u-blox NEO-F9P
Series: u-blox RTK GNSS modules for drones
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The NEO-F9P from u-blox of Switzerland is a compact L1/L5 RTK module of the u-blox F9 family (12.2 x 16 x 3.6 mm) for industrial and drone applications in high volumes. It is not assigned to a drone class but is a building block that manufacturers fit into their own flight modules, for example in the Holybro H-RTK NEO-F9P and the CubePilot Here4.
The chip has 184 channels and handles GPS, GLONASS, Galileo, BeiDou, QZSS, SBAS and NavIC on the L1 and L5 bands, including GPS L1C/A and L5, Galileo E1-B/C and E5a, BeiDou B1I and B2a, QZSS L1C/A, L1S and L5, and NavIC L5. L5 is a newer signal with greater bandwidth, less prone to multipath effects. GLONASS stays limited to L1. For RTK u-blox states 0.01 m + 1 ppm as CEP, that is 1 cm at a radius containing half of the measurements, with a convergence time under 10 s. The rate is 20 Hz. Connection is through two UARTs, USB, SPI and I2C; NMEA, UBX, RTCM 3.3 and SPARTN 2.0 are spoken.
SPARTN is the correction format of PPP-RTK services, in which corrections come from a provider over the internet or by satellite instead of from a nearby base. A chip is not an aircraft: the duties of the EU drone regulation arise at the aircraft, where geo-awareness and remote identification (from class C1) rest on the GNSS position that such a receiver supplies. Classic RTK corrections come from your own base, a radio link or NTRIP.
For selection the build of the finished product decides, not the chip alone: antenna, ground plane, filtering and distance from transmitters determine what the centimetre class is worth in practice. Anyone choosing a flight module with this chip checks the module's firmware and the bands it actually uses.
Technical data
Other data
| Chipset | u-blox F9 (184 Kanaele)correct |
|---|---|
| Constellations | ['GPS', 'GLONASS', 'Galileo', 'BeiDou', 'QZSS', 'SBAS', 'NavIC']correct |
| Frequency bands | L1/L5: GPS L1C/A L5, GLO L1OF, GAL E1B/C E5a, BDS B1I B2a, QZSS L1C/A L1S L5, NavIC L5correct |
| Horizontal accuracy (cm) | 1correct |
| Interfaces | 2x UART, USB, SPI, I2C; NMEA, UBX, RTCM 3.3, SPARTN 2.0correct |
| RTK capable | yescorrect |
| Update rate (Hz) | 20correct |
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.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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