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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.
In order to solve the problems that the transmit diversity pattern (DOF) of the frequency diversity array (FDA) does not focus on the receive pattern and the time-varying beamforming, three kinds of FDA array receiver designs are given. In the receiver design, Cross wave design, to achieve the receiver signal separation of the various elements to solve the transmission pattern and receive the direction of the map does not focus on the desired position; through the second down-conversion to eliminate the receiving time-dependent time-varying terms to solve The time-varying problem of the directional pattern is analyzed.The theoretical derivation and simulation results show that the performance of the receiver such as the two-way directional pattern processing gain, the main-sidelobe ratio and the mainlobe dwell time are all superior to the phased array structure.