[teqc] helpful tip of week 1981

Lou Estey lou at unavco.org
Thu Dec 28 08:11:17 MST 2017


This week's tip: thing #2 allowed in RINEX that you should avoid ...

... or at least not count on.

2) epoch flag = 6 (cycle slip repair): Again, "what's that?" you ask.

This is for cycle slip repair (I think).  E.g. in RINEX 2.11,
ftp://igs.org/pub/data/format/rinex211.txt

------
  |             | If epoch flag = 6:                              |            |
  |             |     6: cycle slip records follow to optionally  |            |
  |             |        report detected and repaired cycle slips |            |
  |             |        (same format as OBSERVATIONS records;    |            |
  |             |         slip instead of observation; LLI and    |            |
  |             |         signal strength blank or zero)          |            |
------

Event flag = 6 is even still allowed in RINEX 3.03,
ftp://igs.org/pub/data/format/rinex303.pdf

------
Epoch flag = 6: EVENT: Cycle slip records follow
- Epoch flag
     o 6: cycle slip records follow to optionally report detected and repaired
       cycle slips (same format at OBSERVATIONS records:
	o slip instead of observation:
	o LLI and signal strength blank or zero)
------

Now, you have to do some digging to find an example of this.  Here's one,
written by Werner Gurtner himself, for the original RINEX "2" specification,
ftp://igs.org/pub/data/format/rinex2.txt in Table A7:

------
      2              OBSERVATION DATA    M (MIXED)           RINEX VERSION / TYPE
...
      4    P1    L1    L2    P2                              # / TYPES OF OBSERV
...
  90  3 24 13 14 12.0000000  0  4G16G12G 9G 6                         -.123456012
   21124965.133       89551.30216     69779.62654  21124972.2754
   23507272.372     -212616.150 7   -165674.789 5  23507288.421
   20828010.354     -333820.093 6   -260119.395 5  20828017.129
   20650944.902      227775.130 7    177487.651 4  20650950.363
                             4  1
            *** ANTISPOOFING ON G 16 AND LOST LOCK           COMMENT
  90  3 24 13 14 12.0000000  6  2G16G 9
                  123456789.0      -9876543.5
                          0.0            -0.5
                             4  2
            ---> CYCLE SLIPS THAT HAVE BEEN APPLIED TO       COMMENT
                 THE OBSERVATIONS                            COMMENT
  90  3 24 13 14 48.0000000  0  4G16G12G 9G 6                         -.123456234
   21128884.159      110143.144 7     85825.18545  21128890.7764
   23487131.045     -318463.297 7   -248152.72824  23487146.149
   20817844.743     -387242.571 6   -301747.22925  20817851.322
   20658519.895      267583.67817    208507.26234  20658525.869

So what does all this mean?  Frankly, I have no idea.  Really.  I'm serious.
It appears that epoch flag = 6 is used to specify slip values, in phase and/or
pseudorange for one or more SVs in an epoch, that are removed from those phase
and/or pseudorange quantities for subsequent epochs, but that's just a guess.
Maybe epoch flag = 6 is used by some post-processing software, maybe in creating
some form of intermediate RINEX.  Or, as far as I know, maybe all this in
modern RINEX is as much of an anachronism as Transit data.  And I have no
real idea what teqc would do if you gave it a real RINEX 2.xx file with
epoch flag = 6 present.

My current advice: If you are successfully using RINEX with epoch flag = 6
for your own purposes, keep doing so and don't release any such RINEX to the
world at large.  (And I never really want to see one.)  Otherwise, if you
even see such a thing, run in the other direction -- or at least don't ask
me for help with it.

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 - http://postal.unavco.org/pipermail/teqc/2016/002067.html
week 1895: qc of high-rate data - http://postal.unavco.org/pipermail/teqc/2016/002071.html
week 1896: UNIX/Linux shells for Windows - http://postal.unavco.org/pipermail/teqc/2016/002072.html
week 1897: '-' vs. '+' teqc options - http://postal.unavco.org/pipermail/teqc/2016/002076.html
week 1898: auto-identification of formats - http://postal.unavco.org/pipermail/teqc/2016/002092.html
week 1899: auto-identification vs. format flags - http://postal.unavco.org/pipermail/teqc/2016/002096.html
week 1900: square brackets in options - http://postal.unavco.org/pipermail/teqc/2016/002105.html
week 1901: using option '+mds' - http://postal.unavco.org/pipermail/teqc/2016/002108.html
week 1902: qc results w/ problematic nav messages - http://postal.unavco.org/pipermail/teqc/2016/002113.html
week 1903: '-no_orb[it]' and '-no_pos[ition]' options - http://postal.unavco.org/pipermail/teqc/2016/002115.html
week 1904: '-week' option - http://postal.unavco.org/pipermail/teqc/2016/002117.html
week 1905: using '+bcf' for XYZ/geodetic conversion - http://postal.unavco.org/pipermail/teqc/2016/002126.html
week 1906: the '+v[erify]' option - http://postal.unavco.org/pipermail/teqc/2016/002128.html
week 1907: '+C2', '+L5', "+L6', '+L7', '+L8', '+all' options - http://postal.unavco.org/pipermail/teqc/2016/002130.html
week 1908: getting RINEX doppler and L2 - http://postal.unavco.org/pipermail/teqc/2016/002131.html
week 1909: using paths w/ file names - http://postal.unavco.org/pipermail/teqc/2016/002132.html
week 1910: the (un)importance of file names - http://postal.unavco.org/pipermail/teqc/2016/002133.html
week 1911: notices, warnings, and errors - http://postal.unavco.org/pipermail/teqc/2016/002134.html
week 1912: the '-max_rx_SVs' option - http://postal.unavco.org/pipermail/teqc/2016/002137.html
week 1913: the end of '++igs' and '+igs' - http://postal.unavco.org/pipermail/teqc/2016/002140.html
week 1914: splicing together RINEX files - http://postal.unavco.org/pipermail/teqc/2016/002144.html
week 1915: using '-O.int' and '-O.dec' - http://postal.unavco.org/pipermail/teqc/2016/002145.html
week 1916: '+doy' option - http://postal.unavco.org/pipermail/teqc/2016/002146.html
week 1917: '-tbin' and '-ast' options - http://postal.unavco.org/pipermail/teqc/2016/002152.html
week 1918: mp12 RMS before/after Oct 2013 - http://postal.unavco.org/pipermail/teqc/2016/002158.html
week 1919: the global windowing options - http://postal.unavco.org/pipermail/teqc/2016/002159.html
week 1920: '-M.dec' and '-N.dec' options - http://postal.unavco.org/pipermail/teqc/2016/002163.html
week 1921: combining time filtering options - http://postal.unavco.org/pipermail/teqc/2016/002176.html
week 1922: helping me (or someone else on the list) help you - http://postal.unavco.org/pipermail/teqc/2016/002187.html
week 1923: the "build" line - http://postal.unavco.org/pipermail/teqc/2016/002190.html
week 1924: the qc '-w[idth]' option - http://postal.unavco.org/pipermail/teqc/2016/002193.html
week 1925: qc with explicit time windowing - http://postal.unavco.org/pipermail/teqc/2016/002194.html
week 1926: the '+rx_state' option - http://postal.unavco.org/pipermail/teqc/2016/002200.html
week 1927: the '-O.sum' option - http://postal.unavco.org/pipermail/teqc/2016/002204.html
week 1928: the '+meta' and '+mds' options - http://postal.unavco.org/pipermail/teqc/2016/002206.html
week 1930: more on '-O.sum' - http://postal.unavco.org/pipermail/teqc/2017/002207.html
week 1931: the '-O.s[ystem]' option - http://postal.unavco.org/pipermail/teqc/2017/002208.html
week 1932: leap seconds - http://postal.unavco.org/pipermail/teqc/2017/002215.html
week 1936: what you can (and shouldn't) do in a RINEX obs file - http://postal.unavco.org/pipermail/teqc/2017/002229.html
week 1938: the '+psp' option - http://postal.unavco.org/pipermail/teqc/2017/002231.html
week 1939: the '+diag' option - http://postal.unavco.org/pipermail/teqc/2017/002235.html
week 1951: '-n_<system>' and SV filtering options - http://postal.unavco.org/pipermail/teqc/2017/002277.html
week 1953: more with '+diag' option - http://postal.unavco.org/pipermail/teqc/2017/002287.html
week 1954: using '+diag' output to split raw files - http://postal.unavco.org/pipermail/teqc/2017/002290.html
week 1955: current qc notation - http://postal.unavco.org/pipermail/teqc/2017/002302.html
week 1956: the '+qcq' option - http://postal.unavco.org/pipermail/teqc/2017/002304.html
week 1957: using Trimble formats - http://postal.unavco.org/pipermail/teqc/2017/002305.html
week 1958: ToC != ToE messages - http://postal.unavco.org/pipermail/teqc/2017/002310.html
week 1959: receivers vs. formats - http://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

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