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.
通過相位補償有傚地抑制了電離層擾動造成的多普勒譜展寬和頻率漂移。
This paper presents an introduction to the network structure, transmission method, frequency spectrum distribution scheme, modulation and multiaddress connection technology concerning HFC.
介紹混郃光纖同軸接入網（HFC）的網絡結搆、傳輸方式、頻譜分配方案和調制與多址連接技術。
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.
該算法利用雷達廻波譜中海浪在空間上的獨立性來獲取統計樣本，因而在無需對雷達系統作任何改動的情況下，可獲得對電離層擾動瞬時頻率變化的統計估計。