Transcription of 卫星通信系统概述 - Xidian
1 ISN S t llit i ti t Satellite communications 4 2 1 ( 70-80%)2 ( 20-30%) 1 2 2 3 ( ) 1 2 3 3 4 UHF C ku ka 4 Arthur C. Clarke Extra-Terrestrial Relays 1945 Arthur c. clarke,Extra-Terrestrial Relays--Can Rocket Stations Give World-wide Radio Coverage?
2 Wireless World, pages 305-308,October 1945. 1957 10 4 Sputnik I 58 58 4 2017/3/135 1958 12 1960 8 ECHO 1962 7 AT&T TELESTAR-1 1962 7 AT&T TELESTAR1 6 GHz/4 GHz 1962 11 RCA 1 RELAY-1 1964 8 19 3 Syncom 3 y 2017/3/136 1965 MOLNIYA 1965 4 I Intelsat I 2017/3/137 50 kg 5000kg 15 480 2017/3/138
3 1 1 2 3 4 5 6 6 1970 4 173kg 4 1 1984 4 STW-1 1988 3 1988 3 2010 9 2012 7 03 2017 6 2017 6 20 Gbps 6 2017/3/1310 6 INMARSAT WGS Iridium Globalstar Globalstar a Maritime Satellite aeaee 1979 International Maritime Satellite Organization Inmarsat g GMDSS L ) 34 MHz C 1m 13m 492kbps Ka 50 Mbps A B C M Mini-M M4 F 3 b WGS Wideband Global Satellite, WGS de a d G o aa ee,G WGS DSCS( GBS( ) )
4 WGS 3 WGS 10 WGS 2016 12 WGS-8 WGS X WGS WGS X Ka WGS 26 MHz C MilstarMilstar Milstar C3I 1994 99 02 1994 99 02 2006 SMART-T SCAMP AN/FRC-181 / EHF 44 GHz 20 GHz 2 GHz EHF 44 GHz 20 GHz 2 GHz 60 GHz UHF UHF ( ) 80% 95% 19 IP DVB 3G/4G 20 a b 2017/3/1321
5 Ps min h km 6378km 6378 22 0 0 90 0 90 5000km 2 4 5000km 2 4 5000 20000km 4 12 20000km 12 24 2017/3/1323 1 LEO(low earth orbit) 500~1500km 15~2 500~1500km ~2 10ms 20 2 MEO(medium earth orbit) 8000km~18000km 5-10 8000km 18000km 5-10 50ms 24 3 GEO geostationary earth orbit earth orbit 36000km 24 250ms 64 25 1 1. 2.
6 3 3. 1. 2. 3. 4. 5. 2000 8000km 20008000km 1500 5000 km 13000 20000km 700km 3 700 1500km 5000 13000km 20000 km 1 2 00 700 3 / 274 5 1 22()2()coscos( )eeeeesedRhRRhR d h Re d h Re ())eess 2 A E ()()isetgAarctg A>0 ()sineg coscos()eeseRRh 21[cos cos()]eeseRhEarctg 3. : V cosffV cosfVc 4 5 6 7.
7 10 i10min - - 31 180 0 90 90 0 32 , 6 a, e, i, , 6 , , 1 a e a e 2 i 3 4 33 XY X 0 Y 90 Z X Y X Y X Y Z 34 GHz GHz GHz GHz 18L112 26K18 26 40C395 82 40 ITU ITU 1 2 3 2017/3/1335 3 10 GHz 12 GHz 60 GHz 36 60 GHz
8 1 2 3 4 5 6 SCC TT&C 1 2 3 3 4 FDMA TDMA CDMA 5 5 6 7 8 9 9 2017/3/1340 + TT&C 41 3 5 8000 1500 2017/3/1342 1500 18 2018 ( ) )
9 2017/3/1343 ISL ISL GEO LEO GEO-LEO IOL GEO-GEO LEO-LEO 2017/3/1345 1 / 2 2 3 ( ) ( ) ) ) 2017/3/1347 2017/3/1348 2017/3/1349 Centralserver 2017/3/1350 VSAT VSAT(Very Small Aperture Terminal) ( 3 ) ( 3 )
10 20 80 VSAT VSAT VSAT VSAT 35m 8m Ku 7m 8m Ku 7m 13m C VSAT NCC VSAT VSAT VSAT ODU IDU IDU VSAT VSAT C Ku VSAT C VSAT Ku VSAT Ku C VSAT (TDM) TDM (TDM) TDM VSAT ( 1s) VSAT 1 10-3 VSAT 1 103 TDMA (SOF) ACK ACK 1 5 2018 - 2020 2 9 3 5 1000
