Definition- The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.
How it works
GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.
20081128
What is Glonass? (A refresher)
Definition - GLONASS (for Globalnaya Navigatsionnay Sputnikovaya Sistema), the Russian Federation's Global Navigation Satellite System (GNSS), is the Russian version of a global positioning system. Similar to the United States' Global Positioning System (GPS), GLONASS is owned and operated by the military. GLONASS provides two separate levels of precision: deliberately degraded (for security purposes) signals for civilian users offer accuracy to within 100 meters, while its signals for military users offer accuracy of 10-20 meters.
GLONASS was designed to operate a system of 24 satellites (21 operational, and three spares for failover redundancy) orbiting at a height of 19,140 kilometers in three circular planes, at an inclination of 64.8 degrees relevant to the equatorial plane.
GLONASS was designed to operate a system of 24 satellites (21 operational, and three spares for failover redundancy) orbiting at a height of 19,140 kilometers in three circular planes, at an inclination of 64.8 degrees relevant to the equatorial plane.
20081127
Glonass News
The latest trio of modernized GLONASS satellites (GLONASS-M) have begun transmitting healthy navigation messages, bringing the total of operational satellites to 17 — a milestone for the Russian GNSS constellation.
The third GLONASS-M space vehicle (SV) — SVN 726 launched September 25 began transmitting a healthy navigation message on November 13, giving the rebuilt GLONASS constellation the highest number in more than a decade. GLONASS SVN 110 (724) began transmitting on October 26, and SVN 111 (725), on November 5, according to the Russian Space Agency (Roscosmos) GLONASS Information-Analytical Center.
Although GLONASS had a full constellation of 21 operational satellites in 1996, by the beginning of 1998 only 16 SVs were still transmitting as the system went without launches for three years after December 1995. The short lifespan of the first-generation satellites coupled with the economic decline that followed the collapse of the Soviet Union made the long-term prospects of the world’s second GNSS appear very doubtful.
Triple-SV launches in 1998 and 2000 could not stem the dwindling constellation and by the end of 2001 only seven spacecraft operating on orbit. A decision earlier that year by then-President Vladimir Putin began a program to rebuild and modernize GLONASS.
Another triple GLONASS launch is scheduled for December 25 this year.
From December 18, GLONASS will help pilots to land aircraft at Koltsovo airport, Ekaterinburg. According to an ITAR-TASS news agency report on the Roscosmos website, the airport will initiate a new procedure for landing aircraft equipped with GLONASS/GPS receivers — the third airport in Russia (after Domodedovo and Kurumoch) ordered by the Russian Civil Aviation Agency to fulfil this requirement
The third GLONASS-M space vehicle (SV) — SVN 726 launched September 25 began transmitting a healthy navigation message on November 13, giving the rebuilt GLONASS constellation the highest number in more than a decade. GLONASS SVN 110 (724) began transmitting on October 26, and SVN 111 (725), on November 5, according to the Russian Space Agency (Roscosmos) GLONASS Information-Analytical Center.
Although GLONASS had a full constellation of 21 operational satellites in 1996, by the beginning of 1998 only 16 SVs were still transmitting as the system went without launches for three years after December 1995. The short lifespan of the first-generation satellites coupled with the economic decline that followed the collapse of the Soviet Union made the long-term prospects of the world’s second GNSS appear very doubtful.
Triple-SV launches in 1998 and 2000 could not stem the dwindling constellation and by the end of 2001 only seven spacecraft operating on orbit. A decision earlier that year by then-President Vladimir Putin began a program to rebuild and modernize GLONASS.
Another triple GLONASS launch is scheduled for December 25 this year.
From December 18, GLONASS will help pilots to land aircraft at Koltsovo airport, Ekaterinburg. According to an ITAR-TASS news agency report on the Roscosmos website, the airport will initiate a new procedure for landing aircraft equipped with GLONASS/GPS receivers — the third airport in Russia (after Domodedovo and Kurumoch) ordered by the Russian Civil Aviation Agency to fulfil this requirement
20081116
November 14, 2008
GLONASS Constellation Grows to 17 as Latest Satellites Come On-line
The latest trio of modernized GLONASS satellites (GLONASS-M) have begun transmitting healthy navigation messages, bringing the total of operational satellites to 17 — a milestone for the Russian GNSS constellation.
The third GLONASS-M space vehicle (SV) — SVN 726 launched September 25 began transmitting a healthy navigation message on November 13, giving the rebuilt GLONASS constellation the highest number in more than a decade. GLONASS SVN 110 (724) began transmitting on October 26, and SVN 111 (725), on November 5, according to the Russian Space Agency (Roscosmos) GLONASS Information-Analytical Center.
Dual GPS GLONASS Modules released by www.glonasscentral.com last month support the growth of the industry as a whole, with some of the lowest cost dual glonass receivers on the market.
Двойные модули GPS GLONASS выпустили поддержкой месяца www.glonasscentral.com последней рост индустрии в целом, с некоторыми из самых недорогих двойных приемников glonass на рынке.
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