摘要
为了提高距离分辨率而又不增加对发射/接收机带宽的要求,该文提出了频分多入多出(Frequency-Divided Multiple Input Multiple Output,FD-MIMO)雷达。该雷达利用同时发射的多路窄带信号合成宽带波形,进而得到目标的高分辨距离像。由于持续时间短,合成高分辨距离像具有很好的多普勒容限。此外,针对由合成频谱不连续性造成的近区高旁瓣和由子带间耦合造成的远区高旁瓣,该文分别提出使用倒数谱滤波器和对子带信号加带外衰减的方法予以抑制。最后,理论分析和数值仿真证明了旁瓣抑制方法的有效性。
A Frequency Divided Multiple Input Multiple Output （FD-MIMO） radar is proposed, which can synthesize the High Range Resolution Profile （HRRP） by transmitting and receiving narrowband waveforms in different frequency bands without over-demanding system bandwidth. And thanks to short pulse duration, the HRRP of FD-MIMO radar has good Doppler tolerance. But the synthesized HRRP suffers from high-level sidelobes near and far from the mainlobe caused by the discontinuity of the synthesized spectrum and the interferences between the subband waveforms respectively. To suppress them, the reciprocal spectrum filter is applied and the out-of-band attenuation of each subband waveform is utilized. Finally, numerical experiments show the effectiveness of the presented methods.
出处
《电子与信息学报》
EI
CSCD
北大核心
2008年第9期2033-2037,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60502012)
国家部委基金(9140A07020106JW0103)资助课题
关键词
频分多入多出雷达
模糊函数
高分辨距离像
倒数谱滤波
Frequency Divided Multiple Input Multiple Output （FD-MIMO） radar
Ambiguity function
High range resolution image
Reciprocal spectrum filter
