GAGAN: India's Indigenous Satellite-Based Aviation Navigation System
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Why in News
- Civil aviation authorities successfully tested India's first satellite-assisted aircraft approach on a commercial jet using **GAGAN** technology.
About GAGAN
- GAGAN, short for **GPS Aided GEO Augmented Navigation**, is an indigenous **Satellite-Based Augmentation System (SBAS)**.
- The system was jointly built by **ISRO** and the **Airports Authority of India (AAI)** and has been functional since **2015**.
Need for GAGAN
- Standard **GPS** signals often face atmospheric disturbances, making them unreliable for precise flight maneuvers.
- GAGAN corrects signal errors in real time and alerts pilots whenever underlying positioning data becomes untrustworthy.
Key Features
- The system boosts positioning accuracy, checks signal reliability constantly, and guides planes during difficult landings.
- It complies with global aviation safety norms and is the first **SBAS** certified specifically for the equatorial zone.
System Architecture
- The ground setup includes **15 Indian Reference Stations (INRES)**, **2 Indian Master Control Centres (INMCC)**, and **3 Indian Land Uplink Stations (INLUS)**.
- The operational framework relies on **4** core communication networks alongside **3** geostationary satellites, namely **GSAT-8**, **GSAT-10**, and **GSAT-15**.
Key Applications
- Apart from aviation, GAGAN aids marine travel, road transport, railway tracking, disaster relief, defense ops, telecom networks, and land surveying.
Significance
- This system places India alongside elite regions like the **USA**, **Europe**, and **Japan** that operate their own **SBAS** networks.
- It works seamlessly with global networks such as **WAAS** in the **USA**, **EGNOS** in **Europe**, and **MSAS** in **Japan**.
Difference Between GAGAN and NavIC
- GAGAN corrects existing **GPS** data to guide planes safely, while **NavIC** is an independent satellite navigation network covering India and areas up to **1,500 km** beyond its borders.