RTK + DEAD RECKONING
TAU951M-K2 GNSS Module
TAU951M-K2 is a GNSS dual-band high-precision RTK navigation and positioning module with dead reckoning, based on the CYNOSURE IV dual-core SoC (22 nm). By combining GNSS positioning with inertial navigation technology and a built-in 6-axis IMU, it outputs continuous positioning data even where GNSS signal quality is poor or lost — such as tunnels and underground parking — providing reliable positioning for smart driving, surveying and mapping, UAVs and intelligent agriculture.
SystemGPS / BDS / GAL / GLO / QZSS / NavIC
AccuracyRTK 1 cm + 1 ppm (H) · INS <2% of distance
BandL1 + L2/L5
Use CaseSmart Driving / Autonomous / UAV
Key Features
Why TAU951M-K2 Stands Out
Dual-band RTK module with integrated 6-axis IMU dead reckoning, providing continuous positioning in tunnels, urban canyons and GNSS-denied environments.
RTK + Dead Reckoning
Internal PVT, RTD, RTK and DR engines with a built-in 6-axis IMU for continuous positioning through signal outages.
Seamless Outage Handling
INS positioning error below 2% of distance travelled — keeps position alive in tunnels and underground garages.
Centimeter-Level RTK
RTK accuracy of 1.0 cm + 1 ppm (H) / 2.0 cm + 1 ppm (V), with PPP-B2b / PPP / PPP-RTK support upon request.
Free Installation
No exact placement requirement — flexible integration into existing vehicle and device architectures.
Technical Specifications
Specification Overview
Key electrical and performance parameters for TAU951M-K2. Full details are available in the official datasheet.
| Parameter | Specification |
|---|---|
| GNSS Reception | GPS/QZSS: L1C/A, L1C, L2C, L5 · BDS: B1I, B1C, B2I, B2a · GLONASS: G1, G2 · Galileo: E1, E5a, E5b · NavIC: L5 · SBAS: L1 |
| Channels | 128 GNSS signal channels, 10 Hz maximum update rate |
| Position Accuracy | GNSS 1.0 m CEP · RTK 1.0 cm + 1 ppm (H) / 2.0 cm + 1 ppm (V) |
| DR Performance | IMU raw data 50 Hz max · INS positioning error <2% of distance travelled |
| Sensitivity | Cold start -148 dBm · Hot start -155 dBm · Tracking -165 dBm |
| TTFF | Hot start 1 s · Cold start 27 s |
| Power Consumption | 35 mA @ 3.3V tracking · 16 µA data backup |
| Voltage | 1.75 – 3.63 V main / I/O · 1.62 – 3.63 V backup |
| Interfaces | UART × 2 · SPI × 1* · I2C × 1* |
| Operating Temperature | -40°C to +85°C |
| Package | 24-pin LCC · 16.0 × 12.2 × 2.4 mm |
Performance Notes
Combining GNSS positioning and inertial navigation, TAU951M-K2 outputs continuous and accurate positioning in environments where GNSS signals are degraded or unavailable, such as tunnels, underground parking and dense urban canyons.
Dual-band RTK module with integrated 6-axis IMU dead reckoning, providing continuous positioning in tunnels, urban canyons and GNSS-denied environments.
- > Built-in 6-axis IMU with raw data output at 50 Hz
- > Supports free installation — no precise mounting needed
- > Smart jammer detection and suppression
- > PPP-B2b / PPP / PPP-RTK support upon request
Applications
Where TAU951M-K2 Fits Best
Four representative scenarios showing how TAU951M-K2 supports reliable positioning products.
Autonomous Navigation
Continuous positioning where GNSS is blocked
Smart Driving
Reliable positioning for assisted and autonomous driving
UAV
Resilient navigation through signal-degraded areas
Agriculture
RTK guidance that keeps working under tree canopy
Why Choose TAU951M-K2
Advantages at a Glance
What TAU951M-K2 brings to your product — technically and commercially.
Keeps positioning alive in tunnels, parking garages and urban canyons where pure GNSS fails
Built-in IMU removes the need for an external dead-reckoning chip — lower BOM and simpler design
Same compact package and interface as TAU951M-P2 for easy platform upgrades
Free installation reduces assembly constraints and integration cost
TAU951M-K2 VALUE
Designed for Practical Deployment
The module balances performance, integration simplicity and industrial reliability for scalable product development.
RTK + DRKey capability
6-Axis IMUPositioning performance
128 ChannelsArchitecture
SMTLCC package, industrial grade
Downloads
Documents & Resources
Download the files you need for product evaluation, hardware development and integration.
Datasheet PDF
Product overview, technical parameters and performance description for TAU951M-K2.
DownloadHardware Design Guide
Reference layout, antenna guidance and suggested design considerations.
RequestIntegration Guide
Step-by-step integration notes for firmware, interfaces and system bring-up.
RequestFAQ
Frequently Asked Questions
Common questions about TAU951M-K2 functionality and typical use cases.
Dead reckoning (DR) uses inertial sensors to compute position when GNSS signals are blocked. TAU951M-K2 integrates a 6-axis IMU so devices keep outputting position in tunnels, underground parking and urban canyons.
The INS positioning error is below 2% of the distance travelled, which keeps position output usable through typical tunnels and short outages.
Yes. IMU raw data is available at up to 50 Hz, allowing customers to run their own sensor-fusion algorithms if needed.
Yes. It shares the same 24-pin LCC package (16.0 × 12.2 × 2.4 mm) and interfaces, so designs can migrate between P2 (RTK) and K2 (RTK+DR) easily.
Need a GNSS Module for Your Project?
Contact our engineering team for technical guidance, sampling support and quotation assistance for TAU951M-K2 or other GNSS solutions.