摘要
非相干散射雷达可以对多种电离层等离子体重要参数进行测量,但回波信号极其微弱,为了提取到有效的电离层参数,现代非相干散射雷达采用了复杂的编码方案,导致雷达回波信号分析提取变得非常困难。针对这一问题,提出了采用雷达模糊函数理论来改善雷达编码信号的分析。交替码是现代非相干散射雷达常用的一种编码方式。结合非相干散射信号探测基本原理及模糊函数理论,对交替码的模糊函数进行了仿真研究。分析了码形在编码方式,距离分辨率及信息含量方面的优缺点,并对交替码的波形处理进行了研究。仿真结果表明,交替码编码方式复杂,信息含量大并具有较高的距离分辨率,抗噪性强,适用于变化较快的电离层偶发E层。
Incoherent scatter radar can measure a variety of ionospheric plasma parameters, but the radar echo sig- nal is very weak. To solve this problem, the theory of radar ambiguity function is put forward to improve analyze of these complex signal coding. Alternating code is one of the most commonly used coding methods of modern incoherent scatter radar. According to the basic theory of incoherent scatter radar ambiguity function, the simulation of ambiguity function of the alternating code was carried out. The advantages and disadvantages of the code about encoding mode, distance resolution and signal content were analyzed. In addition, the simulation of alternating code waveform process- ing was conducted. Simulation results show that the alternating coding method is complex ,with high information content, high range resolution, and strong anti -noise,which can apply to ionosphere sporadic E laver.
作者
姚明
管炜
左铭
YAO Ming GUAN Wei ZUO Ming(School of Information Engineering, Nanchang University, Nanchang Jiangxi 330031, China Institute of Space Science and Technology of Nanchang University, Nanchang Jiangxi 330031, China)
出处
《计算机仿真》
北大核心
2017年第10期17-21,68,共6页
Computer Simulation
关键词
非相干散射雷达
模糊函数
交替码
Incoherent scatter radar
Ambiguity function
Ahernating code
