Fmcw Short-range Detection System Signal Detection And Processing

This dissertation introduced the work principle and characteristics of FMCW (fequeney modulated continuous wave) radar, educed the linearity relation between difference frequency signal and target distance, specify the whole scheme of FMCW short measure distance system. Combined the principle of FMCW and digital signal processing, it has carried out signal processing system software and hardwave design.In the hardware design, the digital signal processer of TMS320VC5410 is the core of the system. It includes in details that AD9833 finishes the modulated signal producer, filter and amplifier finish the preprocessing of difference frequency signal, AD convertor TLC5510 and FIFO accomplish data sampling, SST39LF400A is made use of programme and data memory. Besides that it also includes system electrical sourse, clock and other periphery circuits design.According to the system of the signal processing request, this design completes the overal system software which includes producing modulated signal, data collection, signal analysis in time field and frequency field, FLASH burned and Bootloader programme. This paper does some simulates and analysis in wavelet denosing of threshold. And bring forward wavelet transform to measure signal freguency, achieve the function of short range detection.Finally, combine software and hardware and debug the whole system, analysis the result of the debug. Validate the signal processing system design scheme.