CAJ | 학술논문

常规脉冲压缩处理只针对单根天线单一载频单次回波,对于MIMO雷达,由于发射采用多载频信号,回波信号通道分离后若能进行带宽合成,则相应距离分辨率会比单根天线提高数倍,有利于后续检测与跟踪.针对MIMO雷达设计中调频带宽和载频差的不同选取,分别采用时频域频谱拼接及频谱外推与Root-MUSIC算法相结合的方法,得到目标高分辨距离像.仿真结果验证了该方法的正确性.
상규맥충압축처리지침대단근천선단일재빈단차회파,대우MIMO뢰체,유우발사채용다재빈신호,회파신호통도분리후약능진행대관합성,칙상응거리분변솔회비단근천선제고수배,유리우후속검측여근종.침대MIMO뢰체설계중조빈대관화재빈차적불동선취,분별채용시빈역빈보병접급빈보외추여Root-MUSIC산법상결합적방법,득도목표고분변거리상.방진결과험증료해방법적정학성.
Conventional pulse compression use a periodical echo of single receive antenna, which is modulated by a certain carrier-frequency, in other words, single spectrum is exploited. But for MIMO radar, as the multi-carrier-frequency signals are transmitted simultaneously, if the spectrum of the target echo after channel separation can be combined to form the whole band spectrum echo, the corresponding range resolution can improve several times as compared with the conventional method, and it will be more convenient for follow-up detection and tracking. Considering the difference between the frequency modulation band and the interval between the adjacent frequencies, the spectrum joint after channel separation will be overlapped or spaced. The methods of spectrum moving of each echo and the spectrum extrapolation with Root-MUSIC algorithm are proposed, by which high-resolution range profile of the target is obtained. Simulation results verify the validity of these methods.