In inertial navigation (INS), geodetic refers to positioning and reference systems based on Earth’s shape and gravity field. Geodetic coordinates are commonly used in GNSS-aided INS to provide accurate global positioning, mapping, and navigation.
Key Geodetic Concepts in INS/GNSS
Geodetic Coordinate System – Uses latitude, longitude, and altitude (Lat/Lon/Alt) based on the Earth’s reference model (e.g., WGS84).
Geodetic Datum – A standard reference for Earth’s surface measurements (e.g., WGS84, NAD83, ETRS89).
Geoid & Ellipsoid Models –
• Geoid: Represents mean sea level (used for altitude corrections).
• Ellipsoid: A simplified mathematical model of Earth’s shape (e.g., WGS84 ellipsoid).
How Geodetic Systems Enhance INS Accuracy
✔ Improves Positioning Accuracy – INS integrates with GNSS geodetic data to maintain high precision.
✔ Supports Global Navigation – Geodetic models help INS adapt to Earth’s curvature and gravity variations.
✔ Essential for Mapping & Surveying – Used in aerospace, military, marine, and autonomous navigation applications.
Challenges in Geodetic INS Navigation
✔ INS Position Drift – Without GNSS updates, INS-only navigation accumulates errors over time.
✔ Geoid Variations – Local gravity changes can affect altitude accuracy if not corrected.
