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FPV Electronics > Camera & GPS
The HT625N GNSS module delivers centimeter-level RTK positioning precision for UAV flight control and surveying applications. Engineered with multi-system satellite reception (BDS/GPS/Galileo/GLONASS) and integrated antenna design, it provides robust positioning performance in challenging environments. The module's fusion of carrier-phase RTK technology and inertial navigation ensures reliable operation during signal interruptions, making it ideal for precision mapping, agricultural drones, and autonomous systems requiring real-time kinematic accuracy.
| Parameter | Specification |
| Positioning Systems | BDS B1I/B2a/B3I, GPS L1/L2/L5, Galileo E1/E5, GLONASS L1/L2, QZSS, SBAS |
| RTK Accuracy | Horizontal: 8mm + 1ppm, Vertical: 15mm + 1ppm |
| Autonomous Accuracy | 1.5m CEP |
| Update Rate | 1–20 Hz (Configurable) |
| Channels | 555-channel GNSS engine |
| Time to First Fix | Cold start: <30s, Hot start: <1s |
| Sensitivity | Tracking: -167dBm, Acquisition: -148dBm |
| Data Interfaces | UART (115200bps), USB 2.0, CAN, SPI |
| Voltage Range | 3.3V ±10% |
| Power Consumption | 300mA @ RTK mode, 45mA @ continuous tracking |
| Dimensions | 25.4×25.4×7.1mm (L×W×H) |
| Antenna Type | Integrated ceramic patch w/LNA |
• RTK/PPK Fusion: Dual-frequency carrier-phase resolution for 8mm horizontal accuracy:cite[1]:cite[7]
• Multi-System Support: Full compatibility with BDS-3, GPS L5, Galileo E5:cite[3]:cite[7]
• Anti-Interference: Adaptive notch filtering suppresses 40dB narrowband jamming:cite[7]
• IMU Integration: Built-in 6-axis MEMS (gyro + accelerometer) for dead-reckoning during GNSS outages:cite[7]
• Intelligent Power Modes: Four configurable states (≤5μA sleep mode):cite[8]
| Operation Mode | Environment | Horizontal Error | Fixed Solution Time |
| RTK Fixed | Open sky | 8mm + 1ppm | <10s |
| RTK Float | Urban canyon | 35cm RMS | <30s |
| Autonomous | Forest | 1.5m CEP | N/A |
| IMU-Aided | Tunnel (10s outage) | <1m drift | Instant recovery |
• Aerial surveying/LiDAR mapping (cm-level photogrammetry)
• Precision agriculture (variable-rate spraying, crop scouting):cite[6]
• Search and rescue operations
• RTK base station networks
• Cadastral surveying and GIS data collection
• Deformation monitoring of infrastructure
• Robotic lawn mowers and agricultural machinery:cite[7]
• Autonomous guided vehicles (AGVs)
• Unmanned surface vessels (USVs)
• Operating Temp: -40°C to +85°C (industrial-grade):cite[5]:cite[8]
• Humidity Resistance: 0–95% RH non-condensing
• Vibration: 15G @ 10–500Hz (MIL-STD-810G compliant):cite[7]
• Water/Dust Protection: IP67-rated housing