Fixing the spectrum width of the weather echo signals, we change theirs mean Doppler frequency and filter them using regression filter. After filtering, we analyze the attenuation of them.
在天气回波信号谱宽固定的情况下，通过改变天气回波信号的平均多普勒频率，分析了回归滤波器对它的衰减情况。
Analyze and compare a variety of technologies of frequency synthesis, analyze the principle, structure, spectrum and characteristics of direct digital synthesis.
分析比较了各种频率合成技术的优缺点，重点分析了直接数字式频率合成器的原理、结构、频谱以及特点。
Requirements for the characteristics of frequency response of the noise transducer are put forward so as to analyze the actual spectrum structure of noise.
为了客观地反应噪声信号的频谱结构，对井下噪声换能器的频谱响应特性提出了一定的要求。
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