【摘要】 对于单天线FMCW雷达系统,由于它利用一个天线去发射和接收信号,大功率的发射信号会泄露的接收支路,首先,强泄露信号会使接收机前端的低噪声放大器饱和,其次,发射机噪声泄露的接收机将引起接收机灵敏度下降,最后,强的泄露会造成接收机产生虚假目标。针对这一问题本文提出了一种基于DSP的自适应射频对消系统,并分析了系统中可能存在的问题,最后进行了系统中数字部分的算法仿真证明了理论分析的正确性。更多还原

【Abstract】 Frequency modulation continuous wave( FMCW) radar system with a single antenna transmit and receives signals with the same antenna; therefore high power transmitted signal would leak to receiving channel.Firstly,strong leakage signal will saturated low noise amplifier( LNA) in front- end of receiver. Secondly,sensitivity of the receiver will decrease due to noise of transmitter leaked to the receiver. Finally,strong leakage signal will make the receiver generate false target. To solve this problem,an adaptive RF cancellation system based on digital signal processing is proposed; problems may exist in this system are analyzed. Algorithm simulation to digital part proves the validity of the theoretical analysis.更多还原