摘要
从双基地成像系统的模糊函数出发,针对相移键控(PSK)调制信号的特点,引入平均模糊函数的概念。利用求取期望的方式消除码元序列的随机性对系统模糊函数的影响,详细推导了基于PSK调制信号的无源成像系统的广义模糊函数,并通过仿真实验分析了信号波形参数对系统分辨性能的影响。结果表明,PSK调制信号的序列长度和滚降系数对系统分辨性能的影响很小。
The formula of the generalized ambiguity function of passive imaging system using Phase Shift Keying(PSK) modulating signals is derived in detail. Considering the characteristics of signals, the concept of average ambiguity function is introduced to remove the effect of particular sequence of symbols on the ambiguity function. Then the influence of the waveform parameters of the PSK modulating signals on spatial resolution is investigated by numerical simulations. The results indicate that the influence of the length of the symbol sequence and the roll-off factor is very slight.
作者
张磊
碗超凡
刘振星
尹治平
ZHANG Lei;WAN Chaofan;LIU Zhenxing;YIN Zhiping(Academy of Photoelectric Technology,Hefei University of Technology,Hefei Anhui 230009,China;School of Information Science and Technology,University of Science and Technology of China,Hefei Anhui 230027,China;China Aerospace Science and Technology Corporation,Beijing 100048,China)
出处
《太赫兹科学与电子信息学报》
北大核心
2019年第5期861-865,共5页
Journal of Terahertz Science and Electronic Information Technology
基金
国家自然科学基金青年科学基金资助项目(61401140)
关键词
PSK调制信号
无源成像系统
广义模糊函数
分辨性能
PSK modulating signal
passive imaging system
generalized ambiguity function
resolution capability
