SIYI RTK Positioning & Orientation Module, Dual-Antenna Heading

The SIYI RTK Positioning and Orientation Module is a compact multi-band RTK GNSS receiver that delivers centimetre-level position and dual-antenna heading from one 22.8g board. Heading comes from the two antennas rather than the magnetometer alone, which keeps yaw reliable near high-current wiring, steel structures and power lines; it suits survey, inspection and agricultural UAVs as well as UGVs and autonomous robots.

Key features

• RTK accuracy of 0.8cm + 1ppm horizontal and 1.5cm + 1ppm vertical with RTCM3.x corrections.
• Dual-antenna orientation with 0.2° heading accuracy on a 1m baseline.
• Multi-band tracking across BeiDou, GPS, GLONASS, Galileo and QZSS, plus SBAS; 50+ satellites in RTK.
• PNI RM3100 industrial magnetometer with an anti-interference design as a backup heading source.
• 5Hz default output, up to 20Hz.
• UART + I2C, a second UART and USB-C; supplied with two BT-560 antennas and flight-controller cables.

Specifications

• RTK accuracy: 0.8cm + 1ppm (H), 1.5cm + 1ppm (V)
• Single-point accuracy: 1.5m (H), 2.5m (V)
• Heading accuracy: 0.2° at 1m baseline
• Antenna 1 bands: BeiDou B1I/B2I/B3I, GPS L1C/A/L2P(Y)/L2C/L5, GLONASS L1/L2, Galileo E1/E5a/E5b, QZSS L1/L2/L5
• Antenna 2 bands: BeiDou B1I/B2I/B3I, GPS L1C/A/L2C, GLONASS L1/L2, Galileo E1/E5b, QZSS L1/L2
• Update rate: 5Hz default, 20Hz max
• Correction format: RTCM3.x
• Acquisition: cold start under 30s, hot start under 5s
• Compass: PNI RM3100
• Interfaces: UART + I2C, UART, USB-C
• Antenna connectors: 2 × MMCX
• Working voltage: 4.5–5.5V, 1W
• Dimensions: 40 × 30.5 × 15mm
• Weight: 22.8g
• Operating temperature: −30 to 75°C
• In the box: RTK module, 2 × BT-560 GNSS antennas, 2 × SMA to MMCX cables, UART1-to-GPS cable, TELEM4 adapter cable, USB-C cable

Centimetre positioning needs RTCM corrections from a base station or NTRIP service; heading works from the two antennas alone. Mount the antennas as far apart as the frame allows, since heading accuracy is quoted at a 1m baseline and a shorter one gives coarser heading.