摘要:
相位差是影响信号分辨的一个重要因素。当采样率足够高时,研究在分数阶傅里叶变换域两个线性调频(linear frequency modulation, LFM)信号的相位差与调频率分辨率的约束关系。通过建立调频率的分辨模型,推导出在两个LFM信号可分辨范围内相位差的上界和下界,只有当相位差处于上界和下界之间时,两个LFM信号才可以分辨。仿真结果表明,分辨率的理论值与实际值之间偏差较小,基本吻合。
冯志成, 安建平, 卫景宠. FRFT域LFM信号的调频率分辨率与相位差的关系[J]. Journal of Systems Engineering and Electronics, 2011, 33(10): 2194-2197.
FENG Zhi-cheng, AN Jian-ping, WEI Jing-chong. Relationship between chirp-rate resolution of LFM signals and phase difference in FRFT domain[J]. Journal of Systems Engineering and Electronics, 2011, 33(10): 2194-2197.