AOCS IN SATELLITE COMMUNICATION PDF

Apr 14 2019
admin

The attitude and orbit control subsystem (AOCS) provides attitude information communications service equipment, and scientific instruments. Control is. An operating communications satellite system consists of Physical Structure. Attitude and Orbit Control System. (AOCS). Power System. Thermal Control. oriented framework for Attitude and Orbit Control System or AOCS of satellites. Understanding the case study requires some familiarity with the AOCS domain.

Author: Vudot Gardazilkree
Country: Bolivia
Language: English (Spanish)
Genre: Travel
Published (Last): 27 February 2018
Pages: 186
PDF File Size: 10.66 Mb
ePub File Size: 15.20 Mb
ISBN: 461-1-20471-380-1
Downloads: 13613
Price: Free* [*Free Regsitration Required]
Uploader: Kigazuru

Two types of transponder in use: Most satellite antennas are designed to operate in a single frequency swtellite, for example, C band or Ku band. Power systems and rockets are present in this drum. The maximum rotation speed of the reaction wheels is rpm. Then, it will resolve that issue by bringing the satellite into the correct orbit. Attitude and orbit control system AOCS. The AOCS has also been designed to enable the satellite to operate in an autonomous mode for 36 hours, and during eclipses.

This subsystem consists of rocket motors that are used to move the satellite back to the correct orbit when external forces cause it to drift off station and gas jets or inertial devices that control the attitude of the satellite.

The power is used by the communications system, mainly in its transmitters, and also by all other electrical systems on the satellite. The second gas jet will be operated for same period of time, kn the satellite reaches to the desired position. The orientation of a satellite in space is crucial, whether it be for telecommunications or Earth observation craft, or for astronomy missions like XMM-Newton.

Related Files:  POLYCOM SOUNDSTRUCTURE C16 EBOOK

Orbit control subsystem is useful in order to bring the satellite into its correct orbit, whenever the satellite gets deviated from its orbit.

Let X, Y and Z are another set of Cartesian axes. All eventual failures must be detected. This site was designed with the.

Satellite Communication – AOC Subsystem

Altitude and Orbit Control AOC subsystem consists of rocket motors, which are capable of placing the satellite into the right orbit, whenever it is deviated from the respective orbit.

The receiver-transmitter units are known as transponders.

In general, it can be rotated communiction 30 to rpm in order to produce a force, which is of gyroscopic type. This drum is covered with solar cells.

ESA Science & Technology: Engineering

If there is any change in satellite orbit, then it sends a signal regarding the correction to Orbit control subsystem. For redundancy XMM-Newton carries a second star-tracker telescope. The tracking system is located at this earth station and provides information on the range and the elevation and azimuth angles of the satellite. Note that this is not a bright source avoidance cone, but driven by requirements on the spacecraft’s alignment with respect to the Sun to ensure sufficient energy supply and thermal stability.

In this method, the body of the satellite rotates around its spin axis. From then on, the X-ray observatory’s life in space, ij more than ten years, has been beating to the rhythm of its “electronic heart”. The pointing accuracy of the 10 m long XMM-Newton is 0.

Related Files:  SHAKTI CHATTOPADHYAY POEMS PDF DOWNLOAD

Satellite Communication AOC Subsystem

AOC subsystem is helpful in order to make the antennas, which are of narrow beam type points towards earth. In this method, we can stabilize the satellite by using one or more momentum wheels.

Satellites are of this type are called as spinners. The telemetry system sends data derived from many sensors on the satellite, which monitor the satellites health, via telemetry link to the controlling earth station.

Based on telemetry data received from the satellite and orbital data obtained from the tracking system, the control system is used to correct the position and attitude of the satellite. We know that satellite may deviates from its orbit due to the gravitational forces from sun, moon and other planets.

During launching phase, the satellite spins when the small radial gas jets are operated. In this method, each axis contains two gas jets. By continuing to use the site you are agreeing to our use of cookies. Likewise it will never point to within The direction of this motor will be opposite to the rotation of satellite body, so that the antennas point towards earth.