Trimble Technologies Floodlight Shadow Reduction What is Satellite Shadow? Satellite shadow occurs when an obstacle between a GNSS satellite and a receiver stops the receiver from tracking the satellite effectively. As more satellites are blocked from view, it becomes progressively more difficult for the receiver to compute accurate positions. In extreme cases there are simply too few satellites in view to compute positions at all.
Trimble Technologies Floodlight How Does Floodlight Technology Mitigate Satellite Shadow?• By combining GPS and GLONASS tracking, satellite availability is increased by up to 60% over GPS-only positioning.• Advanced tracking algorithms speed up signal acquisition and ensure more stable tracking of satellites with weakened signals. With steadier tracking comes smoother positioning that is less prone to drop-outs and spikes caused by erratic satellite tracking.• Floodlight technology uses altitude-constrained positioning to reduce the impact of weakened or blocked signals. This technique limits the impact of weak signals, allows 3D positioning with fewer satellites, and improves horizontal and vertical accuracy.Floodlight technology is compatible with real time and postprocessedworkflows. There is no extra configuration, back-office processing, orquality control required—it just works.
Trimble Technologies Floodlight Shadow Reduction Without Floodlight Notice how it effects your horizontal with the jumbled (longer) signal.
Trimble Technologies Floodlight Shadow Reduction With Floodlight Through advanced algorithms, it chooses the picks the only the satellites that fall within the horizontal range.
Trimble Technologies FloodlightWhy is Floodlight Technology Better Than Other Techniques To Improve Position Availability?Receivers that address satellite shadow by offeringGPS and GLONASS positioning are only solving part ofthe problem.Other solutions that use lower quality thresholds mayincrease position yield in obstructed conditions, butdo so at the expense of accuracy. Floodlighttechnology tackles satellite shadow by improvingsatellite visibility and tracking while safeguardingagainst the effects of weak satellite signals on positionquality— achieving the best possible position.
Trimble Technologies Floodlight Shadow Reduction – Urban Areas The next slides represent actual GPS data taken in this urban area.
Trimble Technologies Floodlight – Urban Area Comparison Juno Series
Trimble Technologies Floodlight – Urban Area Comparison GeoExplorer 2008
Trimble Technologies Floodlight – Urban Area Comparison GeoExplorer 6000 Series Notice anything different?!!
Trimble Technologies Floodlight Comparison • 80% more 10 cm - 30 cm precision positions than the previous edition GeoExplorer 2008 (and that is still a great handheld device). GeoXH 6000 series with Floodlight GeoXH 2008 series Juno series0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 10 cm or less 10cm to 30cm 30cm to 100cm 100cm to 300cm 300cm to 500cm More than 500cm
Trimble Technologies Floodlight – Hillside Canopy ComparisonThe images below show performance before and after the introduction of Floodlight Technology. In both cases thered shows the results of positioning with a GeoExplorer® 2008 series handheld that does not include Floodlighttechnology. The yellow shows the same routes measured with a GeoExplorer 6000 series handheld with Floodlighttechnology enabled. Postprocessed data collection in a dense canopy environment. Actual Collected Data Notice all the areas where no points were collected with the GeoExplorer 2008 (red) because of signal loss.
Trimble Technologies Floodlight Shadow Reduction BETTER ACCURACY AND MORE POSITIONS IN DIFFICULT ENVIRONMENTS Increase satellite availability Multi-constellation positioning Stabilize acquisition and tracking Advanced tracking algorithms and filters Improve accuracy and limit position outages Altitude-constrained positioning* Standard on GeoXH, available as an optional upgrade on GeoXT