What is the purpose of integrity monitors like RAIM and Fault Detection and Exclusion (FDE) in GNSS navigation?

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Multiple Choice

What is the purpose of integrity monitors like RAIM and Fault Detection and Exclusion (FDE) in GNSS navigation?

Integrity monitors in GNSS navigation are all about ensuring the trustworthiness of the position solution by checking the measurements for faults. RAIM uses redundancy among satellite measurements to test whether the observed ranges are internally consistent. If a satellite’s measurement doesn’t fit with the others, the monitor flags a fault and that satellite can be discarded from the solution. Fault Detection and Exclusion takes this a step further by actively detecting potential faults and excluding the suspect measurements to keep the navigation solution reliable. This matters because a single erroneous measurement—caused by clock errors, multipath, or signal obstruction—can skew the computed position. By continuously screening measurements and removing faulty data, the system maintains the intended level of integrity, which is crucial for safe and accurate navigation. The other options don’t align with what integrity monitoring does. Increasing screen resolution, calibrating antenna gain, or reducing power consumption aren’t about ensuring the trustworthiness of GNSS measurements or excluding bad data.

Integrity monitors in GNSS navigation are all about ensuring the trustworthiness of the position solution by checking the measurements for faults. RAIM uses redundancy among satellite measurements to test whether the observed ranges are internally consistent. If a satellite’s measurement doesn’t fit with the others, the monitor flags a fault and that satellite can be discarded from the solution. Fault Detection and Exclusion takes this a step further by actively detecting potential faults and excluding the suspect measurements to keep the navigation solution reliable.

This matters because a single erroneous measurement—caused by clock errors, multipath, or signal obstruction—can skew the computed position. By continuously screening measurements and removing faulty data, the system maintains the intended level of integrity, which is crucial for safe and accurate navigation.

The other options don’t align with what integrity monitoring does. Increasing screen resolution, calibrating antenna gain, or reducing power consumption aren’t about ensuring the trustworthiness of GNSS measurements or excluding bad data.

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