频率分集阵列接收机结构设计及方向图分析

Frequency diverse array receiver architecture design and pattern analysis

针对频率分集阵列(FDA)存在的发射方向图与接收方向图不聚焦、波束时变等问题,给出了三种FDA阵列接收机设计方案.在接收机设计中,基于频域滤波器和正交波形设计,实现了接收端各阵元信号的分离,解决了发射方向图与接收方向图在期望位置不聚焦的问题;通过二次下变频,消除了接收方向图的时变项,解决了方向图的时变性问题.理论推导及仿真结果表明该接收机结构的双程方向图处理增益、主副瓣比及主瓣驻留时间等主要性能指标均优于相控阵结构.

Three receive architectures were designed to improve the time-varying and the inconsistent between the transmitting and receiving pattern for frequency diverse array.The proposed architectures eliminated the mismatch between patterns in the expected position through separating the signals from different elements by frequency filter or the orthogonal waveform design.The time-varying of the beam was also alleviated as the time-variable factor was removed by the second down-conversion.Theoretical derivation and computer simulations show that both three architectures perform better than FDA-phased in gain,main-side lobe ratio and dwell time.