3. Signals of GNSS
This chapter discusses the Global Navigation Satellite Systems (GNSS) and their operational principles, highlighting the various signals transmitted by satellites, the advantages and disadvantages of GNSS technology, and the types of GNSS receivers available. The chapter explores surveying techniques using GNSS, including static, kinematic, and real-time kinematic methods, along with their respective pros and cons. Additionally, the role of augmentation systems like WAAS and MSAS in enhancing GNSS accuracy is outlined.
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3.4.9Other Satellite-Based Augmentation Systems (Sbas)
What we have learnt
- GNSS operates using various signals (L1, L2, L5) to provide navigation data.
- Different types of GNSS receivers are suitable for various applications such as navigation, surveying, and geodesy.
- The positioning accuracy of GNSS depends on multiple factors including satellite visibility, and the use of correction techniques can significantly improve precision.
Key Concepts
- -- Pseudo Random Code (PRC)
- A random sequence sent from GNSS satellites, allowing synchronization between satellites and receivers.
- -- Trilateration
- The method used by GNSS receivers to calculate their position based on the distances from three or more satellites.
- -- Differential GNSS (DGNSS)
- Technique using corrections from a stationary reference station to improve the accuracy of GNSS measurements.
- -- RealTime Kinematic (RTK)
- A surveying method that provides high-precision positioning in real-time using carrier phase measurements.
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