- Diagram of satellite communication system.jpg (170.64 KiB) Viewed 232 times
Satellite communication Subsystem
Below are details of each part of satellite communication system.
Communication satellite
It consists of one or more communication satellites, which relay signals in the air;
Telemetry tracking and command subsystem
Its function is to track and measure the satellite, control the satellite to enter the designated position on the geostationary orbit accurately, and monitor and correct the orbit, position and attitude of the satellite;
It is composed of command and control center, data exchange center, and monitoring stations in various places. It is an important part to ensure the normal operation of satellite communication system. It is designed to keep communication satellites in the correct orbit at all times. The telemetry and tracking subsystem should track and measure the position of the communication satellite in real time, and adjust the position of the communication satellite through the monitoring and management system, so that the communication satellite is always in the correct orbit and prevent it from deviating from the orbit, so that the signal can be received normally.
We have 6.2m S/X band antenna which is used for telemetry tracking and command.
Monitoring and management subsystem
Its function is to monitor the communication performance and parameters of satellites in orbit before service opening and routine monitoring and control after service opening, including transponder power, antenna gain, earth station transmit power , frequency and bandwidth, etc., to ensure the normal operation of communication satellites; C&Ku band antenna is widely used for this application.
Earth station subsystem
Including the earth station and the communication service control center of the earth station, each earth station includes antennas, feeds, tracking and servo systems, transmitters, receivers, baseband equipment, terminal equipment, etc.
Generally large satellite dish like 6.2m antenna or 7.3m antenna can meet such requirement.
Process of satellite communication
Subsystem composition of satellite communication system
2.1 Composition of earth station system
As can be seen from above Fig.3, the earth station is composed of six subsystems: antenna subsystem, transmitter subsystem, receiver subsystem, communication control subsystem, channel terminal equipment subsystem and power supply subsystem. Antenna system of earth station The reflector antennas are used by earth station antennas, such as parabolic antennas, Cassegrain antennas, improved or modified parabolic antennas and ring focus antenna systems, which main technical requirements are as follows.
High gain
Low noise temperature
Broad band characteristics
Good rotation
High mechanical precision
A.antenna subsystem
The antenna system consists of three parts: the main antenna device, the feed device and the tracking device. The feed device is connected between the main antenna device, the transmitter and the receiver, and its function is to feed the RF signal output by the transmitter to the antenna At the same time, the electromagnetic wave received by the antenna is fed to the receiver, that is, it plays the role of transmitting energy and separating the sending and receiving waves. The typical feeding equipment consists of a feed horn, a wave guide element (directional coupler, polarization conversion and duplexer), That is to say the loss of the feeding equipment must be small enough.
Antesky Science Technology Inc. was built in 1985, we’re mainly engaged in the design and manufacture of satellite communication large satellite dish,VSAT antenna,TVRO antenna, Portable flyaway antenna and relevant control and tracking system. We have a selected range of antenna in the frequency band, such as C-band, Ku-band, X-band, L-band, S-band, Ka-band, DBS-band. Antesky is insisting in producing high quality antenna with good price.
- Diagram of satellite communication system.jpg (170.64 KiB) Viewed 232 times