使用STM32(cortex-M3核)模拟GPS模块（摩托罗拉产品GT-UT ONCORE）与基站设备交换机通过双串口进行AT指令交互完成授时(cpu之systick产生1pps信号)，测试成功。-Use STM32 (cortex-M3 core) simulated GPS module (Motorola products GT-UT ONCORE) and base station equipment switches through dual serial AT commands in