Sistem navigasi satelit: Perbedaan antara revisi
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Pada tahun [[2007]], sistem navigasi satelit yang berfungsi hanyalah NAVSTAR [[Global Positioning System]] (GPS) [[Amerika Serikat]]. [[GLONASS]], sistem navigasi satelit [[Rusia]] sedang berada pada tahap perbaikan, dan diperkirakan akan selesai pada tahun [[2010]]. [[Uni Eropa]] sedang dalam tahap meluncurkan sistem navigasi satelit baru bernama [[Galileo (sistem navigasi satelit)|Galileo]] yang dijadwalkan selesai pada tahun [[2013]]. Sistem navigasi satelit lain yang sedang dikembangkan adalah [[Beidou (sistem navigasi satelit)|Beidou]] milik [[RRC]] dan [[IRNSS]] buatan [[India]].
==Perbandingan beberapa sistem navigasi satelit==
{| class="wikitable"
|-
! System
! [[Beidou Navigation Satellite System|BeiDou]]
! [[Galileo (satellite navigation)|Galileo]]
! [[GLONASS]]
! [[GPS]]
! [[NAVIC]]
! [[QZSS]]
|-
! Owner
| [[China]]
| [[EU]]
| [[Russia]]
| [[United States]]
| [[India]]
| [[Japan]]
|-
! Coverage
| Regional <br/>(Global by 2020)
| Global
| Global
| Global
| Regional
| Regional
|-
! [[Channel access method|Coding]]
| [[CDMA]]
| [[CDMA]]
| [[FDMA]]
| [[CDMA]]
| [[CDMA]]
| [[CDMA]]
|-
! Orbital altitude
| {{convert|21,150|km|abbr=on}}
| {{convert|23,222|km|abbr=on}}
| {{convert|19,130|km|abbr=on}}
| {{convert|20,180|km|abbr=on}}
| {{convert|36,000|km|abbr=on}}
| {{convert|32,000|km|abbr=on}}
|-
! Period
| 12.63 h (12 h 38 min)
| 14.08 h (14 h 5 min)
| 11.26 h (11 h 16 min)
| 11.97 h (11 h 58 min)
| 1436.0m (IRNSS-1A)<br />1436.1m (IRNSS-1B)<br />1436.1m (IRNSS-1C)<br />1436.1m (IRNSS-1D)<br />1436.1m (IRNSS-1E)<br />1436.0m (IRNSS-1F)<br />1436.1m (IRNSS-1G)
|
|-
! Revolutions per [[sidereal day]]
| 17/9
| 17/10
| 17/8
| 2
|
|
|-
! Number of<br />satellites
| 5 geostationary orbit (GEO) satellites,<br />30 medium Earth orbit (MEO) satellites
| 18 satellites in orbit,<br /> 15 fully operation capable,<br /> 11 currently healthy,<br /> 30 operational satellites budgeted
| '''28''' (at least 24 by design) including:<ref>{{cite web|url=http://www.glonass-ianc.rsa.ru/en/GLONASS/|title=GLONASS status|accessdate=2015-07-24}}</ref><br />24 operational<br />2 under check by the satellite prime contractor<br />2 in flight tests phase
| '''31''' (at least 24 by design)<ref>{{cite web|url=http://www.gps.gov/systems/gps/space/#generations|title=GPS Space Segment|accessdate=2015-07-24}}</ref>
| 3 geostationary orbit (GEO) satellites,<br />5 geosynchronous (GSO) medium Earth orbit (MEO) satellites
| In 2011 the Government of Japan has decided to accelerate the QZSS deployment in order to reach a 4-satellite constellation by the late 2010s, while aiming at a final 7-satellite constellation in the future
|-
! Frequency
| 1.561098 GHz (B1)<br />1.589742 GHz (B1-2)<br />1.20714 GHz (B2)<br />1.26852 GHz (B3)
| 1.164–1.215 GHz (E5a and E5b)<br /> 1.260–1.300 GHz (E6)<br />1.559–1.592 GHz (E2-L1-E11)
| Around 1.602 GHz (SP)<br />Around 1.246 GHz (SP)
| 1.57542 GHz (L1 signal)<br />1.2276 GHz (L2 signal)
| 1176.45 MHz(L5 Band)<br />2492.028 MHz (S Band)
|
|-
! Status
| 22 satellites operational,<br />40 additional satellites 2016-2020
| 18 satellites operational<br />12 additional satellites 2017-2020
| Operational
| Operational
| 6 satellites fully operational,<br />IRNSS-1A partially operational
|
|-
! Precision
| 10m (Public)<br />0.1m (Encrypted)
| 1m (Public)<br />0.01m (Encrypted)
| 4.5m – 7.4m
| 15m (Without DGPS or WAAS)
| 10m (Public)<br />0.1m (Encrypted)
| 1m (Public)<br />0.1m (Encrypted)
|-
! System
! [[Beidou Navigation Satellite System|BeiDou]]
! [[Galileo (satellite navigation)|Galileo]]
! [[GLONASS]]
! [[GPS]]
! [[NAVIC]]
! [[QZSS]]
|}
==Referensi==
{{reflist}}
{{teknologi-stub}}
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