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本文计算了递归型DMTI(数字动目标显示)级联DFT(离散Fourier变换)装置输出噪声的功率谱分布,并在此基础上分析了由于采用递归型DMTI装置而引起的信噪比损失。计算结果表明,这种损失在无杂波区内很小,且当DMTI所用的单极点网络的级数增加时,这种损失增加得并不明显。同时,这种级联装置输出噪声功率谱是均匀的,适于雷达信号处理系统采用。
In this paper, the power spectral distribution of the output noise of the cascaded DFT (discrete Fourier transform) device of the recursive DMTI (Digital Moving Target Display) is calculated, and on the basis of this, the loss of signal-to-noise ratio due to the recursive DMTI device is analyzed. The calculated results show that this loss is small in the clutter-free region, and this loss does not increase appreciably when the number of unipolar networks used in the DMTI increases. At the same time, this cascaded device output noise power spectrum is uniform, suitable for radar signal processing system.