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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.

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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. This site was designed with the. Spinner contains a drum, which is of cylindrical shape. By continuing to use the site you are agreeing to our use of cookies.

It is also used to control the antenna communciation and communication system configuration to suit current traffic requirements and to operate switch on the satellite. The pointing accuracy of oacs 10 m long XMM-Newton is 0.

Missions Show All Missions. This drum is covered with solar cells.

Learn all you sateklite in order to create a. AOC subsystem is helpful in order to make the antennas, which are of narrow beam type points towards earth.

The AOCS has also been designed to enable the satellite to operate in an autonomous mode for 36 hours, and during eclipses. Orbit control subsystem satelkite useful in order to bring the satellite into its correct orbit, whenever the satellite gets deviated from its orbit. If there is a change in altitude of the satellite, then the angles between the respective axes will be changed.

Satellite Communication – AOC Subsystem

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.


It is usually composed of one or more antennas, which receive and transmit over wide bandwidths at microwave frequencies, and a set of receivers and transmitters that amplify and retransmit the incoming signals. If there is any change in satellite orbit, then it sends a signal regarding the correction to Orbit control subsystem. Then, it will resolve that issue by bringing the satellite into the correct orbit.

In this method, the body of the satellite rotates around its spin axis. The communication subsystem is the major part of the satellite. The satellites, which perform this kind of operation are called as de-spin.

ESA uses cookies to track visits to our website only, no personal information is collected. Due to this, the spin axis gets eatellite and the satellite will point in the same direction.

So, the second gas jet will stop the motion of satellite in that axis direction. Before delivery for integration into the spacecraft, the AOCS system underwent several weeks of intensive testing, and subsequent System Validation Tests on the assembled satellite have confirmed its perfect operation.

Altitude control subsystem takes care of the orientation of satellite in its respective orbit. Most satellite antennas are designed to operate in a single frequency band, 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. 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 tracking system is located at this earth station and provides information on the range and the elevation and azimuth angles of the satellite.

Given XMM-Newton’s very specific orbit highly elliptical, irregular eclipse seasons, Sun avoidancethis required very complex hardwired logic within the unit. ESA’s X-ray space observatory targets distant X-ray sources for long periods often exceeding ten hours and one of the key requirements of the satellite is its very high pointing accuracy and stability. These forces change cyclically over a hour period, since the satellite moves around the earth.

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All eventual failures must be detected. Reaction wheel courtesy of MMS. After this, the de-spin system operates in order to make the TTCM subsystem antennas point towards earth station. In this method, each axis contains two gas jets. A satellite which uses multiple frequency bands usually has four or more antennas. 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.

Communication subsystem is placed on top of the drum.

ESA Science & Technology: Engineering

These three axes define the altitude of satellite. This communcation is called as three-axis method. Aoocs are of this communicatiom are called as spinners. In addition, a solar aspect angle within the range must be maintained at all times. The TTCM subsystem present at earth station monitors the position of satellite.

In this method, we can stabilize the satellite by using one or more momentum wheels. Attitude and orbit control system AOCS. A vital requirement of the XMM-Newton mission is that its delicate science detectors must not be damaged by luminous sources in the sky.

In this way, the AOC subsystem takes care of the satellite position in the right orbit and at right altitude during entire life span of the satellite in space.

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