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G70 / G90 High-Precision GNSS RTK Modules
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The G70 / G90 Series provides high-precision multi-constellation GNSS positioning for mobile robots, UAVs, unmanned vehicles, precision agriculture, surveying, mapping, and outdoor autonomous systems. G70 is a compact single-antenna RTK positioning module, while G90 adds broader multi-frequency support, dual-antenna heading, and higher channel capacity for more demanding navigation applications.
- Multi-constellation GNSS support including GPS, BeiDou, GLONASS, Galileo, and QZSS
- Centimeter-level RTK positioning when suitable differential correction data is available
- G70: compact single-antenna RTK module with 184 channels
- G90: 1408-channel multi-frequency GNSS module with dual-antenna heading support
- G90 heading accuracy: 0.1° RMS at a 1 m antenna baseline
- NMEA-0183 and RTCM 3.3 support for navigation and correction-data integration
- USB Type-C data output, TTL / RS232-level output, and MCX antenna connection
- Operating temperature range: -40°C to +85°C
Product Overview
The G70 and G90 are designed for systems that require more accurate outdoor positioning than standard single-point GNSS can provide. Both modules support multi-system satellite positioning and can use RTK differential correction data to achieve centimeter-level positioning under suitable satellite visibility, antenna installation, and correction conditions.
G70 uses a single-antenna architecture and is intended for compact RTK positioning applications where heading from a second GNSS antenna is not required. G90 is the higher-performance option, offering 1408 channels, broader multi-frequency signal tracking, and synchronized dual-antenna operation for both high-precision position and heading output.
Both models provide Type-C USB data output, TTL / RS232-level serial output, RTCM correction support, NMEA navigation output, PPS timing, and external GNSS antenna connectivity. The modules are suitable for integration with embedded computers, robotic controllers, navigation stacks, and custom positioning systems.
Key Features
Multi-Constellation GNSS Positioning
The series supports combined positioning using GPS, BeiDou, GLONASS, Galileo, and QZSS signals. Multi-system reception improves satellite availability and provides a more flexible foundation for outdoor robotic and autonomous-system positioning.
Centimeter-Level RTK Positioning
With suitable RTK correction data, G70 provides horizontal RTK accuracy down to 1 cm + 1 ppm, while G90 is specified at 0.8 cm + 1 ppm horizontally and 1.5 cm + 1 ppm vertically.
G90 Dual-Antenna Heading
G90 supports synchronized dual-antenna positioning and heading. The specified heading accuracy is 0.1° at a 1 m baseline, allowing heading to be measured even when the platform is stationary. Dual-antenna heading is not supported by G70.
Navigation and Correction Protocols
Both modules support NMEA-0183 navigation output and RTCM 3.3 correction data. G70 additionally supports UBLOX-format output, while G90 supports the Unicore protocol.
G70 vs. G90
| Parameter | G70 | G90 |
|---|---|---|
| Positioning Architecture | Single antenna | Dual antenna |
| Channels | 184 | 1408 |
| RTK Horizontal Accuracy | ≤1 cm + 1 ppm CEP | 0.8 cm + 1 ppm CEP |
| RTK Vertical Accuracy | 1.5 cm + 1 ppm (selection guide) | 1.5 cm + 1 ppm CEP |
| Single-Point Horizontal Accuracy | 1.5 m CEP | 1.5 m CEP |
| Single-Point Vertical Accuracy | 2.5 m (selection guide) | 2.5 m CEP |
| Velocity Accuracy | 0.05 m/s | 0.03 m/s |
| Heading Output | No dual-antenna heading | 0.1° / 1 m baseline |
| Positioning Update Rate | Default 5 Hz; configurable 1–20 Hz | Default 1 Hz; configurable 1–20 Hz |
| Cold Start | ≤30 s | <30 s |
| Hot Start | ≤5 s | ≤2 s |
| Output Protocol | NMEA-0183, RTCM 3.3, UBLOX | NMEA-0183, RTCM 3.3, Unicore |
| USB Interface | Type-C | Type-C |
| Antenna Interface | MCX | MCX |
| Dimensions | 54.5 × 46.5 × 13.2 mm | 58.5 × 45 × 14 mm |
| Weight | 36 g | 43 g |
GNSS Signal Support
G70
G70 supports GPS L1/L2, GLONASS G1/G2, BeiDou B1/B2, Galileo E1/E5, and QZSS L1/L2 signals for multi-system positioning.
G90
The G90 primary antenna supports GPS L1C/A, L2P(Y)/L2C and L5; GLONASS L1/L2; Galileo E1/E5a/E5b; QZSS L1/L2/L5; and BeiDou B1I/B2I/B3I. Its secondary antenna is used for the supported dual-antenna heading architecture.
Electrical & Environmental Specifications
| Parameter | G70 / G90 |
|---|---|
| Supply Voltage | 5 V |
| Current | 500 mA |
| Baud Rate | 4800–921600 bps |
| Output Level | TTL level / RS232 level |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -40°C to +125°C |
Full-Frequency GNSS Antenna Reference
The full-frequency mushroom-style GNSS antenna features 5.5 dBi gain, 40 ± 2 dB LNA gain, RHCP polarization, TNC-K connector, 50 Ω impedance, IP67 protection, and support for major GNSS frequency bands including BeiDou, GPS, GLONASS, Galileo, and QZSS.
Which Model Should I Choose?
G70 — Compact RTK Positioning
Choose G70 when you mainly need centimeter-level position and do not require GNSS dual-antenna heading. Its lower weight and compact size make it suitable for UAVs, mobile robots, robotic mowers, IoT systems, and space-constrained outdoor navigation projects.
G90 — Positioning + Dual-Antenna Heading
Choose G90 when you need both centimeter-level position and accurate heading, especially on slow-moving or stationary platforms. Its broader multi-frequency reception and 1408-channel architecture make it suitable for surveying, autonomous agricultural equipment, industrial UAVs, USVs, unmanned vehicles, and higher-end navigation systems.
Applications
Mobile Robots and Low-Speed Autonomous Vehicles
RTK positioning can be used for outdoor mobile robots, robotic mowers, UGVs, and other autonomous systems that require repeatable global position information.
UAVs and Unmanned Systems
Compact form factors, high-precision position output, and multi-constellation support make the modules suitable for UAV trajectory positioning and other unmanned platforms.
Surveying, Mapping and Precision Agriculture
G90's dual-antenna heading and broader signal support are useful for mapping, surveying, precision agriculture, autonomous agricultural machinery, and other applications that require both accurate position and orientation.
Need Help Selecting?
If you need a more modular mobile/base-station RTK architecture, compare the T-RTK UM982 centimeter-level GNSS RTK system. For inertial sensing and attitude measurement, compare the N300 Pro high-dynamic IMU or the H30 Series ROS IMU.
Key Features
1. Multi-Constellation GNSS Positioning
The G70 / G90 Series supports combined positioning using multiple satellite constellations, including GPS, BeiDou, GLONASS, Galileo, and QZSS. Multi-system reception improves satellite availability for outdoor robotics and autonomous navigation.
2. G90 Dual-Antenna Positioning & Heading
G90 supports full-frequency multi-constellation reception together with synchronized dual-antenna operation for centimeter-level positioning and heading output, including heading measurement while the platform is stationary.
Note: Dual-antenna positioning and heading are supported by G90 only. G70 is a single-antenna positioning module.
3. Centimeter-Level RTK Positioning
With suitable RTK differential correction data, the series supports centimeter-level high-precision positioning. horizontal RTK accuracy is up to 1 cm + 1 ppm for G70 and 0.8 cm + 1 ppm for G90.
RTK correction services may be delivered over an external network connection such as 4G, depending on the user's correction-data architecture. The GNSS modules themselves should not be assumed to include a built-in 4G modem unless separately configured.
Frequently Asked Questions
What is the difference between G70 and G90?
G70 is a compact single-antenna RTK positioning module with 184 channels. G90 is the higher-performance model with 1408 channels, broader multi-frequency signal support, and dual-antenna heading capability.
What RTK positioning accuracy do G70 and G90 provide?
horizontal RTK accuracy is up to 1 cm + 1 ppm CEP for G70 and 0.8 cm + 1 ppm CEP for G90. G90's vertical RTK accuracy is 1.5 cm + 1 ppm CEP.
Does G70 support dual-antenna heading?
No. Dual-antenna heading is a G90 feature. G70 is intended for single-antenna high-precision positioning.
What heading accuracy does G90 provide?
The specified G90 heading accuracy is 0.1° at a 1 m antenna baseline.
Can G90 provide heading while the vehicle is stationary?
Yes. The dual-antenna architecture allows heading to be determined without relying on vehicle motion, provided the antennas are installed correctly and suitable GNSS signals are available.
Which satellite systems are supported?
The series supports multiple GNSS constellations including GPS, BeiDou, GLONASS, Galileo, and QZSS. The exact supported frequency bands differ between G70 and G90.
Do I need RTK correction data to achieve centimeter-level accuracy?
Yes. Centimeter-level RTK positioning requires suitable differential correction data and appropriate satellite visibility, antenna placement, communication, and operating conditions.
What positioning update rate does G70 support?
G70 defaults to 5 Hz and supports configurable positioning update rates from 1 to 20 Hz. For normal operation, an update rate of 5 Hz or below is recommended.
What correction and navigation protocols are supported?
Both models support NMEA-0183 navigation output and RTCM 3.3 correction data. G70 also supports UBLOX-format output, while G90 supports the Unicore protocol.
What interfaces are available?
Both models provide USB Type-C data output, TTL / RS232-level serial output, a 12-pin debugging connector, and an MCX antenna interface.
What power supply do the modules require?
Both G70 and G90 use a 5 V supply. current is 500 mA.
What are the dimensions and weights?
G70 measures 54.5 × 46.5 × 13.2 mm and weighs 36 g. G90 measures 58.5 × 45 × 14 mm and weighs 43 g.
What is the operating temperature range?
Both modules are specified for operation from -40°C to +85°C.
Which model should I choose for a mobile robot or UAV?
Choose G70 when you mainly need compact centimeter-level positioning. Choose G90 when your platform also needs GNSS-based heading, broader multi-frequency reception, or a higher channel count for more demanding navigation applications.
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