Trimble’s new post processing engine uses the latest GNSS technologies enabling existing users to utilize better product performance with their existing Trimble devices. According to Trimble, “The new Trimble® DeltaPhase™ technology provides considerable improvement in code postprocessing accuracy in all environments. Users can expect postprocessed accuracy of 1 to 3 meters with the Trimble Juno™ SB and Juno SC handhelds and submeter to 50 cm postprocessed accuracy with the GeoXT™ handheld from the GeoExplorer 2008 series and the GPS Pathfinder® ProXT receiver.
The following chart compares the accuracies of the old (red) and new (green) postprocessing engine for the GeoXT handheld with the internal antenna from 26 points from Trimble’s Test Site 2 (suburban) environment. The base station is within 10 km.
The following chart compares the accuracies of the old (red) and new (green) postprocessing engine for the Juno SB handheld with the internal antenna from 26 points from Trimble’s Test Site 2 (suburban) environment. The base station is within 10 km.
Traditional data collection software used fixed masks (satellite elevation level, SNR values, PDOP,etc.) to determine which GPS satellite signals to shield. Although this insured that most poor signals were rejected, it also caused many perfectly usable signals to be ignored. Because the new Trimble postprocessing engine achieves better results when it is connected to more GPS measurements, the new default GPS slider is now set to Productivity. 
According to Trimble’s latest “White Paper” article titled, “Trimble Mapping & GIS Products: New Postprocessing Enginge,” the “new settings ensure optimal postprocessed accuracy due to the engine’s ability to select and use the GPS satellite measurements.” Simply put, a new and improved GPS satellite selection application will allow you to produce better results by connecting to more satellites.
Position yield potential is also greatly increased around environments such as Trimble’s Test Site 2 (typical) and Test Site 3 (extreme) where obstacles could effect postprocessed data accuracy. According to Trimble, yield in a suburban (Test Site 2) area can increase by 20% and over 40% in a forested environment (Test Site 3).
Before Trimble released the test results for their new postprocessing engine, they allowed us to see their three “test sites.” Trimble uses three, very different, testing sites to research receivers under two extreme environments and one “typical” environment. Each test site contains 26 carefully planned survey locati0ns offering different test and research results within each test area.
Test Site One is an ideal open environment with zero obsticles. The GPS antennas are mounted on stationary survey pillars. The test lab shows how performance is improved without other variables to consider. Because of its ideal environment, most receivers greatly exceed their specifications.
Test Site Two is a suburban industrial area down a two way street surrounded with one to two story buildings, parking, and street signage. Mature trees are scattered across one side of the street and are sparsely planted on the other. The 26 test locations are actual utility and city asset features including; telecom cable boxes, electrical transformers, fire hydrants, street lights, boundary begs, etc. Trimble uses Test Site Two to validate GPS receiver specifications because it most closely resembles the working environment of a “typical” user.
Test Site Three is a heavily forested environment with densely planted forestry. Trimble tests the performance and yield results of some of the most demanding conditions around. The tree canopy hardly allows sunlight to pass to the forest floor. Tests are conducted along the forest roads to provide “truth points.” Testing is also conducted within the forest to measure yield and accuracy.
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