GLOBAL NAVIGATION SATELLITE SYSTEM
- December 9, 2020
- Posted by: OptimizeIAS Team
- Category: DPN Topics
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Subject: Science & tech
Concept:
- Global Navigation Satellite System (GNSS) refers to a constellation of satellites providing signals from space that transmit positioning and timing data to GNSS receivers. The receivers then use this data to determine location.
- By definition, GNSS provides global coverage. Examples of GNSS include Europe’s Galileo, the USA’s NAVSTAR Global Positioning System (GPS), Russia’s GLONASS)and China’s BeiDou Navigation Satellite System and India ‘s IRNSS – NAVIC.
The performance of GNSS is assessed using four criteria:
- Accuracy: the difference between a receiver’s measured and real position, speed or time;
- Integrity: a system’s capacity to provide a threshold of confidence and, in the event of an anomaly in the positioning data, an alarm;
- Continuity: a system’s ability to function without interruption;
- Availability: the percentage of time a signal fulfils the above accuracy, integrity and continuity criteria.