合成孔径雷达线性调频信号的线性度约束研究

Research on the Linearity Requirement of LFM in SAR

合成孔径雷达(SAR)发射的信号为线性调频信号,由于受系统的影响,频率和时间并不满足线性关系,可能会发生某种畸变.这样就会存在一个线性度的问题.本文描述了线性度对于调频信号的压缩产生的影响,并且利用压缩信号的特点得到了对于线性度的具体约束,然后通过仿真验证了约束的正确性.

Theoretically, Synthetic Aperture Radar(SAR) should transmit Linear Frequency Modulated(LFM) signal. In practical SAR system, the frequency and time of the signal can't keep linearity absolutely, which is the linearity problem of LFM signal. The linearity affects the resolution of SAR. The effect of linearity on compression of LFM signal is describled. The method for determining the requirement of the linearity is put forward. Simulation experiment prove the accuracy of the method.