Get Started With PPK On Trinity F90
Getting Started
The Trinity F90+ PPK module (standard on all Trinity F90+ drones) enables high-precision mapping without the need for ground control maps. You can achieve centimetre-level precision through the relative comparison of Trinity F90+ raw measurements of satellite locations to the raw measurements recorded by a base station acting independently.
PPK Base Station
A base station on a fixed-position will record raw static data used to calculate positions of each flight image. The accuracy of the Trinity F90+ PPK data is dependent on a proper base station set-up and proper coordinates.
Base File Options
There are several different methods on how you can acquire the proper base files and location. A RINEX file will be required that covers the
full period of the flight. A RINEX2 or RINEX3 observation file (possible extensions *.obs, *.o, *.yyo, *.yyO) or a compressed Rinex file (possible extensions *.yyd and *.yyD) can be used. Please start the logging at least 10 minutes before to 10 minutes after the flight. Longer coverage is always preferred. For the logging interval, we recommend 1s. A WGS84 coordinate with ellipsoidal height will be required for the base position, so please ensure you have an accurately converted coordinate using an exact transformation.
General Base Station Requirements
- Logging interval of 10s or faster (1s is strongly recommended)
- Atleast two frequencies logged (more is recommended)
- RINEX2 or RINEX3 observation file
- Constellations received: GPS + GLONASS
- Base station positioned as close to the survey area as possible
Option 1: Use Own Survey-Grade GNSS Antenna
As soon as you arrive on site, place your GNSS antenna in an open area (away from buildings, mountains, trees, etc.) to get optimal satellite coverage. If it is on a known point, make sure to save the coordinate and measure antenna height. If it is on an unknown coordinate, measure antenna height and process the antenna location through NRCAN. Start logging the base antenna at least 10 minutes before the flight and 10 minutes after. It is strongly recommended to start recording as soon as you arrive on site to maximize time. If you are recording in a propietary format (Trimble .t00, leica .m00, Septentrio .sbf, etc.) please convert to RINEX.
Option 2: Use CORS or VRS Network
In many parts of the world, Continuously Operating Reference Station networks exist that have fixed base stations in which you can pay to access. You can download base files and locations from these. These base files are usually given in a local coordinate system and must be covered to WGS84 with ellipsoidal height.
Option 3: Autodetect Reference Position
By selecting "Autodetect the Reference Position", the position of your base location will be automatically calculated based on the reference file. For high-precision work, this is not recommended.
Option 4: Remote Reference Station Select
In QBase3D, it is possible to choose a reference station from publicly available networks. Simply select "Get Closest" to automatically download data from the closest available reference station. Please note that remote reference data is usually not available until a few hours after the flight. This option may not be as accessible in certain regions with privatized networks.
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