frequency modulation spectrum

基本解释

With transient frequency modulation estimation, the widened Doppler spectrum may not only be narrowed but also the Doppler shift compensated.
通过相位补偿有效地抑制了电离层扰动造成的多普勒谱展宽和频率漂移。
This paper presents an introduction to the network structure, transmission method, frequency spectrum distribution scheme, modulation and multiaddress connection technology concerning HFC.
介绍混合光纤同轴接入网（HFC）的网络结构、传输方式、频谱分配方案和调制与多址连接技术。
It takes statistical samples used for estimation of transient frequency modulation making the Doppler spectrum widening from different range bins, which are independent of distance each other.
该算法利用雷达回波谱中海浪在空间上的独立性来获取统计样本，因而在无需对雷达系统作任何改动的情况下，可获得对电离层扰动瞬时频率变化的统计估计。