同时设计了数字正交通道，进行数字混频和数字滤波。
At the same time, it designs the digital orthogonal channels for digital mixing and filtering.
然后介绍了数字化中频处理中的采样理论、正交混频解调、滤波抽取等基础理论。
The basic theory of IF signal processing, such as sample theory, quartered demodulating technology, filtering, draw-off and interpolating theory is discussed.
该方法利用通常的线性调频RCS测量系统进行信号采集；信号处理则采用本文介绍的正交相关数字混频器。
The chirp system, which is commonly used for RCS measurement, is utilized to collect data and a method of orthogonal digital correlation mixer is suggested to process the sampled data.
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