[teqc] helpful tip of week 2022

Lou Estey lou at unavco.org
Wed Oct 10 06:57:51 MDT 2018


This week's tip: qc full: the '-dn' and '+dn' ASCII time plot lines, part II

Last week you were exposed to the utility of the '-dn' and '+dn' discrepancy lines
for a single dataset, say, a single day's worth of data.  However, looking at these
discrepancy lines over many days can give clues about other problems.  This week shows
an example for site P319, a GNSS station located in northwest California, looking at
a problem that was well developed by late December 2013 into late-January 2014.  P319 was
(and still is) solely powered by solar panels and batteries. (You can find the qc reports
from which the following is taken at ftp://data-out.unavco.org/pub/rinex/qc/2013
and ftp://data-out.unavco.org/pub/rinex/qc/2014 -- go the the appropriate day-of-year
and look for the report for p319.)

Perhaps many of you use the quantities in the qc SUM line as your primary qc metrics.
The following is what you would have seen (and will see in the aforementioned links)
from 21 Dec 2013 to 29 Jan 2014 as the SUM lines for P319:

SUM 13 12 21 00:00 13 12 21 23:59 23.80  15  49894  48745  98  0.38  0.34   1741
SUM 13 12 22 00:00 13 12 22 23:59 23.14  15  49878  47529  95  0.37  0.32   1188
SUM 13 12 23 00:00 13 12 23 23:59 22.53  15  49892  46588  93  0.38  0.32   1412
SUM 13 12 24 00:00 13 12 24 23:59 23.05  15  49896  47614  95  0.38  0.35    756
SUM 13 12 25 00:00 13 12 25 23:59 23.42  15  49893  48016  96  0.38  0.33    640
SUM 13 12 26 00:00 13 12 26 23:59 22.88  15  49898  47226  95  0.38  0.34   1181
SUM 13 12 27 00:00 13 12 27 23:59 23.07  15  49911  47637  95  0.38  0.33   1985
SUM 13 12 28 00:00 13 12 28 23:59 23.91  15  49919  49056  98  0.38  0.33   2725
SUM 13 12 29 00:00 13 12 29 23:59 21.49  15  49905  45064  90  0.38  0.32   1325
SUM 13 12 30 00:00 13 12 30 23:59 21.18  15  49897  43771  88  0.38  0.33   2084
SUM 13 12 31 00:00 13 12 31 23:59 23.97  15  49901  49092  98  0.38  0.34   1818
SUM 14  1  1 00:00 14  1  1 23:59 20.07  15  49898  41721  84  0.38  0.33   2781
SUM 14  1  2 00:00 14  1  2 23:59 9.083  15  40760  18088  44  0.38  0.32    312
SUM 14  1  3 00:00 14  1  3 23:59 20.39  15  49898  40042  80  0.38  0.33    636
SUM 14  1  4 00:00 14  1  4 23:59 23.80  15  49896  48870  98  0.38  0.33   3759
SUM 14  1  5 00:00 14  1  5 23:59 23.83  15  49894  48904  98  0.38  0.33   2877
SUM 14  1  6 00:00 14  1  6 23:59 24.00  15  49899  49158  99  0.38  0.34   1170
SUM 14  1  7 00:00 14  1  7 23:59 23.96  15  49894  49121  98  0.38  0.34   4466
SUM 14  1  8 00:00 14  1  8 23:59 21.55  15  49874  44544  89  0.38  0.32   4454
SUM 14  1  9 00:00 14  1  9 23:59 24.00  15  49881  49132  98  0.37  0.33   6142
SUM 14  1 10 00:00 14  1 10 23:59 24.00  15  49870  48481  97  0.38  0.33   8080
SUM 14  1 11 00:00 14  1 11 22:36 9.367  15  43287  20927  48  0.37  0.34    675
SUM 14  1 12 07:37 14  1 12 23:59 16.37  15  32300  31842  99  0.36  0.32   5307
SUM 14  1 13 00:00 14  1 13 23:00 22.90  15  48366  47372  98  0.37  0.34   1974
SUM 14  1 14 00:51 14  1 14 23:59 20.86  15  48489  42935  89  0.38  0.32   1590
SUM 14  1 15 00:00 14  1 15 23:59 19.92  15  49890  39335  79  0.38  0.33    959
SUM 14  1 16 00:00 14  1 16 23:59 23.83  15  49893  48858  98  0.38  0.32   4442
SUM 14  1 17 00:00 14  1 17 23:59 23.92  15  49894  48993  98  0.38  0.32   1884
SUM 14  1 18 00:00 14  1 18 23:59 23.32  15  49890  47409  95  0.38  0.34    697
SUM 14  1 19 00:00 14  1 19 23:59 9.858  15  49893  20457  41  0.39  0.33    227
SUM 14  1 20 00:00 14  1 20 23:59 9.704  15  43797  20122  46  0.38  0.32    314
SUM 14  1 21 00:00 14  1 21 23:59 12.00  15  47011  25210  54  0.39  0.32    355
SUM 14  1 22 00:00 14  1 22 23:59 10.10  15  45579  20863  46  0.39  0.33    294
SUM 14  1 23 00:00 14  1 23 23:59 12.54  15  47024  27059  58  0.39  0.32    288
SUM 14  1 24 00:00 14  1 24 23:59 20.34  15  49887  42552  85  0.38  0.33   1150
SUM 14  1 25 00:00 14  1 25 23:59 23.18  15  49891  47253  95  0.39  0.33    531
SUM 14  1 26 00:00 14  1 26 23:59 17.23  15  49892  35813  72  0.39  0.34    431
SUM 14  1 27 00:00 14  1 27 21:38 9.583  15  43230  21849  51  0.39  0.32    341
SUM 14  1 28 18:37 14  1 28 23:59 5.379  15   9990   9792  98  0.38  0.31   9792
SUM 14  1 29 00:00 14  1 29 21:43 1.375  15  19696   2322  12  0.39  0.34    464

 From these, try to diagnose the problem at P319.  You can see that there is an intermittent
drop both in observations and in the percentage of complete observations as time progresses.
Also, there's an intermittent decrease in the total span of data collected during the day.
But for what data was collected, the multipath rms is more or less constant over time.
(The field engineer's diagnosis was that the loss of data was possibly due to a bad
connection between the chokering antenna and the receiver -- possibly degrading over time.)

Ok, now let's look at the '+dn' lines for the same days, where the time span for
most are 24 hours, 00:00:00 - 23:59:45 GPS time (or roughly 4 pm PST local time at
the day rollover at each end):

+dn|12111121121221  111 11  1    1  1    11    1    11   1     1   11111e12e|+dn <- 21 Dec 2013
+dn|1eee112112122   1212 1  1   1   1    11    1    11   1     1   1111ee121|+dn
+dn|1e11eeeee2122  11212    1   1   1    1          11   1     1   1111ee221|+dn
+dn|12ee1ee112222  122 2 1 1    1   1    1    1     1    1     1   111e11221|+dn
+dn|eee11e1112221  121 21  1    1  11    1         11    1    1    1111ee221|+dn
+dn|eee1121eee22   121 21  1   11  1    11    1    11   1     1   1111111211|+dn
+dn|21e11eee2122   1212 1  1   1   1    11    1    11   1     1   1111111211|+dn
+dn|211112112122  11111 1  1   1   1    1    1     1    1     1   111111ee1e|+dn
+dn|2eeeeeeeeee2  112 2 1 1    1   1    1    1     1    1    11   1111112212|+dn
+dn|1eee211eeeeeee121 211 1    1  11    1    1    11    1    1    1111112212|+dn
+dn|11112112122   111 11  1   11  1    11         11   1     1   1111e112112|+dn
+dn|eeeeeeeeeeeeee1212 1  1   1   1    11    1    11   1     1   11111112112|+dn <-  1 Jan 2014
+dn|1ee12eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee1         1111e122112|+dn
+dn|11ee2112eeeeeeeeeee1 1    1   1    1          1    1    11   1111eee2121|+dn
+dn|1ee2111222   121 2   1    1  11    1    1    11    1         11111122121|+dn
+dn|1ee2112122   121121  1   11  1    11    1    11   1     1   111111121121|+dn
+dn|1112111222   1111 1  1   1   1    11    1    1    1     1   111111221121|+dn
+dn|1112112112  11111 1 1    1   1    1    1     1    1     1   1111112e1121|+dn
+dn|111eeeeeeee 112 211 1    1   1    1    11    1    1     1   111111221211|+dn
+dn|112112222   121 11  1    1  11    1     1   11    1    1    111111211211|+dn
+dn|112112122  11111121121  11  1    11    1    11   1     1   1111111211211|+dn
+dn|11211eeee e 11212 eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee1    111111221|+dn <- 11 Jan 2014
+dn|5 1    11      11  1   11     111     11       1     1111111112211121111|+dn
+dn|112112122   111 11  1    1   1    11    1    11    1     11  111111122ee|+dn
+dn|eeeeeeeee121 21  1    1   1    1     1    11    1     1   11111112112ee1|+dn
+dn|1ee1eeeeeeeeeeee1  1   11  1    11    1    11   1     1   11111112ee2111|+dn
+dn|12112122   1212    1   1   1    1     1    11   1     1   11111122e12111|+dn
+dn|12112122  11212 1 1    1   1    1    11   11    1         111111ee122111|+dn
+dn|1211222   eee 211 1    1   1    1    11    1    1    1    111111ee12e111|+dn
+dn|2eeeeeee  eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee  1    111111eeeee111|+dn
+dn|211eee1   eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee  1   1111111eee2e111|+dn <- 20 Jan 2014
+dn|211eee1   1eeeeeeeeee 1  eeeeeeeeeeeeeeeeeeeeeeeeee  1   111111e2ee2e111|+dn
+dn|e112ee1  1eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee  1   111111e2eee1111|+dn
+dn|21eeeee  112 eeee    eeeeeeeeeeeeeeeeeeeeeeeeeeeeee 1    111eeee2ee11112|+dn
+dn|111eeeee 121 21  1   11 eeeeeeee    11   11   11    1    11111121e211112|+dn
+dn|111122ee 1e1211  1   1   1    11    1    11   1     1   1111ee22ee211112|+dn
+dn|eeeeeeeeeee12 eeee   1   1 eeeeeeeeeeeeee1    1     1   111111221e211112|+dn
+dn|e1ee11 ee11ee211  1eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee1    1111111221|+dn
+dn| 11 1111111111111111111111112222211111111111211 111111111111111111211111|+dn
+dn|11eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee1|+dn  <- 29 Jan 2014

Rather than a connector problem, to our group the '+dn' lines were suggesting a
power issue.  Exactly what that power issue might be was hard to tell, but the
'+dn' lines were clearly showing that during the nighttime hours (left-shifted of
center for most of the '+dn' lines) there was a growing intermittent loss of all
data (i.e. the 'e' symbols), but there was pretty good data during daylight hours.

Upon getting to P319 on 30 Jan 2014 (during daylight hours), the field engineer
determined that the connection from the antenna to the receiver was fine, but that
the power charge controller was failing.  Basically, for most days, the receiver
was only being powered during daylight hours from the solar panels, with little
to no uptime during nighttime hours because the power controller was not properly
charging the batteries during the day, so the batteries had too a low charge for
powering the receiver during the night.  (Hence the intermittent decrease in observables,
etc.)  Replacing the charge controller solved the power problem, thus allowing the
receiver to function within its correct voltage levels both day and night.  Then,
in the days immediately after the repair, the '+dn' lines returned to a more normal
pattern (for this site) of:

+dn|12121   1212 1 11   1   1    1     1    1    1     1   11111122112111121|+dn <- 31 Jan 2014
+dn|12111  11111 1 1    1   1    1    1    11    1    1    11111122121111221|+dn
+dn|1111   112 2 1 1    1  11    1    1    11    1         11111122121111211|+dn
+dn|1111   121 2   1   11  1    11    1    11   11    1    11221121221111211|+dn
+dn|2111   1111 1  1   1   1    11    1    1    1         111111221121111211|+dn <-  4 Feb 2014

This case for P319 is just one (well-documented) tale out of many where we've been
able to use the '+dn' lines over time to help understand what was happening at a
permanent GNSS station.  (One can also use the '-dn' lines, but these often have
a number of '+' symbols for modern receivers, and remember that the '-dn' lines are
showing the good news whereas the '+dn' lines are showing the bad news.)

Happy teqc-ing!

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

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

Past helpful tips:

week 1894: using teqc config files - https://postal.unavco.org/pipermail/teqc/2016/002067.html
week 1895: qc of high-rate data - https://postal.unavco.org/pipermail/teqc/2016/002071.html
week 1896: UNIX/Linux shells for Windows - https://postal.unavco.org/pipermail/teqc/2016/002072.html
week 1897: '-' vs. '+' teqc options - https://postal.unavco.org/pipermail/teqc/2016/002076.html
week 1898: auto-identification of formats - https://postal.unavco.org/pipermail/teqc/2016/002092.html
week 1899: auto-identification vs. format flags - https://postal.unavco.org/pipermail/teqc/2016/002096.html
week 1900: square brackets in options - https://postal.unavco.org/pipermail/teqc/2016/002105.html
week 1901: using option '+mds' - https://postal.unavco.org/pipermail/teqc/2016/002108.html
week 1902: qc results w/ problematic nav messages - https://postal.unavco.org/pipermail/teqc/2016/002113.html
week 1903: '-no_orb[it]' and '-no_pos[ition]' options - https://postal.unavco.org/pipermail/teqc/2016/002115.html
week 1904: '-week' option - https://postal.unavco.org/pipermail/teqc/2016/002117.html
week 1905: using '+bcf' for XYZ/geodetic conversion - https://postal.unavco.org/pipermail/teqc/2016/002126.html
week 1906: the '+v[erify]' option - https://postal.unavco.org/pipermail/teqc/2016/002128.html
week 1907: '+C2', '+L5', "+L6', '+L7', '+L8', '+all' options - https://postal.unavco.org/pipermail/teqc/2016/002130.html
week 1908: getting RINEX doppler and L2 - https://postal.unavco.org/pipermail/teqc/2016/002131.html
week 1909: using paths w/ file names - https://postal.unavco.org/pipermail/teqc/2016/002132.html
week 1910: the (un)importance of file names - https://postal.unavco.org/pipermail/teqc/2016/002133.html
week 1911: notices, warnings, and errors - https://postal.unavco.org/pipermail/teqc/2016/002134.html
week 1912: the '-max_rx_SVs' option - https://postal.unavco.org/pipermail/teqc/2016/002137.html
week 1913: the end of '++igs' and '+igs' - https://postal.unavco.org/pipermail/teqc/2016/002140.html
week 1914: splicing together RINEX files - https://postal.unavco.org/pipermail/teqc/2016/002144.html
week 1915: using '-O.int' and '-O.dec' - https://postal.unavco.org/pipermail/teqc/2016/002145.html
week 1916: '+doy' option - https://postal.unavco.org/pipermail/teqc/2016/002146.html
week 1917: '-tbin' and '-ast' options - https://postal.unavco.org/pipermail/teqc/2016/002152.html
week 1918: mp12 RMS before/after Oct 2013 - https://postal.unavco.org/pipermail/teqc/2016/002158.html
week 1919: the global windowing options - https://postal.unavco.org/pipermail/teqc/2016/002159.html
week 1920: '-M.dec' and '-N.dec' options - https://postal.unavco.org/pipermail/teqc/2016/002163.html
week 1921: combining time filtering options - https://postal.unavco.org/pipermail/teqc/2016/002176.html
week 1922: helping me (or someone else on the list) help you - https://postal.unavco.org/pipermail/teqc/2016/002187.html
week 1923: the "build" line - https://postal.unavco.org/pipermail/teqc/2016/002190.html
week 1924: the qc '-w[idth]' option - https://postal.unavco.org/pipermail/teqc/2016/002193.html
week 1925: qc with explicit time windowing - https://postal.unavco.org/pipermail/teqc/2016/002194.html
week 1926: the '+rx_state' option - https://postal.unavco.org/pipermail/teqc/2016/002200.html
week 1927: the '-O.sum' option - https://postal.unavco.org/pipermail/teqc/2016/002204.html
week 1928: the '+meta' and '+mds' options - https://postal.unavco.org/pipermail/teqc/2016/002206.html
week 1930: more on '-O.sum' - https://postal.unavco.org/pipermail/teqc/2017/002207.html
week 1931: the '-O.s[ystem]' option - https://postal.unavco.org/pipermail/teqc/2017/002208.html
week 1932: leap seconds - https://postal.unavco.org/pipermail/teqc/2017/002215.html
week 1936: what you can (and shouldn't) do in a RINEX obs file - https://postal.unavco.org/pipermail/teqc/2017/002229.html
week 1938: the '+psp' option - https://postal.unavco.org/pipermail/teqc/2017/002231.html
week 1939: the '+diag' option - https://postal.unavco.org/pipermail/teqc/2017/002235.html
week 1951: '-n_<system>' and SV filtering options - https://postal.unavco.org/pipermail/teqc/2017/002277.html
week 1953: more with '+diag' option - https://postal.unavco.org/pipermail/teqc/2017/002287.html
week 1954: using '+diag' output to split raw files - https://postal.unavco.org/pipermail/teqc/2017/002290.html
week 1955: current qc notation - https://postal.unavco.org/pipermail/teqc/2017/002302.html
week 1956: the '+qcq' option - https://postal.unavco.org/pipermail/teqc/2017/002304.html
week 1957: using Trimble formats - https://postal.unavco.org/pipermail/teqc/2017/002305.html
week 1958: ToC != ToE messages - https://postal.unavco.org/pipermail/teqc/2017/002310.html
week 1959: receivers vs. formats - https://postal.unavco.org/pipermail/teqc/2017/002311.html
week 1960: when the '-week' option is very wrong to use - https://postal.unavco.org/pipermail/teqc/2017/002314.html
week 1961: "less" is usually best - https://postal.unavco.org/pipermail/teqc/2017/002315.html
week 1962: using GPS L2C with teqc - https://postal.unavco.org/pipermail/teqc/2017/002316.html
week 1964: the '+eds' options - https://postal.unavco.org/pipermail/teqc/2017/002317.html
week 1965: handling RINEX comment lines - https://postal.unavco.org/pipermail/teqc/2017/002324.html
week 1966: the '+dUTC_p' options - https://postal.unavco.org/pipermail/teqc/2017/002331.html
week 1967: the strange position from '+meta' - https://postal.unavco.org/pipermail/teqc/2017/002355.html
week 1972: what shows up as metadata in RINEX headers - https://postal.unavco.org/pipermail/teqc/2017/002362.html
week 1973: GPS L2C navigation messages - https://postal.unavco.org/pipermail/teqc/2017/002363.html
week 1974: the '+ion_p' options - https://postal.unavco.org/pipermail/teqc/2017/002370.html
week 1975: the '+event' options - https://postal.unavco.org/pipermail/teqc/2017/002372.html
week 1976: options '+smtt' (default) vs. '-smtt' - https://postal.unavco.org/pipermail/teqc/2017/002374.html
week 1977: the reported interval with '+meta' for a RINEX obs file - https://postal.unavco.org/pipermail/teqc/2017/002377.html
week 1978: the '-N.dUTC' options - https://postal.unavco.org/pipermail/teqc/2017/002378.html
week 1979: the various qc elevation angles - https://postal.unavco.org/pipermail/teqc/2017/002383.html
week 1980: avoid in RINEX: Transit data - https://postal.unavco.org/pipermail/teqc/2017/002385.html
week 1981: avoid in RINEX: epoch flag = 6 - https://postal.unavco.org/pipermail/teqc/2017/002389.html
week 1982: avoid in RINEX: RCV CLOCK OFFS APPL = 1 - https://postal.unavco.org/pipermail/teqc/2018/002392.html
week 1983: don't count on in RINEX: receiver clock offset per epoch - https://postal.unavco.org/pipermail/teqc/2018/002393.html
week 1984: requirements for multiple target files/stdin - https://postal.unavco.org/pipermail/teqc/2018/002410.html
week 1985: default output for various input - https://postal.unavco.org/pipermail/teqc/2018/002412.html
week 1986: the '+latency' options - https://postal.unavco.org/pipermail/teqc/2018/002419.html
week 1987: the 'O.px and 'O.pg' options - https://postal.unavco.org/pipermail/teqc/2018/002422.html
week 1988: the '+relax' option - https://postal.unavco.org/pipermail/teqc/2018/002423.html
week 1992: the '+x_tilt' options - https://postal.unavco.org/pipermail/teqc/2018/002452.html
week 1993: GLONASS: slot and freq. chnl. numbers - https://postal.unavco.org/pipermail/teqc/2018/002453.html
week 1994: GLONASS: slot numbers > 24 - https://postal.unavco.org/pipermail/teqc/2018/002454.html
week 1995: GLONASS: signals - https://postal.unavco.org/pipermail/teqc/2018/002456.html
week 1996: GLONASS: broadcast ephemeris - https://postal.unavco.org/pipermail/teqc/2018/002457.html
week 1997: GLONASS: system time and broadcast time parameters - https://postal.unavco.org/pipermail/teqc/2018/002458.html
week 1998: qc: 'lite' vs. 'full' - https://postal.unavco.org/pipermail/teqc/2018/002470.html
week 1999: qc: the 'full' point-position and the antenna 'height' - https://postal.unavco.org/pipermail/teqc/2018/002474.html
week 2000: qc: what's a "complete observation"? - https://postal.unavco.org/pipermail/teqc/2018/002475.html
week 2001: qc: percentage of actual to expected complete observations - https://postal.unavco.org/pipermail/teqc/2018/002483.html
week 2014: qc: interpreting slips - https://postal.unavco.org/pipermail/teqc/2018/002521.html
week 2015: qc: loss-of-lock - https://postal.unavco.org/pipermail/teqc/2018/002524.html
week 2016: qc: observations per slip - https://postal.unavco.org/pipermail/teqc/2018/002526.html
week 2017: qc: multipath rms - https://postal.unavco.org/pipermail/teqc/2018/002527.html
week 2018: qc: signal-to-noise - https://postal.unavco.org/pipermail/teqc/2018/002532.html
week 2019: qc: the ASCII time plot - https://postal.unavco.org/pipermail/teqc/2018/002534.html
week 2020: qc: little known (but sometimes useful) options - https://postal.unavco.org/pipermail/teqc/2018/002535.html
week 2021: qc: qc full: the '-dn' and '+dn' ASCII time plot lines, part I - https://postal.unavco.org/pipermail/teqc/2018/002544.html

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