最常见的数字信号处理技术之一是离散傅立叶变换（DFT），它把一个信号分解成它的组成频率，并表示成一个矩阵。
One of the most common digital-signal-processing techniques is the discrete Fourier transform (DFT), which breaks a signal into its component frequencies and can be represented as a matrix.
合成孔径雷达(SAR)图像相干斑噪声滤波技术分成三类：多视处理、统计滤波和变换域滤波。
Synthetic Aperture Radar (SAR) speckle filtering techniques can be classified into three categories: multi-look processing, statistical filtering and filtering in transform domain.
提出了提高精度，同时减少占用内存的数据处理方法和充分利用软件功能在微机上实现近远场变换的技术。
The efficient data processing methods to achieve a high degree of accuracy in transformations and at the same time to reduce the memory capacity are developed.
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