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针对建立在快速傅里叶变换(FFT)的基础上只在频域之中作变换的传统MIMOTDCS,抗线性调频干扰(LFM)信号能力弱,无法对其有效地应对和剔除等问题,引入分数阶傅里叶变换(FRFT)。首先对电磁环境采样并估计出LFM干扰信号的各个参数,然后作相应阶次的分数阶傅里叶变换,在FRFT域内剔除干扰并生成相应的MIMO-TDCS基函数,从而达到收发两端联合主动躲避LFM干扰的目的。仿真结果表明,利用FRFT对信号良好的能量聚焦特性将线性调频干扰平稳化处理,能够有效地躲避LFM干扰的影响,为MIMO-TDCS抗非平稳干扰开辟了一条新思路。
For the traditional MIMOTDCS based on Fast Fourier Transform (FFT) only transform in the frequency domain, anti-LFM signal ability is weak and can not be effectively dealt with and eliminated, Order Fourier Transform (FRFT). Firstly, the electromagnetic environment is sampled and the parameters of the LFM interference signal are estimated. Then, the corresponding order fractional Fourier transform is used to remove the interference in the FRFT domain and generate the corresponding MIMO-TDCS basis functions, so as to achieve the joint initiative To avoid the purpose of LFM interference. The simulation results show that using FRFT to smooth the LFM interference by the signal’s good energy focusing characteristics can effectively avoid the influence of LFM interference and open up a new idea for non-stationary interference of MIMO-TDCS.