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Parameters of YW-35254G3 GNSS GPS Locating Module
| Item | Parameters |
| Item No. | YW-35254G3 |
| Brand | Youwei |
| Chip | As per order |
| Frequency | GPS L1 C/A SBAS L1 C/A QZSS L1 C/A GLONASS L1OF BeiDou B1 Galileo E1B/C² Customized |
| Number of Channels | 32 to 99, As per order |
| Positioning Accuracy | 2 meters to 5 meters |
| 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 |
| Operating Supply Current | Typical 25mA |
| Environment Temperature Range | -40°C to 85°C |
| Antenna Type | patch ceramic antenna |
| AGPS | Supported |
| Product Size | 35x25x4mm |
| Package Type | SMD |
| Origin of Country | China |
| White label | Acceptable |
| Packing way | Tray/Reel/Tube |
What is AGPS (Assisted GPS) in GPS Modules?
AGPS (Assisted GPS) is a technology that enhances GPS positioning performance by combining satellite signals with external assistance data (e.g., cellular networks, Wi-Fi) to improve speed, accuracy, and reliability. Below is a detailed explanation of AGPS, including its working principles and advantages:
1. Definition
AGPS improves traditional GPS by using external assistance data, making it particularly effective in weak-signal environments such as urban canyons or indoors.
2. How AGPS Works
Assistance Data Retrieval:
The AGPS GPS device obtains satellite ephemeris, clock corrections, and other aiding data from cellular networks or the internet.
Faster Positioning:
Assistance data helps the GPS device quickly acquire satellite signals, significantly reducing Time-To-First-Fix (TTFF).
Hybrid Positioning:
Combines GPS, cellular, and Wi-Fi signals to enhance accuracy and reliability.
3. Key Advantages of AGPS GPS Module
✔ Faster Fix – Dramatically reduces TTFF (from minutes to seconds).
✔ Higher Accuracy – Maintains better positioning in weak-signal areas.
✔ Lower Power Consumption – Reduces satellite search time, saving battery.
✔ Wider Applicability – Works well in urban, indoor, and complex environments.
4. Typical Applications of AGPS GPS Modules
Smartphones – Enables quick location fixes for navigation and location-based services.
Vehicle Navigation – Provides stable positioning in urban canyons.
IoT Devices – Ideal for devices requiring fast positioning.
Emergency Services – Quickly locates emergency calls (e.g., E911).
5. AGPS vs. Traditional GPS
| Feature | AGPS | Traditional GPS |
| Data Source | Satellite + Cellular/Wi-Fi aids | Satellite signals only |
| TTFF | Seconds | Minutes (cold start) |
| Weak Signals | Performs well | Struggles |
6. Conclusion
AGPS significantly enhances positioning speed, accuracy, and reliability by integrating satellite signals with assistance data. It is widely used in smartphones, vehicle navigation, IoT devices, and emergency services—especially in challenging environments like cities and indoors.
