基于STM32单片机的电波钟设计

电波钟系统以STM32为控制核心，通过自制磁棒天线接收中国码，经选频放大以及单片机解码得到实时时间数据，从而在液晶显示器上显示完整时间。系统采用太阳能系统供电，能够输出稳定的恒压电源，附加秒表计时器、倒数计时器与信号强度检测，经5个独立按键控制实现相关控制功能。整个系统使用AGC提高信噪比，显示信号强度，并在此基础上尽可能降低整机能耗，从而提高供电续航能力。天线性能是影响电波钟系统的重要性能，当场强为1．0mV／m时，工作状态优良，时码信号十分清析；当场强为0．5mV／m时，工作状态正常。选频放大模块测试显示系统整体的灵敏度较高，显示模块的测试数据显示通过定时关闭背光能有效降低功耗。

Design of radio controlled clock based on STM32 microcomputer

The radio controlled clock system which was using STM32 MCU as the control core and receiving Chinese code through the self made rod antenna displays the full time on the LCD monitor and obtains the real time data by MCU decoding after frequency selection amplified. The system power supplied by solar energy systems with stopwatch counter timer,digital countdown timer and signal strength detection could output stability constant power. The whole system improved signal to noise ratio adopted by AGC and displayed signal strength while reducing overall energy consumption as much as possible in order to improve power endurance. The performance of the antenna is an important influence on the performance of clock radio system, the system works excellently with clear time code signal while the field strength is 1.0mV/m and works normally while the field strength is 0.5 mV/m. The test of selecting frequency amplifier module shows that the whole system has high sensitivity while the testing data of display module shows that the system can reduce the power consumption effectively with turning off backlight by timing.