3. GNSS and Satellite Positioning

Augmentation Systems — Quiz

Test your understanding of augmentation systems with 5 practice questions.

Practice Questions

Question 1

What is the primary difference between SBAS and GBAS in terms of coverage and infrastructure?

Question 2

If standalone GNSS has horizontal accuracy of 5 m (1σ) and SBAS improves this to 1 m (1σ), what is the percentage reduction in error when using SBAS?

Question 3

A Virtual Reference Station (VRS) network advertises horizontal accuracy of 8 mm + 1 ppm of baseline length (1σ). For a user 5 km from the nearest reference station, what is the expected 1σ horizontal error in millimetres?

Question 4

If SBAS correction latency is 10 s and a survey rover moves at 2 m/s, what is the maximum positional error introduced by latency?

Question 5

Which augmentation system delivers centimetre-level positioning corrections over the internet using a network of permanent reference stations?