Reference Information
LD900 Installation and Oper ations M anual
76
Content
Format
Unit Notes
No. of SV’s (n)
I
[-]
No. of GNSS satellites used for this fix
No. of Ref. Stations (r)
I
[-]
No. of ref. stations used for fix. Set to 0 for non-differential solutions
PRN’s of SV’s Used
A*n
[-]
GNSS satellites used for this fix in RINEX format (G -GPS, R-GLONASS, E-
Galileo, C-BeiDou, J-QZSS). Separated by commas (e.g. G01,R03)
Ref. Station ID
I*r
[-]
Reference stations used for this fix. Separated by commas. Field(s) will not
appear for non -differential solutions.
End Character
A1
[-]
] (Close string)
CRLF
A2
TRINAV Version 4 Definitions Commentary
1.
CSV f ormatting is provided as a guide and it is possible and expected that greater resolution will be
output if required.
2.
The "Nav point no." is a unique integer identifying the position. It should be manually entered into the
sof tware according to requests from Positioning Engineers. Alternatively, this should start from 1 and be
incremented if several positions are output from the same system.
3.
WGS84 ellipsoid and datum must be used. Must be antenna height above the WGS84 ellipsoid.
4.
The Variance and Covariance terms are elements from the Variance-Covariance matrix of the position fix
computation (un-scaled).
a.
Unit Variance currently unavailable and will be a NULL field for the moment.
5.
The External Reliability is the maximum positional effect of an undetectable error in an observation. This
quantity is related to the power of the test (the probability that the MDE would be detected) and the
significance level used.
a.
The values recommended by IMCA/OGP should be used (see
IMCA/OGP Guidelines for GNSS
positioning in the oil & gas industry
Report No. 373-19 or IMCA S015, June 2011) i.e. a
Significance level of test 1% and the Power of the test 80%.
b.
If values other than those given above are used, this must be explicitly stated by the contractor.
c.
VERIPOS
statistics are implemented as per the IMCA/OGP ‘Guidelines for GNSS positioning in
the oil & gas industry’ Report No. 373-19 or IMCA S015, June 2011, unless otherwise indicated.
6.
TRINAV V4 Fix Status Codes:
7.
TRINAV V4 Computation Type Codes:
Status Code
Meaning
0
No or Bad Fix
1
Altitude Aiding (Weighted Height used in Fix)
2
Altitude Hold (2D Fix)
3
3D Fix
4
3D Fix INS aided
5
INS only (dead reckoning)
Type Code
Meaning
0
No Corrections
1
Single Frequency DGNSS
2
Dual Frequency DGNSS
3
PPP (Satellite Orbit and Clock Corrections)
4
PPP-AR (Ambiguity Resolution) using phase
bias information.
5
Other
