14. GNSS Survey
The chapter focuses on the Global Navigation Satellite System (GNSS), its components, working principles, various surveying techniques, and applications in civil engineering. It highlights GNSS's advantages and limitations, future trends, legal frameworks in India, and the integration of GNSS with other technologies. Lastly, it discusses career and research prospects in GNSS for civil engineers.
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What we have learnt
- GNSS encompasses satellite systems like GPS, GLONASS, Galileo, BeiDou, NavIC, and QZSS for global positioning.
- GNSS consists of three segments: space (satellites), control (ground control stations), and user (receivers).
- Various GNSS surveying techniques, such as static, kinematic, and differential GNSS, are utilized based on accuracy requirements.
Key Concepts
- -- Trilateration
- The process used by GNSS to determine location based on distances from multiple satellites.
- -- Differential GNSS
- A method using corrections from a base station to improve the accuracy of GNSS positioning.
- -- RTK (RealTime Kinematic)
- A technique enabling centimeter-level accuracy in GNSS by using real-time corrections.
- -- Multipath Effects
- Errors arising from GNSS signals reflecting off surfaces like buildings or water bodies.
- -- NavIC
- India's indigenous navigation system, being integrated into civil engineering projects.
Additional Learning Materials
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