随着系统向大带宽、高分辨率、信号处理实时化的方向迈进，回波的数据率越来越高，因此对实时成像处理系统提出了更高的要求。

With the system towards the large bandwidth, high-resolution, signal processing real-time direction, SAR raw signal has a high data rate, so a higher demand is raised to real-time imaging system.

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导出了信号截获因子与信号参数的关系，认为大的时间带宽积是低截获概率信号的必要条件。

The relation between the interception factor and signal parameters is deduced. Large time bandwidth (TB) product is a necessary condition for an LPI signal.

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受限于DDS芯片的调频转换速率，在大带宽下，DDS产生的线性调频信号相比理论信号可能存在频率失真。

Compared to the theory signal, the chirp produced by DDS under large bandwidth, may have frequency distortion due to the limited chirp-rate.

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