[teqc] dropped obs

Mullins, Steven Steven.Mullins at dmme.virginia.gov
Tue Jul 26 14:36:08 MDT 2005


At first glance looks like an integer overflow.

http://igs.ifag.de/root_ftp/IGS/igsmail/IGSMESS.4967

See teqc log:

2004 Apr 16: eliminate_oversize_phase() has now been replaced with obs_phase_overflow() and occurs only before outputting RINEX or BINEX and after reading RINEX with the +reformat option (i.e. this is no longer done after reading the phases for the Ashtech formats), to eliminate phase overflow as now being seen in data from the Trimble NetRS when clock steering is enabled; a similiar function obs_other_overflow() checks for large sizes for other observables and occurs in the same places 

-----Original Message-----
From: teqc-bounces at ls.unavco.org [mailto:teqc-bounces at ls.unavco.org]On
Behalf Of Andrew Miner
Sent: Tuesday, July 26, 2005 4:18 PM
To: teqc support
Subject: [teqc] dropped obs


I'm rinexing some .dat files from a new survey-run site and suspect an
equipment failure in the first few days of its life.  At first I thought
the files might be getting corrupted during their ftp journey from a
microsoft to a linux system, but the onset is gradual with the first
obvious issues on day 161:

[minera at pc80237 ztemp]$ grep SUM *S
cpud1570.05S:SUM 05  6  6 17:00 05  6  6 23:59 6.999   5    n/a  45576 n/a
0.33  0.51   9115
cpud1580.05S:SUM 05  6  7 00:00 05  6  7 23:59 24.00   5    n/a 150981 n/a
0.33  0.53   8388
cpud1590.05S:SUM 05  6  8 00:00 05  6  8 23:59 24.00   5    n/a 150897 n/a
0.34  0.53   7942
cpud1600.05S:SUM 05  6  9 00:00 05  6  9 23:59 24.00   5    n/a 148131 n/a
0.33  0.52   8230
cpud1610.05S:SUM 05  6 10 00:00 05  6 10 23:48 23.80   5    n/a  93327 n/a
0.36  0.57   5185
cpud1620.05S:SUM 05  6 11 00:00 05  6 11 23:59 24.00   5    n/a   6855 n/a
0.49  0.64   1143
cpud1630.05S:SUM 05  6 12 00:00 05  6 12 23:59 24.00   5    n/a      0 n/a
0.00  0.00      0
cpud1640.05S:SUM 05  6 13 00:00 05  6 13 23:59 24.00   5    n/a      0 n/a
0.00  0.00      0

Since then attempts to rinex have yielded nothing but this sort of thing:

2005 Jul 24 03:02:40.000: G29 observable L2 -1556624160.944 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G27 observable L1 -1987992792.218 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G27 observable L2 -1549053721.694 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G 8 observable L1 -2000428686.387 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G 8 observable L2 -1559239383.101 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G19 observable L1 -1978730228.236 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G19 observable L2 -1541853249.681 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G28 observable L1 -2003070863.502 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G28 observable L2 -1560816080.592 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G26 observable L1 -1995101253.779 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G26 observable L2 -1554896026.827 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G 7 observable L1 -1996321940.941 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G 7 observable L2 -1555558291.738 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G11 observable L1 -1989895033.188 being
eliminated from stdout
2005 Jul 24 03:02:40.000: G11 observable L2 -1550556972.529 being
eliminated from stdout

etc, etc...

I've put the files at ftp://ftp.panga.cwu.edu/private/cpud_problem if any
one is interested in taking a look.

------------------
Andrew Miner
PANGA Data Center
509-304-4096 (cell)
509-963-1109 (fax)
------------------

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