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da wan news this year marks the 93rd anniversary of the september 18th incident. at 9:18 on september 18, the main urban area of ​​chizhou and all counties and districts conducted a unified test of air defense alarms, with more than 50 sirens in the city sounding at the same time. many netizens are curious about how the air defense alarms in various places sounded at the same time? on the morning of september 18, da wan news reporters came to the main control room of the air defense alarm test and drill activities of the chizhou national defense mobilization office, interviewed relevant staff on the spot, and learned about the entire process of the air defense alarm test.

air raid sirens

cui kai, chief of the combat readiness construction section of the chizhou municipal defense mobilization office, introduced that according to the legal provisions of the civil air defense law, the broadcast of air defense alarm signals shall be approved by the civil air defense department and implemented by the county-level government or above. the test of the air defense alarm was approved by the chizhou municipal government, and the chizhou municipal defense mobilization department issued a notice to the whole society through traditional and new media one week in advance. according to the scheduled plan, starting at 9:18 am on september 18, advance alarms, air raid alarms and all-clear alarms will be sounded in various parts of the city in turn, each of which will sound continuously for 3 minutes and end at 9:31.

beidou-3 central station

according to reports, this year chizhou broadcast the alarm signal through 26 satellites connected to the beidou-3 central station. the staff set the broadcast time and signal type in advance, and transmitted them to the satellite through the beidou-3 central station, and then sent them to more than 50 air defense sirens in chizhou by several satellites, so that the air defense alarm signal can be broadcast at the same time, replacing the previous manual broadcast method and avoiding time errors. "for us, this is also the first time that the air defense alarm signal can be broadcast by beidou-3."

beidou alarm control system (image processed)

a relevant person in charge of the chizhou city national defense mobilization office said that the annual air defense alarm test is aimed at reminding the general public to remember history, not forget national humiliation, continuously enhance national defense concepts and civil defense awareness, improve air defense risk avoidance and self-rescue and mutual rescue capabilities, mobilize the people and social forces to actively participate in air defense operations, and build a comprehensive protection system.

da wan news reporter