The DDS technique is mainly described, and the basic principle and the composition of the signal simulator are introduced with a complex structure strata echo signal.
同时重点介绍了DDS技术，并以结构复杂的地层回声信号为例介绍了信号模拟器的基本原理及构成。
By comparison with simple shape targets, the echo strength of the complex targets versus frequency and range is more complex.
与简单形状目标相比，复杂目标的回声强度随频率和距离的变化更为复杂。
A complex structure signal simulator designed by DDS technique is introduced. It can simulate several kinds of strata echo waves or complex structure signals.
介绍了一种利用DDS技术设计的复杂结构信号模拟器，它可以模拟多种地层回声或复杂结构的信号。
In this case when used to describe the complex spectra with echo signal measurement, which is the forefront of digital signal processing one of the topics.
本例用来说明复时谱在具有回声信号测量中的应用，这是数字信号处理的前沿课题之一。
It is difficult to theoretically calculate the laser scattering echo energy from rough surface of whole dimension target for complex environment in actual application.
由于实际环境的复杂性，理论计算大尺寸复杂目标粗糙表面的激光散射回波能量影响一直十分困难。
The complex data samples are directly extrapolated to obtain the extrapolated echo data in the frequency domain.
对于频域，直接对散射场回波复数据进行外推，可获得外推散射场。
The complex data samples are directly extrapolated to obtain the extrapolated echo data in the frequency domain.
对于频域，直接对散射场回波复数据进行外推，可获得外推散射场。
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