Product overview
The NM871B from Changsha Jinwei Integrated Circuit Co., Ltd is a compact positioning and integrated navigation module for incorporation into equipment such as UAVs. Its physical architecture combines the manufacturer’s NEMO baseband/RF chip with built-in inertial navigation, using deeply coupled GNSS+INS processing and INS-assisted solutions. It supports RTK and DGNSS differential positioning alongside PPP and PPP-RTK. The hardware is a navigation module for system integration; its specified configuration centers on satellite reception, inertial navigation and electrical interfaces.
The module occupies 17mm × 22mm × 2.8mm and uses a standard footprint and pin definitions to support integration. Connections comprise three UARTs and one each of I2C, PPS and SPI, with a 3.0V–3.6V DC supply. Reception covers the listed BDS, GPS, GLONASS, Galileo and QZSS signals, while SBAS L1 is optional. Raw data and RTK outputs operate at 10Hz in GNSS-only mode and 5Hz when integrated navigation is enabled; integrated navigation updates at 100Hz. RTK accuracy is specified separately for horizontal and vertical positioning, and initialization figures apply to a 10km baseline.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Changsha Jinwei Integrated Circuit Co., Ltd NM871B integrated navigation and positioning module. |
| Processing and navigation architecture | Manufacturer-developed NEMO chip integrating baseband and RF processing; built-in inertial navigation with deeply coupled GNSS+INS and INS-assisted solutions; RTK, PPP and PPP-RTK positioning. |
| Differential positioning modes | RTK and DGNSS differential positioning; PPP positioning; centimeter-level positioning capability. |
| BDS reception | B1I, B2I, B3I, B1C, B2a, B2b. |
| GPS reception | L1CA, L1C, L2C, L5. |
| GLONASS reception | L1, L2. |
| Galileo reception | E1, E5a, E5b. |
| QZSS reception | L1, L2. |
| SBAS reception | L1.Optional SBAS configuration. |
| Raw data update rate | 10Hz with GNSS only; 5Hz with integrated navigation enabled.GNSS-only operation or integrated navigation enabled, respectively. |
| RTK positioning update rate | 10Hz with GNSS only; 5Hz with integrated navigation enabled.GNSS-only operation or integrated navigation enabled, respectively. |
| Integrated navigation update rate | 100Hz.Integrated navigation enabled. |
| Single-point positioning accuracy | Horizontal ≤1.5m; vertical ≤3.0m.Single-point positioning; 1σ. |
| DGNSS accuracy | Horizontal ≤0.3m+10ppm; vertical ≤0.6m+10ppm.DGNSS positioning; 1σ. |
| RTK accuracy | Horizontal ≤1cm+1ppm; vertical ≤2cm+1ppm.RTK positioning; 1σ. |
| Dead-reckoning accuracy | 2% × distance traveled.Integrated navigation dead reckoning over 1km or 2min. |
| Timing accuracy | ≤20ns.1σ. |
| Velocity accuracy | ≤0.05m/s.1σ. |
| Cold-start time | ≤35s.Cold start. |
| Hot-start time | ≤5s.Hot start. |
| Reacquisition time | ≤1s. |
| RTK initialization time | ≤5s.10km baseline. |
| RTK initialization reliability | ≥99.9%.10km baseline. |
| Supported protocols | RTCM2.X, RTCM3.X, NMEA-0183 and custom protocol. |
| Dimensions and integration footprint | Standard 17mm × 22mm footprint and pin definitions; overall dimensions 17mm × 22mm × 2.8mm. |
| Supply voltage | 3.0V–3.6V DC.DC supply. |
| Humidity | 95%, non-condensing.Non-condensing. |
| Operating temperature | -40°C to +85°C.Operating. |
| Storage temperature | -55°C to +125°C.Storage. |
| Functional interfaces | 3 × UART, 1 × I2C, 1 × PPS, 1 × SPI. |
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