[teqc] "Possible obs > 0.0 deg" is decreasing?

Lou Estey lou at unavco.org
Thu Apr 8 07:32:03 MDT 2010


> My GPS receiver is working at "Observation interval : 1.0000 seconds"
> but the "Possible obs > 0.0 deg" is decreasing,and the raw data size is also
> decreasing, why?The raw data size jpg is accessories.
>
> *************
> Time of start of window : 2010 Mar 1 00:00:00.000
> Time of end of window : 2010 Mar 1 23:59:59.000
> Time line window length : 24.00 hour(s), ticked every 3.0 hour(s)
> |qc - header| position : 34 m
> Observation interval : 1.0000 seconds
> Total satellites w/ obs : 32
> NAVSTAR GPS SVs w/o OBS :
> NAVSTAR GPS SVs w/o NAV :
> Rx tracking capability : 12 SVs
> Poss. # of obs epochs : 86400
> Epochs w/ observations : 86400
> Epochs repeated : 0 (0.00%)
> Possible obs > 0.0 deg: 980912
> ---------------------
> Time of start of window : 2010 Mar 2 00:00:00.000
> Time of end of window : 2010 Mar 2 23:59:59.000
> Time line window length : 24.00 hour(s), ticked every 3.0 hour(s)
> |qc - header| position : 32 m
> Observation interval : 1.0000 seconds
> Total satellites w/ obs : 31
> NAVSTAR GPS SVs w/o OBS : 25
> NAVSTAR GPS SVs w/o NAV :
> Rx tracking capability : 12 SVs
> Poss. # of obs epochs : 86400
> Epochs w/ observations : 86400
> Epochs repeated : 0 (0.00%)
> Possible obs > 0.0 deg: 946938
> --------------------------
> Time of start of window : 2010 Mar 23 00:00:00.000
> Time of end of window : 2010 Mar 23 23:59:59.000
> Time line window length : 24.00 hour(s), ticked every 3.0 hour(s)
> |qc - header| position : 28 m
> Observation interval : 1.0000 seconds
> Total satellites w/ obs : 31
> NAVSTAR GPS SVs w/o OBS : 25
> NAVSTAR GPS SVs w/o NAV : 1
> Rx tracking capability : 12 SVs
> Poss. # of obs epochs : 86400
> Epochs w/ observations : 86400
> Epochs repeated : 0 (0.00%)
> Possible obs > 0.0 deg: 915266
> ---------------------------------
> Time of start of window : 2010 Mar 24 00:00:00.000
> Time of end of window : 2010 Mar 24 23:59:59.000
> Time line window length : 24.00 hour(s), ticked every 3.0 hour(s)
> |qc - header| position : 32 m
> Observation interval : 1.0000 seconds
> Total satellites w/ obs : 31
> NAVSTAR GPS SVs w/o OBS : 25
> NAVSTAR GPS SVs w/o NAV : 1
> Rx tracking capability : 12 SVs
> Poss. # of obs epochs : 86400
> Epochs w/ observations : 86400
> Epochs repeated : 0 (0.00%)
> Possible obs > 0.0 deg: 915316

Most likely because the visible GPS constellation is changing day by day.
(Assuming you have all the appropriate GPS nav messages in the input file(s)
to do the qc.)

cheers,
--lou

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
Boulder, CO  80301-5554            e-mail:  lou  unavco.org
    WWW:  http://www.unavco.org   http://jules.unavco.org

"If the universe is the answer, what is the question?"
                                                -- Leon Lederman
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