Question

In the context of Global Navigation Satellite System positioning, the Saastamoinen model provides a correction for ____________

• A. \( \text{zenith hydrostatic delay} \)
• B. \( \text{slant hydrostatic delay} \)
• C. \( \text{zenith total delay} \)
• D. \( \text{slant total delay} \)

Hint:

The Saastamoinen model specifically addresses the {zenith hydrostatic delay}, not the wet or slant components. Always distinguish between zenith and slant delays in GNSS error modeling.

Answer 1

The Correct Option is A

The Saastamoinen model is a widely used empirical model for estimating the zenith hydrostatic delay (ZHD) in GNSS (Global Navigation Satellite System) positioning. The ZHD accounts for the delay caused by the dry gases in the atmosphere, primarily nitrogen and oxygen.

This delay is important for high-precision positioning and needs to be corrected accurately. The model uses surface pressure, latitude, and height to estimate the hydrostatic component of the atmospheric delay in the zenith direction.