GPS电波钟，51单片机完成GPS校时+电波校时，当GPS无信号时自动进行电波校时。-The GPS clock radio, 51 single-chip GPS school the+ airwaves school when no GPS signal automatically airwaves school.

电波钟 BPC解码，采用51单片机内涵原理图(Radio clock BPC decoding, using 51 single chip connotation schematic diagram)