![]() Полезное:
Как сделать разговор полезным и приятным
Как сделать объемную звезду своими руками
Как сделать то, что делать не хочется?
Как сделать погремушку
Как сделать так чтобы женщины сами знакомились с вами
Как сделать идею коммерческой
Как сделать хорошую растяжку ног?
Как сделать наш разум здоровым?
Как сделать, чтобы люди обманывали меньше
Вопрос 4. Как сделать так, чтобы вас уважали и ценили?
Как сделать лучше себе и другим людям
Как сделать свидание интересным?
![]() Категории:
АрхитектураАстрономияБиологияГеографияГеологияИнформатикаИскусствоИсторияКулинарияКультураМаркетингМатематикаМедицинаМенеджментОхрана трудаПравоПроизводствоПсихологияРелигияСоциологияСпортТехникаФизикаФилософияХимияЭкологияЭкономикаЭлектроника
![]() |
Read the following list of words related to the topicСтр 1 из 9Следующая ⇒ Unit 1 TECHNOLOGY IN USE Read the following list of words related to the topic.
2. Read and translate the text. What is GPS?
The concept of ranging is best illustrated by example. Consider one satellite that is a distance of 25,000 kilometers from a person holding a GPS receiver. Then the person's position is known to be somewhere on a sphere 25,000 km in radius, centered on the satellite. However, the exact location of the person on that sphere is yet unknown. If, at the same time, the distance from the person to a second satellite can be discovered to be 20,000 km, then a second sphere of radius 20,000 km on which the person is positioned can be determined. Thus the person must be on the circle formed by the intersection of the two spheres of position. A third satellite provides yet a third sphere, which narrows down the location of the person to exactly two points.
The Global Positioning System was designed for precise, real-time military positioning. The military utilizes GPS in land, marine, and airborne navigation. In addition, GPS satellites are equipped with sensors to monitor and detect the detonations of nuclear weapons. However, navigation is the main function of GPS, with uses in all branches of the military. Some examples are photo reconnaissance, low-level navigation, target acquisition, command and control, en route navigation, and missile guidance. Although GPS was designed for military use, civilian use of the navigation technology has dramatically increased with the advent of affordable, portable GPS receivers and the ability to increase the accuracy of civilian GPS readings. A major use of GPS is for surveying and mapping, including land, marine, and airborne surveying, local and global deformation monitoring, and geodetic control. Applications in transportation and communication include automotive navigation aids, with an automated display of the vehicle position on an electronic map. This is particularly useful for emergency vehicles and search and rescue missions. Monitoring the location and movement of vehicles such as taxis, trucks, and boxcars can also be achieved using GPS. Recreational activities have also become a large market for low-cost, portable receivers. Boating, backpacking, biking, and horseback riding are a few of the activities whose participants use fairly inexpensive, relatively low accuracy (good to tens or hundreds of meters) GPS receivers
|