GNSS network adjustment

by Micha ⌂ @, Tuesday, July 09, 2019, 18:16 (6 days ago) @ marcelac

Hi,

Ok so what I understand is there might not be a direct path from the way I am producing the baselines to something usable in JAG3D.

No, that's not right. I'm unable to understand your values. I'm unable to derive a relationship between your baselines and your provided coordinates. If I don't understand the problem, I'm unable to answer your question.

So may I ask how do other people produce GNSS baselines that can be used?

Let us take a look to an example, given in Hofmann-Wellenhof et al, p. 59ff.

The fixed reference point is given by

SB 4213857.480 1025292.070 4664733.470

the new points read

KK 4214436.777 1025493.730 4663835.190
KS 4213099.408 1022546.373 4665836.887
LK 4215184.630 1021692.539 4664261.604

and the observed baselines are given by

SB KK   579.297   201.660  -898.280 0.01 0.01 0.01
KK KS -1337.369 -2947.357  2001.697 0.01 0.01 0.01
KS LK  2085.222  -853.834 -1575.283 0.01 0.01 0.01
SB KS  -758.051 -2745.673  1103.395 0.01 0.01 0.01
LK KK  -747.852  3801.192  -426.417 0.01 0.01 0.01

The published results are

KK X 4214436.785 Y 1025493.739 Z 4663835.181
KS X 4213099.421 Y 1022546.388 Z 4665836.874
LK X 4215184.640 Y 1021692.551 Z 4664261.595

And the adjusted results given by JAG3D are

[image]

Thus, JAG3D was able to reproduce the results given in Hofmann-Wellenhof et al, p. 64.

The question is, why it is impossible to transform your original baselines to the baselines derived by coordinates?

/Micha

--
applied-geodesy.org - OpenSource Least-Squares Adjustment Software for Geodetic Sciences

Tags:
GNSS, example, network, adjustment, Hofmann-Wellenhof


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