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在宽带信号侦察中数字信道化是一个极其重要的环节。当侦察的信号带宽非常宽,需要的数字信道化个数很大时,用一级信道化实现非常困难。其中,大点数、高速率的DFT设计和硬件实现是一个最突出的难点。针对这个问题,提出了一种数字信道化的级联实现结构,把实信号的数字信道化与复信号的数字信道化级联起来,能够大大降低设计难度,并且这种基于模块化的设计便于工程实现。仿真结果证明,这种方法能够有效实现实信号的无盲区、抗混叠的频谱恢复。
Digital channelization in wideband signal reconnaissance is an extremely important step. When reconnaissance the signal bandwidth is very wide, the need for a large number of digital channelization, with a channel to achieve very difficult. Among them, the large number of high-speed DFT design and hardware implementation is one of the most prominent difficulties. In response to this problem, a digital channelized cascade implementation structure is proposed. By cascading the digital channelization of the real signal and the digital channelization of the complex signal, the design difficulty can be greatly reduced. Moreover, the modular design is convenient Project realization. Simulation results show that this method can effectively achieve the real signal without blind zone, anti-aliasing spectral recovery.