I won't repeat the original 5 or 6 items listed in the original L1/CORS "mission plan" (which became the O.R.G.I. experiment), but would like some input on how you guy think Experiment #2 should work.

The idea here is to crank several L1 units in one fairly large "mega vector" session in conjunction with all CORS stations that will add the constraint network. We may have some units 30 miles or so apart, others may be 150 miles out. I guess that would depend on the number of participants, and maybe in how many units each participant may want to run. I may run 2 myself.

Not unlike "O.R.G.I. 1", the experimental points must be points of "local control caliber" established either from HARN points or CORS Network points. The known coordinates for preplanning can be map scale grade, but the higher precision coordinates will be used for post session comparison. Sessions 1,2 and 3 of original O.R.G.I. No. 1 all came in so close to my known local coordinates, I had to have better positioning done to verify all previous data.

We may not succede at getting NGS to consider establishment of an "OPIE" system for many reasons. Number 1 reason would be "anyone needing a high precision point out in the boonies should already have dual frequency equipment". My reason that "Number 1" reason is crap. Most of us out in the boonies are way out of normal L1 range of any CORS stations, and lack HARN points as well. The (us) guys in the boonies operate on a much smaller budget, in general, than those in the higher population areas (read higher control density)and are much less likely to have dual frequency equipment available. These are matters of simple economics that need not be discussed here. I can see the unpredictability and unreliability of L1 only positioning from the preliminary L1/CORS study. That's the reason I decided on the long night time sessions under predicted good space weather. I'd doubt NGS could come up with any guidelines for session planning that would maintain sufficient data quality. But, with the ability to use multiple L1/L2 CORS station data for ionospheric modeling, with proper system geometry, I still think iono and tropo problems can be reduced to near OPUS quality for a single L1 unit position.

The basic mission plan here is to show that we can build a co-op L1 network, tied to CORS, that could have some value to us guys in the outer reaches of NGS consideration.

More later....

J.D. Billings
Stumpwater R&D

p.s. Blue, yellow, red, green....I don't think the box color matters. We're not comparing equipment brands. That was never part of the experiment. Besides, you yellow guys may end up doing a lot of data processing since you have the ability to use the "precise" ephemerides.

I'm going to set up two receivers on HARN established (by us) NGS calibrated baselines....
We have permission to camp on the base for this session...(when is it?) Our baseline is out on Fort Sill...
Then not only will we have some baselines for region testing, then we'll also have some concrete 'ground to ground' comparison results from across the country...

This should be quite fun...

TM

The Arkansas Society of Professional Surveyors is going to set the Monument for the population center of Arkansas soon. It is less than 20 miles from our only University that has a Land Surveying Program. They may want to observe this point as part of OPIE with LOCUS. I will have one of my ancient LXII recievers runing on my version of the post. This could get interesting processing long sessions from 15 or 20 receivers. I would like to see how many receivers we can get going for 1 or more nights.

JD,

even if I don't have O.R.G.I.E. 2 up, I'll go for a weekend evening at the local HARN point. I might be able to set another up on a local control point in a secure area...coordinates unknown...Ok, known but only from "low class" monuments.

Depending on Space weather predictions, and I think you might be the O.R.G.I.E. expert on said weather predictions....when are we looking at ???

Jimbo

there's a HARN at the SE corner of my property, just across the highway...just let me know and i can fire a LOCUS up on her subito...which is Italian for reasonably soon, i think...heck, i have a nail in my front yard tied to the HARN, maybe i can fire one up on that too...it's also tied to a CORS...

L.K.

That's cool. Just so I can do some prelim, where are you? I'm in the process of tagging all the participants now. I suppose we'll have to keep it limited to the South central states. I'm figuring I can process data for Texas, Louisana, Oklahoma, Arkansas and get Tom Bryant from Mossouri in.

But, I can only speak for the ORGI Northeast Texas, Stumpwater Research And Development Facility. Our hopes are that the South Central Texas Facility of the OPIE Consortium, a.k.a. McMillan and Paulk (Indian Territory), will continue processing the data on the next dimension available.

My hope is for end of January or first of February. Space weather will be a consideration.

J.D.

After reading LK's post I think I'll add that to my house requirements if I ever move.....

"Must have HARN monument in Yard."

Jimbo

JD, I think LK's in Colorado...or Utah.... if memory serves correctly.

Jimbo

awaiting Utah licensure, about to move to Utah, currently living in SW Colo...the HARN is Chamberlain, PID=HM0575...about 130 east of my sorta NE property pin...bein's that my boundary runs NW parallel to the highway from that point, dontcha know...

i acknowledge that would be one hell of a long L1 baseline, but it could be interesting...now if there's anyone in Arizona, New Mexico or either of the two states i'm currently straddling...

let me know when you are going to do it and let's see what this puppy will do...

maybe a 16 hour observation or something...

note to self: add D cell batteries to shopping list...
Modified By L. K. Stevenson on 1/17/2002 at 6:55 PM

Someone in the Texas panhandle area might fit in there too. We may find a connecting line to Lawton, Indian Territory.

I wouldn't throw out any possibility.

J.D.

the best i figure, the distance between Chamberlain and your station Post is probably 1000-1200 miles...error for that range should be around 5-7 feet, dependent somewhat on the observation time, satellite geometry, etc., etc., etc...

i figure the worst we can do is get some lousy data...i don't think we will manage to blow up the equipment or anything...

it might be a good idea to keep data from such distant stations separate, really evaluating the data from grins and giggles and to see just how accurate this stuff can be...

we might surprise ourselves...

and if we have a beer every hour of observation time, we may not be too worried about stuff not fitting...

as i think about it, i can probably put another receiver at a HARN in Utah or one on the state line about 12 miles from here...if i get another tripod, i could put one at Chamberlain, one each at the airports in Blanding and Monticello...(AA3664 and AA3668, respectively)




Modified By L. K. Stevenson on 1/17/2002 at 8:51 PM