Why can Japanese mobile phones call the police as soon as North Korea launches missiles?

As we all know, in military early warning, Japan and the United States have built advanced early warning detection systems, mainly including the early warning radar of the Ground Self-Defense Force and the detection system on the Aegis ship of the Maritime Self-Defense Force. The AN/TPY-2 mobile radar and missile early warning satellite deployed by the United States around Japan can basically accurately detect the launch of North Korean missiles. On the civilian side, Japan's J-ALERT and other alarm systems should not be underestimated.

The National Instant Alert System (J-ALERT) of the Fire Department of the Ministry of Internal Affairs and Communications of Japan was put into use in February, 2007, aiming to quickly convey emergency information to the general public in times of crisis. At present, the coverage rate of various regions in Japan has reached 100%. The system is based on artificial satellite to process information. When natural disasters or sudden emergencies occur, it will automatically give an alarm through the ground system and the super bird -B2 communication satellite in space. The warning range includes earthquake, tsunami, volcanic eruption and bad weather information, as well as "national protection warning" such as missile threat, air raid and large-scale terrorism.

As early as many years ago, the Japanese government mandated that mobile phones sold in China must have built-in disaster emergency response function. In this way, the emergency alarm of J-ALERT system can bypass the volume and notification management of mobile phone system, and send out alarm sound and text reminder directly without network data connection. In addition, many third-party applications on mobile phones can also send out instant alarms.

Therefore, as long as the missiles launched by North Korea fly to Japan, the military's missile warning information can be quickly released to relevant areas in Japan, and residents' mobile phones immediately receive real-time alarms. This information-based emergency early warning mode of emergencies is also a direct embodiment of the crisis consciousness of this island country.