GNSS ionosphere delay
Supplied-VTEC delay using the GPS Klobuchar obliquity factor, not the full broadcast correction.
SIDUS educational calculator. Category satellite. Tags: geometry, GNSS, satellite. Pure SI. Not flight software.
Formula
d = (40.3 TEC / f^2) F, F = 1 + 16(0.53 - E)^3
Supplied-VTEC GPS obliquity delay
Primary sources
- IS-GPS-200 (GPS Directorate): Broadcast ionospheric obliquity factor F = 1 + 16(0.53 - E)^3. The ionosphere tool applies that factor to a supplied vertical TEC. It is not the full alpha/beta broadcast model.
- Fundamentals of Astrodynamics and Applications (David A. Vallado): Standard reference for two-body, Lambert, maneuvers, and J2. Equations implemented independently in SIDUS.
How do AI agents use this tool?
Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.