 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 3 | 1/1 | 返回列表 |
| 查看: 1039 | 回復(fù): 2 | |||
人工智能木蟲 (著名寫手)
|
[求助]
英譯漢潤色（航天通信相關(guān)）
|
|
英文原文： NASA’s Evolution to Ka-Band Space Communications for Near-Earth Spacecraft Over the next several years, NASA plans to launch multiple earth‐science missions which will send data from low-Earth orbits to ground stations at 1‐3 Gbps, to achieve data throughputs of 5‐40 terabits per day. These transmission rates exceed the capabilities of S-band and X‐band frequency allocations used for science probe downlinks in the past. Accordingly, NASA is exploring enhancements to its space communication capabilities to provide the Agency’s first Ka‐band architecture solution for next generation missions in the near‐earth regime. This paper describes the proposed Ka-band solution’s drivers and concept, constraints and analyses which shaped that concept, and expansibility for future needs. For over five decades, NASA has launched and operated spacecraft for studying Earth and space phenomena. As both scientific knowledge and instrument technology have advanced during this period, the observation capabilities of these spacecraft have grown as well. The transmission rates and daily volumes of data collected by science probes orbiting the earth have correspondingly increased by several orders of magnitude. As the science data downlink rates have increased, so, too, have the signal bandwidths required to support these transmissions. NASA, like all users of the radio spectrum, must respect frequency allocations established by the International Telecommunications Union (ITU). In ITU parlance, science data downlinks are designated as space-to-earth communications for the Earth Exploration Satellite Service or for the Space Research Service. The ITU has allocated about 5 MHz for such purposes at S-band (approximately 2-4 GHz), 10 MHz for Space Science links and 375 MHz for Earth Science links at X-band (about 7-12 GHz), and 1.5 GHz for direct downlinks and 2.25 GHz space-to-space links at Ka-band (about 19-36 GHz). With growing bandwidths needed to support increasing data rates, downlink designs have evolved over the decades from S-band to X-band, and near-term future needs compel advancing further to Ka-band. In advance of anticipated needs for Ka-band downlinks in the near-Earth region, NASA has developed a design for its networks operating in that region to support corresponding capabilities. This approach leverages three missions, presently under development, as references for understanding relevant needs and constraints for a solution enabling Ka-band near-Earth missions of the future. 我初步翻譯的中文： 美國宇航局近地航天器的Ka波段空間通信的演變 在未來的幾年中，美國宇航局計劃發(fā)射多個地球科學(xué)航天任務(wù)，將以1-3 Gbps的速率從近地軌道發(fā)送數(shù)據(jù)到地面站，以達到每天5-40Tb的數(shù)據(jù)吞吐量。該傳輸速率超過了過去的科學(xué)探測器所使用S波段和X波段的下行能力。因此，美國宇航局正在探索增強其空間通信能力，以提供下一代近地任務(wù)的Ka波段通信架構(gòu)的解決方案。本文介紹了提出的Ka波段解決方案的緣由和概念、約束，并分析概念的形成，以及對未來需求的可擴展性。 在過去的五十年中，美國宇航局已經(jīng)發(fā)射和運轉(zhuǎn)用于研究地球和空間現(xiàn)象的飛船。在此期間，科技和儀器工藝都有所進步，這些航天器的觀測能力也得以增強。繞地科學(xué)探測器的傳輸速率和每日收集到的數(shù)據(jù)量也相應(yīng)增加了幾個數(shù)量級。隨著科學(xué)數(shù)據(jù)下行速率的增加，需要一定的信號帶寬，以支持這些數(shù)據(jù)的傳輸。 與所有其他無線電頻譜的用戶一樣，美國宇航局必須遵循國際電信聯(lián)盟（ITU）劃分的頻譜分配方案。國際電信聯(lián)盟規(guī)定，科學(xué)數(shù)據(jù)下行被指定為用于地球探測衛(wèi)星服務(wù)或空間研究服務(wù)的空-地通信。國際電信聯(lián)盟（ITU）在S波段（約2-4 GHz）分配了約5 MHz用于空-地通信；在X波段（約7-12 GHz），分配了約10 MHz用于空間科學(xué)鏈接，約375 MHz用于地球科學(xué)鏈接；在Ka波段（約19-36 GHz），分配了約1.5 GHz用于直接下行，約2.25 GHz用于空-空鏈接。為支持更高的數(shù)據(jù)傳輸速率，通信帶寬需求日益增長，近幾十年，下行設(shè)計已從S波段發(fā)展到了X波段，在不久的將來，將迫使其進一步發(fā)展到Ka波段。 超過近地區(qū)域Ka波段下行的預(yù)期需求，美國宇航局已經(jīng)制定了其在該區(qū)域的網(wǎng)絡(luò)運作方案，以支持相應(yīng)的功能。這種方法利用了三個任務(wù)，目前正在開發(fā)中，作為理解相關(guān)需求的參考，以及未來Ka波段近地任務(wù)解決方案的限制條件。 要求潤色，謝謝！ [ 來自科研家族 人工智能 ] |
回復(fù)此樓» 猜你喜歡
請問共同通訊和共同一作的認可度問題
已經(jīng)有4人回復(fù)
-
286分調(diào)劑
已經(jīng)有22人回復(fù)
-
材料調(diào)劑
已經(jīng)有4人回復(fù)
-
085600 295分求調(diào)劑
已經(jīng)有19人回復(fù)
-
材料調(diào)劑
已經(jīng)有4人回復(fù)
-
302求調(diào)劑一志愿華中師范大學(xué)
已經(jīng)有3人回復(fù)
-
環(huán)境285分，過六級，求調(diào)劑
已經(jīng)有5人回復(fù)
-
08工科求調(diào)劑290分
已經(jīng)有8人回復(fù)
-
321求調(diào)劑 一志愿 浙江工業(yè)大學(xué)生物醫(yī)藥
已經(jīng)有4人回復(fù)
-
266分，一志愿電氣工程，本科材料，求材料專業(yè)調(diào)劑
已經(jīng)有4人回復(fù)
1251508229
金蟲 (小有名氣)
- 應(yīng)助: 4 (幼兒園)
- 金幣: 951.4
- 散金: 427
- 紅花: 2
- 帖子: 235
- 在線: 34.8小時
- 蟲號: 1782256
- 注冊: 2012-04-27
- 性別: GG
- 專業(yè): 公共管理與公共政策
★
愛與雨下: 金幣-1, 規(guī)則！ 2012-06-06 18:50:42
愛與雨下: 金幣-1, 規(guī)則！ 2012-06-06 18:50:42
|
沙發(fā) [ 發(fā)自手機版 http://www.gaoyang168.com/3g ] |
2樓2012-05-23 06:37:44
人工智能
木蟲 (著名寫手)
- 應(yīng)助: 20 (小學(xué)生)
- 金幣: 5137.8
- 散金: 260
- 紅花: 6
- 帖子: 1204
- 在線: 559.4小時
- 蟲號: 1146496
- 注冊: 2010-11-14
- 性別: GG
- 專業(yè): 人工智能與知識工程
3樓2012-05-23 18:55:40
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 人工智能 的主題更新
| 3 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 0856材料與化工調(diào)劑，339 +13 | 10213207 2026-03-31 | 13/650 |
|
|---|---|---|---|---|
|
|
[考研] 一志愿北交大材料工程總分358 +8 | cs0106 2026-04-01 | 9/450 |
|
|
[考研] 生物學(xué)308分求調(diào)劑（一志愿華東師大） +5 | 相信必會光芒萬?/a> 2026-03-31 | 6/300 |
|
|
|
[考研] 288求調(diào)劑 一志愿哈工大 材料與化工 +30 | 洛神哥哥 2026-03-31 | 30/1500 |
|
|
|
[考研] 26考研調(diào)劑 +3 | Wnz.20030617 2026-04-01 | 3/150 |
|
|
|
[考研] 省雙一流重點一本大學(xué)招收調(diào)劑 +4 | wwwwffffff 2026-03-31 | 7/350 |
|
|
|
[考研] 086000生物與醫(yī)藥 初試274求調(diào)劑 +5 | 小叮當(dāng)來了 2026-03-30 | 6/300 |
|
|
|
[考研] 085701環(huán)境工程，267求調(diào)劑 +17 | minht 2026-03-26 | 17/850 |
|
|
|
[考研] 合肥區(qū)域性重點一本招收調(diào)劑 +4 | 6266jl 2026-03-30 | 8/400 |
|
|
|
[考研] 070300化學(xué)354求調(diào)劑 +15 | 101次希望 2026-03-28 | 15/750 |
|
|
|
[考研] 一志愿中海洋材料357 +4 | 麥恩莉. 2026-03-30 | 4/200 |
|
|
|
[考研] 266求調(diào)劑 +3 | 哇呼哼呼哼 2026-03-29 | 3/150 |
|
|
|
[考研] 085600材料與化工調(diào)劑 +16 | kikiki7 2026-03-30 | 16/800 |
|
|
|
[考研] 293分求調(diào)劑，外語為俄語 +5 | 加一一九 2026-03-31 | 5/250 |
|
|
|
[考研] 085701環(huán)境工程求調(diào)劑 +11 | 多久上課 2026-03-27 | 12/600 |
|
|
|
[考研] 279求調(diào)劑 +12 | j的立方 2026-03-29 | 12/600 |
|
|
|
[考研] 081200-314 +3 | LILIQQ 2026-03-27 | 4/200 |
|
|
|
[考研] 330一志愿中國海洋大學(xué) 化學(xué)工程 085602 有讀博意愿 求調(diào)劑 +3 | wywy.. 2026-03-27 | 4/200 |
|
|
|
[考研] 315調(diào)劑 +4 | 0860求調(diào)劑 2026-03-26 | 5/250 |
|
|
|
[考研] 調(diào)劑 +3 | 李嘉圖·S·路 2026-03-27 | 3/150 |
|