Explain global positioning systems, Electrical Engineering

Assignment Help:

Q. Explain Global Positioning Systems?

Modern communication systems abound in practice: cellular phones, computer networks, television satellites, and optical links for telephone service. Communication with instruments has been made possible between our planet, the earth, and Mars.

A global positioning system (GPS) is a modern and sophisticated system in which signals are broadcast from a network of 24 satellites. A receiver, which contains a special-purpose computer to process the received signals and compare their phases, can establish its position quite accurately. Such receivers are used by flyers, boaters, and bikers. Various radio systems that utilize phase relationships among signals received from several radio transmitters have been employed in navigation, surveying, and accurate time determination. An early system of this type, known as LORAN, was developed so that the receivers could determine their latitudes and longitudes.

Figure illustrates in a simple way the working principle of LORAN, which consists of three transmitters (amaster and two slaves) that periodically broadcast 10-cycle pulses of 100-kHz sine waves in a precise phase relationship. The signal received from each transmitter is phase- shifted in proportion to the distance from that transmitter to the receiver. A phase reference is established at the receiver by the signal from the master transmitter; then the receiver determines the differential time delay between the master and each of the two slaves. The difference in time delay between the master and a given slave yields a line of position (LOP), as shown in Figure.

If the time delays of the signals fromthemaster and a given slave are equal (i.e., no differential delay), then the line of position is the perpendicular bisector of the line joining the master and that particular slave. On the other hand, if the time delay from the master is smaller by a certain amount, the line of position happens to be a hyperbola situated toward and near the master, as illustrated by LOP for slave 1 in Figure, and LOP for slave 2, where the time delay from slave 2 is smaller. The intersection of the LOPs for the two slaves determines the location of the receiver.

304_Explain Global Positioning Systems.png

The simple concept of relative phase relationships is exploited by engineers and scientists in several systems that are beneficial to the general public. For example, remote measurements of the height of Greenland's ice cap (by using high-quality GPS receivers) are being made to assess the possible effects of global warming.

Related Discussions:- Explain global positioning systems

Aggregate technical and commercial loss, Aggregate Technical and Commercial...

Aggregate Technical and Commercial Loss It is unfortunate in that addition to T&D losses, there is also a loss in revenue because of non-realisation of billed demand which lea

..analong course design, Askhigh precision linear amplifier question #Mini...

Askhigh precision linear amplifier question #Minimum 100 words accepted#

#title., what is plane transmission grating/?

what is plane transmission grating/?

What are plastics, What are plastics? Plastics are materials (containi...

What are plastics? Plastics are materials (containing carbon as common element) that have organic substances of high molecular weight and are able of being formed in required

Explain the construction of jfet, Q. Explain the construction of JFET? ...

Q. Explain the construction of JFET? The basic construction of the p-channel JFET is shown in figure. The major part of the structure is the p-type material that forms the chan

The fundamental frequency , The frequency domain representation of a signal...

The frequency domain representation of a signal is shown  below: i. What are the fundamental frequency and the corresponding period of this signal (shown in Figure )? ii.  Pl

Electrocardiogram, i av designed my circuit in proteus and written the java...

i av designed my circuit in proteus and written the java graphical code for analysis of the results....i need help on how i can run this circuit in proteus and get the results in t

Encoder - introduction to microprocessors , Encoder The encoder is a...

Encoder The encoder is a logic  circuit  which  provides  the binary code is  output  for each input each input signal. In  other words  we can  say that it performs  just  op

Define intermodal dispersion, Define intermodal dispersion? Dispersion...

Define intermodal dispersion? Dispersion of the transmitted optical signal causes distortion for both digital and analog transmitted signal. The dispersion causes broadening o

Applications of operational amplifiers, Q. Applications of operational ampl...

Q. Applications of operational amplifiers? An op amp along with a few external components (resistors and capacitors) is capable of performing many different operations-hence th

Write Your Message!

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd