摘要
逆合成孔径雷达(inverse synthetic aperture radar,ISAR)需要发射宽带信号,在与频率扫描阵列联合应用时,由于频率扫描阵列各阵元间馈线产生的相位差不能匹配发射或者接收信号频率的变化,因此该阵列在进行ISAR成像时对信号瞬时带宽有较大的约束。针对上述问题,将频率分集成像技术应用在频率扫描阵列上,通过不同时刻发射不同频率单频信号合成宽带,并且频率变化适用于频率扫描阵列的波束指向调节。该方法既能形成波束指向目标,又可以克服频率扫描阵列发射宽带信号时的限制,完成ISAR二维成像。在建立该方法的基础上,还针对阵列参数与目标航迹参数等对成像的影响进行了分析。结果表明,所提的频率分集ISAR成像技术,可在频率扫描阵列上实现对运动目标的二维成像。
Inverse synthetic aperture radar(ISAR)needs to transmit broadband signals.When combined with frequency scanning array,because the phase difference generated by the feeders between the elements of the frequency scanning array can not match the change of the transmitted or received signal frequency,the array has great constraints on the instantaneous bandwidth of the signal during ISAR imaging.In order to solve the above problems,frequency diversity imaging technology was applied to frequency scanning array.By transmitting single frequency signals with different frequencies at different times,broadband was synthesized,and frequency variation was suitable for beam pointing adjustment of frequency scanning array.This method can not only formed the beam to point at the target,but also overcomed the limitation of the frequency scanning array in transmitting broadband signal,so as to complete the ISAR two-dimensional imaging.On the basis of this method,the influence of array parameters and target track parameters on imaging was analyzed.The results show that the proposed frequency diversity ISAR imaging technology can achieve two-dimensional imaging of moving targets on the frequency scanning array.
作者
施兴相
廖可非
贾新迪
SHI Xing-xiang;LIAO Ke-fei;JIA Xin-di(School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China;State and Local Joint Engineering Research Center for Satellite Navigation and Location Service,Guilin University of Electronic Technology,Guilin 541004,China)
出处
《科学技术与工程》
北大核心
2021年第35期15101-15107,共7页
Science Technology and Engineering
基金
国家自然科学基金(61631019)
广西科技厅项目(桂科AD18281061,桂科AA21077008)
广西无线宽带通信与信号处理重点实验室基金。
关键词
逆合成孔径雷达
频率分集
成像技术
频率扫描阵列
inverse synthetic aperture radar
frequency diversity
imaging technology
frequency scanning array