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.
What is Clinometers- what is a Clinometers used for- what are the different type of Clinometers- who invented the Clinometers- how to you make a Clinometers
In this Instruction, we will learn how to use clinometers to measure the height of a tall object. What you will need; Clinometers, Tape, Paper, Pen or pencil, Assistant. Step 1: Pick a Spot Let us pick a spot to measure your object which may be a tree or electric or telephone pole. You should […]
Absolute numbers do not give any indication of the impact of population on the land and its resources. The number of persons living per unit of land areas gives a better picture. This is expressed in the form of density of population per sq.km of land area.It is obtained by dividing the total land area […]
Secondary Activities- what is Factors affecting location of Industries- type of Factors affecting location of Industries- what is Weber’s Theory of Location
Secondary sector transforms the raw materials obtained from the primary sector into consumer goods. So it consists of manufacturing and industrial activities. Since it adds value for the raw materials, it is also called as value addition sector. Industries consume large quantities of energy and require factories and machinery to convert the raw materials into […]