GNSS refers to the collection of the world’s global satellite based positioning systems. It includes GPS (United States) GLONASS (Russia) GALILEO (European Union) BEODOU (China) IRNSS (India) QZSS (Japan). GNSS can provide centimetre level accuracy with a low-cost receiver, if an error correction technique is used. GNSS are recognized to be the systems of choice in outdoor environments and, to a great extent, one of the most accurate source of position (and precise timing) information when it is available. T he first satellite navigation system was Transit, a system deployed by the US military in 1960’s. Transit’s operations were based on the Doppler Effect: the satellites travelled on well-known paths and broadcast their signals on well-known radio frequency. The received frequency will differ slightly from the broadcast frequency because of the movement of the satellite with respect to the receiver. The satellite broad cast signals that contains orbital data (from which the position of the satellite can be calculated) and the precise time, the signals is transmitted. There are multiple constellations of GNSS satellites orbiting the earth. GNSS satellites’ orbit situated about 20,000 km above the earth’s surface. They are moving very fast, several kilometres per second. The latest generation of GNSS satellites (Block IIF) weight over 1,400 kg.
Political Geography – Concept of Nation and State- what is nation and state- what is nation- what is nation example- what is same meaning nation- is a country a nation- what to they mean state- is a state a country
Nation A nation is a group of people who see themselves as a cohesive and coherent unit based on shared cultural or historical criteria. Nations are socially constructed units, not given by nature. Their existence, definition, and members can change dramatically based on circumstances. Nations in some ways can be thought of as “imagined communities” […]
What is mean by Prismatic- what is Prismatic body – is Prismatic color – Use of Prismatic Compass – what is the Use of Prismatic Compass- what is advantage of compass
Compass Prismatic compass is a simple instrument comprising an aluminum ring graduated to 30 minutes held at the top of a broad magnetic needle set in balance on a hard steel pivot. This compass is fitted in a circular metal box with a transparent glass cover. The glass – top is further covered with a […]
What is Ethnicity -what is Religion – what is Tribal Religions- what is Pigmies – what is Eskimos – what is Masai -what is Pigmies
Ethnicity is a concept referring to a shared culture and a way of life. Th is can be refl ected in language, religion, material culture such as clothing and cuisine, and cultural products such as music and art. Ethnicity is oft en a major source of social cohesion and social confl ict. Th e world […]