two-frequency channel 中文意思是什麼
two-frequency channel
解釋
雙頻率通路-
Company now have independence develop ten many china patent and many independence intellectual property ' s software copyright ' s product ; company major product : cable television consumer management control system ( but look for address 2 - 8 branches allot style, 8 - 32 gather line style ) ; shoot frequently plus unfasten harass system ( crowd plus crowd unfasten, cent two sections, point channel shan unfasten ) ; video frequency number subsections plus unfasten harass system ; cable television network burglarproof sow system ; number cable television product is with number mmds ( microwave ) systematically ; general purpose type prevent thunder supply electric appliances, shoot frequently automate supply electric appliances, but look for address control supply electric appliances ; power supply prevents thunder protection product ; pass flow branch, dispenser, split utensil, cavernous wave utensil, power supply inserts utensil, but transfer attenuator, but transfer equalizer wait for
目前擁有十多項中國專利和多個自主知識產權的軟體版權的產品；公司主要產品：有線電視用戶管理控制系統（可尋址2 - 8戶分支分配式、 8 - 32戶集線式） ；射頻加解擾系統（群加群解、分兩段、按頻道單解） ；視頻數字分段加解擾系統；有線電視網路防盜播系統；數字有線電視產品與數字mmds （微波）系統；通用型防雷供電器，射頻自動控制供電器，可尋址控制供電器；電源防雷保護產品；過流分支、分配器，分流器、陷波器、電源插入器，衰減器、均衡器等。 -
Two simulation algorithms of realization channel characteristic are analyzed emphatically : shaping of slow fading with correlation and generation of frequency - selected multipath fading
重點分析了實現通道特性模擬的兩種演算法：慢衰落的相關性整形和頻率選擇性多徑衰落。 -
Causes small transmission delay, but computation is complex. the other is called dsova, which does not need to know csi, with low - computation complexity and small transmission delay, and is more suitable in the case when side information is unknown. these two algorithms effectively combine the ofdm technology and the sova algorithm in rayleigh channel, resulting in an efficient sova decoding under frequency - selective channel
另一種是不含通道估計的差分sova演算法（簡稱dsova ） ，該演算法不必知道csi ，計算復雜度低，傳輸時延小，適用於邊沿信息（ sideinformation ， si ）未知的情況，這兩種演算法將ofdm技術和rayleigh通道下的sova譯碼演算法有機的結合起來，很好地實現了頻率選擇通道下的sova譯碼。 -
That is, in order to obtain a satisfied communication quality, in every group of beforehand setting channel, by means of link quality analysis ( lqa ) during two side ' s calling, answering and recognizing period, every channel will be arranged in prior order, the best communication channel can be found automatically, and the link can be set in the best frequency so as to raise the level anti - interference, and ensure our army ' s ability in fighting
即為了獲得滿意的通信質量，在預置的各組頻道中，通過雙方的呼叫、應答和確認過程，利用鏈路質量分析（ lqa ） ，自動對電臺所預置的若干個頻率進行線路質量分析，將各頻道按優先排隊，從而自動找出當時最佳通信頻道，並在最佳頻率上建立鏈路，提高抗干擾能力，保障我軍的指揮作戰能力。 -
Frequency sweep flight technique is used to collect the flight data of a model helicopter near its hover and low speed working condition, window frequency spectrum is combined to obtain the frequency response of both lateral and longitudinal channels, then weighted fitting method is utilized to obtain the transfer functions of the two channel
摘要利用掃頻試飛技術獲取了某無人直升機在懸停工作點附近的舵機輸入和直升機動態輸出數據，利用組合窗頻譜分析的方法獲取了直升機橫滾通道與俯仰通道動態的頻率響應特性，利用加權擬合的方法獲取了各自的傳遞函數。 -
In additive white gaussian noise ( awgn ) channel, we introduce a method for synchronization of symbol timing and frequency for two - dimensional spread spectrum system without prior knowledge of spread spectrum matrix
摘要針對加性白高斯噪聲通道，考慮未知二維擴頻矩陣的條件下，提出了一種二維擴頻系統的時頻同步方法。 -
A subspace - based blind channel estimator has been developed for space time coding orthogonal frequency division multiplexing ( stc - ofdm ) system with two transmit antennas and two receive antennas
摘要針對使用2個發射天線和2個接收天線並且採用循環前綴的空時編碼正交頻分復用系統（ stc - ofdm ） ，提出了一種通道盲估計演算法，並給出通道可被辨識的條件。 -
This system is based on two altera ’ s statixii series fpga chips ep2s180f1020c5, and the tunner dtt7579 and the chip ad9433, together composed the main hardware platform. the hardware description system running on the fpga is the core of digital down converted sysgtem, synchronization system, estimation and equalization of channel system, 3780 - point fft ofdm demodulation system, frequency equalization system and ldpc decoding
以兩片altera公司的stratixii系列ep2s180f1020c5級聯為基礎構建了系統主硬體處理平臺，結合湯姆遜公司的調諧器dtt7579以及ad9433組成了系統的硬體構架fpga可描述硬體系統的核心任務包括數字下變頻，同步和通道均衡與估計， 3780點fftofdm解調，頻域均衡， ldpc解碼。 -
The 2503ah power analysis instruments come with preprogrammed configurations for electronic ballast testing, several 3 phase and motor test configurations. you may configure the 2503ah - 3ch as 3 independent power analyzers, or as the most advanced 3 phase analyzer. for electronic ballast testing, one channel may be set up to measure line input dais, while the other two channels measure the high frequency signals
Xitron儀器已為電子鎮流器測試制訂速度與準確度的新標準，高速fft處理器能將鎮流器測試時間縮減可高達75 % ，測試參數包括效率，功率因素，失真及個別的諧波內容， 2503ah系列可完全支援iec - 555符合測試，亦為先進的測試實驗室，測試系統製造商及全球三大照明產品製造商所廣泛採用 -
Single chip needs too much time to calculate and we ca n ' t detect power quality real time for example, and the sampling rate must synchronize the signal frequency. when sample multi - channel signal in turn, it must have time delay between two samplings, so the phase angle difference between each channel signal is ca n ' t be avoid and so on. those problems must be solved
本課題分析了目前電能質量的各種檢測方法，認為快速傅氏演算法（ fft ）是首選方法，但是基於定時采樣的fft計算會產生頻譜泄漏，為了減少這個泄漏需要進行加窗處理，這需要增加采樣數據，導致顯著增大計算量。 -
The telemetry delays for each tool have been standardization as channel alphabetical letters. so the telemetry gauge and interface circuit of tools are designed in this paper. the temperature data of the new kind of telemetry tools has special format consisting of an 8 bit digital temperature wore over an 8 frame time period for its high frequency and the data of flowmeter is uplinked on two time dot to determine downhole or uphole rotational direction
本文重新設計了新型遙傳短節和參數測量儀器的介面電路，部分參數的介面電路完全採用硬體電路實現；針對溫度參數的數據頻率高於新型遙傳方式可傳輸頻率范圍的矛盾，提出了按「位」傳輸的新方式；基於流量參數特有的方向性，對流量數據採用了兩道傳輸的方式。 -
A switch ic for analog signal processing is designed and implemented, which can fulfill the functions of sampling, weighting, controlling and summing of high frequency analog signals. the circuit consists of three parts : four channel analog switches, a voltage reference and the control circuitry. each analog switch is comprised of two high - transconductance n - mosfets with high w / l ratio, which realize the fine tuning and coarse tuning of the input signal respectively
本文研究並設計了一種可對高頻信號進行取樣、加權、控制、疊加的模擬信號處理丌關集成電路，它包括模擬開關、電壓基準源和移位寄存器三個功能模塊，通過兩個高寬長比的高跨導nmos晶體管實現權值的粗調和微調。 -
Moreover, the canceling technology of two microwave signals with same frequency is applied in microwave rfid system firstly, and the method for improving the isolation between the transmitting channel and receiving channel is obtained
首次成功地將同頻相消技術應用於微波rfid系統中，提出了閱讀器收發通道隔離度的改進措施。 -
The theoretical results are evaluated by simulation. if the coherent bandwidth of channel doesn ’ t exceed the occupied bandwidth of two chips, with the increase of delay spread of the channel, mc - ss - cldd exhibits a better performance to make the system resistant to frequency - selective fading
研究結果表明，多載波擴頻碼片級差分檢測在單用戶和多用戶情況下，均適合於時變頻率選擇性衰落通道，並具有抵抗頻率選擇性衰落的能力。 -
The two - channel 53131a counter offers 10 digits per second of frequency period resolution and a bandwidth
只要在顯示器上星號落在冒號之間，一眼就能判定測量合格 -
The two - channel agilent 53131a frequency counter is our most popular - with the ability to make frequency, frequency ratio, time
Agilent 53131a擁有每秒10位數的頻率解析度500 ps的時間 -
In the subsystem of the receiver, to get i q two - channel digital signal, return signal was perpendicular sampled at intermediate frequency
在接收機子系統中，採用了中頻直接正交采樣來完成對信號的i 、 q雙通道的分離。
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