satellite navigation

Amap Tech

Oct 30, 2020 · Fundamentals

Principles, Applications, and Future of Satellite Positioning (GNSS)

The article explains GNSS fundamentals—time‑signal ranging, ephemeris, and error sources—traces the evolution from early systems to modern constellations like Beidou, describes receiver components and mobile‑phone limitations, compares iOS and Android raw data access, and outlines future advances such as LEO constellations, RTK integration, and expanding precision‑positioning applications.

BeidouGNSSLocation Accuracy

0 likes · 21 min read

Principles, Applications, and Future of Satellite Positioning (GNSS)

Baidu Maps Tech Team

Nov 16, 2016 · Fundamentals

Why High‑Precision GPS Still Struggles in Urban Canyons and Tunnels

This article examines the principles of differential satellite positioning, the technical and environmental challenges that prevent centimeter‑level accuracy in dense urban areas, bridges, and tunnels, and explores practical workarounds and future visions for truly high‑precision navigation.

Differential PositioningGPSHigh Precision Navigation

0 likes · 18 min read

Why High‑Precision GPS Still Struggles in Urban Canyons and Tunnels

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.

A-GPSGNSSGPS

0 likes · 17 min read

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