The Applied Research Of DSP In Radar Life Detection System

China is one of the most active earthquake and disaster losses area in the world, many types of buildings collapsed, landslides, mudslides and other disasters have occurred frequently. So, the use of advanced rescue equipment, rapid search to survivors, emergency rescue capabilities, improve disaster reduction is an important measure for loss, for the protection of people's lives and build a harmonious society, and safeguarding social stability has great significance.The subject developed radar detection system is mainly based on the life principle of Doppler. When radar wave penetrated some obstacles and encountered the body, signal was modulated by human life activities (such as breaithing, heartbeat, etc.), some parameters (such as frequency, phase) of the signal Changed. We can extract life relevant characteristics information from the echo signal after properly dispose. Thus, we know whether life is existence under ruins, rabble, buildings without touch the body. This approach overcome shortcoming of the traditional life detection equipments which is vulnerable to outside interference. It can be Apple to rescue injured person timely after collapse, avalanche, earthquakes and other disasters, as well as psychological evaluation and anti-terrorism areas and so on.The life detection system contains three parts, which is radar antenna, on-site detection device and remote monitor and control PDA. The on-site detection devices contains transceiver module and DSP-based pretreatment system, TMS320C5509A is the core of pretreatment system, it take charge of real-time signal sample and processing after demodulation. Remote monitor and control PDA is the handset for the rescue staff. PDA can access data from the on-site detection device through the RS232 interface, and also can control the on-site detection device.Pretreatment system completes real-time data sample and processing efficiently, depend on the powerful real-time digital signal processing and computing of the DSP. Completed the hardware and software design of the low-frequency data sample and processing system, and achieved the expected target and requirement. The system which has the merit of high integration, small volume, light weight and easy to carry, has a good prospect and practical value.