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How will all the new GNSS signals help RTK surveyors

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How will all the new GNSS signals help RTK surveyors

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    2. School of Surveying and Spatial Information Systems How will all the new GNSS signals help RTK surveyors?

    3. What is GNSS? Global Navigation Satellite Systems

    4. Signals from space

    8. The Systems

    9. L5 Has a code on it which spreads the bandwidth wider. The advantages of L5 are that multipath and noise are reduced. Having two codes (ie L1 & L5) allows computation of the ionosphere. It is also a stronger signal which allows better reception under tress and possibly indoors too. AGD did some research with students and found about a 7 – 10 db loss under trees which is approx the gain for the new signal. L5 is more robust which means that users are less likely to lose lock L1C is designed to be compatible with GalileoL5 Has a code on it which spreads the bandwidth wider. The advantages of L5 are that multipath and noise are reduced. Having two codes (ie L1 & L5) allows computation of the ionosphere. It is also a stronger signal which allows better reception under tress and possibly indoors too. AGD did some research with students and found about a 7 – 10 db loss under trees which is approx the gain for the new signal. L5 is more robust which means that users are less likely to lose lock L1C is designed to be compatible with Galileo

    10. Russia’s GLONASS Similar to GPS, originally developed by the USSR (now Russian Federation). Also military controlled. GPS is CDMA-based (ie uses codes to distinguish sats), GLONASS is FDMA (ie uses frequency to distinguish sats). Fully operational in 1996, and now (Nov11) back to 24 functioning satellites. The first GLONASS-K satellite was launched in Feb 2011 transmitting a new CDMA signal called L3 (1202.025 MHz) as well as the legacy FDMA signals There is also talk of a Glonass L5 signal but nothing concrete. Not decided where it will go. Also Glonass will go to a CDMA system maybe in 2011.There is also talk of a Glonass L5 signal but nothing concrete. Not decided where it will go. Also Glonass will go to a CDMA system maybe in 2011.

    11. Compatibility & Interoperability

    12. Europe’s Galileo

    13. China’s Compass

    14. Quasi-Zenith Satellite System

    15. Satellite Based Augmentation Systems metre – decimetre level

    18. Precise Point Positioning?

    19. Combinations of Signals – GPS only

    20. Combinations of Signals

    22. Triple Frequency GPS?

    23. For new Receiver designers

    24. Impact for the RTK Surveyor

    25. Impact for the RTK Surveyor

    26. Conclusions

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