Instrument2RmsPlotGrid

This program computes an RMS plot grid from one or more inputfileInstrument containing 3D data (e.g. orbits or station positions), which can then be plotted as gridded data in PlotGraph. The RMS is computed from the difference between inputfileInstrument and inputfileInstrumentReference. All instrument files must be synchronized (see InstrumentSynchronize).

Each separate inputfileInstrument represents an entry (e.g. a satellite or station) in the resulting grid. Therefore, providing, for example, 32 orbit files of GPS satellites results in a grid with columns: mjd, id (0-31), rms.

The first three data columns of the instrument data are considered for computation of the RMS values. The factor can be set to, for example, sqrt(3) to get 3D instead of 1D RMS values.

If timeIntervals are provided, each inputfileInstrument and inputfileInstrumentReference serves as a template with variable loopTime. This allows concatenation of instrument files, for example to create a month-long RMS plot grid from daily GPS orbit files (see below).

Helmert parameters between the two frames can be estimated each epoch optionally if estimateShift, estimateScale, or estimateRotation are set. It uses a robust least squares adjustment.

instrument2RmsPlotGrid
Figure: Comparison of estimated GPS orbits with IGS final solution.

NameTypeAnnotation
outputfileRmsPlotGrid
filenamecolumns: mjd, id, rms
outputfileHelmertTimeSeries
filenamecolumns: mjd, tx, ty, tz, scale, rx, ry, rz
inputfileInstrument
filenameone file per satellite/station
inputfileInstrumentReference
filenameone file per satellite/station, same order as above
timeIntervals
timeSeriesfor {loopTime} variable in inputfile
factor
doublee.g. sqrt(3) for 3D RMS
estimateShift
booleancoordinate center every epoch
estimateScale
booleanscale factor of position every epoch
estimateRotation
booleanrotation every epoch
huber
doublefor robust least squares
huberPower
doublefor robust least squares
huberMaxIteration
uint(maximum) number of iterations for robust estimation