The invention discloses a method for awakening an emergency broadcast through a Beidou
system, a DTMB
set top box and a
system, and the method comprises the steps that a Beidou short message receiving module and a Beidou short message decryption and analysis module obtain an emergency message from a Beidou short message broadcast
signal, wherein the emergency message comprises an emergency instruction and emergency information, and the emergency information is a receiving parameter of an emergency broadcast DTMB program; a DTMB receiving module obtains a DTMB program from the DTMB broadcast television
signal; a first control module receives the emergency message, executes an emergency instruction, wakes up the DTMB
set top box in advance for a necessary time period, and transmits the emergency message to the main control module which receives program video and audio data; and the main control module sets receiving parameters of the second DTMB receiving module according to the emergency information, converts the emergency broadcast content into a
media type, synthesizes the emergency broadcast content and outputs the emergency broadcast content. According to the invention, the emergency message in the Beidou short message broadcast
signal is detected and received in real time, and the DTMB
set top box is awakened to carry out emergency broadcast.