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#Hypack delete portion of raw data series
allows for the Direct Georeferencing of a sample MBES data series in agreement with the equivalent ASB solution to better than 0.10 m, with the majority agreeing to better than 0.05.is available 1 hour after data collection,.provides a convergence-free solution by combining the forward and backward solutions,.does not need local reference stations,.has been shown to match the North, East and Down position computed using the ASB (Applanix SmartBase) network Carrier Phase DGNSS processing for 15 POS MV data sets to an accuracy of 0.019m, 0.021 m and 0.049 m RMS respectively, which is sufficient to meet the accuracy requirements for a majority of mapping applications,.POSPac MMS using PP-RTX aided-inertial technology: An rms surface derived from each SBET is shown below.ĭifferencing the two surfaces confirms the level of agreement, with no differences greater than 10 cm, and the majority less than 5 cm. Both the ASB and PP-RTX SBET solutions were applied to the bathymetry, and the results compared. The maximum difference in horizontal is approximately 0.04 m in horizontal, and about 0.07 m in vertical. A comparison was then done between the ASB solution and that from PP-RTX. The Applanix SmartBase (ASB) technology allows the computation of a centimetric-accurate position solution, with distances to the nearest reference station on the order of 20-60 km.
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The data was collected in the Thames Estuary, where Ordnance Survey OSNet GNSS reference stations provide the data necessary to compute a SmartBase post-processed VRS network. Hypack™ was used for data acquisition, and Fledermaus™ has been used for the visualization of some results. Maplin is equipped with a POS MV™ OceanMaster GNSS-aided inertial navigation system for georeferencing the R2Sonic™ 2024 multibeam sonar. More recently, a new data set was collected by the Port of London Hydrographic Service on their vessel Maplin. Performance analysis of 14 different datasets from various locations around the world was done by comparing the PP-RTX solution to that from SmartBase. In turn, this improves availability and accuracy. In the context of a comparison to real-time PPP services, archiving the data on the internet ensures more robust and reliable access to the correction data. This ensures a fast turnaround of the solution, previously unavailable for post-processed PPP services. Robust Acquisition of Correction DataĪs noted previously, the PP-RTX data is available within minutes of real-time. Applanix’ industry-leading POSPac MMS GNSS Inertial software, and in particular the Applanix SmartBase (ASB) post- processed virtual reference station technique, has been widely adopted as a robust and reliable method of Direct Georeferencing multibeam data.Ī global network of approximately 100 stations tracking GPS, GLONASS, BDS, QZSS and Galileo provides the raw data for analysis and processing to produce the PP-RTX corrections, which are then made available via the internet within minutes of real-time.Ĭompared to real-time PPP services, the PP-RTX post- processed approach provides a number of advantages: Almost no Convergence Timeīy processing the data in both the forward and backward direction, the already converged solution from the forward pass may be used as a “seed” for the backward direction.
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RTX is Trimble’s approach to PPP with advanced ambiguity resolution, providing its own ephemeris correction service, leading to integer-level ambiguities for accuracy approaching that of RTK. This new method integrates Trimble CenterPoint® RTX technology into POSPac MMS. New in POSPac MMS 8.0 is a unique PP-RTX™ GNSS aided-inertial module that provides centimetre-level post-processed positioning accuracies without the use of local reference stations. Applanix’ industry leading POSPac MMS GNSS Inertial software, and in particular the Applanix SmartBase (ASB) post-processed virtual reference station technique, has been widely adopted as a robust and reliable method of Direct Georeferencing multibeam data.