FM (Frequency Modulation) broadcast based low power consumption high accuracy network time synchronous circuit

The invention discloses an FM (Frequency Modulation) broadcast based low power consumption high accuracy network time synchronous circuit. The FM broadcast based low-power consumption high accuracy network time synchronous circuit comprises a basic time synchronous module, a low power consumption signal processing module and an accurate time synchronous module; the basic time synchronous module is provided with a real-time clock chip; the real-time clock chip sends an interrupt pulse signal before and after hours to wake up the low power consumption signal processing module; the low power consumption signal processing module receives the interrupt pulse signal and sends to and wakes up the accurate time synchronous module, receives a sound signal of the accurate time synchronous module, performs A/D (Analog/Digital) sampling and sends to an hour signal to the basic time synchronous module after sampling data is processed to achieve time synchronization; the accurate time synchronous module is wakened up after receiving the interrupt pulse signal, receives an FM broadcast signal, demodulates the FM broadcast signal to a sound signal and send to the low power consumption signal processing module. The FM broadcast based low-power consumption high accuracy network time synchronous circuit is used for time synchronization in the wireless senor network, is low in hardware cost, wide in utilization range, low in power consumption, high in accuracy and long in utilization time.