Earth-Track Integral System for Communication Satellites?
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Answer:
Answer:Earth-Track Integral System for Communication Satellites:
If several satellites are spaced around the same orbit in space, the tracks of the satellites will be different due to Earth’s rotation about its own axis.
If four satellites are placed into different orbits with their ascending modes displaced successively by 30°intervals to the east direction, the difference, in effects of Earth’s rotation, can be counteracted and the paths of all the satellites relative to the Earth will be the same.
Such Earth-Track integral systems can be arranged to have the satellite period an integral factor of the sidereal day in order to have the same track repeated day after day.
Answer:
Remote Sensing Satellites:
‘Remote Sensing’ is obtaining information about an object by observing it from a distance and without coming into actual contact with it.
The orbit of a remote sensing satellite is such that the satellite passes over a particular latitude at approximately the same local time. i.e. the position of the Sun with respect to a point on the Earth remains approximately the same as the satellite passes over it. Such orbits are called Sun-synchronous orbits.
A remote sensing satellite takes photographs of a particular region with nearly the same illumination every time it passes through that region.