Frequently Asked Questions
  • Is it absolutely necessary to have two boards, one rover and one base?
The RTK technology requires a stationnary receiver to allow exact calculation of the rover module. To achieve this, you need two receivers, one to act as the base module, and another as the rover module, whatever the use-case is.
  • Do the Drotek F9P modules have built-in batteries? Do they need an external power supply?
The DP0601 module, as well as the Sirius F9P Rover do not have built-in batteries. This means you have to supply power to these boards in order to have them working. You can supply them with power from USB port (excepted for the Sirius RTK module which doesn't have one), for instance with a power bank for smartphones or a computer. The necessary power supply is 5V so make sure to not oversupply them.
  • Are the Drotek F9P RTK modules compatible with other brands telemetry kits?
The Drotek F9P RTK modules are compatible with most telemetry kits. In fact, they are compatible with approximately any device that has a serial port using the UART protocol.
  • Can the F9P modules be used without an autopilot?
The use of an autopilot is not obligatory, even though some of the modules are built specifically for this purpose. Using an autopilot provides a MAVLink in which can be encapsulated the RTK data, and an automatic process that will configure the modules almost entirely automatically. Using the RTK modules without an autopilot will require you to configure the modules in order to be able to communicate with the telemetry boards correctly. You can find more on configuring the F9P RTK modules by following this link.
  • What's the most efficient Survey-in time? How long does it take to reach 1 m accuracy? 50 cm accuracy? 10 cm accuracy?
There is no best survey-in time, as its duration will mainly depend on what accuracy you want to reach. This setting can be set up with either Mission Planner or QGroundControl, as well as the U-Center software in case you don't use an autopilot. Keep in mind that having an efficient survey-in will require having the base set in the most building-free space and a clear sky-view. The time necessary to reach a 1-meter accuracy for the base positioning is approximately 10 minutes. Reaching 50 cm and below accuracy will require a much longer period of time, roughly an hour, or more.
In order to get the most accurate position for your base, you can use known reference locations in order to have an accurate position. You should be able to find such places by looking for your national geodesy institute (i.e. it is the IGN for France). For the USA for instance, you should find informations following this link.
  • Can multiple rover modules be used with a single base module?
In order to use multiple rover modules with a single base, you have to choose between using a special telemetry firmware that will allow multipoint communication (more informations can be found here), or using the TCP/IP protocol to stream the RTK data from the base module. You can find more informations on the configuring of the Ublox chip and its TCP/IP features by following this link.
  • Is it possible to have multiple bases to increase accuracy?
It is virtually impossible to use multiple base modules for a normal RTK setup, as it would not increase the accuracy, and require a much more complex setup.
  • Are Drotek F9P modules compatible with other brands RTK modules? (i.e. Drotek rover module with other brand base module)
It is possible to use a Drotek receiver as the rover module, and another brand's RTK receiver as the base module, but this requires to make sure that the data received by the Drotek RTK module contains RTCM 3 messages.
  • How to install the firmware completely in case of failure or bricked F9P GNSS module?
Sometimes the ublox chip doesn't completely support Windows 10, we must continuously attempt to upload the firmware until the upload is successful. Parameters that needs to be followed: Go to u-center 20.10 >> Tools > Firmware update
Firmware image - UBX_F9_100_HPG_113_ZED_F9P.7e6e899c5597acddf2f5f2f70fdf5fbe > ublox Firmware update 1.13 Baudrate - 57600 to load and the file Send training sequence - must be selected In case you are trying to recover a bricked GNSS F9P module, you can follow the following configurations. Then initiate the update individually with the following selections: Use chip erase - 460800 bps
Enter safeboot before update - 115200 bps
Once most of the update is completed, it ensures the recovery of the GNSS module.
  • Error with "USB not recognised" - Operating system being Windows 10
Normally, this issue arises if the USB is unable to power and transfer data at the same time and secondly, if the Ublox Drivers are not compatible with Windows 10.
Following steps will provide the solution:
1. Rebooting the computer and reinstalling the u-center software
Restart the computer and try connecting the USB device again. If not disconnect the USB device, then uninstall the device software. After the name of the device is removed, remove the device from the computer and restart the computer. Then reinstall the software.
2. Search for the specific driver in the device manager
Search on the computer for the ublox driver on Task Manager, then select on the ublox driver and use the update driver option, and that could work. USB Drivers using Device manager:
Press Ctrl + Alt + Delete at the same time - Select Device Manager from the list - Find Universal Serial Bus controllers and expand the list - Right-click Unknown Device - Select Properties - Select Drivers - Click Update Driver - Close Device Manager - Restart your PC
  • How to configure a GNSS module with the Moving base configuration?
You can configure the module with MSM7 RTCM messages instead of the MSM4 RTCM messages. The 1005 RTCM message is not required since it is solely for stationary use (standalone base station). This configuration will deliver the relative position of the rover with centimeter-level accuracy. Also, ensure that the moving base station is not surveyed-In. It only requires the relevant RTCM changes in the u-center configuration.
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