Baidu Maps Tech Team

May 4, 2016 · Fundamentals

Why Does GPS Take So Long to Lock? Uncovering the Secrets of Satellite Positioning

This article explains the fundamentals of GPS/GNSS positioning, why a cold start can take up to 30 seconds, how multiple satellite constellations like BeiDou work together, the causes of urban positioning errors, and techniques such as A‑GPS and sensor fusion that aim to improve accuracy.