then test how far and accurate I can survey and will document this in a dissertation.
I was wondering if anyone has tested this concept as I am looking to find recent papers that I can compare results and information with?
I would also like to know if the PM3 can connect to a VRS? We don't have a VRS in Sydney although there is one in Queensland.
Finally, does anyone know of any useful documents which explain VRS and CORS and exactly how they work?How does a GPS connect to a VRS and CORS? Via mobile phone? radio?

All of my research information will be available after the completion of the project in November this year. I will also publish regular information on my website GLOBAL SURVEYORS www.globalsurveyors.com.au

Look forward to receiving your comments.
Thanks.
Modified By Scott Taylor on 4/4/2008 at 9:53 PM

Re: Direct IP with the Promark 3
Posted By Lawrence Paul Lopresti on 4/4/2008 at 9:57 PM

Interesting. As a comparison check also using the internal PM3 software to determine position. Using the PM 3 I believe you will actually be testing the efficacy of various computer softwares and not the receiver.

Can GPSD handle data from SBAS satellites?

Paul in PA


Re: Direct IP with the Promark 3
Posted By Scott Taylor on 4/4/2008 at 10:10 PM

Hi Paul. Thanks for the comment.

I'm not sure whether GPSD can handle data from SBAS?
I unfortunately don't own a PM3 however I have been generously loaned some gear for the project. I'm still a novice regarding all of its uses as well.
I however have begun doing some tests using a laptop with GPSD and I was able to get a fixed solution at the rover. As far as the accuracy of the data, I'm not sure as I didn't place the rover on a known location.
I will let you know my findings.





Modified By Scott Taylor on 4/4/2008 at 10:18 PM

Re: Direct IP with the Promark 3
Posted By Lawrence Paul Lopresti on 4/4/2008 at 10:59 PM

You do not need a known location to check precision, that is repeatability of position. If a system is repeatably precise then it's accuracy is based on the supporting system's accuracy.