GNSS Processing Parameters

GNSS Post-Processing is used for Delph INS Subsea with GNSS option.

 

GNSS post-processing is improved by:

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Using corrections broadcast by base stations

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Processing data in several passes (forward and backward)

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Optimizing the coupling between inertial processing and GNSS processing only with GNSS engine

RTK GNSS post-processing allows achieving centimeter-level positioning using information sent by a base station to correct for the various atmospheric model errors and satellite trajectory errors impacting the satellite distance measurements, see figure below.

When the base station – rover GNSS wireless communication channel is lost, for instance because the INS is located in a challenging environment (such as urban environment) the model correction cannot be achieved, and the GNSS position solution is highly degraded.

The real-time position computed by the GNSS can generally be greatly improved in post-processing by three mechanisms:

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By using the model error correction during the whole navigation, if the base station post-processing file has been logged

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By using public base station data which is merged with the rover GNSS post-processing, if you did not log any base station during the survey

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By using optimized algorithms which allow taking into account the past and the future to compute optimal position values

Delph INS Subsea allows post-processing the internal GNSS in any condition:

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Without any base station post-processing file.

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With a private base station post-processing file.

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With a public base station post-processing file.