I'm going to run some allnighters, using dual frequency receivers and not only process to the CORS, but send to OPUS..(also part of the ORGI ongoing project)
Has anyone already done some checks on this?
When I send a file to OPUS it returns the results in minutes...Takes me alot longer than this and wonder if 'hand processing' will produce better results than OPUS or worse?

TM

PS-Phil...If Ashtech would provide a loaner (along the software to download it), then I'd be glad to use the Big Blue...

These will be rinex files, so it really doesn't matter all that much..(but this is the Ashtech board)..
Modified By Trimble Man on 12/18/2001 at 6:25 AM

TM

since you're doing a comparison of standard dual frequency position based on processing with downloadable CORS files and dual frequency position as derived by OPUS, would you be interested in forwarding a rinex file of one of your all night sessions to the Stumpwater R&D O.R.G.I. Northeast Texas Divisional Office. The O.R.G.I. project would be very interested in doing a 100% L1 signal comparison to your dual frequency results.

To meet the current requirements of ORGI, session length must be 8 or more hours, preferably between 11:00 p.m. and 09:00 a.m local time.

ORGI is still testing positioning quality of L1 with long occupation times under the best possible solar conditions.

Besides, you can turn the tide in the "hide and seek" game and make me be "it".

J.D.


ps let me know what night and time span you plan and I'll screw a Locus on the POST

Modified By J.D. Billings on 12/18/2001 at 10:54 AM

J.D.,

It's your Locus, I guess you can do what you want with it. ;>()

Brian,

For the last year, I've screwed all 3 of my Locus units on the POST, as well as a couple of Promark 2 units. In every case they give up good coordinates. I've offered to let my buddies screw their Trimble units on the POST, but thus far have had no takers.

You think if I rephrase my request for loan of a dual frequency position of POST I'd get a better response?

j.d. baffled by the English language

J.D.
I'm going to email you with some information about how you may be able to temporarily get some dual freq gear in hand for your science projects.
Will send you something today.
-Bill Cottrell

I'll probably try sometime after Christmas..I'll keep you posted...

The precise ephemeris made quite a difference in the L1 as well as the L1/L2 solutions...so with that in mind, then I got to thinking (yes, I took some tylenol to quiet the pain) and wondered at what point does the precise come into play..With some 5 years of data (both our files and the precise ephemerides which contain varying lengths of baselines), then I intend to do a random sampling of precise verses broadcast processing...We should be able to determine the length at which it starts to reach critical mass (errors exceed those that can be compensated for)...
The Coast Guard maintains data back to 1994 (precises ep and ef files)...Could you use these and see what difference it makes in your processing also?

Maybe Mr. G, et al, already know this answer, but like a typical surveyor, I sorta need to find my own way (albeit a circuit in most cases)....

TM- Shadetree Geodesist