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X21 is a full-system, full-frequency GNSS positioning and heading receiver supporting BDS, GPS, GLONASS, Galileo, and QZSS. Built on a high-performance GNSS SoC with RTK processing, it integrates Bluetooth, radio, 4G, and data storage. With multi-frequency anti-jamming and high sensitivity, it delivers reliable positioning and orientation for precision agriculture, surveying, and intelligent driving applications.
Features
high performance GNSS SoC chip
Support 1408 super channels
Supports high precisionRTK positioning for all satellite systems at all frequency points.
Support BDS B1I/B2I/B3I+GPS L1/L2/L5+GLONASS L1/L2+Galileo E1/E5a/E5b+QZSS L1/L2/L5+SBAS
Support two working modes: mobile station and base station
Built-in TF card,can save GNSS raw to TF
Support cell phone Bluetooth connection to the device after the device configuration
Intelligent anti-interference suppression technology
Compact size(75.0*50.0*12.8 mm) suitable for space-sensitive applications
Performance
| Parameter | Specification |
| Satellite frequency band | BDS B1, B2I, B3I GLONASS L1, L2 GPS/QZSS L1, L2, L5 Galileo E1, E5a, E5b |
| First positioning time | cold start: ≤30 s |
| cold start (AGNSS): ≤10 s | |
| warm start: ≤1 s | |
| Positional accuracy | Single point positioning(RMS): 1.5 m CEP(Horizontal) 2.5 m CEP(Altitude) |
| RTK: 0.8 cm+1 ppm (Horizontal) 1.5 cm+1 ppm (Altitude) | |
| Orientation accuracy | 0.1°/1m baseline |
| Velocity accuracy | 0.03 m/s CEP |
| initialization time | < 5 s (Typical value) |
| Initialization reliability | >99.9% |
| Data update rate | Position direction finding: 20Hz |
| 20Hz (Original observation) |
Pin Assignment
| Interface | NO. | Name | I/O | Describe | Condition |
| Interface 1 | 1 | RX1 | O | URAT1 Output (if unused, keep it open) | Reserved |
| 2 | TX1 | I | URAT1 Input (if not used, keep it open) | Reserved | |
| 3 | GND | G | Ground | Reserved | |
| 4 | VCC | P | main power supply | Reserved | |
| Interface 2 | 1 | PPS | O | time pulse | Usable |
| 2 | EVENT | I | external interrupt | Usable | |
| 3 | GND | G | Ground | Usable | |
| 4 | RX | O | URAT Output (if unused, keep it open) | Usable | |
| Interface 3 | 1 | RX2 | O | URAT2 Output (if unused, keep it open) | Usable |
| 2 | TX2 | I | URAT2 Input (if not used, keep it open) | Usable | |
| 3 | GND | G | Ground | Usable | |
| 4 | VCC | P | main power supply | Usable | |
| Interface 4 | 1 | CAN-CL | - | CAN Outpet | Usable |
| 2 | CAN-CH | - | CAN Input | Usable | |
| 3 | GND | G | Ground | Usable | |
| 4 | VCC | P | main power supply | Usable | |
| Interface 5 | 1 | RX0 | O | URAT0 Output (if unused, keep it open) | Reserved |
| 2 | TX0 | I | URAT0 Input (if not used, keep it open) | Reserved | |
| 3 | GND | G | Ground | Reserved | |
| 4 | NC | - | Reserved | Reserved |
Applicaiotn
Automotive Applications
Personnel protection
Precision Agriculture Driving tests
AVL and location-based services Vehicle navigation and trackin
Marine Navigation, Fleet Management
Geomatics
Handheld GPS Receiver Applications
Intelligent Logistics Dispatch
Mapping and Surveying
Intelligent Robotics
Protocol
| Parameters | Protocol |
| Data format | NMEA 0183, Unicore |
| Differential data | RTCM3.X |
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