1 / 12

Using GNSS around Vegetation and Urban Canyons- Best Practice Guide

Using GNSS around Vegetation and Urban Canyons- Best Practice Guide. Presenter Warren Eade – GeoSystems NZ Ltd. Using GNSS around Vegetation and Urban Canyons. Using GNSS around Vegetation and Urban Canyons. What’s the Issues? If GNSS Positions are based on Time, then

posy
Download Presentation

Using GNSS around Vegetation and Urban Canyons- Best Practice Guide

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. Using GNSS around Vegetation and Urban Canyons- Best Practice Guide Presenter Warren Eade – GeoSystems NZ Ltd

  2. Using GNSS around Vegetation and Urban Canyons

  3. Using GNSS around Vegetation and Urban Canyons What’s the Issues? If GNSS Positions are based on Time, then • Anything that blocks signal • Anything that interferes with signal propagation Is unwanted and causes errors

  4. Using GNSS around Vegetation and Urban Canyons How so? • So anything that interferes with the direct path causes a timing delay • Signal the bounces off other objects also have a time shift causing error

  5. Example- Juno SB Juno Needs 1 min to warm up filter Pause both ends Backward Forward Combined

  6. Canopy Example – GeoXH 2008/ Zephyr Result pre and post canopy better. Note 4 position missing Backward Forward Combined

  7. Using GNSS around Vegetation and Urban Canyons While all these units are manufactured by Trimble they are all quite different! 3-5m Post processed accuracy 1cm

  8. Trimble FloodlightSatellite Shadow Reduction Technology Increase satellite availability Multi-constellation positioning Stabilise acquisition and tracking Advanced trackingalgorithms and filters Improve accuracy and limit position outages Altitude-constrained positioning * Standard on GeoXH, available as an optional upgrade on GeoXT

  9. Trimble FloodlightSatellite Shadow Reduction Technology

  10. Trimble FloodlightSatellite Shadow Reduction Technology

  11. Using GNSS around Vegetation and Urban Canyons • Use planning tools • Understand your environment • Know how your system works • Follow best practise guidelines

  12. Using GNSS around Vegetation and Urban Canyons Best Practice • Turn GNSS receiver on 3min before work • Avoid blocking antenna • Never point receiver towards the ground • Log 30sec of data for point features (There are exceptions, see below) • Mount receiver to a pole if accuracy is required • Consider offsets and vertex Exception • Around multipath areas, 5sec point feature

More Related