frequency modulated 中文意思是什麼

frequency modulated 解釋
頻率調制的
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • modulated : 改變了的
  1. By analysis, two kinds of caq are found : one is width - modulated countable pulse series, the other is frequency - modulated countable pulse series. furthermore, the method of generating caq is described and its double features is also proved

    通過分析找到兩種計數型模擬量：調寬計數脈沖串和調頻計數脈沖串，同時本文也闡述了計數型模擬量的產生方法，並進一步驗證了它的二象性特徵。
  2. Based on the method, this dissertation deals with several kinds of signals including cosine wave ( cw ), linear frequency modulated ( lfm ) and multi - component signal, furthermore the systematic comparison of estimation effect among cwt and several other usual methods as well cramer - rao bound ( crb ) is given

    基於上述方法，文中分別對單頻矩形脈沖信號、線性調頻脈沖信號以及多分量信號進行了瞬時頻率估計，並與其他幾種常用瞬時頻率估計方法的性能以及crb進行了系統比較。
  3. The united signal for the isar signal processing is called the cross - range dimension signal. the cross - range dimension signal of the target with nearly tangent motion is a linear frequency modulated signal

    由推導的準切向運動目標的方位向信號的相位表示式可以看出，此信號近似為線性調頻信號。
  4. According to the target distance ( 5 ~ 50m ), a c - band transceiver for ranging was presented in this thesis. the focus of this work was on designing a c - band frequency - modulated continuous - wave ( fmcw ) frequency source, a receiver and microstrip antenna

    本文針對所探測目標的距離（ 5 ~ 50m ） ，研製了c波段測距收發前端，主要包括c波段調頻連續波（ fmcw ）頻率源，接收電路以及微帶天線。
  5. The thesis firstly analyzes the signal form of frequency modulated interrupted continuous waveform ( fmicw ) in theory, studies the principles of detecting range and velocity for fmcw, and further discusses the essential processing methods of the fmicw signal form, including the range transform processing method based on the strict corresponding relation between time and frequency domain, the velocity doppler transform, the digital beam forming

    本文首先從理論上分析了在高頻地波超視距雷達所用的線性調頻斷續波信號的形式，研究了fmcw雷達測距測速原理，並深入地探討了fmicw信號的基本處理方法以及具體的演算法，主要包括距離變換中採用的時間波門相關處理方法，速度多普勒變換，數字波束形成。
  6. Linear frequency modulated ( lfm ) signals as the most popular pulse compression signal are a typical kind of time - varying, nonstationary signals, so applying the wigner - ville distribution into lfm signals has more advantages than conventional methods

    雷達脈沖壓縮技術中所使用的線性調頻信號是一類典型的時變非平穩信號，採用時頻分析的研究方法處理線性調頻信號有著傳統方法無法比擬的優點。
  7. Equipment and components used in cabled distribution systems primarily intended for television and sound signals general specification for frequency modulated stereo and monotonic modulators

    電視和聲音信號的電纜分配系統設備與部件調頻立體聲和單聲道調制器通用規范
  8. Methods of measuring and expressing the performance of radio receivers for sound broadcasting - measurement on frequency - modulated receivers of the response to impulsive interference

    無線電廣播接收機性能測定及表示方法.第5部分:調頻接收機脈沖干擾響應測量
  9. Briefly, here are main topics of this dissertation : ( 1 ) the relation between the resolving power of the linear frequency modulated continuous wave radar and the linearity of linear frequency modulation signal

    同樣，輸出數據也可以通過雙口ram和pci介面輸出。本文的主要工作包括： （ 1 ）介紹了線性調頻雷達距離分辨力和調頻線性度的關系。
  10. Continuous single tune jamming is an effective jamming to linear frequency - modulated radar. however it can not suppress signal output after being full of the sidelobe suppress filter of the jammed bi - phase coded radar, no matter how great the power of it may be

    單頻正弦波干擾對線性調頻雷達是一種有效干擾，但對於二相編碼雷達無論具有多大的功率在充滿二相編碼雷達接收機的旁瓣抑制濾波器后也不能壓制信號主瓣，因此是一種無效干擾。
  11. Radio broadcasting systems - very high frequency, frequency modulated, sound broadcasting transmitters ; english version ets 300384 : 1995

    無線電廣播系統.甚高頻調頻的聲音廣播發射機
  12. In this dissertation, at first, introducing the theory of linear frequency modulated continuous wave radar. the designing of the signal processing hardware platform is basing on the algorithm

    在本文中，首先介紹了線性調頻雷達的工作原理和相關的理論，根據這些演算法要求，來設計信號處理的硬體平臺。
  13. In present, our country had many achievements in research in linear frequency modulated continuous radar, but if we want to turn those achievements into practicality application, it need one efficiency hardware platform

    當前國內對線性調頻雷達的研究也取得了許多成果，但是要把這些研究成果轉化為工程應用，卻需要一個有效的硬體平臺。
  14. We modulate the amplitude of the continuous single tune jamming by noise and produce the continuous noise - modulated jamming. this kind of jamming is effective to pc radar including linear frequency - modulated radar and bi - phase coded radar

    在對單頻正弦波進行噪聲調幅后形成的噪聲調幅干擾對線性調頻雷達和二相編碼雷達都是有效干擾，其干擾特性和射頻噪聲干擾類似。
  15. Linear frequency modulated continuous wave ( lfmcw ) radar has many characteristics of simple structure, small volume, light weight, low cost, low transmitter peak power, short wavelength, thus it is especially suitable to be used in radar image, research of target characteristic, end control and guide, battlefield spy, scene watch etc. and more people in the world interested in it, it will have a wide prospect

    線性調頻雷達具有結構簡單、體積小、重量輕、造價低、發射峰值功率低、波長短等一系列優點，特別適合於雷達成像、目標特性研究、末制導、戰場偵察和場面監視等領域，目前已受到國內外的廣泛重視與研究，應用前景十分誘人。
  16. In order to obtain high range resolution, the chirp signal is used as subpulse to form stepped frequency modulated radar signal

    摘要為了獲得高距離解析度，將線性調頻信號作為子脈沖構成調頻步進雷達信號。
  17. Theoretical model of self - mixing interference in a linear frequency modulated laserdiode is presented by using the dynamic theory of semiconductor laser with weak external optical feedback. the characteristics of oscillation frequency shift and output power changes of the laser diode are analyzed by using the theoretical model. the absolute distance from front facet of laser diode to target can be found by measuring spectrum of output power of the laser diode

    使用半導體激光器在弱反饋條件下的動力學理論，建立了線性調頻半導體激光器的自混頻干涉理論模型.基於該模型，分析了激光器振蕩頻率偏移與輸出功率變化特性.通過測量激光器輸出功率譜，可以得到激光器前端面與被測目標之間的距離
  18. Abstract : a software method of frequency - modulated signal demodulating based on wavelet packet is proposed in this paper. a variety of frequency - modulated signals are analyzed in time - frequency domain and the spectrograms are presented. this method can detect instantaneous frequency effectively and get frequency - modulated information, can be widely applied to dynamic testing and software radio

    文摘:提出了基於小波包的調頻波解調方法，通過對各種調頻信號進行時頻分析，給出了信號的時間?頻率譜圖，能有效地檢測到瞬時頻率和獲取調頻信息，該方法可廣泛應用於動態測試和軟體無線電等領域。
  19. Yasuyuki ikeda, satoru yoneyama, motoharu fujigaki, et al. absolute phase analysis method for three dimensional surface profilometry using frequency modulated grating, society of photo - optical instrumentation engineers [ j ]. opt eng, 2002, 42 ( 5 ) : 1249

    周聰玲.基於快速標定方法的三維物體表面輪廓測量系統的研究[ d ] .天津:天津輕工業學院. 2002
  20. Frequency modulated continuous wave synthetic aperture radar ( fm - cw sar ) can be miniaturized, and it is fit for light - duty flight platform wonderfully

    調頻連續波合成孔徑雷達可以實現小型化，能非常好地滿足輕型飛行平臺對成像設備的要求。
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