CUAV C-RTK 9Ps
Series: CUAV RTK GNSS modules for drones
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The CUAV C-RTK 9Ps is a compact RTK module based on the u-blox ZED-F9P for medium-class multicopters. Chinese maker CUAV intends it both as a rover on the aircraft and as a base station on the ground; two units together allow heading from GPS.
The receiver uses two bands (L1 and L2) and handles GPS, GLONASS, Galileo, BeiDou and QZSS. For RTK CUAV states 0.01 m + 1 ppm as CEP, the radius containing half of the measurements; without corrections it is 1.5 m, with SBAS 1.0 m. 1 ppm is 1 mm per kilometre of distance from the base. The output rate is 20 Hz and the compass is an IST8310. Connection is through two UARTs and USB, the antenna sits on an MMCX socket, and NMEA, UBX and RTCM 3.x are spoken. The module weighs 30 g, antenna not included.
The appeal of the device is that rover and base can be the same model: the base stands on a surveyed point and sends RTCM corrections, and the rover on the aircraft evaluates them in real time. Two modules on the aircraft give heading without a magnetic compass. By CUAV's own statement post-processing (PPK) is not supported, so anyone wanting to georeference aerial images without ground control points needs a stable correction link during flight. The EU classes apply to the aircraft: from C1 upward geo-awareness and remote ID are mandatory, and both rest on the GNSS position.
The MMCX socket is small and delicate; frequent plugging and pull on the cable damage it, and strain relief on the frame extends its life. The antenna needs a clear view and distance from transmitters, and the radio link to the base must cover the area of operation. Before take-off one waits for fix, not float, and the compass is calibrated after installation.
Technical data
Other data
| Chipset | u-blox ZED-F9Pcorrect |
|---|---|
| Compass | IST8310correct |
| Constellations | ['GPS', 'GLONASS', 'Galileo', 'BeiDou', 'QZSS']correct |
| Frequency bands | L1/L2: GPS L1C/A L2C, GLONASS L1OF L2OF, Galileo E1B/C E5b, BeiDou B1I B2I, QZSS L1C/A L2Ccorrect |
| Horizontal accuracy (cm) | 1correct |
| Interfaces | 2x UART, USB; MMCX-Antenne; NMEA, UBX, RTCM 3.xcorrect |
| RTK capable | yescorrect |
| Update rate (Hz) | 20correct |
| Weight (g) | 30correct |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
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