Tripp Corbin, CFM, GISP CEO eGIS Associates, Inc. Relationships Matter.
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Transcript of Tripp Corbin, CFM, GISP CEO eGIS Associates, Inc. Relationships Matter.
![Page 1: Tripp Corbin, CFM, GISP CEO eGIS Associates, Inc. Relationships Matter.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e985503460f94b9b73e/html5/thumbnails/1.jpg)
Tripp Corbin, CFM, GISPCEO
eGIS Associates, Inc.
Relationships Matter
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What is GNSS?Global Navigation
Satellite SystemsAny collection of
Satellites which can be used to determine location on Earth
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Current Active GNSSGPS – USGLONASS – RussianGalileo – European UnionCompass - China
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GNSS BasicsLocation Determined
based on Distance – Trilateration
Distance based on timeTypically need at least 4
Satellites for a positionErrors Caused by
Clock differencesAtmosphereMultipathSatellite Geometry
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Global Positioning System - USGlobal Positioning System - USNavstar - Full operational
constellation in 1994WGS 84 Datum31 Active Satellites3-4 Decommissioned Satellites6 Orbit altitude of 12,000 miles2 Frequencies at about 50
wattsL1 C/A & P – 1575.42 MHzL2 P(Y) - 1227.60 MHz
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GLONASS - RussianGlobal Navigation Satellite SystemOperational with 24 satellites in 1995System declined from 1996 to early 2000sRebirth 2000s to present (2011 at 24 again)19,000KM orbit 24 active satellites, 3 on-orbit spares, 1 in
maintenance, 1 in flight test phase3 launched in July 2013 destroyed in launch
crashFuture funding in question
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GLONASS – Frequency & moreEach Satellite has its ownTwo Bands
L1 – 1602.56 MHz to 1615.5 MHzL2 – 1240 MHz to 1260 MHz
Frequency Division Multiple AccessCDMA with L3 in 2011 (1202.25 MHz)Signal Strength equal to GPSPZ-1990 Datum – Earth Centered (16in ± from
WGS 84)
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Galileo – European Union4 Active Satellites
2 satellites launched Oct 21, 20112 launched on Oct 12, 2012
Full 30 Satellite Constellation by 2019Galileo Firsts
Galileo only post processed position – Jan 6, 2013
Galileo only real time position – March 12, 201324 Operational Satellites by 2016
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Galileo – Frequency & More4 Bands
E1 – 1575.42 MHz (Same as GPS L1)E5a – 1176.45 MHz (Same as GPS L5)E5b – 1207.14 MHzE6 – 1278.75 MHz
Full 30 Satellite Constellation by 2019Galileo Firsts
Galileo only post processed position – Jan 6, 2013Galileo only real time position – March 12, 2013
24 Operational Satellites by 2016
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Compass (aka Beidou-2) - ChinaChina-sponsored military and civilian system14 Satellites in operationCoverage area limited35 Satellites when completeSame Freqs as GalileoPatent issues with Galileo
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2007
2012
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Regional GNSSIndian Regional Navigational Satellite
System (IRNSS) - IndiaQuasi-Zenith Satellite System (QZSS) – Japan
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Indian Regional Navigation Satellite System (IRNSS) - IndiaFirst satellite launched in 2013Will consist of 7 Satellites by 2015
4 in Geosynchronous3 in Geostationary
Limited coverageFrequencies
L5 – 1176.45 MHzS – 2492.08 MHz
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Quasi-Zenith Satellite System (QZSS) - JapanAuthorized in 20024 Satellites by 20187 Satellites totalFirst launched in
Sept 2010Augment other
systems
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Future of GPSNew SatellitesMore Frequencies
Civilian useMore signals & codes
CivilianMilitary
Indoor GPS
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New Civilian FrequenciesAllow improved atmospheric correctionFaster signal and position acquisitionIncreased signal strength L2C
Introduced in 2005 on Block IIR-M Satellites Same Frequency as L2 P(Y) Not encrypted
L5 – aka Safety of Life Introduced in 2010 on Block IIF Satellites In future can carry more data than others Higher power transmission than L2C Not encrypted
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New Civilian FrequenciesL1C
Increases GPS compatibility with other GNSSHigher power than L1 C/AStill compatible with older GPS receiversDeployed on Block III satellites (2014)
Full support of new Frequencies (24 Satellites)L2C – 2016 (about 10 right now)L5 – 2019 (about 4 right now)L1C – 2020 (none right now)
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New Block III GPS SatellitesLockheed MartinUp to 32 will be purchasedFirst launch in 2014Frequency Capability
L1 C/A & L1CL2 P(Y) & L2CL5
New M code with Directional Antenna
Harder to Jam17
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New CNAV MessagesTransmitted on L2C & L5First test June 15-29, 201315 Message types such as:
10 & 11 – Ephemeris12 – Reduce Almanac (7 Satellites at a time)13 – Clock differential correction14 – Ephemeris Correction30 – Clock & Ionosphere correction
Means improved performance, redundancy, and improved interference mitigation
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