描述
在衛(wèi)星通信中,數(shù)據(jù)傳輸速率是性能的重要指標(biāo)。近期的研究發(fā)現(xiàn)衛(wèi)星的平均功耗增加了350%,設(shè)計(jì)壽命從10年增加到近14年,衛(wèi)星的外形和復(fù)雜度也增加了2到5倍。Shin公司的新一代互聯(lián)網(wǎng)協(xié)議(IP)衛(wèi)星iPSTAR總?cè)萘窟_(dá)到了40Gbps,據(jù)稱是現(xiàn)有衛(wèi)星容量的40倍。美國(guó)休斯網(wǎng)絡(luò)系統(tǒng)公司的SPACEWAY每個(gè)點(diǎn)波束的下行鏈路數(shù)據(jù)速率為800Mbps。現(xiàn)代信息技術(shù)需更寬的衛(wèi)星傳輸帶寬。
當(dāng)今正在開(kāi)發(fā)的先進(jìn)寬帶通信衛(wèi)星的設(shè)計(jì)、制造和部署成本都較高。衛(wèi)星設(shè)計(jì)者盡量增加衛(wèi)星的有效載荷能力,以便在投入使用之后能夠最大限度地獲取利潤(rùn)。
對(duì)設(shè)計(jì)衛(wèi)星的工程師來(lái)說(shuō),這意味著:因?yàn)橄冗M(jìn)的通信衛(wèi)星要求最大限度地增加數(shù)據(jù)速率和容量,所以留給設(shè)計(jì)者的誤差余度很小。如果未能分析或者考慮到任何相關(guān)參數(shù)或者真實(shí)效應(yīng),都可能導(dǎo)致設(shè)備性能下降,從而減少收益。與此相反的情況是設(shè)計(jì)過(guò)于縝密,亦即因?yàn)榭紤]了所有未知因素或者按照最
差情況來(lái)設(shè)計(jì)而導(dǎo)致參數(shù)余度過(guò)大,從而增加了不必要的成本、部件、重量和復(fù)雜度。
圖1給出了傳統(tǒng)“彎管”式衛(wèi)星下行鏈路的整體示意圖,它包括了主要的部件,但衛(wèi)星部分只顯示了一個(gè)轉(zhuǎn)發(fā)器圖像。實(shí)際上,一個(gè)衛(wèi)星可能帶有30到50個(gè)轉(zhuǎn)發(fā)器。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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ABB DSQC 320 3HAB 7231-1
ABB DSQC 259 3HAB 2205-1
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