We know that the geostationary satellites are all above the earth's equator (latitude is O), about 360,000 kilometers away from the earth's equator, and are stationary relative to a certain point on the earth (in fact, its speed is equal to that of the earth, and the linear speed is at the first cosmic speed of 7.9 -11.2 km/s is revolving around the earth), so it is also called a geosynchronous satellite. The satellite longitude refers to the degree of the earth's longitude that the satellite is projected on the earth, that is, the satellite is about 36,000 kilometers above the intersection of the earth's equator and the satellite's longitude.
China's border is located in the northern part of the earth's equator, that is, the northern hemisphere, so the geostationary satellite is always in the south of China, that is to say, the direction of the ground satellite antenna should face the south.
Generally, when installing a satellite antenna designed by VSAT satellite internet providers, you should first correctly judge the correct location of the due south position. The easiest way is to use a thin bamboo pole perpendicular to the ground at 12:00 noon. The projection is due south. When the sun is in the sky and the time is reported at 12:00 noon, just use the bamboo pole used for projection as a straightedge, and use a marker to draw a straight line for the projection on the ground, then this straight line points to the south direction of the locally installed antenna.
Of course, since the longitude and latitude of the time zone of the earth are divided into 360°24 equal divisions, the longitude of each time zone should be 15°, that is to say, every 4 minutes, there is a difference of 1 longitude.
The earth is divided into 360 parts on average along the longitude and latitude, and each part is 1°. The 0° longitude and the 180° longitude just divide the earth into two hemispheres, the east and the west. °, the farther to the east, the greater the longitude, and the farther to the west, the smaller the longitude.
Before implementing the installation of satellite antenna, we first need to know the longitude where we want to receive the satellite, and secondly, we need to know the geographic longitude of our location. If the longitude of the satellite is equal to the longitude of the location, then the satellite receiving antenna should be facing south. If the longitude of the satellite is greater than the longitude of the location, the receiving antenna of the satellite should be facing south by east. If the longitude of the satellite is less than the longitude of the location, the satellite receiving antenna should face westward. You may be interested in VSAT antenna manufacturers.
After a preliminary understanding of the longitude of a satellite to be received and the local longitude, it is easier and more convenient to further estimate the elevation angle of the antenna. If the longitude of the satellite to be received is equal to the longitude of the receiving location, then the elevation angle of the satellite antenna should be the maximum value at this time.
Conversely, if the difference index between the longitude of the satellite and the longitude of the location is larger, the elevation angle of the satellite antenna should be smaller, so that the elevation angle position of the satellite receiving antenna can be roughly determined.
