How to achieve best accuracy with WingtraOne PPK. Why is it better than RTK (e.g. Ebee Plus)
The WingtraOne PPK workflow is generic to all conventional GNSS base stations (i.e. the same you are using for RTK). The accuracy of WingtraOne PPK is at least as good as eBee RTK, thanks to the combination of our best-in-market PPK modules onboard and the 42MP pixel RX1 camera that achieves better resolution than other fixed wings like eBee. Comparing the two technologies RTK and PPK it is worth mentioning that RTK will never be better than PPK - in best case, where you never loose the link between base station and drone, RTK achieves the same accuracy as PPK, otherwise PPK accuracy is significantly better, which is why also eBee RTK uses PPK as fallback in this situation.
For WingtraOne PPK, you can use your own GNSS base station or use subscription to a CORS or VRS network. For the US, Opus is the most frequently used CORS network (see this map for the positioning accuracy you can expect).
If you work with CORS or VRS network data, you do not have to care about PPK during flight. Simply perform your flights and both, the images and the PPK logs are saved on the SD card within the camera. After your flights, you use the WingtraHub Application on a Windows computer to assign the position information to the images. You have to insert the SD card of the camera and manually add the RINEX file, which you downloaded from the CORS server, and the position of the used base station in WGS84.
If you work with your own base station, place the base station once you arrive on the field and start logging a RINEX file. Make sure you know the exact location of the base station in WGS84 (if the base station is in RTK mode it will localize with sub-centimeter accuracy itself, if it is in stand-alone mode place it on top of a known reference point). Make sure the base station is recording without interruption from takeoff of the first flight until landing of the last flight. After your flights, you use the WingtraHub Application on a Windows computer to assign the position information to the images. You have to insert the SD card of the camera and manually add the RINEX file of your base station and the position of the base station in WGS84.
In either option there is no need for GCPs to achieve sub-5cm accuracy. Many customers are using 1-5 GCPs none-the-less for verification and proving the accuracy to their clients.