An antenna tracking system tracks a primary antenna to follow a moving signal source, such as a communication satellite. A secondary antenna has a greater beam width than the primary antenna and receives the same tracking signal from the satellite. The primary antenna is tracked according to a predetermined search pattern which causes a variation in the signal amplitude depending upon the relative location of the satellite and the antenna position. The signal strength signals from the two antennas are input to a summation function which takes the difference of the two signals. The noise and signal variation component of the two signals is substantially the same and is therefore eliminated from the resulting difference signal. An antenna control unit utilizes the resulting difference signal
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| - Antenna tracking system (en)
- Poursuite satellite (fr)
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| - An antenna tracking system tracks a primary antenna to follow a moving signal source, such as a communication satellite. A secondary antenna has a greater beam width than the primary antenna and receives the same tracking signal from the satellite. The primary antenna is tracked according to a predetermined search pattern which causes a variation in the signal amplitude depending upon the relative location of the satellite and the antenna position. The signal strength signals from the two antennas are input to a summation function which takes the difference of the two signals. The noise and signal variation component of the two signals is substantially the same and is therefore eliminated from the resulting difference signal. An antenna control unit utilizes the resulting difference signal (en)
- La poursuite satellite (en anglais, Satellite tracking) est une technique modélisant de façon continue les coordonnées spatiales d'un satellite artificiel en orbite terrestre de façon à :
* connaître sa position afin de pouvoir pointer dans sa direction un instrument d'optique ou une antenne radioélectrique.
* connaître sa vitesse afin de déduire la fréquence de ses émissions radios, compte tenu de l'effet Doppler. (fr)
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| - An antenna tracking system tracks a primary antenna to follow a moving signal source, such as a communication satellite. A secondary antenna has a greater beam width than the primary antenna and receives the same tracking signal from the satellite. The primary antenna is tracked according to a predetermined search pattern which causes a variation in the signal amplitude depending upon the relative location of the satellite and the antenna position. The signal strength signals from the two antennas are input to a summation function which takes the difference of the two signals. The noise and signal variation component of the two signals is substantially the same and is therefore eliminated from the resulting difference signal. An antenna control unit utilizes the resulting difference signal to select the optimum signal strength for the particular step of the search pattern. This system is particularly applicable to extremely high frequency communication channels (86 GHz and above) which are subject to and noise. Antenna Tracking Systems can apply to Broadband and Microwave Radio Systems as well for Point-to-Point and Point-to-Multipoint communications. (en)
- La poursuite satellite (en anglais, Satellite tracking) est une technique modélisant de façon continue les coordonnées spatiales d'un satellite artificiel en orbite terrestre de façon à :
* connaître sa position afin de pouvoir pointer dans sa direction un instrument d'optique ou une antenne radioélectrique.
* connaître sa vitesse afin de déduire la fréquence de ses émissions radios, compte tenu de l'effet Doppler. Tous les satellites et véhicules spatiaux sont en contact constant avec plusieurs stations de poursuites, bâtiments munis d'ordinateurs et d'antennes orientables automatiquement, un réseau de stations étant nécessaire car l'orbite des satellites les rend visibles d'un point donné, à chaque rotation seulement. (fr)
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