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رمضان كريم

رمضان كريم

 

 

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قديم 04-03-2020, 01:21 PM   رقم المشاركة : 1
ملك الفضائيات
مشرف منتديات فنان سات
 
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ملك الفضائيات متواجد حالياً

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1990 11170786129GPS and recognize what is done
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GPS and recognize what is done



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Hardware located in the sky that makes us use GPS "Global Positioning System" system most people do not know anything about him.

GPS has become very important in the lives of most individuals, it serves as a partner who teach you where you are present, and GPS system may become available in most mobile devices are now.

What is GPS? GPS "Global Positioning System" is used to measure latitude lines for height person with great precision and, and has been developed originally by the US Department of Defense in 1973 so that it can identify the locations of soldiers and military vehicles accurately, and today, is the use of GPS system in the scientific and commercial uses as well.

GPS system based on a network of 24 satellite Adoroa around the earth twice every 24 hours, this network of satellites known as Navstar, satellite flour and used high-precision frequencies enable satellites to locate people very accurately, each satellite rotation is sending his place in a very precise with a time limit, time is supplied through the atomic clocks in the US Naval Observatory "Observatory Marine American" -balnsph States Delivery, each satellite GPS industry has several atomic clocks on his portrait, then the operation of the satellites at the same time, then the information is sent accurately with some, these signals are transferred the speed of light, and these signals up to the future at different times, and that, because it depends on the distance between the future and between each satellite, and as the distance varies from satellite to another, it does not reach all the signals at once.


The launch of the first satellite, the first of 24 satellites is their release in 1989, and has successfully completed the first set of satellites consists of 24 satellite launch in 1994.

The GPS network consists of three major canons as follows:


1. Space slice

There are 24 satellite is about twice the floor time per day at speeds of up to higher than 11 kilometers per hour, and these satellites work through the light of the sun, but it also comes a battery to work in the absence of the sun, and has been their position all of us to be what at least 4 satellites phenomenon from any point on the Earth's surface.


2. Control slice

And is a major control station makes sure the satellite work without any problems, and that the signals that are sent to earth minute signals.


3. user slice

This is the users' slide, and are devices that have been manufactured to receive signals from the satellite, and these devices include phones, laptop computers, some cars, and machinery and many other tools.


GPS system is available in several formats, whether as a navigation for cars, boats, or pilots, can be used GPS devices also in recreational activities such as walking long distances and ride a bike on the mountains, but that now, GPS systems became available in most smart phones and handheld devices Other , as it is the use of GPS systems in many areas of science, for example, the use of these systems in meteorology to predict the atmosphere, and it is very useful for geology, and that is in some branches the use of high-precision surveying methods, beside this, GPS devices are also used in the measurement of tectonic movements before and after the occurrence of earthquakes.


The basic principle of the place of GPS very self-evident, if we know the exact location of the satellite, S1, for example, and we know that the signal transmission time was T1, this we are located in a specific point of the field of satellite.

If we now add another satellite location S2, T1 and takes about time for the delivery of signals to us, we will find that when we use the data that we took from the two satellites will be able to determine our place on one of the following points: L1 or L2.


And now it clearly has become more, if added satellite third, we will find that we are on one point, and in Example No. 3, we will find that we are on the L2 point, and if we add a satellite fourth we be able to calculate the height, the height is the distance above sea level ( MSL), and this is a different length, Vataiwl is used in GPS systems to measure the distance between the person and the Earth.

How accurate is the GPS? GPS will only work at full capacity when it is used in the open, the use of GPS devices in buildings and enclosed areas might not be successful, in fact, no obstacle exists between the satellite and the future, such as tall buildings or mountains, it is possible to produce many of errors.

And there are many factors that play a role in the accuracy of the GPS, and including: - the signals that are sent from the satellite is going through the atmosphere, and these delays commonly known as the ionosphere and the troposphere, and is partially corrected through the GPS systems.


- At times, it can occur a reflection of the signal because of the high buildings or mountains or hills and so on, and this results in a delay in the arrival signals to the future.

- Built-in clocks with reception differ from the satellite atomic clocks, and this results in errors in the planned arrival of references to the future.

- Tropical errors, also known as ephemeris errors, it is possible that occur because of inaccuracies in the statement places satellite.

- The best way is where readings up to a maximum accuracy is when satellites are placed at distances spaced wide, if satellites were placed near each other, many problems can occur.

Assisted GPS "GPS Assistant"

Assisted GPS (also known as AGPS or A-GPS) is often found in portable devices smart such as telephones, and the GPS Assistant improving the accuracy and Availability information in two ways, the first way, the is using the mobile network for information satellites places industrial, this Can a GPS future to achieve (TTFF) faster, this means that the information should not be downloaded from the satellite to the future, and this, the user can get his place data more quickly, secondly, if the signals of GPS is weak or unavailable, AGPS will use plants mobile to find out where the person

الموضوع الأصلي: GPS and recognize what is done || الكاتب: ملك الفضائيات || المصدر: منتديات فنان سات

البحث

فنان سات , جامعة الفضائيات العربية , اكبر منتدى فضائي , اقوى سيرفر شيرنج ,كروت ستالايت , خدمات مجانية , قنوات فضائية , ترددات حديثة ,سيرفرات مجانيه.





GPS and recognize what is done







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