Product overview
The Unicore UB4B0M is a compact, high-precision GNSS board for RTK positioning, with applications in surveying RTK equipment and drone base stations. Built around Unicore's NebulasII SoC, it supports BDS, GPS, GLONASS, Galileo and QZSS, with independent single-system positioning and combined multi-system positioning. Its positioning features include chip-level multipath suppression, instantaneous RTK, RTK-KEEP and low-elevation tracking. The UB4B0M belongs to Unicore's previous-generation hardware range.
The board provides centimeter-level RTK positioning, with a specified RMS accuracy of 1 cm + 1 ppm and carrier-phase observations better than 1 mm. Single-point positioning accuracy is specified as 1 m RMS, and the GNSS data update rate is 10 Hz. Startup times are less than 26 seconds from a cold start, less than 22 seconds from a warm start and less than one second from a hot start. The design also supports custom protocols and compatibility with mainstream GNSS OEM board dimensions and pin layouts.
Specifications
| Specification | Value & conditions |
|---|---|
| Model and function | UB4B0M compact RTK positioning boardBoard description. |
| Documented applications | Surveying RTK equipment and drone base stationsApplications stated. |
| Product generation | Previous generationListed in the manufacturer's historical product index. |
| Model | Unicore UB4B0M compact high-precision RTK positioning board |
| SoC | NebulasII high-performance SoC |
| Super channels | 432 |
| Channels | 96 |
| GNSS support | BDS, GPS, GLONASS, Galileo and QZSS; all systems and frequencies |
| Signals | BDS B1I/B1C/B2a/B2b; GPS L1/L2/L5; GLONASS G1/G2; Galileo E1/E5b/E5a; QZSS L1/L5; SBAS L1; NAVIC L5 |
| Carrier-phase observations | Better than 1 mm |
| Positioning modes | Independent single-system positioning and combined multi-system positioning |
| Multipath suppression | Chip-level multipath suppression |
| Instantaneous RTK | Supported |
| RTK-KEEP | Supported |
| Low-elevation tracking | Supported |
| Serial and timing ports | 3 serial ports; 1 × 1PPS |
| Single-point positioning accuracy | 1 mRMS |
| RTK positioning accuracy | 1 cm + 1 ppmRMS |
| Vertical positioning accuracy | 1.2 mRMS |
| Vertical positioning | 5 ns; peak-to-peak 30 ns (24 h)RMS; peak-to-peak over 24 h |
| Startup time | Less than 26 sCold start |
| Startup time | Less than 22 sWarm start |
| Startup time | Less than 1 sHot start |
| Current consumption | Less than 25 mATracking; supply voltage 3 V |
| Current consumption | Less than 30 mAAcquisition; supply voltage 3 V |
| Sensitivity | -165 dBmTracking |
| Sensitivity | -148 dBmReacquisition |
| Interfaces | 2 × UART; 1 × I2C; 1 × SPI; GPIOs |
| VCC supply voltage | 1.7–3.6 V |
| VIO supply voltage | 1.7–3.6 V |
| Backup supply voltage | 1.7–3.6 V |
| Data formats | MEA-0183; Unicore; RTCM 3.x |
| Data update rate | 10 HzGNSS |
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