![]() Some receivers, like Trimble, may use their own proprietary data format (T01 Files) which can later be converted to RINEX files using a conversion utility. RINEX stands for 'Receiver Independent Exchange Format' and is widely used in PPK applications. This information is stored into a RINEX or proprietary file format. In this scenario we still record our inaccurate positions, but we use our GNSS receiver to obtain satellite observations like satellite ID, frequency (L1/L2/L5 etc), constellation, pseudo-range, carrier-phase, Doppler and signal-to-noise ratios. This is where PPK can provide a solution. However, in cases where it is not possible to have an Internet or cellular connection (for instance when surveying in a remote area), you won't have access to this real-time correction data, thus not being able to send accurate position data to the acquisition software. Since the position data is already processed in real-time, there is no need to record any data on your GNSS receiver. As soon as your GNSS receiver starts applying this correction data to the calculated positions, it will report that the calculated position is "RTK-FIXED" and outputs the sub-centimeter accurate positions to your software as NMEA0183 sentences. This data can be received via an UHF radio link, Internet connection (NTRIP) or a cellular modem. When using RTK (Real Time Kinematic), the correction data is processes in real-time. Before you can import this data, we will explain in the following paragraphs how PPK works and what steps needs to be taken to get to a PPK correction file which can be used in Hydromagic. This functionality can be found under the miscellaneous tools window in the Sounding Generation Wizard. Since version 9.0, Hydromagic offers functionality to merge your survey data with PPK correction files to get a sub-centimeter accurate bathymetric survey. This might be useful, for example when you are surveying at a remote area without cellular coverage to get your RTCM correction data in. In cases where you need sub-centimeter accuracy, and you do not have direct access to a RTK base station, you can use PPK (Post Processing Kinematic) to (post)process your position data with base station observation data. How to perform a PPK survey using Hydromagic ![]()
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March 2023
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