全相位FFT在SFAP抗干扰算法中的应用

介绍了一阶空频自适应处理(SFAP)算法的实现方式，指出SFAP中截断FFT操作会造成频谱泄露，分析了频谱泄露对SFAP算法抗干扰性能的影响。本文中采用加窗处理抑制频谱泄露，并提出将全相位FFT(apFFT)应用到SFAP算法，对加窗处理后的SFAP抗干扰性能进行了仿真研究。仿真结果表明，截断FFT会造成频谱泄露，加入不同的窗函数能够有效抑制截断FFT造成的频谱泄露，从而不同程度地提升输出信干比(SIR)。相比传统的窗函数，全相位窗能够更好地抑制频谱泄露，更大程度地提升SFAP处理后的SIR。

Application of all-phase FFT in SFAP algorithm with anti-jamming

The realization of the first order Space-Frequency Adaptive Processing(SFAP) algorithm is proposed and the spectrum leakage is caused by the truncated FFT operation in SFAP. The effect of spectrum leakage on the anti-jamming performance of SFAP algorithm is analyzed. Adding window is adopted to suppress the spectrum leakage and the all-phase FFT(apFFT) is applied to the SFAP algorithm. The anti-jamming performance of windowed SFAP algorithm is simulated and studied. The simulation results show that spectrum leakage would be caused by the truncated FFT and it can be effectively suppressed by the addition of different window functions so that the output Signal to Interference Ratio(SIR) can be improved to different degrees. Compared to the traditional window function, the spectrum leakage can be better suppressed by the all-phase window function and a greater improvement in the output SIR can be obtained.