Which term describes a GNSS error source listed in the material?

Which term describes a GNSS error source listed in the material?

• A. Clock Error
• B. Night Effect
• C. Attenuation
• D. Skip Zone

Answer: (A)

Timing accuracy is fundamental in GNSS. Every pseudorange measurement is built from the actual distance to a satellite plus biases that come from imperfect clocks. The primary clock-related bias comes from the satellite’s clock and the receiver’s own clock error. Because clocks are not perfectly synchronized or perfect in rate, these timing inaccuracies show up as a bias in the measured range, which the navigation solution must estimate and compensate for. That’s why the term describing a GNSS error source listed in the material is clock error. It directly represents the timing-related bias that affects all range measurements and, if not accounted for, leads to position errors. Other terms listed are not standard GNSS error sources in this context. Night Effect isn’t a recognized GNSS bias term, attenuation describes signal loss or weakening rather than a navigation-range bias, and skip zone refers to propagation phenomena not used as a GNSS error source label.

Timing accuracy is fundamental in GNSS. Every pseudorange measurement is built from the actual distance to a satellite plus biases that come from imperfect clocks. The primary clock-related bias comes from the satellite’s clock and the receiver’s own clock error. Because clocks are not perfectly synchronized or perfect in rate, these timing inaccuracies show up as a bias in the measured range, which the navigation solution must estimate and compensate for.

That’s why the term describing a GNSS error source listed in the material is clock error. It directly represents the timing-related bias that affects all range measurements and, if not accounted for, leads to position errors.

Other terms listed are not standard GNSS error sources in this context. Night Effect isn’t a recognized GNSS bias term, attenuation describes signal loss or weakening rather than a navigation-range bias, and skip zone refers to propagation phenomena not used as a GNSS error source label.