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How to improve GNSS acquisition and accuracy
How to improve GNSS acquisition and accuracy
Updated over 6 months ago

Description:

The minimum number of satellites for a reliable position is 5 and HDOP (deviation) should be 1.5 or lower.

To improve your GNSS acquisition, retention and accuracy, please try the following.

Steps:

On the physical tracker:

- Make sure the antenna (label side of the tracker in case of an internal antenna) is:

  • Facing up perpendicular to the sky.

  • It is not tilted more than 45 degrees in any axis, with the top surface perpendicular to the sky.

  • Installed as close to the windshield as possible.

  • Without any metallic objects or wiring in between.

- You could acquire an external GNSS antenna to improve GNSS fix acquisition. Check compatibility here:

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- If problems persist, try doing a deep reset:

  • disconnect from power supply

  • disconnect from internal battery (you can do this physically or via Advanced Configurator "Battery off" button).

  • reconnect internal battery

  • reconnect power supply

On the configuration:

- Make sure all three GNSS systems are enabled: GPS, GLONASS and GALILEO. This will increase satellite availability and thus fix and accuracy.

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Filtering unreliable coordinates:

Without GPS fix:

If record header looks like the one below (all GNSS derived values are maxed out / error), it means the record was generated and sent without first acquiring a GNSS fix.

Coordinates will be:

214.7483648

214.7483648

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While this does not usually happen, because the device will not send a record unless a valid GNSS fix has been previously acquired after first power on / reset, if Send data without GPS fix is checked, the device will nonetheless send the record with the faulty header.

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To avoid receiving such records, simply uncheck the box:

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With gps fix:

- Enable Navigation filtering

  • Stationary (discards coordinates that do not meet accuracy criteria when vehicle is not moving).

  • Active (discards coordinates that do not meet accuracy criteria when vehicle is moving).

(example below is the default, more information HERE)

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