LoRa GPS HAT Raspberry Pi 3 擴展板 915 MHZ

LoRa是一款為IoT和IoT應用而創造的廣域網絡無線射頻技術，WiFi和BLE的連接範圍在室內通常是幾十米，室外幾百米，而LoRa的範圍達到數千米， Lora的低通信成本和低功耗與廣受歡迎的易於部署的開源軟硬件Arduino結合使用是最佳選擇。

Dragino Lora / GPS_HAT  是用於LoRaWan和Raspberry Pi的GPS的擴展模組，是專門為樹莓派用戶所推出的 LoRaWAN 解決方案。板子包含了SX1276 / SX1278收發器 與L80 GPS通訊模組（基於MTK MT3339核心），可以輕鬆被使用通過串行端口到樹莓裨連接的GPS諸如定時應用或一般應用的應用程序需要GPS信息。

Lora / GPS HAT的收發器具有LoRa™長距離調製解調器，可提供超長距離擴頻通信和高抗干擾能力，同時最大限度地減少電流消耗！Lora / GPD HAT以低成本達到極高靈敏度，適合各種要求穩定性高的與廣的應用做結合，在範圍、抗干擾與耗能上都比傳統的模組更加優秀。

通過  AlwaysLocate™  技術，Lora / GPS HAT可以根據環境和運動條件自適應調整開/關時間，實現定位精度和功耗之間的平衡。

除此之外，Lora / GPS HAT還可以使用存儲在內部記憶體中的星曆數據，自動計算和預測軌道（最多3天），因此即使在低功耗的室內信號水平下，HAT也可以快速精準的固定位置。GPS還支持 自動天線切換功能，可以自由切換內建天線與外接天線之間，並在切換過程中仍然保持定位。

The Dragino Lora/GPS_HAT is a expension module for LoRaWan and GPS for ues with the Raspberry Pi.This product is intended for those interested in developing LoRaWAN solutions.

The Lora/GPS HAT is based on the SX1276/SX1278 transceiver.The add on L80 GPS (Base on MTK MT3339) is designed for applications that use a GPS connected via the serial ports to the Raspberry Pi such as timing applications or general applications that require GPS information.

The transceivers of the Lora/GPS HAT feature the LoRa™ long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst minimising current consumption.The Lora/GPD HAT can achieve a sensitivity of over -148dBm using a low cost crystal and bill of materials. The high sensitivity combined with the integrated +20 dBm power amplifier yields industry leading link budget making it optimal for any application requiring range or robustness. LoRa™ also provides significant advantages in both blocking and selectivity over conventional modulation techniques, solving the traditional design compromise between range, interference immunity and energy consumption.

This board can calculate and predict orbits automatically using the ephemeris data (up to 3 days) stored in internal flash memory, so the HAT can fix position quickly even at indoor signal levels with low power consumption.With AlwaysLocate™ technology, the Lora/GPS HAT can adaptively adjust the on/off time to achieve balance between positioning accuracy and power consumption according to the environmental and motion conditions.The GPS also supports automatic antenna switching function. It can achieve the switching between internal patch antenna and external active antenna.Moreover, it keeps positioning during the switching process.

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