[teqc] JAVAD GNSS JPS translation issue: SBAS and Galileo pseudoranges and phases

Lou Estey lou at unavco.org
Wed Jun 15 09:57:52 MDT 2016


All,

I found out yesterday that on 6 March 2014 JAVAD GNSS changed a couple of key parameters
that effect the decoding of SBAS and Galileo pseudorange and phase values when using
many of the JPS messages which includes (at least):

- [rc], [r1], [r2], [r3], [r5], [rl] for pseudoranges

- [1R], [2R], [3R], [5R], [lR] for relative pseudoranges

- [1r], [2r], [3r], [5r], [lr] for relative pseudoranges

- [CP], [1P], [2P], [3P], [5P], [lP] for relative phases if using
    either of the above sets of pseudoranges

- [cp], [1p],[2p], [3p], [5p], [lp] for integer relative phases if using
    either of the above sets of pseudoranges

There is no impact:

- on GPS, GLONASS, QZSS, or Beidou pseudorange or phase values

- if using the [RC], [R1], [R2], [R3], [R5], [Rl] messages for pseudoranges

- if using the [PC], [P1], [P2], [P3], [P5], [Pl] messages for carrier phases

- if using the [pc], [p1], [p2], [p3], [p5], [pl] messages for carrier phases

Note 1: This does not impact reading of Topcon TPS messages.

Note 2: Decoding in teqc using the original key parameters was added to teqc
on 9 May 2012 for Galileo, Beidou, and QZSS -- so versions of teqc from that
date forward would yield the correct SBAS and Galileo pseudorange and phase
values (when using the specific JPS messages listed above) until the JAVAD GNSS
receiver firmware was updated after 6 March 2014.

Note 3: You can figure out which JPS messages your data has by using the
'+diag' (= "turn parsing and other diagnostics on") option which send output
to standard error (stderr); suppress conversion to RINEX with '+mds' or '+meta',
e.g. with most UNIX/Linux shells:

teqc -jav jps +diag +mds file.jps 2>&1 | more

... and look at the message IDs at the end of lines starting with "Javad JPS frame".

A correction to teqc will obviously be in the next release, but I'm not
sure when that will be since we're in the middle of several changes right now.
However, if you need an interim version in the meantime, please contact me directly.

Sorry about this.

cheers,
--lou

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Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
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      WWW:  http://www.unavco.org   http://jules.unavco.org

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