李道京1,,,
周凯1, 2,,
王宇1,,
洪峻1,
1.中国科学院空天信息创新研究院微波成像技术重点实验室 北京 100190
2.中国科学院大学 北京 100049
3.西安电子科技大学电子工程学院 西安 710126
基金项目:国家部委基金，中国科学院空天信息创新研究院课题(Y910340Z2F)
详细信息
作者简介:崔岸婧(1997–)，女，中国科学院大学博士生。研究方向为阵列天线与信号处理。E-mail: ajcui@qq.com
李道京(1964–)，男，中国科学院空天信息创新研究院，研究员，博士生导师，研究方向为雷达系统与雷达信号处理。E-mail: lidj@aircas.ac.cn
周凯：周 凯(1995–)，男，中国科学院大学博士生，研究方向为信号与信息处理。E-mail: zk_6810@163.com
王宇：王 宇(1976–)，男，中国科学院空天信息创新研究院，研究员，研究方向为机/星载SAR定标，定量遥感应用。E-mail: wangyu@mail.ie.ac.cn
洪峻：洪 峻(1960–)，男，中国科学院空天信息创新研究院，研究员，博士生导师，研究方向为SAR定标技术、定量化SAR图像应用等。E-mail: jhong@mail.ie.ac.cn
通讯作者:李道京 lidj@aircas.ac.cn
责任主编：廖桂生 Corresponding Editor: LIAO Guisheng中图分类号:TN951
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出版历程
收稿日期:2020-06-18
修回日期:2020-09-13
网络出版日期:2020-10-12
Research on the Method of Composing Very Low Frequency Signals Based on the Staggered Array
CUI Anjing1, 2, 3,,LI Daojing1,,,
ZHOU Kai1, 2,,
WANG Yu1,,
HONG Jun1,
1. National Key Laboratory of Microwave Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Science, Beijing 100049, China
3. School of Electronic Engineering, Xidian University, Xi’an 710126, China
Funds:The National Ministries Foundation, The Aerospace Information Research Institute, Chinese Academy of Science (Y910340Z2F)
More Information
Corresponding author:LI Daojing, lidj@aircas.ac.cn
摘要
摘要:10 kHz量级甚低频电磁波信号具有较强的地物穿透能力，可用于地质勘探。由于其天线尺寸在10 km量级，其应用场合受到限制，研究基于适当尺寸高频雷达天线的甚低频电磁波信号产生方法具有重要意义。该文提出基于高频阵列天线产生甚低频信号的概念，利用阵列天线合成产生近光速远离运动雷达多普勒信号，实现信号频率的大幅降低。给出了发射波形、交错阵列设计和阵列参数选择方法。将周期脉冲串信号作为辐射单元信号，增大合成信号脉宽。利用阵列产生的脉宽展宽量填补脉冲信号的休止期，在目标区合成时间连续的甚低频信号。采用峰值旁瓣比(PSLR)、积分旁瓣比(ISLR)、阵列发射信号与合成信号的频谱对比评价合成低频信号的性能和发射信号的能量利用率。该文仿真了百米量级阵列100 MHz辐射单元信号在目标区合成10 kHz甚低频信号的情况：9行阵列构成交错阵列、辐射单元信号脉宽设置为0.115 μs时，合成信号频谱的峰值旁瓣比和积分旁瓣比分别为–13.34 dB和–9.44 dB, 10 kHz低频信号在合成信号中的能量占比为89.79%。该文分析了辐射单元间距误差、辐射单元信号时间、相位与幅度误差以及目标偏离预定位置的影响。仿真结果表明了该文方法的有效性。
关键词:频率变换/
电磁波多普勒效应/
交错阵列/
周期脉冲串信号/
甚低频信号
Abstract:The Very Low Frequency (VLF) signal of 10 kHz has strong penetrability of ground objects. Because of the antenna size, its application is limited. Therefore, it is important to study the VLF signal generation method based on appropriately sized high frequency radar antennas. The concept of generating VLF signal with high frequency array antenna is proposed in this paper. The waveform of the emission signal, staggered array structure design, and array parameter selection methods are presented and discussed. The pulse width of the composite signal is increased by using periodic pulse signals as radiation element signals. The resting period of the pulse signals is filled with the pulse width expansion generated by the array and the VLF signal with continuous time is composed in the target area. The performance of the composite VLF signal and the energy utilization of the emission signal are evaluated using Peak SideLobe Ratio (PSLR), Integrated SideLobe Ratio (ISLR) and through the spectrum comparison between the emission signal and the composite signal. With the 10 kHz VLF signal composed by 100 MHz radiant element signals, the hundred meter array is simulated. When the staggered array is constituted by nine arrays and the pulse width of the radiation element is set to 0.115 μs, PSLR and ISLR of the composite signal spectrum are –13.34 dB and –9.44 dB respectively, and the energy proportion of 10 kHz low-frequency signal in the composite signal is 89.79%. The effects of radiation element spacing error, time error, phase error and amplitude error of the radiation element signal and the target’s deviation are analyzed. It is found that the proposed method is an effective one and the simulation results have illustrated the effectiveness.
Key words:Frequency transformation/
Electromagnetic Doppler effect/
The staggered array/
Periodic pulse train signal/
Very Low Frequency (VLF) signal
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