Comparing GPS/BDS Unit v1.1 and Unit-GPS SMA
Introduction
When working on positioning and navigation projects, choosing the right GNSS module is crucial for optimal performance. M5Stack offers two excellent choices: the GPS/BDS Unit v1.1 (AT6668) and the Unit-GPS SMA. Both are versatile and reliable, but they differ in design, antenna configuration, and ideal use cases. This article looks at the features and differences of these two modules.
GPS/BDS Unit v1.1 (AT6668)
The GPS/BDS Unit v1.1 is a compact GNSS module designed for projects where space is at a premium. Equipped with the AT6668 navigation chip and an integrated ceramic antenna, it provides accurate location data in a streamlined form factor.
Key Features
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Chip: AT6668
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Antenna: Built-in ceramic antenna
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Interface: UART
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Signal Amplification: Features the MAX2659 amplifier for improved signal reception.
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Supported Systems: GPS, BD2, BD3, GALILEO, GLONASS
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Use Case: Ideal for space-constrained applications or projects where simplicity and compactness are priorities.
Unit-GPS SMA
The Unit-GPS SMA stands out with its external active antenna connected via an SMA interface, offering enhanced signal reception in challenging environments. This makes it a reliable choice for applications requiring robust signal performance.
Key Features
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Chip: AT6668
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Antenna: External active antenna (SMA connector)
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Interface: UART
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Signal Amplification: N/A (relies on external antenna performance)
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Supported Systems: GPS, BD2, BD3, GALILEO, GLONASS
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Use Case: Perfect for environments with weak satellite coverage or where stronger signal reception is essential.
Key Differences
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Antenna Configuration:
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The Unit-GPS SMA features an external active antenna connected via an SMA port, providing better signal strength.
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The GPS/BDS Unit v1.1 uses an integrated ceramic antenna, making it compact and easy to integrate.
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Signal Reception:
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The Unit-GPS SMA excels in weak-signal areas due to its external active antenna.
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The GPS/BDS Unit v1.1 is better suited for environments with reliable satellite signals.
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Form Factor:
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GPS/BDS Unit v1.1: Compact, all-in-one design.
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Unit-GPS SMA: Slightly bulkier due to the external antenna.
| Parameter | GPS/BDS Unit v1.1 (AT6668) | Unit-GPS SMA |
| Model | GPS/BDS Unit v1.1 | Unit-GPS SMA |
| Chip | AT6668 | AT6668 |
| Antenna Type | Built-in ceramic antenna | External active antenna (SMA connector) |
| Interface | UART | UART |
| Supported Satellite Systems | GPS, BD2, BD3, GALILEO, GLONASS | GPS, BD2, BD3, GALILEO, GLONASS |
| Signal Amplifier | MAX2659 | None |
| Form Factor | Compact design with integrated antenna | Larger, requires external antenna connection |
| Ideal Use Case | Space-constrained projects | Challenging environments with weak signals |
