正交检波方法既能给出灰度超声成像所需要的回波的幅值信息，也能给出多普勒超声成像所需要的回波的相移信息。
Orthogonal detection can give us both the amplitude information for gray-scale imaging and phase shift information for doppler spectrum analysis.
正交相干检波可以将复包络的所有信息进行保留，所以在数字信号处理中得到广泛应用。
Quadrature coherent detection can reserve all information of the complex envelope of signals, and it is therefore widely used in signal processing.
正交相干检波保留了信号复包络的所有信息，因而在信号处理中得到了广泛应用。
The quadrature coherent detection is widely used in signal processing field, since it can reserve all information of the complex envelope of signal.
正交相干检波可以保留信号复包络的所有信息，因而在信号处理领域中有广泛的应用。
The quadrature coherent detector is widely used in the field of signal processing since it can reserve all information about the complex envelope of IF signal.
正交相干检波是雷达、声纳和通信等系统中为数字信号处理提供高质量的正交信号的关键技术之一。
The coherent quadrature detector is one of the key technologies for providing high quality quadrature signal for digital signal processing in radar, sonar, communication and other systems.
传统的正交相干检波器由模拟器件构成，存在较大的镜频误差。
When it is realized by using the analog devices, the conventional quadrature coherent detector may result in the large image frequency errors.
本文讨论了用直接对带限中频信号进行采样的方法来实现正交相干检波的基本原理，它们在工程实际中有很大的实用价值。
The principles of realizing quadrature coherent detector by direct sampling of bandlimited signal are discussed in this paper. They have great practical value in engineering.
本文讨论了用直接对带限中频信号进行采样的方法来实现正交相干检波的基本原理，它们在工程实际中有很大的实用价值。
The principles of realizing quadrature coherent detector by direct sampling of bandlimited signal are discussed in this paper. They have great practical value in engineering.
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