For you editing experts....What am I missing ??
Posted By James Webb on 1/21/2002 at 6:03 PM

Here's the scenario....

Project run as PK, 2 bases 1 rover, 2 - 5 min shots on each point 3+ hours apart. Processor V1.1 works OK. Solutions works almost OK. On 1 vector the Sv's go to N/A when the mask is up at 15°. At 10° just really bad numbers.

The Raw S/N graph shows 5 sats (both graphs) in the time frame 45-50 db , Elev 20-60 (both graphs), same SV numbers in both graphs and same Ref. SV in both raw graphs, BUT the residuals go blank. ?????????

Sucking heads on this one,
and wishing I was eating tails,

Jimbo




Modified By James Webb on 1/21/2002 at 6:04 PM

Re: For you editing experts....What am I missing ??
Posted By J.D. Billings on 1/21/2002 at 6:32 PM

Jimbo,

We haven't re-loaded 1.1/1.2 back to do PK since getting 2.xx so I can't follow you there now. I can tell you we gave up on 2.xx and attempting PK. When Shawn comes in tomorrow maybe he can remember what we experienced.

One thing I can guess from what you just said is you were attempting a tough project between 11:00 a.m. and 4:00 p.m. (plus or minus). Constellation really sucks for us during that time period. Had one point last week, semi moderate obstructions, I ran a Locus on for 2 hours. A great deal of the time only received 3-4 sv's.

You say you ran this in 1.1? What were the results there. Ver. 1.1 does look at the points as repeat vectors, right? Are you running with the rover continuously logging data and "tagging" the points with the data logger? I don't remember where we all left off with the PK experimentation.

J.D.







Re: For you editing experts....What am I missing ??
Posted By Richard Phelan on 1/21/2002 at 6:35 PM

Solutions is rejecting all satellites as bad on that particular vector, which leads to the residual plot being blank.

With SNR's at +45-50 DB, it doesn't sound like this site was heavily obstructed.

If you send me the raw data I'll look at it.

BR, Richard

Thales Navigation

Technical Support





Re: For you editing experts....What am I missing ??
Posted By James Webb on 1/21/2002 at 7:13 PM

Viryually no obstructions Richard.

If ya want it to play with I'd be happy to send it but I'm satisfied with what Proc. V1.1 produced. I knew Sol. 2.xx wasn't setup for PK.........

I just never ran into this before, where it seems like ya should get an answer,even a bad one, but ya don't.

All the others come in reasonable for 5 minute shots, continuously on, and riding inside the truck between shots...data logged with HP 48.

Thanks,

Jimbo

PS: I haven't compared SOL. vs PROC yet. That comes tomorrow.