I use my ProMark Xcm as my base.
Today, I did some GPSing for elevations. When I got back to the office and downloaded my base data(about 2-1/2 hours with about 1+ hour overlap), the data recorded as 1 session.
Upon downloading, Rinexing the data and putting it into A.S., I noticed that the data got "split" after about 1-3/4 hours. The remaining 3/4 hour listed as a kinematic session.
The ending of the "static" session and the beginning of the "kinematic" session were listed as the same time.
Can anyone give me any insite on this? I've had sessions stop before and i've had static sessions list out as kinematic, but I've never seen a session split into a "static" AND "kinematic", before.
The bipod fell over..
That is the only time this has happened to me.
Yours sounds different..If the unit was still standing.
Weird stuff just happens, but mostly we make the weird stuff happen.
Just my experience.
Deral
???? Descriptor
Posted By K. Rasnick on 12/14/2004 at 9:33 AM
The past two GPS project we have done with our promark 2' have been giving me the ole ???? and kinematic mode for our static sessions. It is on the same reciver each time. No biggie to fix it in Ashtech Solutions, Just curious if Ive got some kind of firmware bug.
I am using v.2.40
I have checked my unit and it is set to Static.
Thanks in advance
Re: ???? Descriptor
Posted By Mike Margolis_ on 12/14/2004 at 12:59 PM
I see this fairly frequently.
Last one, I had the customer send me the B file, at one point, he dropped to three satellites for almost a minute. The Antenna position was "moving" because of the poor solution, so the software kicked the observation into being kinematic.
I've had that happen, but in this case the GPS stayed on, the antenna is Concreted in with steel and fiberglass concrete.
AND . . . the first part of the session recorded, say from 16:30:30 to 17:15:15 and posted as Static. The second session began at 17:15:15 to 18:20:10 and lsted as kinematic.
odd indeed.
odd too, is that the file downloaded as a single file, went to rinex as a single file . . . then A.S. split it into 2 sessions.
Was the drop out at 11AM EST?
Few good satellites at that time. Only 5 for 1/2 hour. If PRN 11 went behind a tree in the SE sky you can forget about PDOP.
What does the S/N ration look like?
Paul in PA
Modified By Lawrence Paul Lopresti on 1/10/2005 at 9:48 PM
Actually LPL, the "occurance" took place at about noon+15 minutes.
Once I changed the "phantom" kinematic session back to static, the first "session" melded with the second "session".
It's just an oddity tha I've never seen before. I always thought, that in a single session, if A.S. thought the session was knematic, that it would change the ENTIRE session to kinematic.
S/N looks clean throughout(on the base).
Remember, the antenna is 16-1/2 feet high double layered in PVC(4" and 8") with steel pipe at full length, with a 12" diameter base to the first 48 inches, concreted into the ground(to about 3-1/4 to 4' deep with radial pipe through and below, and filled with fiberglass concrete on a 2' diameter base. I have absolutely open skies at about 10 degrees in all skies except the S.E.(partial blockage).
I gather data at 10 degrees and calculate it at 15 degrees.
Modified By John Francis on 1/10/2005 at 10:03 PM
John,
You didn't read my post.
The PDOP and/or NSats was so weak that even though the antenna was stationary, to the software the solution is so poor that it's location is jumping around epoch by epoch, so it appears that the antenna is moving, so the software deems the observation as kinematic.
In solutions it's easy to switch it back to static. If you're using MSTAR, I have no clue how to help you.
I DID read your post.
AS I SAID . . . I understand the idea that the GPS site is "floating" . . . I'm aware that the GPS sites always "float", and that sometimes they "float" so much that the PM2 assumes that a kinematic session is taking place.
What I said, was that I always thought that if at any time during a session that the GPS site "floated" too much, that A.S. would make the ENTIRE session kinematic.
If I run a session for 1 hour, and 1/2 way through I bump the setup, then place it back where it belongs . . . will I get a single session marked as kinematic, or will I get 1/2 session marked as static and 1/2 session marked as kinematic.
The rest of my post about my antenna was only part of my explaination to LPL that I had good sky view and that my noise to signal ratio was very good throughout the session. Maybe I should've stopped at simply stating that the antenna was 16-1/2 feet high and that I had a good S/N ratio?
What I said, was that I always thought that if at any time during a session that the GPS site "floated" too much, that A.S. would make the ENTIRE session kinematic.
Wrong. It'll split the session into a static and a kinematic. The split happens when the positions whack, and then everything after that is put into the kinematic session.
Modified By Mike Margolis_ on 1/10/2005 at 10:38 PM
Sorry Mike, I guess I didn't see that in your post.
I have had sessions in A.S. do as you did say about the ???? descriptor and the Kinematic indicator.
It's just that this particular situation is a first for me(the splitting of the session).
A blast from the past:
PM2 Download
Posted By Jimmy W on 10/26/2004 at 7:37 AM
PM2 auto static to Kinematic
Posted By tom c on 3/23/2004 at 10:38 AM
A first sergeant in Germany was famous for reminding us that, "Nothing is useless! It can always be used for an example."
We had a unit set up a base that burned all day and I got a real fragmented file, no solutions and just plain not enough data. I thought the cable must have been loose or something so we try again the next day.
Same result at lunch, ( I processed on the laptop) and this time it was a different unit than the day before. This thing was setup on hill with absoluteley clear horizons, I couldn't figure out how come we can't get data.
We ride back to that ppoint so i can look around and find the problem and as we are approaching the site we see a seagull sitting on the antenna! How funny!