Product overview
The UB4B0 tracks BDS, GPS, GLONASS, Galileo and QZSS satellite navigation signals simultaneously. It supports triple-frequency signals from BDS, GPS and Galileo.
Serial, USB and Ethernet interfaces provide connections for host equipment. The board also offers timing, external clock, CAN and odometer interfaces.
The product brief describes suppression of narrowband and single-tone radio interference within the supported satellite signal bands. It identifies UAVs as an intended operating environment for this positioning capability.
Specifications
| Specification | Value & conditions |
|---|---|
| Satellite systems | BDS, GPS, GLONASS, Galileo and QZSSSimultaneous tracking; triple-frequency support is stated for BDS, GPS and Galileo. |
| Documented UAV use | Use at scale by international UAV manufacturersHistorical report covering UB4B0 and UM482. |
| Model | Unicore UB4B0; all-system GNSS high-precision board |
| Chip and channels | NebulasII high-performance SoC; 432 channels; dedicated fast-acquisition engine |
| Supported signals | BDS B1I/B2I/B3I/B1C/B2a; GPS L1/L2C/L2P(Y)/L5; GLONASS G1/G2; Galileo E1/E5a/E5b; QZSS L1/L2/L5 |
| Positioning modes | Independent positioning with any single constellation; combined multi-constellation positioning |
| Interference mitigation and tracking | Adaptive narrowband interference suppression up to 60 dB; centimeter-level RTK positioning; carrier-phase observations better than 1 mm; multipath mitigation; low-elevation tracking |
| Data quality | Data completeness ≥98%; multipath ≤0.3 cm; o/slip ≥4000All constellations. |
| Single-point positioning accuracy | Horizontal: 1.5 m; vertical: 2.5 mRMS. |
| DGPS accuracy | Horizontal: 0.4 m; vertical: 0.8 mRMS. |
| RTK accuracy | Horizontal: 0.8 cm + 1 ppm; vertical: 1.5 cm + 1 ppmRMS. |
| Code observation accuracy | B1/B1C/L1 C/A/G1/E1: 10 cmRMS. |
| Code observation accuracy | B2/L2P(Y)/L2C/G2/E5b: 10 cm; B3/B2a/L5/E5a: 10 cmRMS. |
| Carrier-phase observation accuracy |
|
| Acquisition times | Cold start: less than 40 s; reacquisition: less than 1 s |
| RTK initialization time | Less than 5 sTypical value. |
| Initialization reliability | Greater than 99.9% |
| Differential data format | RTCM V3.0/3.2 |
| Output data formats | NMEA-0183; UnicoreUnicore format supported by specific firmware versions. |
| Data update rates | Observation data: 20 Hz; positioning data: 20 HzSupported by specific firmware versions. |
| Timing and velocity accuracy | Timing: 20 ns; velocity: 0.03 m/sRMS. |
| Dimensions and weight | 60 x 100 x 11.4 mm; 45 g |
| Temperature ranges | Operating: -40°C to +85°C; storage: -55°C to +95°C |
| Humidity | 95%Non-condensing. |
| Connectors |
|
| Vibration and shock standards | Vibration: GJB150.16A-2009, MIL-STD-810; shock: GJB150.18A-2009, MIL-STD-810 |
| Antenna LNA supply | 4.75–5.10 V; 0–100 mA |
| RTC supply and voltage ripple | RTC: 3.0–3.3 V DC; voltage ripple: 100 mVpp |
| Power consumption | 2.8 WTypical value. |
| Functional interfaces | 1 x UART (RS-232); 2 x UART (LVTTL); 1 x LAN, 10/100M; 2 x 1PPS (LVTTL); 1 x Event |
| External clock input | Supported |
| Custom protocols | Supported |
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