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在分析三角波调制的线性调频信号的基础上，提出了用DDR技术消除速度对测距的影响方法。
On the bases of analyzing triangle wave form modulated LFM, the method of using DDR (Dual Channel Directional Doppler range) technique to eliminate the influence of speed to range is presented.
数字传输系统的品质因数Q—这个新概念可以用于具有各种调制的数字传输系统性能的分析。
The digital transmission system Q factor-a new concept may be used to analyse the characteristics of digital transmission systems with different kinds of modulation.
通过对调制信号作谱分析，以其频谱中是否存在某种故障的特征频率分量来诊断有无该种故障。
The fault is diagnosed by extracting the fault feature component from the frequency spectrum of the modulated signal.
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