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Navigation

- Signal interference:

• Interference: Electronic noise from other sources can interfere with signals
• Shielding: Signal blocking from buildings, mountains, or forests can

reduce the receiver's ability to pick up signals.

- Geometric errors:

• Satellite constellation: If the available satellites are closely spaced, this

can affect the accuracy of the position determination.

9.10.2.4 Troubleshooting Methods

Understanding the potential error types and having effective troubleshooting

techniques can help users of GNSS systems achieve more reliable and accurate

navigation solutions.

Examples include:

- Check whether there are enough satellites in view and their position relative

to the receiver.

- Ensure that the GNSS receiver is properly calibrated and updated with the

latest software and map information.

- Use a GNSS analysis tool to monitor signal strength and quality to identify

problems.
- Use augmentation: Implement systems such as DGPS or SBAS to improve

accuracy and compensate for errors.

- Test in different environments, such as open areas, to minimize multipath

effects and signal blockage.

- Use other navigation methods (such as INS or mapping) to compare and

confirm GPS results.

9.10.2.5 Back-up

Back-up methods for GNSS systems are essential to ensure continuous and

reliable navigation capability, especially in situations where satellite signals may

be unavailable or inaccurate.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 893