Satellite navigation

GNSSnavigation satelliteglobal navigation satellite systemNavigationsatellite navigation systemsatnavGlobal Navigation Satellite Systemssat navsatellite navigation systemsnavigation satellites
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning.wikipedia
707 Related Articles

Satellite

satellitesartificial satelliteartificial satellites
A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning.
Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, and space telescopes.

GLONASS

Global Navigation Satellite SystemGLONASS GPSGLONASS K
, the United States' Global Positioning System (GPS) and Russia's Global Navigation Satellite System (GLONASS) are fully operational GNSSs, with China's BeiDou Navigation Satellite System (BDS) and the European Union's Galileo scheduled to be fully operational by 2020.
GLONASS (ГЛОНАСС, ; Глобальная навигационная спутниковая система, transliteration: ), or "GLObal NAvigation Satellite System", is a space-based satellite navigation system operating as part of a radionavigation-satellite service.

GNSS augmentation

SBASSatellite Based Augmentation Systemsatellite-based augmentation system
Japan's Quasi-Zenith Satellite System (QZSS) is a GPS satellite-based augmentation system to enhance GPS's accuracy, with satellite navigation independent of GPS scheduled for 2023. GNSS augmentation is a method of improving a navigation system's attributes, such as accuracy, reliability, and availability, through the integration of external information into the calculation process, for example, the Wide Area Augmentation System, the European Geostationary Navigation Overlay Service, the Multi-functional Satellite Augmentation System, Differential GPS, GPS-aided GEO augmented navigation (GAGAN) and inertial navigation systems.
Augmentation of a global navigation satellite system (GNSS) is a method of improving the navigation system's attributes, such as accuracy, reliability, and availability, through the integration of external information into the calculation process.

Real-time kinematic

Real Time KinematicContinuously Operating Reference StationRTK
Real-time kinematic (RTK) positioning is a satellite navigation technique used to enhance the precision of position data derived from satellite-based positioning systems (global navigation satellite systems, GNSS) such as GPS, GLONASS, Galileo, NavIC and BeiDou.

Transit (satellite)

TransitTransit 1BAN/UYK-1
The first satellite navigation system was Transit, a system deployed by the US military in the 1960s.
The Transit system, also known as NAVSAT or NNSS (for Navy Navigation Satellite System), was the first satellite navigation system to be used operationally.

Quasi-Zenith Satellite System

QZSSMichibikiQZS-1
Japan's Quasi-Zenith Satellite System (QZSS) is a GPS satellite-based augmentation system to enhance GPS's accuracy, with satellite navigation independent of GPS scheduled for 2023.
A satellite navigation system independent of GPS is planned for 2023 with 7 satellites.

Time signal

time serviceradio time signaltime
It allows small electronic receivers to determine their location (longitude, latitude, and altitude/elevation) to high precision (within a few centimeters to metres) using time signals transmitted along a line of sight by radio from satellites.
The telegraphic distribution of time signals was made obsolete by the use of AM, FM, shortwave radio, Internet Network Time Protocol servers as well as atomic clocks in satellite navigation systems.

Russia

Russian FederationRUSRussian
, the United States' Global Positioning System (GPS) and Russia's Global Navigation Satellite System (GLONASS) are fully operational GNSSs, with China's BeiDou Navigation Satellite System (BDS) and the European Union's Galileo scheduled to be fully operational by 2020.
Currently Russia has completed the GLONASS satellite navigation system.

Differential GPS

DGPSDifferential Global Positioning Systemposition information
GNSS augmentation is a method of improving a navigation system's attributes, such as accuracy, reliability, and availability, through the integration of external information into the calculation process, for example, the Wide Area Augmentation System, the European Geostationary Navigation Overlay Service, the Multi-functional Satellite Augmentation System, Differential GPS, GPS-aided GEO augmented navigation (GAGAN) and inertial navigation systems.
The advent of a global navigation satellite system (GNSS) could provide greatly improved accuracy and performance at a fraction of the cost.

GNSS positioning calculation

GNSS positioningpositioning method
Several such measurements can be made at the same time to different satellites, allowing a continual fix to be generated in real time using an adapted version of trilateration: see GNSS positioning calculation for details.
The global navigation satellite system (GNSS) positioning for receiver's position is derived through the calculation steps, or algorithm, given below.

Atomic clock

atomic clocksatomiccaesium clock
The satellite uses an atomic clock to maintain synchronization of all the satellites in the constellation.
Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.

Galileo (satellite navigation)

GalileoGalileo positioning systemGalileo project
, the United States' Global Positioning System (GPS) and Russia's Global Navigation Satellite System (GLONASS) are fully operational GNSSs, with China's BeiDou Navigation Satellite System (BDS) and the European Union's Galileo scheduled to be fully operational by 2020.
Galileo is the global navigation satellite system (GNSS) that went live in 2016, created by the European Union (EU) through the European GNSS Agency (GSA), headquartered in Prague in the Czech Republic, with two ground operations centres, Oberpfaffenhofen near Munich in Germany and Fucino in Italy.

China

People's Republic of ChinaChineseCHN
, the United States' Global Positioning System (GPS) and Russia's Global Navigation Satellite System (GLONASS) are fully operational GNSSs, with China's BeiDou Navigation Satellite System (BDS) and the European Union's Galileo scheduled to be fully operational by 2020.
China is developing its own satellite navigation system, dubbed Beidou, which began offering commercial navigation services across Asia in 2012 and it started providing global services by the end of 2018.

Omega (navigation system)

OMEGAOMEGA Navigation SystemChabrier Omega transmitter
The DECCA, LORAN, GEE and Omega systems used terrestrial longwave radio transmitters which broadcast a radio pulse from a known "master" location, followed by a pulse repeated from a number of "slave" stations.
However, the United States Navy had a distinct need for just such a system, as they were in the process of introducing the TRANSIT satellite navigation system.

Radio

radio communicationradio communicationswireless
It allows small electronic receivers to determine their location (longitude, latitude, and altitude/elevation) to high precision (within a few centimeters to metres) using time signals transmitted along a line of sight by radio from satellites.

Radio navigation

radionavigation serviceradio navigation aidradionavigation
Ground based radio navigation has long been practiced.
The latest transponder systems (mode S) can also provide position information, possibly derived from GNSS, allowing for even more precise positioning of targets.

Geostationary orbit

GeostationaryGEOgeostationary satellite
3 of the satellites will be placed in the Geostationary orbit (GEO) and the remaining 4 in the Geosynchronous orbit(GSO) to have a larger signal footprint and lower number of satellites to map the region.
Weather satellites are also placed in this orbit for real time monitoring and data collection, and navigation satellites to provide a known calibration point and enhance GPS accuracy.

BeiDou

BeiDou Navigation Satellite SystemBDSBeidou navigation system
, the United States' Global Positioning System (GPS) and Russia's Global Navigation Satellite System (GLONASS) are fully operational GNSSs, with China's BeiDou Navigation Satellite System (BDS) and the European Union's Galileo scheduled to be fully operational by 2020.
The BeiDou Navigation Satellite System (BDS) is a Chinese satellite navigation system.

Global Positioning System

GPSglobal positioning systemsGlobal Positioning System (GPS)
, the United States' Global Positioning System (GPS) and Russia's Global Navigation Satellite System (GLONASS) are fully operational GNSSs, with China's BeiDou Navigation Satellite System (BDS) and the European Union's Galileo scheduled to be fully operational by 2020.
It is a global navigation satellite system (GNSS) that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.

Indian Regional Navigation Satellite System

NAVICIRNSSIndian Regional Navigational Satellite System
India already has functioning Indian Regional Navigation Satellite System (IRNSS) with an operational name of NAVIC, it is an autonomous regional satellite navigation system that provides accurate real-time positioning and timing services and plans to expand to a global version in long term.
The Indian Regional Navigation Satellite System (IRNSS), with an operational name of NAVIC (acronym for NAVigation with Indian Constellation; also, 'sailor' or 'navigator' in Sanskrit, Hindi, and many other Indian languages), is an autonomous regional satellite navigation system that provides accurate real-time positioning and timing services.

GPS-aided GEO augmented navigation

GAGANGPS-aided geo-augmented navigation (GAGAN)GPS Aided Geo Augmented Navigation
GNSS augmentation is a method of improving a navigation system's attributes, such as accuracy, reliability, and availability, through the integration of external information into the calculation process, for example, the Wide Area Augmentation System, the European Geostationary Navigation Overlay Service, the Multi-functional Satellite Augmentation System, Differential GPS, GPS-aided GEO augmented navigation (GAGAN) and inertial navigation systems.
It is a system to improve the accuracy of a GNSS receiver by providing reference signals.

Indian Space Research Organisation

ISROIndian Space Research OrganizationIndian Space Program
The NAVIC or NAVigation with Indian Constellation is an autonomous regional satellite navigation system developed by Indian Space Research Organisation (ISRO) which would be under the total control of Indian government.

GNSS software-defined receiver

Software GNSS ReceiverGPS software-defined receiver
A software GNSS receiver is a GNSS receiver that has been designed and implemented following the philosophy of software-defined radio.

GNSS reflectometry

GPS reflectometryRemote Sensing
GNSS reflectometry involves making measurements from the reflections from the Earth of navigation signals from Global Navigation Satellite Systems such as GPS.

IRNSS-1E

1EPSLV-C31
All seven satellites, IRNSS-1A, IRNSS-1B, IRNSS-1C, IRNSS-1D, IRNSS-1E, IRNSS-1F, and IRNSS-1G, of the proposed constellation were precisely launched on 1 July 2013, 4 April 2014, 16 October 2014, 28 March 2015, 20 January 2016, 10 March 2016 and 28 April 2016 respectively from Satish Dhawan Space Centre.