radio digital system 中文意思是什麼

radio digital system 解釋
無線電數字系統
  • 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。
  • digital : adj. 1. 手指的；指狀的。2. 數字的，數據的。n. 1. （鋼琴等的）琴鍵。2. 手指。
  • system : n 1 體系，系統；分類法；組織；設備，裝置。2 方式；方法；作業方法。3 制度；主義。4 次序，規律。5 ...
  1. Drm. digital radio mondial - system specification

    全球數字廣播
  2. Digital intermediate frequency system is one of the hotspots in radio communication and military research, it provided a superexcellent way for high - speed double direction digital communication

    數字中頻系統是當前軍事與移動通信領域的研究熱點之一，它為高速雙向無線數據通信提供了思路與方案[ 1 ] 。
  3. 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。
  4. Sgsn 900 1800mhz tdma digital cellular mobile communication network test method of gprs general packet radio service base station system and serving gprs support node interface

    900 1800mhz tdma數字蜂窩移動通信網通用分組無線業務gprs基站子系統與服務gprs支持節點
  5. This dissertation bases on the research of battlefield armored reconnaissance tank system, which is a very important reconnaissance & information reception means for our country ? digital armored troops. the zzco2 radar armored reconnaissance tank system is the collector of radio information by use of the radiation and reflection of electromagnetic wave, at the same time it is a system which saves, processes and transmits the radar information picked up. the content of this dissertation involves the design and development of zzco2 ? software system

    本論文以我軍裝甲機械化部隊坦克師的戰場裝甲偵察系統的研製為背景撰寫。該系統是我國數字化裝甲部隊的重要偵察和信息獲取工具。其中zzc02型雷達偵察車（型）是該系統的前沿偵察車，是不可見電磁頻段的雷達信息的收集者，是以電磁波輻射、反射作為信息獲取的主要手段，以計算機主機為中心的信息採集、處理、存儲和傳輸系統。
  6. The digital city emergency management system is developed with many states of application technologies which include gsm network communication and locating technology, ism radio frequent communication and orientation technology, rational communication protocol, low power technical application, communication air base collision control, crc correction technology, arm development platform, etc

    摘要通過綜合使用gsm網路通信和定位技術、 ism射頻通信和定向技術、嚴密合理的通信協議、低功耗技術的應用、通信中信息空中碰撞的解決方法、 crc糾錯技術、 arm開發平臺的應用等多項應用技術，完整地構成了人員急救報警服務系統平臺。
  7. On the basis of high speed hybrid filter banks adc system, a kind of downsampler model based on bandpass sampling theorem is presented, and analyzed, proved in time and frequency domain, in addition a downsampler is designed according to the model. a class of high effective hybrid filter banks adc system which bases on the downsampler and radio frequency spectrum is proposed, of which digital signal rate falls m times as fast as the former

    作者提出了一種基於帶通采樣定理的抽取器數學模型，對該數學模型進行了時域、頻域的分析證明后，設計了一種基於該數學模型的抽取器，進而根據無線電射頻信號頻譜的特點，提出了高效混合濾波器組adc系統，其數字信號輸出速率比高速混合濾波器組adc系統降低m - 1倍。
  8. First of all, the development of the digital trunked communication system is summarized, and the technical characteristics of several prevail worldly digital trunked communication systems are compared. in view of the domestic situation, the tetra digital trunked radio communication system is chosen as the studying and developing model. with the study of control technology of softswitch, the protocol of the v + d air interface and the multiple use of channel is analyzed, the base station control unit of the digital trunked communication system is discussed, the calling control flow is designed

    本文首先綜述了數字集群移動通信系統的發展狀況，針對目前國際上流行的數字集群體制的技術特點進行了比較和分析，並根據我國的具體國情選擇了tetra數字集群系統作為研究和開發的重點，結合對軟交換控制技術的研究和分析，對集群系統重要的v + d空中介面協議及其通道復用進行了較為深入的剖析，對數字集群實驗系統的基站控制部分進行了論述，對呼叫控制流程進行了設計。
  9. Tetra ( terrestrial trunked radio ) digital trunked radio communication system is a kind of advanced private mobile communication system and is a radio directed communication system, which can share resource, expenditure and channel equipments, provide kinds of services and have high efficiency

    Tetra數字集群系統是一種高級專用移動通信系統，是共享資源、分擔費用、共用通道設備和服務的多用途、高效能的無線調度通信系統。
  10. The radio surveillance digital system can identify the modulation format and parameters by data acquisition and signal processing in the complicated signal environments with noise

    無線電監測調制識別系統能夠在復雜環境和噪聲干擾情況下對信號採集和處理確定信號各種參數，解調信號，從中獲取信息。
  11. Fixed radio systems - characteristics and requirements for point - to - point equipment and antennas - part 2 - 1 : system - dependent requirements for digital systems operating in frequency bands where frequency co - ordination is applied v1. 1. 3

    固定式無線電系統.點對點設備和天線的特性和要求.第2 - 1部分:頻率協調的頻帶上運行的數字系統的系統相關要求
  12. The basic characteristics, framework, principles of dominant parts and application of those are studied and illustrated. at the last chapter, by devising a short - wave radio station aforementioned fundamental theories are put into practice especially digital modulation, demodulation, ddc and dug etc. the implement framework and design method of sdr are discussed by data transmission of voice including dug modulation in transmit module and ddc demodulation in receive module. moreover, satisfied results are obtained by validation on the sb3410 platform in bluewave system

    針對論文設計中用到的兩個比較重要的器件hsp50214b下變頻器和hsp50215上變頻器，作了較為深入的研究並給出了詳細的描述，包括基本特徵、框架結構、各主要部分原理及在設計中的應用；在最後一章，通過設計一個短波無線電臺，將前面的基礎理論尤其是數字調制、解調及數字上、下變頻等應用於實踐中，通過實例討論話音數據傳輸的軟體無線電實現結構及設計方法，包括發射模塊中的上變頻調制和接收模塊中下變頻解調等，並在bluewave系統的sb3410平臺上運行驗證，取得了較為滿意的結果。
  13. Digital down converter ( ddc ) converts digitized if data into filtered baseband data which can be processed by a standard dsp microprocessor. ddc is a core part of a software defined radio ( sdr ) system

    數字下變頻（ ddc : digitaldownconvert ）是將中頻信號數字下變頻至零中頻且使信號速率降至適宜通用dsp器件處理速率的技術。
  14. Digital radio mondiale - part 1 : system specification

    全球無線電數字傳輸drm .第一部分:系統規范
  15. On the basis of the third kind structure ( the modulator in simulative field ), the paper gave out a method to realize the software radio digital hardware modulator which can perform the function of ask, psk, dpsk, mask, qpsk, dqpsk, qam, oqpsk modulations, using the apparatus of dsp and cpld. the test showed that the modulator can meet the request of system design

    並以第三種結構的數學模型（模擬域的正交調制模型）為基礎，以dsp和cpld器件為核心，進行了硬體電路設計，實現了基於軟擴頻系統的軟體無線電數字硬體調制平臺，實現了多種數字調制方式，其中包括ask ， psk ， dpsk ， mask ， qpsk ， dqpsk ， qam ， oqpsk調制方式。
  16. " following the introduction of digital radio communication system last year and the deployment of two surveillance barges to deep bay in the middle of this year, two hi - tech patrol launches of sophistication will be commissioned today, " he said

    他說：繼去年引入數碼通訊系統及本年中在後海灣設置兩艘監視躉船后，今日再有兩艘設計精良及先進的巡邏警輪投入服務。
  17. A digital trunked radio communications system with voice and data capabilities

    備話音及數據功能的數碼集群無線電通訊系統；
  18. Recent years, with the rapid development of communication, the research of digital trunked radio communication system becomes more and more important

    近年來，隨著通信的飛速發展，作為專用移動通信系統的數字集群通信系統的研究也變得越來越重要了。
  19. Transit and rail industries in many nations have already adopted the digital system as their regular radio communications system. in asia for example, the digital trunked radio system has already been adopted for system expansion or replacement by several organizations. these include the transit northeast line in singapore 1991, the mass transit system smrt in singapore 1998, the high speed railway in malaysia 2000, the guang - zhou subway in china 2000, the west line of guang - jiu railway in china 2000, the peking light railway in china 2001, and the new delhi transit system in india 2001

    據了解現在各國新建捷運路網無線電系統規劃方式，有往數位干線式無線電系統發展之趨勢，並且已成各國捷運及鐵道工業無線電通信的主流標準，以亞洲為例：新加坡捷運東北線（ 1998年） 、新加坡高運量捷運smrt （ 1998年） 、馬來西亞快速鐵路（ 2000年） 、中國廣州地鐵（ 2000年） 、中國廣九鐵路西線（ 2000年） 、印度德里捷運（ 2001年） 、中國北京輕軌系統（ 2001年） .均已於系統擴建或新建時規劃採用數位干線式無線電系統。
  20. Digital radio mondiale - system specification for digital transmissions in the broadcasting bands below 30 mhz

    數字無線電全球化.廣播頻帶低於30hz的數字傳輸用系統規范
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