摘要
针对LFM信号高距离分辨率与宽带宽的矛盾,本文提出了一种新的线性调频子脉冲串(LFM burst)信号雷达工作模式。在回波信号处理时,对其先进行子脉冲内匹配压缩,再对各个子脉冲进行脉冲间相参合成,进一步提高雷达的距离分辨率。LFM burst工作模式在不增加系统瞬时带宽的条件下,可以成倍地提高雷达的距离分辨率;相反如果雷达距离分辨率的要求不变,则可以有效降低系统的瞬时带宽。本文提出并论证了LFM burst模式的工作原理,分析了它带来的优点,同时还对多目标回波和动目标多普勒特性进行了讨论。
In order to overcome the conflicts between high range resolution and wide bandwidth of Linear Frequency Modulated (LFM) signal, a new operating mode of radar is suggested. The radar signal is a series of LFM signal-LFM burst. When the echoes return, every burst was compressed with matched filter first. Integration was accomplished later among these bursts to improve the range resolution. LFM burst mode can raise the radar range resolution several times without widening the system bandwidth. On the other hand, the system bandwidth can decrease greatly with the same range resolution. The paper not only brought out the operating theory of this new LFM burst mode, but also concluded its properties. Multi-objects echo and Doppler property of the moving objects are analyzed in detail as well.
基金
国家自然科学基金(NFNS
69896250-2)
星载合成孔径雷达项目资助
关键词
匹配滤波
FFMburst
距离分辨率
工作模式
雷达
Linear frequency modulated burst, Matched filter, Integration of burst, Range resolution, System bandwidth
