Big or small, future satellites must be able to communicate efficiently with Earth-based stations. Historically, NASA has relied on radio frequency (RF) communication, but RF is reaching its limit as demand for more capacity increases. To overcome this obstacle, NASA scientists have been developing...
which enable researchers to identify specific whales and track the sightings to get an idea of where and when the whale is traveling. Researchers also usesatellite tags, cigar-sized radio transmitters that communicate withsatellitesto track a whale's location. Researchers...
A high-Earth orbit like this is called geosynchronous (because it's synchronized with Earth's rotation) or geostationary (if the satellite stays over the same point on Earth all the time). Communications satellites—our "space mirrors"—are usually parked in geostationary orbits so their signals...
The communication between satellites and Earth-based stations relies on two key components:uplinkanddownlink. The uplink refers to the signal sent from an Earth station to the satellite. This signal typically carries user data, such as internet requests, from your device to the internet. Conversel...
Some technology uses satellites (卫星) to communicate. Satellites are also used to examine the changes in the Earth’s climate (气候) and seas, for weather report and for military (军事). We also use satellites in food production. Because of the use of space technology in crops, fewer and...
In reality, the satellite is circling the Earth at the same pace as the Earth’s rotation. This results in the satellite completing one orbit around the Earth in precisely 24 hours, or one day. Geostationary satellites are exclusively positioned at an altitude of 22,300 miles directly above ...
But instead of using towers on the ground, it communicates with satellites that orbit the Earth. There are currently 27 GPS satellites in orbit -- 24 are in active use and 3 act as a backup in case another satellite fails. In order to determine your location, a GPS receiver has to ...
NASA uses radar to map the Earth and other planets, tracksatellitesand space debris and help with things like docking and maneuvering. The military uses radio detection and ranging to detect enemy aircraft with pulses of short radio waves. ...
As the name implies,satellite internetuses satellites orbiting the Earth to provide internet access, particularly in remote or rural areas where traditional wired connections are unavailable. The process begins with an ISP sending data to a satellite in geostationary orbit. The satellite then relays th...
Modern technology like the satellites(人造卫星)makes information travel fast. How has this speed of communication changed the world? To many people, the world has become smaller. Of course this does not mean that the world is really becoming smaller. It means that the world seem...