雷达通信一体化接收机的设计

Design of radar-communication integration receiver

以综合射频系统中通信信号的接收为背景,对宽带数字信号的接收技术进行了研究。文中对多相滤波结构进行了改进,采用了数字正交下变频法,在下变频的同时实现了正交解调,并且避免了采用传统的下变频方法产生的高频率数字本振。在宽带信号处理时,将通信信号对应的子信道通过频率搬移到基带,之后进行了多倍抽取和滤波处理,最终实现雷达与通信信号的分离。通过仿真可以证实,通信信号经过抽取滤波处理后,频域波形没有发生混叠,得到的通信信号频谱也没有失真,该接收机的设计是合理可行的。

Taking the reception of communication signals in integrated radio frequency systems as background,the technology of receiving wideband digital signals is studied.The structure of the polyphase filter is improved in this paper.The digital orthogonal down-conversion method is adopted,and the quadrature demodulation is realized at the time of down-conversion,and the high-frequency digital local oscillator generated by the traditional down-conversion method is avoided.In wideband signal processing,the sub-channel corresponding to the communication signal is shifted to the baseband by frequency,and then multiple decimation and filtering processing are performed to finally separate the radar from the communication signal.Through simulation,it can be confirmed that after the communication signal is subjected to decimation filtering,no aliasing occurs in the frequency domain waveform,and the obtained communication signal spectrum is not distorted.The design of the receiver is reasonable and feasible.