[teqc] Observation file problems

Stephan Koch SKOCH at sli.wcape.gov.za
Fri Apr 4 08:11:37 MDT 2008


Lou,

Thanks for your reply. Just to make 100%sure. Do the users have to upgrade their post processing software to cater for more that 12 receivers.

Regards

Stephan Koch
Control Industrial Technician
Directorate: Survey Services
T: +27 (0)21 658 4362
F: +27 (0)21 658 4357

skoch at sli.wcape.gov.za
http://w3sli.wcape.gov.za
www.trignet.co.za

>>> Lou Estey <lou at unavco.org> 2008/04/04 03:24 PM >>>
Stephan,

> We are using Trimble NetrS and NetR5 receivers in our Network. Using
> TEQC to create the observation files works fine.  If there are 12 or
> less satellites the Rinex observation file is OK as with epoch
> 08  4  3  1  5 18.0000000. If there are 13 or more satellites as with
> epoch 08  4  3  1  5 19.0000000 the satellites info are written in two
> lines. See attachment.

That's what the RINEX specification has required since the first receiver
capable of tracking more than 12 SVs (probably the first GPS/GLONASS rxs);
see http://www.aiub-download.unibe.ch/rinex/rinex211.txt in Table A2:

  | EPOCH/SAT   | - Epoch :                                       |            |
  |     or      |   - year (2 digits, padded with 0 if necessary) |  1X,I2.2,  |
  | EVENT FLAG  |   - month,day,hour,min,                         |  4(1X,I2), |
  |             |   - sec                                         |   F11.7,   |
  |             |                                                 |            |
  |             | - Epoch flag 0: OK                              |   2X,I1,   |
  |             |              1: power failure between           |            |
  |             |                 previous and current epoch      |            |
  |             |             >1: Event flag                      |            |
  |             | - Number of satellites in current epoch         |     I3,    |
  |             | - List of PRNs (sat.numbers with system         | 12(A1,I2), |  <- note!
  |             |   identifier, see 5.1) in current epoch         |            |
  |             | - receiver clock offset (seconds, optional)     |   F12.9    |
  |             |                                                 |            |
  |             |   If more than 12 satellites: Use continuation  |    32X,    |  <- note!
  |             |   line(s)                                       | 12(A1,I2)  |  <- note!

> This is causing problems to the users.

Then some of your users must have non-compliant software wrt the RINEX spec.

Hope this helps.

cheers,
--lou

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

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                                                -- Leon Lederman
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