| Life detection radar plays a very important role in many fields,and the use of radar for life detection-related research is also getting more and more attention.Because people are trapped in a small space and cannot carry out large-scale activities,this article is mainly based on the detection of human targets in a static state.When a person is at rest,based on the Doppler effect caused by his breathing and heartbeat,detection,positioning and twodimensional planar imaging are performed.In this paper,the working principle and echo of SFCW life detection radar are analyzed and modeled accordingly.On this basis,the principle of positioning imaging and the research of related algorithms are analyzed.The echo signal not only contains the distance information of the target,but also has strong clutter interference.In order to better obtain the target information and suppress the clutter signal,this article is one-dimensional IFFT processing,MIMO multi-channel,MTI and MTD,Related researches on constant false alarms,life signal detection and recognition,etc.,followed by related studies on target positioning and imaging methods,combined with practical applications,perfected the signal processing flow of life detection radar.According to the signal processing requirements of the life detection radar,the system composition of the life detection radar is determined,and the software and hardware implementation scheme of the system is introduced.According to the design plan,combined with project requirements,the system is divided into modules.The entire system includes four parts: RF front-end,data acquisition and timing control,display and control platform,and power supply module.According to the requirements of the project,the function of the radar and the selection of step frequency parameters were analyzed and designed in detail.It provides a basis for the further realization of the hardware.According to the division of system modules,each module is analyzed and designed separately.Determine the transmitter plan according to the project index requirements,and combine the requirements of the project to determine that the receiver system is a zero-IF receiver;the data transmission between the transmitter receiver,digital signal processing and timing control and display control platforms are respectively detailed The design includes the relationship between interfaces,timing control,protocol description,etc.The data acquisition and processing is based on Xinlinx FPGA.The display and control platform is realized by industrial control module and touch screen;it adopts rechargeable battery to power the whole system,which can be used outdoors and portable,and the continuous working time is up to 6 hours.Through the analysis and design of the signal processing system of the life detection radar,the software and hardware of the signal processing are finally realized,and a life detection device with multiple transmissions and multiple receptions has been developed. |
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