采用模拟低通滤波器降低频谱混叠，提高谐波检测的实时性。
Simulating low pass filter is adopted to reduce the spectrum alias and improve the speed of harmonic measurement.
方法：用数学方法求解对应于低分辨率遥感图像的统一频谱混叠。
Methods: the mathematic method is used to find a uniform expression for frequency aliasing matrix of different resolution images.
分析了CCD的非线性产生频谱混叠问题，提出了减小频谱混叠的方法。
The overlapping spectrum caused by the nonlinearity of CCD was analyzed, and the way of reducing overlapping spectrum was presented.
从信号中去除高频信息，降低抽样频率而不导致频谱混叠的过程称之为抽取。
Filtering the high frequency part of the signal and reducing the sampling frequency, which does not produce the aliasing, is called sampling.
在数字正交采样中，带通信号存在频谱迁移问题，虽然满足带通信号的采样定理，仍可能产生频谱混叠。
For bandpass signal under digital quadrature sampling, there is spectrum shifting. Although the sampling frequency satisfies the sampling theorem, it may cause spectrum aliasing.
实验结果表明，该方法可有效地突破最大物参角的限制，同时可以消除由于欠采样造成的频谱混叠现象。
The experimental results show that the method can overcome the limitations of the critical angle between the object and reference beams, and omit the frequency aliasing.
文章利用抽样定理，首次由频谱的混叠导出物理上可实现的第一类部分响应形成滤波器特性。
By using Sampling Theorem, the paper first deduce the characteristics of the first class partial response shaping filter that can be realized on the physical from the spectrum overlap.
该方法从理论上可能的最小采样频率出发，根据采样后频谱不发生混叠的3种约束条件来确定可变的频率步长，搜索可用的最小频率。
The method starts with the theoretically minimum frequency and searches for the minimum valid sampling frequency using variable step sizes subject to three non-aliasing constraints.
利用频谱解混叠方法和空间域迭代重建方法对低分辨率图像帧数大于等于4帧时的重建效果进行了研究。
The result of reconstructing a HR image is studied when the quantity of LR images is more than or equal 4 by using the spectral de-aliasing algorithm and the spatial iterative algorithm separately.
利用频谱解混叠方法和空间域迭代重建方法对低分辨率图像帧数大于等于4帧时的重建效果进行了研究。
The result of reconstructing a HR image is studied when the quantity of LR images is more than or equal 4 by using the spectral de-aliasing algorithm and the spatial iterative algorithm separately.
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