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直接数字合成技术（Ｄｉｒｅｃｔ Ｄｉｇｉｔａｌ Ｓｙｎｔｈｅｓｉｓ，缩写 ＤＤＳ）是近年来迅速发展起来 的一种新型信号合成技术。由于采用了全数字结构，它具有合成信号相对频带宽、频率转换 时间短、频率分辨率高及合成信号相位连续、可产生宽带正交信号和易于集成等优点。阐述 了ＤＤＳ的基本原理，讨论了其在雷达新技术中的应用，并通过对其理想模型的谱分析，得出 了在工程设计中对低通滤滤器的几个制约条件。
Direct Digital Synthesis (DDS) is a new signal synthesis technology developed rapidly in recent years. Due to the all-digital structure, it has the advantages of relative signal bandwidth, short frequency conversion time, high frequency resolution and continuous phase of the composite signal, resulting in wideband orthogonal signals and easy integration. The basic principle of DDS is expounded, its application in new radar technology is discussed, and some limitations of low-pass filter in engineering design are obtained through spectral analysis of its ideal model.