Main Features of Youwei GPS GNSS Positioning Modules
1, Weak-Signal Performance
Reliably acquires and maintains satellite locks even in challenging environments (e.g., urban canyons, indoor-outdoor transitions).
2, Multi-Channel Satellite Tracking
Multi-channel receiver processes signals from GPS, GLONASS, Galileo, and BeiDou simultaneously, enhancing fix speed and accuracy.
3, Rapid Initialization
Hot start: <1s (with ephemeris retention)
Warm start: <28s (using almanac data)
Cold start: <30s (full satellite scan)
4, Energy Efficiency
Optimized power architecture reduces operating current to ≤25mA without sacrificing performance.
5, Environmental Resilience
Stable operation across -40°C to +85°C and high-electromagnetic-noise areas.
6, Anti-Interference Design
Minimizes multipath errors for consistent positioning near reflective surfaces.
7, Global Compatibility
Supports all mainstream GNSS constellations (configurable via firmware).
8, Data & Integration
Standard NMEA 0183 output + customizable binary protocols.
Compact 35mm × 25mm SMD package for space-constrained designs.
9, Quality Assurance
FCC/CE/RoHS certified
Parameters of YW-35254G1 GPS GNSS Locating Module
| Item | Parameters |
| Item No. | YW-35254G1 |
| Chip | Per order requirement |
| Frequency | GPS L1 C/A SBAS L1 C/A QZSS L1 C/A GLONASS L1OF BeiDou B1 Galileo E1B/C² Customized |
| Number of Channels | As per order |
| Positioning Accuracy | 2m to 5m |
| Velocity | 515 m/s |
| Velocity Accuracy | Without aid : 0.1m/s DGPS: 0.05m/s |
| TTFF (Time-To-First-Fix) | Hot start: 1 second typical Warm start: 28 seconds typical Cold start: 30 seconds typical |
| Sensitivity | Tracking Sensitivity: -162 dBm Acquisition Sensitivity: -160 dBm typical Cold Start:-147dBm |
| Baud Rate | 9600 bps (default) |
| Navigation Update Rate | 1Hz (default), maximum 10Hz |
| Timing Accuracy | 25 ns RMS |
| Interface Type | UART, I2C, SPI, USB |
| Data Output Format | NMEA 0183 |
| Power Supply | 3.3V ~ 5V |
| Working Temperature Range | -40°C to 85°C |
| Antenna Type | patch ceramic antenna |
| AGPS | Supported |
| Dimension | 35*25*4mm |
| Package Type | SMD |
| Origin | China |
| White label | Acceptable |
The Significance of TTFF (Time To First Fix) for GPS Modules
TTFF is a critical performance metric for GPS modules, directly impacting user experience and system efficiency. Here’s why it matters:
1. Enhanced User Experience
Faster Response: Shorter TTFF means quicker location acquisition (e.g., <1s hot start vs. 30s cold start).
Critical for Emergency Use: Rapid TTFF (<10s) is vital for rescue trackers, security devices, and real-time navigation.
2. Technical Performance Indicator
Signal Processing Efficiency: Low TTFF reflects:
High Sensitivity (e.g., -162dBm tracking for weak signals).
Optimized Algorithms (fast satellite ephemeris decoding).
Multi-Constellation Support (GPS + Galileo/BeiDou reduces TTFF).
Power Efficiency: Hot-start-capable modules minimize power drain during frequent restarts.
3. Application-Specific Requirements
| Startup Mode | TTFF Range | Use Case Example |
| Cold Start | 25-40s | First-time use/long power-off |
| Warm Start | 15-30s | Short power interruption |
| Hot Start | <1s | Quick wake-up (e.g., car ignition) |
4. Industry Benchmarks
Consumer Modules: ≤30s (cold start).
Industrial Modules: ≤20s (e.g., drones, surveying).
Military-Grade: ≤10s (anti-jamming + multi-band support).
5. Design Implications
Battery Life: Frequent cold starts (high TTFF) increase power consumption.
Cost Trade-offs: Low TTFF may require higher-end chips or external flash memory (e.g., for ephemeris caching).
Product Tags:
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High Reliable GPS GNSS Locating Receiver Module with Built-in Antenna Images
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