DM-0231

Description

 Driver to decode position (latitude, longitude and height) from a Novatel GPS Receiver, outputting the so-called BESTPOS log format.

Driver Information

 No Driver Information

Decoding Notes

The following fields are decoded:

From the header the GPS Weeknumber and Seconds, to timestamp the message

The driver will only use this time when your template database is also connected to a working PPS system, and cmdline parameter "UTC" is used. Otherwise the time is used when the datastring is received at port.

The time of the datastring can be seen in the Positioning System Display on the GPS Time field.

The Solution status

Status can be seen as a number in the Positioning System Display on the Solution Mode field. Normally should be zero, meaning all is okay. Please refer to the NovAtel OEM4 Family User Manual, Table Solution Status, to see the other possible status values.

The solution status can also be tracked in the Alert Display:

Select a Raw Data Alert, type "Position Mode outside limit". Use for lower and upper limit zero.

The latitude, longitude and height, and the Standard deviations

The Sd's can be seen in the Positioning System Display on the SD's fields.

The value in the RMS field is derived from these Sd's.

The Sd's can also be seen in the Observation Physics Display in the Quality column.

The Sd's values can also be tracked in the Alert Display:

Select a Raw Data Alert, type "Quality indicator outside limit".

Age of diff.

Value can be seen in the Positioning System Display on the Differential Age field

The number of observation tracked.

Value can be seen in the Positioning System Display on the Satellites fields.

The value can also be tracked in the Alert Display:

Select a Raw Data Alert, type "Number of satellites outside limit".

The checksum to validate the datastring. Use cmline "NOCS" to disable checking the sum.