Holybro H-RTK Unicore UM982
Series: Holybro RTK GNSS modules for drones
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The Holybro H-RTK Unicore UM982 is a multi-band RTK GNSS with heading from two antennas for medium-class multicopters. Chinese maker Holybro uses the Unicore UM982 chip.
The chip handles GPS, GLONASS, Galileo, BeiDou and QZSS in several bands, among others GPS L1C/A, L2P(Y), L2C and L5, Galileo E1, E5a and E5b, and BeiDou B1I, B2I and B3I. The accuracy figure of 0.8 cm comes from the chip maker, not from Holybro: for the UM982 Unicore states RTK horizontally 0.8 cm + 1 ppm as RMS. RMS is a spread measure covering roughly two thirds of the measurements and is not to be equated with the CEP figures of other modules. For the base station Holybro names a survey-in time of at most 5 min at 2.0 m CEP; survey-in means a base averages its own position for a few minutes. For heading Unicore gives 0.1 degrees at the chip, at a 1 m baseline. Output runs at 20 Hz. The compass is an IST8310, and connection is through UART with GH connectors (10-pin and 6-pin). The module weighs 40.3 g without antennas.
The heading arises from the position of the two antennas relative to each other and is therefore independent of the magnetic field. It is available even at standstill, where a magnetic compass is disturbed by metal on the ground. The EU classes apply to the aircraft: from C1 upward geo-awareness and remote ID are mandatory, both resting on the GNSS position. Corrections come from a base, a radio link or NTRIP.
For selection, the antenna spacing counts: it is measured and entered in the flight controller, and both antennas need a clear view. Anyone who does not need heading from two antennas will find a lightweight variant of 25.4 g in the same range. Upkeep includes compass calibration, firmware and checking the antenna cables for kinks.
Technical data
Other data
| Chipset | Unicore UM982correct |
|---|---|
| Compass | IST8310correct |
| Constellations | ['GPS', 'GLONASS', 'Galileo', 'BeiDou', 'QZSS']correct |
| Frequency bands | B1I/B2I/B3I; L1C/A, L2P(Y), L2C, L5; G1/G2; E1/E5a/E5b; QZSS L1/L2/L5correct |
| Horizontal accuracy (cm) | 0.8correct |
| Interfaces | UART (GH 10-/6-polig)correct |
| RTK capable | yescorrect |
| Update rate (Hz) | 20correct |
| Weight (g) | 40.3correct |
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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