2012年3月14日星期三

what country is playing the role of leading in GPS technology?

Do you know what country is leading in GPS technology?

As we all know, GPS is short for global positioning system which is a highly precise system for determining latitude, longitude and altitude everywhere on the earth. It is also a system of satellites positioned surrounding the earth, each of which contains a precision atomic lock to send out the signals. Therefore, information and signals of necessity for the receivers to work out their own position are transmitted by means of satellites so as to locate the targets or cars with high accuracy. In the field of GPS technology, the United States has the leading position. But do you know how the GPS navigation function? Have you ever pondered about why the United States always plays the leading role in the line of GPS technology? Guess it.

First let’s come to understand the working principle of GPS.

24 satellites are there in orbit running around the Earth. Each of them has got a very accurate orbit, which enables them to know where they really are. Signals of necessity as well as time information can be transmitted by the satellites. In this way, the GPS receiver can synchronize the time by making use of the signal sent by the satellites. What is more, the GPS receiver can work out the distance between where it is and the satellite on the basis of the time stamp of the transmitted signal. This indicates that the position of the GPS receiver is located on a sphere with a radius which is equal to its current distance to the satellite. You will wonder about the position you get, sometimes it is a precise 2-D position, while sometimes it is a 3-D position, won’t you? The reason is simple. When information from 3 satellites is received by the GPS received, then it is able to offer the latitude and longitude, which is called 2-D position. With information from satellites received, 3-D position can be displayed. (latitude, longitude and altitude)

The reason why the US has the leading position

The US has got all he best working knowledge of all the intricacies of the GPS system and operates the GPS system. To be precise, the GPS system is controlled by the United States Department of Defense. Besides, the US operates many differential beacons as part of the differential GPS standard, which can offer information in addition to adjust and correct the signals. In this way, receivers with the incorporation of differential technology can calculate and work out the results more precisely.
You May Also Like

0 评论:

Most popular post last week:

Car GPS Navigation Wholesale