Present and Future Global Navigation Satellite Systems (GNSS)

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Standard GNSS Point Positioning Algorithm Wanted (4 unknown parameters): • receiver position (x,y,z) • receiver clock error (dt) Satellite Can be computed from: 1. Measured pseudo-ranges on L1 *) e s r Receiver 2. Broadcast ephemeredes (data message) x r satellite position and clock error ionospheric delay (for L1) Earth 3. Tropospheric delay model *) We can only measure the distance to a satellite, not the 3-D vector! x s p s r c dt r 4 We need 4 or more satellites, more satellites is better (redundancy)! Least Squares Adjustment GEO2TECDI – Bangkok, May, 2009 – GNSS Lecture 2
Global Navigation Satellite Systems GPS GLONASS Space Based Augmentation Systems: WAAS, EGNOS, MSAS, GAGAN, SDCM GALILEO IRNSS COMPASS QZSS 5 GEO2TECDI – Bangkok, May, 2009 – GNSS Lecture 2
Page 1 and 2: Present and Future Global Navigatio
Page 3: Principle of Satellite navigation S
Page 7 and 8: NAVSTAR GPS Block II Satellite sola
Page 9 and 10: GPS Satellite Ground Tracks 90 60 3
Page 11 and 12: 80 60 40 20 0 270 −20 −40 −60
Page 13 and 14: GPS Signal Components • All signa
Page 15 and 16: Examples of GPS Receivers PC card m
Page 17 and 18: RINEX: Receiver INdependent EXchang
Page 19 and 20: Selective Availability (SA) - 1990-
Page 21 and 22: GPS Services SPS/SA: SPS PPS Standa
Page 23 and 24: GPS PRN 23 Anomaly, 1 Jan, 2004 500
Page 25 and 26: Modernized Signal Evolution Present
Page 27 and 28: GEO2TECDI - Bangkok, May, 2009 - GN
Page 29 and 30: Introduction to Glonass GLONASS Rus
Page 31 and 32: GEO2TECDI - Bangkok, May, 2009 - GN
Page 33 and 34: GLONASS signal structure (2) Differ
Page 35 and 36: The 4 GALILEO arguments - European
Page 37 and 38: Galileo added value • Under contr
Page 39 and 40: GALILEO In Flight Configuration Nav
Page 41 and 42: GPS versus Galileo GPS Satellites:
Page 43 and 44: COMPASS 43 GEO2TECDI - Bangkok, May
Page 45: QZSS 45 GEO2TECDI - Bangkok, May, 2

Present and Future Global Navigation Satellite Systems (GNSS)

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