建立了合成孔径雷达回波视频信号模型，提出了一种用AWG520任意波形发生器生成SAR回波视频信号的方法，并用这种方法模拟了SAR实时成像的回波视频信号。

The video signal model for synthetic aperture radar(SAR) is set up, and a method to generate echo signals for SAR using AWG520 arbitrary waveform generator is presented.

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首先，本文对数字频率直接合成(DDS)技术的特点进行介绍，提出一种基于DDS技术的任意波形发生器(AWG)的改进结构。

First of all, this thesis introduces the features of Direct Digital Frequency Synthesis (DDS) technique and gives a new structure of the Arbitrary Waveform Generators (AWG) base on DDS technology.

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为此设计了一种基于多脉冲合成的高精度任意波形发生器，详细地阐述了系统的设计原理，并给出了具体的硬件结构框图。

This paper introduces a design method of arbitrary waveform gene-rator which can gain more precision based on multi-pulses synthesis.

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