[teqc] GLONASS navigation error

Uwe Hessels uwe.hessels at bkg.bund.de
Wed Jun 18 02:55:11 MDT 2008


Hi Lou,

on day 168/2008 we found a difference in the GLONASS navigation file(s) created by Leica Spider
Rinex Converter and teqc.

For the ephemeris epoch 16/6/08 00:15:00 the epoch time is recorded 00:15:60 for all satellites.
This one minute difference causes a huge error in the position of the satellites resulting in a
wrong position estimate.

teqc:
23 08  6 16  0 15 60.0-1.270640641451D-04 3.637978807092D-12 0.000000000000D+00
    1.060660107422D+04 1.154708862305D-01-9.313225746155D-10 0.000000000000D+00
   -3.738262207031D+03 3.132190704346D+00 0.000000000000D+00 3.000000000000D+00
    2.290192138672D+04 4.613704681396D-01-1.862645149231D-09 0.000000000000D+00
 6 08  6 16  0 15 60.0-2.356832846999D-04-1.818989403546D-12 0.000000000000D+00
   -8.776443359375D+03-2.785131454468D+00-3.725290298462D-09 0.000000000000D+00
    7.726870605469D+03-1.409372329712D+00 9.313225746155D-10 1.000000000000D+00
    2.253238769531D+04-6.020488739014D-01 0.000000000000D+00 0.000000000000D+00
 8 08  6 16  0 15 60.0-5.155075341463D-04-3.819877747446D-11 0.000000000000D+00
    2.184211523438D+04-3.900089263916D-01 0.000000000000D+00 0.000000000000D+00
    1.267927441406D+04-3.404989242554D-01-1.862645149231D-09 6.000000000000D+00
    3.644704101562D+03 3.509963989258D+00-1.862645149231D-09 1.000000000000D+00
13 08  6 16  0 15 60.0-2.015456557274D-04-9.094947017729D-13 0.000000000000D+00
    1.810163134766D+04 8.625526428223D-01 2.793967723846D-09 0.000000000000D+00
   -1.598760449219D+04-7.383699417114D-01 0.000000000000D+00-2.000000000000D+00
    8.178684570312D+03-3.344614028931D+00-2.793967723846D-09 0.000000000000D+00
14 08  6 16  0 15 60.0-1.510959118605D-04 1.818989403546D-12 0.000000000000D+00
    4.022560058594D+03 2.355226516724D+00 0.000000000000D+00 0.000000000000D+00
   -1.410086572266D+04-1.627235412598D+00 9.313225746155D-10 4.000000000000D+00
    2.083264941406D+04-1.561271667480D+00-1.862645149231D-09 0.000000000000D+00
24 08  6 16  0 15 60.0-3.521610051394D-05-1.818989403546D-12 0.000000000000D+00
    5.221098632812D+03-6.629467010498D-02 9.313225746155D-10 0.000000000000D+00
   -2.124045214844D+04 1.794281005859D+00 9.313225746155D-10 2.000000000000D+00
    1.307261474609D+04 2.954722404480D+00-1.862645149231D-09 0.000000000000D+00
15 08  6 16  0 15 60.0 6.420072168112D-05 0.000000000000D+00 9.600000000000D+02
   -1.269282958984D+04 2.539728164673D+00-2.793967723846D-09 0.000000000000D+00
   -3.776883789062D+03-1.573020935059D+00 1.862645149231D-09 0.000000000000D+00
    2.177486279297D+04 1.218438148499D+00 0.000000000000D+00 0.000000000000D+00

Leica Spider:
23 08 06 16 00 15  0.0-1.270640641451D-04 3.637978807092D-12 0.000000000000D+00
    1.060660107422D+04 1.154708862305D-01-9.313225746155D-10 0.000000000000D+00
   -3.738262207031D+03 3.132190704346D+00 0.000000000000D+00 3.000000000000D+00
    2.290192138672D+04 4.613704681396D-01-1.862645149231D-09 0.000000000000D+00
 6 08 06 16 00 15  0.0-2.356832846999D-04-1.818989403546D-12 0.000000000000D+00
   -8.776443359375D+03-2.785131454468D+00-3.725290298462D-09 0.000000000000D+00
    7.726870605469D+03-1.409372329712D+00 9.313225746155D-10 1.000000000000D+00
    2.253238769531D+04-6.020488739014D-01 0.000000000000D+00 0.000000000000D+00
 8 08 06 16 00 15  0.0-5.155075341463D-04-3.819877747446D-11 0.000000000000D+00
    2.184211523438D+04-3.900089263916D-01 0.000000000000D+00 0.000000000000D+00
    1.267927441406D+04-3.404989242554D-01-1.862645149231D-09 6.000000000000D+00
    3.644704101563D+03 3.509963989258D+00-1.862645149231D-09 1.000000000000D+00
13 08 06 16 00 15  0.0-2.015456557274D-04-9.094947017729D-13 0.000000000000D+00
    1.810163134766D+04 8.625526428223D-01 2.793967723846D-09 0.000000000000D+00
   -1.598760449219D+04-7.383699417114D-01 0.000000000000D+00-2.000000000000D+00
    8.178684570313D+03-3.344614028931D+00-2.793967723846D-09 0.000000000000D+00
14 08 06 16 00 15  0.0-1.510959118605D-04 1.818989403546D-12 0.000000000000D+00
    4.022560058594D+03 2.355226516724D+00 0.000000000000D+00 0.000000000000D+00
   -1.410086572266D+04-1.627235412598D+00 9.313225746155D-10 4.000000000000D+00
    2.083264941406D+04-1.561271667480D+00-1.862645149231D-09 0.000000000000D+00
24 08 06 16 00 15  0.0-3.521610051394D-05-1.818989403546D-12 0.000000000000D+00
    5.221098632813D+03-6.629467010498D-02 9.313225746155D-10 0.000000000000D+00
   -2.124045214844D+04 1.794281005859D+00 9.313225746155D-10 2.000000000000D+00
    1.307261474609D+04 2.954722404480D+00-1.862645149231D-09 0.000000000000D+00
15 08 06 16 00 15  0.0 6.420072168112D-05 0.000000000000D+00 9.600000000000D+02
   -1.269282958984D+04 2.539728164673D+00-2.793967723846D-09 0.000000000000D+00
   -3.776883789063D+03-1.573020935059D+00 1.862645149231D-09 0.000000000000D+00
    2.177486279297D+04 1.218438148499D+00 0.000000000000D+00 0.000000000000D+00


Because of the size, i do not want to attach the corresponding files.

-- 
Mit freundlichen Gruessen / Best regards, Uwe Hessels
_________________________________________________
  Dipl.Ing. Uwe Hessels
  Bundesamt fuer Kartographie und Geodaesie /
  Federal Agency for Cartography and Geodesy
  Geodätisches Observatorium Wettzell       /
  Geodetic Observatory Wettzell
  Sackenrieder Str. 25
  D - 93444 Bad Koetzting / Germany

  Phone:           +49 (0) 9941 / 603-208
  FAX:             +49 (0) 9941 / 603-222
  switchboard      +49 (0) 9941 / 603-0
  e-mail (office)  uwe.hessels at bkg.bund.de
  e-mail (altern.) hessels at fs.wettzell.de
  URL              http://www.fs.wettzell.de
_________________________________________________


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