星系噪聲 的英文怎麼說
中文拼音 [xīngxìzàoshēng]
星系噪聲
英文
sky noise-
Convolutional coding is a coding scheme often employed in deep space communications and recently in digital wireless communications. it offers an alternative to block codes for transmission over a noisy channel
卷積碼被運用於衛星通信和無線通信系統中，它提供了一種不同於分組碼的在噪聲通道下傳輸信息的一種編碼方案。By calculating parameters including the link length, the azimuth angle, the elevation, the optical power that the inter - satellite optical cdma communication system will receive, the variation range of the azimuth angle and the elevation from the optical antenna of atp are understood well. by analyzing the factors to impact bit - error - rate ( ber ) from the received power, multi - user disturbing, background noise, wavelength, bit rate etc, measures to guarantee high performances of the system are obtained, especially those for smoothing the fluctuation of the received optical power from host platform vibration
分析研究了衛星光cdma通信系統中衛星仰角、方位角和距離，給出了探測器能夠接收到的光功率以及atp子系統捕獲及跟瞄的范圍;對衛星光cdma通信系統性能模型和基於衛星振動系統性能模型的研究，分析了多用戶干擾、接收光功率、背景光噪聲、振動偏差以及碼速率對系統誤碼率的影響，給出了相應的改進措施。First, the structure of the second generation ctdrs isl was discussed in this paper, the characteristic of coverage in the second generation ctdrs by the characteristic of orbit and the simulation model of isl was analyzed then the effect of the isl establishing process analyzed. second, the discussing and analyzing focus on the characteristic of signal during the establishing isl process, establishing the orbit model, the technology of doppler frequency shift capturing and tracking sequence and the effect of background noise, then the theory analyzing the parameters we have just mentioned, and this will support the reference for the implement of project. the simulation and test of the isl of ctdrs and analyzing from theoretical basis to implement of simulation were mainly focused in this paper
其中討論了二代中繼星捕獲跟蹤系統星間鏈路的模擬方案的組成結構，利用軌道特性對二代中繼衛星系統的覆蓋特性進行分析，搭建了星間鏈路的模擬模型，其中包括中繼衛星和用戶衛星在內的軌道模型、星間鏈路模型、用戶星信號調制模型等，並對星間鏈路建立過程的影響進行分析;重點針對星間鏈路建立過程的信號特性，軌道模塊的建立、多普勒頻移技術、背景噪聲影響、載波的捕獲與跟蹤技術等進行了實際參數的設計與理論分析。For the application of direct broadcast satellite ( dbs ), a ku - band high image rejection broadband mixer is designed using ads. it appears predominant performances when compared with common single balanced mixer
針對衛星電視直播接收系統，用ads設計了一個寬頻帶、高鏡像抑制度、低噪聲的ku波段鏡像抑制混頻器，並同普通平衡混頻器進行了對比分析，顯示了其優越的性能。Methods of measurement for radio equipment used in satellite earth - stations ; measurement for sub - systems ; low - noise amplifier ; identical with iec 60510 - 2 - 3 : 1989
衛星地面站無線電設備的測量方法.分系統測量.低噪聲Methods of measurement for radio equipment used in satellite earth stations ; part 2 : measurements for sub - systems ; section three : low - noise amplifier
衛星地面站用無線電設備的測量方法.第2部分:分系統的測量.第3節:低噪聲放大器Methods of measurement for radio equipment used in satellite earth stations - part 1 : measurements common to sub - systems and combinations of sub - systems - section five : noise temperature measurements
衛星通信地球站無線電設備測量方法第1部分:分系統和分系統組合通用的測量第5節:噪聲溫度測量Methods of measurement for radio equipment used in satellite earth stations. part 1 : measurements common to sub - systems and combinations of sub - systems. section five : noise temperature measurements
衛星地面站用無線電設備的測量方法.第1部分:分系統和分系統組合件通用的測量.第5節:噪聲溫度測量Methods of measurement for radio equipment used in satellite earth stations - part 2 : sub - systems measurements - section three : low noise amplifier
衛星通信地球站無線電設備測量方法第2部分:分系統測量第3節:低噪聲放大器This system is classified as national patented product adapted for changan star such kind of minibus, with the merits of compact, good appearance, low noise, low consumption, large cooling capacity and reasonable assignment etc
該系統是國家級新產品，適用於重慶長安「長安之星」系列微型麵包車，具有結構緊湊、外形美觀、噪聲低、功耗小、製冷能力強、製冷量分配合理等特點。This system is classified as national patented product adapted for changan star series minibus, with the merits of compact, good appearance, low noise, low consumption, large cooling capacity and reasonable assignment of cooling, etc
該系統是國家級新產品，適用於重慶長安「長安之星」系列微型麵包車，具有結構緊湊、外形美觀、噪聲低、功耗小、製冷能力強、製冷量分配合理等特點。分享友人