The GPS system is based on 24 positioning satellites around the world and provides three-dimensional position, three-dimensional speed and other information around the world.
I developed a lot of GPS tracking devices with RF/BT modules such as U-BLOX NEO-M8Q, NEO-6M, SARA-R410 4G LTE, SARA-U201 GSM/GPRS, SIM868, SIM7000C, M66, M26, L96, and FGPMMOPA6H. In these projects, I was responsible for analog/digital circuit design, PCB design, firmware programming, and mechanical design. And I co-worked with developers who work on sever building and mobile app.