改进的频谱幅度域处理抗干扰技术

提高全球导航卫星系统（global navigation satellite system, GNSS）接收机抗干扰性能出发，对现有的频谱幅度域处理（frequency spectrum amplitude domain processing, FADP）抗干扰算法中的几个关键问题作出改进，设计出一套更为鲁棒实用的FADP方法。首先，将重叠加窗的思想引入到FADP系统框架中，以减小快速傅里叶变换（fast Fourier transform, FFT）的频谱泄露。针对频谱波形和时域波形在幅度统计特性上的差异，设计了更适合频谱处理的幅度域处理（amplitude domain processing, ADP）函数。对ADP的实现进行了简化，使得不再需要进行笛卡尔坐标与极坐标之间的反复转换，降低了计算复杂度。最后，基于GPS C/A码软件接收机平台，将改进后的FADP 方法与原FADP方法进行对比实验，验证了所提方法的有效性。

Anti-jamming technique using improved FADP filter

In order to improve the anti-jamming performance in global navigation satellite system(GNSS) receivers,an improved anti-jamming technique based on frequency-spectrum amplitude domain processing(FADP) filter is proposed,which is more robust.Firstly,an overlap windowed fast Fourier transform(FFT) is used to relieve the spectrum leakage.Then,according to the analysis of the differences between the statistical characteristics of the time-domain waveform and spectrum data,a new mathematical function of amplitude domain processing(ADP) is designed.Meanwhile,a simplification of the procedures save the computation resources in some way.Finally,based on the GPS software receiver platform,experiments comparing the improved FADP with the original FADP verify that the improved method has stronger suppression ability and smaller insertion loss than the orginal one on non-Gaussian interference.