radio frequency band 中文意思是什麼

radio frequency band 解釋
射頻頻帶
  • radio : n. 1. 無線電訊[電報，電話]；無線電，射電。2. 無線電廣播；無線電（廣播）臺。3. 收音機。vt. ,vi. 用無線電傳送[廣播]；（向…）作無線電廣播[傳送]；用X射線拍照；用鐳醫治。
  • 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。
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  1. Due to the hardware characteristic ' s limitation, such as the poor speed of a / d, d / a conversion and dsp process, the most part of sr system adopt middle course. that is to say, by using the special digital converter or running relevant arithmetic, it converts the radio signal to intermediate frequency signal and completes the base - band signal process that is n ' t the veriest sr and is named " software defined radio ( sdr ) "

    由於受到硬體性能如a d 、 d a及dsp晶元處理速度的限制，目前的軟體無線電系統多採用折中的實現方案，增加專用的數字變頻器或者運行數字變頻演算法，將射頻信號變頻到中頻，然後再進行基帶信號處理，這樣的軟體無線電系統又被稱之為「軟體定義無線電」 ，它並不是真正意義上的軟體無線電。
  2. The synchronization of frequency hopping method referenced the jtrs radio system of usa military, and designed a synchronization method used in our radio include creating the frequency hopping map and the base band frame architecture in frequency hopping mode. the paper also analyzed the synchronization capability on theory. it has been proved correct on theory by showing the false probability, capture probability and the synchronization time

    對跳頻圖案的產生和跳頻的幀結構，本文不僅從理論上分析了同步性能，給出了虛警概率和檢測概率，估算了同步的捕獲時間，證明均能滿足系統指標要求，而且通過與合作單位進行的整機聯調和實測證實了該方案的可行性。
  3. The scrambling and descrambling technologies include non - disturbing frequency method, analog base band disturbing method, the radio - frequency signal disturbing method, the digital disturbing method for the analog signal and the digital signal disturbing method, etc. after the introduction a project based on the compression of the rf synchronous information is formulated

    本文綜述了目前常用的幾種主要的電視信號的加解擾技術，如非擾頻加解擾技術、模擬基帶加解擾技術、射頻信號加解擾技術、模擬信號的數字處理加解擾技術以及數字信號加解擾技術等。
  4. Either the boron nitride ( bn ) thin films with different cubic phase content were deposited on n - type si ( 111 ) and fused silica substrates by radio frequency ( rf ) sputtering using two - stage deposition process. the films were characterized by fourier transform infrared ( ftir ) spectroscopy. the transmittance te ( ) and reflectance re ( ) were obtained as a function of incident photo wavelengths and the thickness of films was measured by alpha - step. the absorption coefficient was calculated from te ( ) and re ( ). the optical band gap ( eg ) of the films was determined by effective medium form of formula containing eg

    本文還研究了立方相含量與光學帶隙的關系，在n型si （ 111 ）片和熔融石英片上沉積出不同體積分數的立方氮化硼薄膜，薄膜的成分由傅立葉紅外吸收譜標識；用紫外-可見分光光度計測量了沉積在石英片上的bn薄膜的透射光譜te （ ）和反射光譜re （ ） ，薄膜的厚度用臺階儀測得。
  5. Methods of measurement on receivers for satellite broadcast transmissions in the 12 ghz band - radio - frequency measurements on outdoor units

    12ghz頻帶衛星廣播接收機的測量方法.第1部分:露天設備射頻測量
  6. Methods of measurement on receivers for satellite broadcast transmissions in the 12 ghz band ; part 1 : radio - frequency neasurements on outdoor units

    12ghz頻帶衛星廣播接收機的測量方法.第1部分:露天設備的射頻測量
  7. Electromagnetic compatibility and radio spectrum matters - satellite personal locators beacons operating in the 406, 0 mhz to 406, 1 mhz frequency band - part 1 : technical characteristics and methods of measurements v1. 1. 1

    電磁兼容性和無線電頻譜情況.工作在406 . 0 mhz - 406 . 1 mhz頻帶的衛星個人定位器信標.第1部分:技術特性和測量方法
  8. Radio broadcasting systems - very high frequency, frequency modulated, sound broadcasting transmitters in the 66 to 73 mhz band ; english version ets 300750 : 1997

    無線電廣播系統.甚高頻調頻. 6至75mhz無線電廣播電臺
  9. For the sake of making user randomly communicate between gsm900 and dcs1800 networks with a single handset, this thesis devoted to design and realize a rf ( radio frequency ) subsystem for gsm900 / dcs1800 dual band handset according to gsm 05. 05 protocol provided by etsi, which the structure of single board can realize gsm900 / dcs1800 dual band of the handset

    為了使用戶可用一部手機在gsm900 dcs1800兩個移動通信網上自動漫遊通話，本論文根據歐洲電信標準學會（ etsi ）提出的gsm05 . 05協議，設計實現gsm900 dcs1800雙頻段手機中射頻子系統。它單片的實現了手機的雙頻段gsm900 dcs1800 ，而且隨時可以根據網路的需要，實現無縫（不斷線）自動切換。
  10. This paper completes the design of sr system with the radio frequency band - pass sampling architecture and uses rapid system protot ype method to realizes sr system in tfs tms320c6711dsk board. this method of sr research is the paper ' s innovation

    本論文實現了基於dsp硬體平臺的射頻直接帶通采樣軟體無線電的系統級設計，並運用快速原型的方法在美國德州儀器公司（ ti ）的tms320c6711dsk板上實現基於dsp平臺的軟體無線電系統，這主要是一種軟體無線電技術研究方法上的創新。
  11. ( 2 ) a new digital frequency - hopping communication system based on cipher - quasi - chaotic sequence is proposed, which combines the cryptography and frequency - hopping technology. the system ' s protocol, base - band signal processing and modulation / demodulation algorithms of the radio - frequency part are designed, and the hardware experiment conducted on a prototype of the system show that the system functions well. the finite precision problem arising while taking use of chaotic signal to generate pseudo - random sequence is studied and the anti - tracking capability of the cipher - quasi - chaotic sequence is studied with the volterra - tls method proposed in this dissertation

    （ 2提出一種新的基於密碼準混飩序列的密碼與跳頻技術相結合的跳頻通信系統，並且進行了協議部分、拂信號處聊分、射頻調制解調演算法部分的模擬研究和系統的硬體實驗研究；研究了利用混飩信號產生偽隨機序列的有限精度實現問題，利用本文提出的m業肚m 113方法對密碼準混飩序列產生的跳頻碼的抗鵬干擾能力進行了模擬實驗研究。
  12. Sepura was the first company to provide tetra products for the public security 350 - 372 mhz radio frequency band in china and hisense will produce these products from its chinese manufacturing facility

    塞普樂公司是第一家為中國調頻350 - 372mhz公共安全臺提供tetra產品的公司，而海信將用其國產設備生產這些產品。
  13. This paper divides into six chapters : the first chapter - base on the analyses of the origin, conception and development status of sr, this chapter discusses the key technology and realize difficulties of sr and advances the intention and meaning of the paper. the second chaptei - the sr system with radio frequency band - pass sampling architecture is a design scheme close to software wireless radio ( swr ), this chapter introduces three system architecture of sr system and analyses the theory of radio frequency band - pass sampling. the third chapter - this chapter analyses and designs the dsp hardware platform with radio frequency band - pass sampling architecture

    本論文分為六章：第一章在分析軟體無線電的起源、概念、發展概況的基礎上，闡述了軟體無線電的關鍵技術及實現難點，提出了本論文研究的目的與意義；第二章射頻直接帶通采樣軟體無線電結構是接近理想化的軟體無線電設計方案，本章對軟體無線電系統的體系結構及射頻直接帶通采樣原理進行了分析；第三章分析並設計了射頻直接帶通采樣結構軟體軟體無線電系統的dsp硬體平臺；第四章研究了調制解調及信號調制樣式的識別演算法並給出了dsp實現，這是在dsp平臺上實現軟體無線電功能的一種常規方法；第五章分析了應用快速原型技術開發軟體無線電系統的必要性及可行性，完成了軟體無線電系統的matlab模擬及結合ti公司的tms320c6711dsk板的快速原型實現，這也是本論文提出的軟體無線電的一種新的研究方法。
  14. Methods of measurement on receivers for satellite broadcast transmissions in the 12 ghz band. part 1 : radio - frequency measurements on outdoor units

    12 ghz波段衛星廣播發射用接收機的測量方法.第1部分:戶外設備的射頻測量
  15. Fortunately, a novel creative technology, namely multiple - input multiple - output ( mimo ), has provided an innovative solution to this problem. mimo technology utilizes multiple antennas at both transmit and receive ends of the radio link to multiply the capacity and reliability by fully exploiting the space resource within the same frequency band at no additional power expenditure

    可幸的是，多入多出（ mimo ）無線通信技術為解決該問題提供了全新的途徑，它在無線鏈路收發兩端均採用多天線，充分開發空間資源，在無需增加頻譜資源和發射功率的情況下，成倍地提升了通信系統的容量與可靠性。
  16. Chapter 2 introduces the theory of frequency - hopping and omsk, at the same time gives out a fh - gmsk radio model in high frequency band under the matlab simulink environment. chapter 3 respectively proposes the parameter blind estimation algorithms for high - speed - hop and low - speed - hop fh signals based on smoothed pseudo wvd ( spwvd ). furthermore, the simulation results are given to demonstrate the algorithms performance

    第三章用「平滑偽wvd （ spwvd ） 」時頻分析技術分別研究了對高速跳和低速跳的跳頻信號的參數盲估計演算法，並對這兩種演算法，分別在matlab的環境下做了模擬和性能分析。
  17. This paper discusses key technology in the digital intermediate frequency receiver with wide band based on software radio, including down - converter on condition of band - pass - sampling, digital down - converter, multi - rate digital signal processing, band - pass signal decimating, and achieves software system simulation based on under - sampling

    摘要分析了基於軟體無線電的寬帶數字中頻接收機中的關鍵技術帶通采樣下變頻技術、數字下變頻技術、多速率處理技術，並實現了欠采樣技術條件的軟體系統模擬。
  18. This paper investigates the problems about the base - band signal shaping and the multi - rate signal processing of the radio - frequency signal

    本文對基帶信號的成形和射頻信號的多速率處理進行了研究。
  19. Future mobile communication will be wide - band multimedia communication. the adoptive technologies include wideband cdma, software radio, intelligent antennas, ofdm ( orthogonal frequency division multiplexing ) and digital processing device. ofdm and software radio are both the charming technology for future mobile communication

    移動通信的發展趨勢是寬帶多媒體通信，所採用的技術包括寬帶cdma 、軟體無線電（ softwareradio ） 、智能天線（ intelligentantennas ） 、正交頻分復用（ ofdm ）和數字處理設備。
  20. Fixed radio systems - point - to - point antennas - antennas for point - to - point fixed radio systems operating in the frequency band 3 ghz to 60 ghz

    固定無線電系統.點對點天線.在頻率帶3ghz - 60ghz范圍內操作的點對點固定無線電系統
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