1 / 11

Galileo EU/ESA

Global Navigation Satellite Systems GNSS Accuracy 10m or better. Galileo EU/ESA. GPS USA. Planned India, Japan, Korea. GLONASS Russia. Compass China. Space Based Augmentation Systems Improves GNSS accuracy to 3 metres. GNSS Errors.

chogan
Download Presentation

Galileo EU/ESA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Global Navigation Satellite Systems GNSS Accuracy 10m or better Galileo EU/ESA GPS USA Planned India, Japan, Korea GLONASS Russia Compass China

  2. Space Based Augmentation Systems Improves GNSS accuracy to 3 metres

  3. GNSS Errors Ionospheric & Tropospheric diffraction 10 + 1 metres Canyon Effect – 1 metre Part copied from http://www.kowoma.de/en/gps/errors.htm Timimg errors 4m – Rounding errors 1m Geometry up to 100m Orbits up to 5m

  4. Ionospheric effects ± 5 metres Shifts in the satellite orbits ± 2.5 metres Clock errors of the satellites' clocks ± 2 metres Multipath effect ± 1 metre Tropospheric effects ± 0.5 metre Calculation & rounding errors ± 1 metre All adds up to +- 15m – 10m typically stated With EGNOS still +-3 to 5m according to this source However +- 1m considered realistic

  5. R1 Ephemeris – Actual Position of the Satellite Time – determines how far away we are R1 Geometry locates us anywhere on the surface of a sphere

  6. R2 R1 Ephemeris – Actual Position of the Satellite Time – determines how far away we are R1 Geometry locates us anywhere on the surface of a sphere Intersect 2 Spheres gives a ring

  7. R2 R1 R3 Ephemeris – Actual Position of the Satellite Time – determines how far away we are R1 Geometry locates us anywhere on the surface of a sphere Intersect 2 Spheres gives a ring Intersect 3 Spheres gives 2 points 4 spheres gives a 3D position

  8. CODE DIVISION MULITPLE ACCESS – CDMA SPREAD SPECTRUM GNSS DATA + TRANSMISSION SPREADING CODE CORRELATOR RECEPTION DATA OR PRN

  9. Cold Start – Load The Almanac – where are the satellites Warm start – get satellite data and extract Ephemeris (position) and time Calculate UTC Do Geometry and get a 3D fix Use SBAS to correct Fix Use Regression to get better accuracy ASSISTED GPS – this is a technique whereby another source of location data is used to enable the device to start seeking the most apprpriate satellites. E.G. CELL-ID, dead reckoning or just memeory

  10. Space Based Augmentation Systems Improves GNSS accuracy to 3 metres

  11. INTRODUCTION TO DATA OVER GSM ANALOGUE – e.g V22 etc SHORT MESSAGE SERVICE – SMS GPRS BASIC SMS COMMANDS AT+CMGS=”+447967123456” > ENTER TEXT CONTROL Z AT+CMGR=NN AT+CMGD=NN AT+CMGW=”+44796123456” > ENTER TEXT CONTROL Z AT+CMSS = NN

More Related