light antenna 中文意思是什麼
light antenna
解釋
光束導向天線-
Hence, the antenna along the y-axis does not send any light to the observer directly below it.
因此，沿y軸的天線，對y軸正下方的觀察者不發送任何光波 -
There must be a marine casualty happened every 4 days before 1984, the amount of marine casualty happened at this area corresponds to 1 / 7 amount of the whole changjiang " marine casualty, so mariners gave it a name as " mouth of tiger ". due to the specific geographical condition and the extremely representative vessel traffic management of changjiang yingongzhou channel section, many intelligent people began researching and practicing the vessel traffic management of this changjiang " s down - stream complicated channel section from 1980s, at dec 15th 1984 the authority at that time - changjiang yingongzhou channel section previously ; up to the last years of 1980s ministry management administration applied traffic control on changjiang yingongzhou channel section previously, up to the last years of 1980s ministry of communications assigned shanghai marine college, shanghai ship & shipping research institute and changjiang harbor superintendence administration to make feasibility demonstrate about modern vts of zhenjiang traffic control section ; in 1990 dasha radar station which is the first radar vts station with inner river was finished, groped a new way for applying modern radar traffic control of vessel traffic management ; in 1997 the vtms of changjiang " s down - stream from nanjing to liuhekou was completed with connecting net and came into operation formally, meanwhile the signals of dasha radar station were conveyed to vts center by light cable, and then united applying vessel traffic management upon the whole authorized area ; in jun 2001 jiangsu msa made changjiang yingongzhou channel section as the first experimental group of creating " civilized, safe, passable channel activity, updating dasha radar antenna and receive - transmitter building closed - circuit television monitor system, setting uo safety warning board, starting navigational route reformation, carrying out united construction
1984以前這里平均每四天就發生一起海損事故，事故數占整個長江的1 7 ，被行船人稱為「老虎口」 。長江尹公洲航段緣其極為特殊的地理區位條件和極具代表性的船舶交通管理，從上個世紀八十年代初就有識之士開始了這個長江下游最復雜航段的船舶交通管理探索和實踐。 1984年11月15日當時的長江航政管理局在長江尹公洲水域率先施行交通管制；到八十年代末交通部委託上海海運學院、上海船舶研究所和長江港監局聯合開展鎮江交通管制段建立現代化交管系統的可行性論證； 1990年大沙雷達站? ?內河第一座雷達交管站建成，摸索實施現代化雷達交管的船舶交通管理新途徑； 1997年長江下游南京至瀏河口船舶交通管理系統建成聯網投入正式運行，同時將大沙交管雷達信號通過光纜傳輸至交管中心，統一實施全轄區船舶交通管理； 2001年6月江蘇海事局將長江尹公洲航段作為第一批創建「文明平安暢通航段」活動試點航段，更新大沙雷達天線和收發機，著手閉路工業電視監控系統建設，設立安全警示牌，啟動航路改革，開展聯合「共建」 。 -
Waveguide slot antenna is firm, but the cost is too high. the microstrip antenna is light, its cost is low and it is simple to fabricate, so it is a prior consideration at much time
波導縫隙天線比較結實，但是成本太高，微帶天線則重量輕、成本低、易於製造，因此很多時候優先考慮。 -
Product introduction bst - ant - g0 series access product adopts integration design, and synthesizes the antenna rfidreader infrared ray check voice and light alarm and powerful io controller. its read range can up to 120cm, and use for identifying personnel or goods passing in or out the access
Bst - ant - g0系列通道產品採用一體化結構設計，集成天線系統rf讀寫設備紅外檢測聲光報警和功能強大io控制器，讀寫距離可達120cm ，可用於人員貨物通道進出識別。 -
The natural frequencies of the antenna are low and dense because of its large dimension, light mass and large flexibility. dynamic analysis is needed to avoid the coupling motion between the satellite and the antenna. firstly the thesis sets up the dynamics model of the satellite - antenna system based on the hybrid coordinates
由於天線尺寸大、質量輕、柔性大，天線的固有頻率很低且十分密集，為避免天線與衛星的調姿運動產生不良耦合影響，需對大型可展開天線與衛星系統進行剛柔耦合動力學分析，從而為天線的結構設計提供可靠的理論依據。
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