... frequency keying method 频率键控法 frequency modulation Doppler 调频的多普勒系统 frequency modulation noise level on carrier 载波的调频噪声电平 ...
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Ionospheric frequency modulation causes spreading of the surface clutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars.
电离层频率调制导致地表面杂波的多谱勒展宽，极大地限制了高频天波雷达的目标探测性能。
On the basis of the principle of range-Doppler coupling of linear frequency modulation signal, a new method of radial velocity estimation for high coupling coefficient is presented.
本文在分析了线性调频信号距离—多普勒耦合原理的基础上，提出了一种高耦合系数条件下径向速度估计的新方法。
Mapdrift algorithm is an autofocusing processing which can get correct Doppler frequency modulation slope in SAR processing.
在SAR成像中，MD算法是一种对多普勒调频斜率进行估计的自聚焦处理过程。
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