Dual-core Architecture Test of TW5794: How ZED-F9P + NEO-D9S Achieve Centimeter-Level Positioning Accuracy
Field test data shows that GNSS modules using a dual-core architecture can improve positioning accuracy from meter-level to centimeter-level and reduce convergence time to under 60 seconds. As a compact solution integrating ZED-F9P and NEO-D9S, the TW5794 is redefining the hardware threshold for high-precision positioning. This article breaks down the technical principles and engineering implementation of this architecture based on real machine test data.
- Dual-Core Synergy Mechanism: ZED-F9P performs RTK calculations, while NEO-D9S provides satellite-based PPP-RTK corrections.
- Accuracy Performance: 1.5cm + 1ppm horizontal accuracy, PPP-RTK convergence time < 90 seconds.
- Integration Advantages: Built-in active antenna bias and SAW filter, compact 12×16mm size.
- Coverage Capability: Satellite links ensure positioning continuity in environments without networks, such as oceans or deserts.
Dual-Core Architecture Technical Background and Core Advantages
Traditional single-frequency GNSS modules are limited by ionospheric errors and multipath effects, with positioning accuracy typically between 2-5 meters. The maturity of PPP-RTK (Precise Point Positioning - Real-Time Kinematic) technology has opened a new path for "base-station-free high-precision positioning." The core of the ZED-F9P+NEO-D9S dual-core architecture lies in the former handling multi-band multi-constellation signal reception and RTK solution, while the latter receives satellite-broadcast correction data via L-band.
| Performance Metric | Traditional RTK (Single-Core) | TW5794 PPP-RTK (Dual-Core) |
|---|---|---|
| Base Station Dependency | Required (within 30km) | Not Required (Satellite Broadcast) |
| Horizontal Accuracy | 1cm + 1ppm | 1.5cm + 1ppm |
| Network Coverage Requirements | Requires 4G/5G/NTRIP | All-terrain (including signal dead zones) |
| Typical Convergence Time | < 10s | 45s - 90s |
RTK+PPP-RTK Fused Positioning Principle
RTK relies on carrier phase difference from base stations, offering high accuracy but limited baseline. PPP-RTK broadcasts precision corrections via geostationary satellites, achieving global coverage. The dual-core architecture prioritizes RTK fixed solutions and seamlessly switches to PPP-RTK mode if base station signals are interrupted, balancing real-time accuracy and global availability.
TW5794 Hardware Architecture Deep Dive
The TW5794 integrates the dual-core solution into a 12×16×2.4mm module. Its RF front-end uses a dual-path LNA architecture, with the GNSS main link noise figure controlled below 1.5dB and L-band correction link sensitivity reaching -130dBm. The built-in SAW filter effectively filters out environmental electromagnetic interference, ensuring locking stability in urban environments.
