The Research On City Security System Based On Intelligent Sensor Network

With the purpose of the protection of security, with the measure of human defense, technology defense, physical defense, the security system with the detection, delay, response is established. With the sustained rapid growth and social progress, the pressure is increasing on security control in the daily management of the city and a major terrorism response, disaster and other emergencies. The prevent means is transforming from the traditional human defense, physical defense to the combination of human defense, physical defense and technology defense. In the Plenum of the CPC Central Committee, "National Economic and Social Development Five-Year Plan’s recommendations" have been considered by the city included the construction of the central alarm monitoring system and all levels of government urban planning, By building a safe and efficient security system, the security of society and people has been supported strongly.This paper analyzes city security developing situation and describes system construction from intelligent sensor, network transmission and centre platform in detail with a city security system.In the meantime, the common problems have been studied in detail. On the false alarm of security system, with guarantee the system has no fail to alarm, we use intelligent sensors to reduce false alarms. On the opposite, with preventing failing alarm, we have proposed PSTN and IP net transit as two routes. And between the sensors and alarm controllers, the repeaters are used. Then the stability of the transit is guaranteed. On the safety of wireless transmission, the frequency hopping and code rolling are used. When the system under the same frequency disturb, it can hop on the other frequency used. And when system is under decode threaten, the code rolling technology is used. As another parts of the paper, the security window is not security, the bad net services, the little capacity of platform and high maintenance cost have been proposed and the solutions have been given, at the same time.