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GrafNav Batch

Chapter 4

 

 

 

4.3.3GrafNav on Selected Baselines

For additional options, tools, plotting and printing capabilities, or the baseline solution needs improvement, GrafNav can be opened and used for processing. Simply highlight the baseline from the List of Baselines window and select Process | GrafNav on Selected.

4.3.4View Selected Processing Summary

See Section 2.4.4, on Page 54 for information regarding this feature.

4.3.5Load All Solutions

This option loads all existing solutions for all baselines into GrafNav Batch, allowing you to plot and export output files.

4.3.6Load Selected Solutions

This feature is identical to the previous one but applies only to those baselines that are highlighted in the List of Baselines window.

4.3.7Combine Multi-baselines

This feature combines baselines, whether they are singlebase, multi-base or combined. To add an additional combined baseline, select File | Add Combined Baseline.

Once a project has been created and set up, follow the steps in the shaded box to combine baselines.

4.4Settings Menu

4.4.1Global

These options apply to all the baselines in the project and overwrites any individually customized baseline settings.

Process Settings

This feature is similar to that in the Process Menu except that you cannot engage processing. See Section 2.5, on Page 61 for information regarding all the available processing settings.

Datum Settings

The datum set here is applied to all baselines in the project. See Section 2.6.5, on Page 97 for information regarding this feature.

How to combine multi-baselines

1.Add a combined baseline via File | Add Combined Baseline. To change the name on this baseline, right-click it in the List of Baselines window and selecting Rename.

2.Reject epochs that have poor statistics, specify remote initialization, or specify the solution to load before combining baselines. All of these options are available via File | Edit Selected Baseline Settings. An additive PPM and weighting value can be added with this option and used to change the weighting with distance. See Section 4.2.10, on Page 182 for information.

3.Select Process | Combine Selected Multi-Base with all of the baselines still highlighted. This combines these baselines into a single solution.

Continued on the next page.

Outliers can be rejected based on the following parameters:

Error Tolerance – the minimum error before an outlier will be detected. Setting this correctly is important to prevent false errors from being detected. The default value is 0.500 m.

Sigma Tolerance – the number of standard deviations (of the computed position standard deviation) before an error is deemed an outlier. you may wish to use 3- sigma to reduce the number of errors detected, although the default is 2-sigma.

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How to combine multi-baselines cont.

4.Press OK. The additional Combined baseline added in Step 2 will be used as a holding place for the combined solution. When complete, the Combine Multi-Base window appears, displaying statistical information regarding the combination. This window gives an indication of how many epochs were rejected. Monitor these values, those concerning the epochs that were rejected as outliers.

Grid Settings

The grid selected here is used as the project grid and affects all baselines. See Page 116 for information concerning this feature.

Alternate Files

This feature allows for the addition of ephemeris or correction files to be used during processing. Any files added here will be used for all the baselines in the project. See Section 2.3.8, on Page 38 for more information.

4.4.2Selected

These options are only applied to the baselines highlighted in the List of Baselines window at the time that this feature is invoked.

Processing Settings

If this feature is selected, the defined options are copied only to the baselines highlighted in the List of Baselines window. See Section 2.5, on Page 61 for information regarding all the processing settings available.

This feature allows the editing of the processing settings only. To process the baselines once their settings have been edited, highlight them in the List of Baselines window and select Process | Process Selected. This ensures that selected baselines are processed using their customized settings, instead of being over-written with the global settings.

Baseline Settings

See Section 4.2.10, on Page 182 for information regarding the use of this feature.

Alternate Files

This feature allows for the addition of ephemeris or correction files to be used during processing. Any files added here are used only for those baselines highlighted in the List of Baselines window. See Section 2.3.8, on

Page 38 for more information.

4.4.3Copy Processing Options

This feature copies the processing options from one baseline to another.

Once the settings have been transferred, the baselines will have to be reprocessed in order for the new options to take effect.

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