By definition, a given sunsynchronous orbit is a finite resource similar to a. A 600kg spacecraft is considered in an orbit that is 571 km in altitude and at an inclination of 42. The distance between successive strips is the tracking interval. A non sunsynchronous near polar orbit would result in some days when the satellite is orbiting in a plane at 90 degrees to the direction of the sun, which would make it. Definitions of sunsynchronous orbit, synonyms, antonyms, derivatives of sunsynchronous orbit, analogical dictionary of sunsynchronous orbit english. For the love of physics walter lewin may 16, 2011 duration. The space grid sunsynchronous orbiting sbsp satellites with.
Sunsynchronous orbits typically have nearzero eccentricity to satisfy the mission requirements of earth observation satellites. This is the total number of orbital revolutions that the satellite has to take to reach the same point with the same direction of movement. A study was conducted to demonstrate the development of an extension of the sunsynchronous orbit, which as per definition is a finite resource similar to a geostationary orbit, the extension to the sunsynchronous orbit was considered using an undefined, nonorientationconstrained, and lowthrust propulsion system. Sun synchronous orbits for the earth solar power satellite. A sun synchronous orbit is designed to drift slowly so as to keep in sync with the earths orbit around the sun. Sunsynchronous satelite is that one which faces the sun every time. In one orbit across the planet, the satellite covers a thin strip of the planet. For this reason, sunsynchronous orbits are extensively used by earth observation eo platforms, including currently the environmental satellite envisat, the second european. Merger of ocean color information from multiple satellite. All this starts to get complicated when you want to plot an actual orbit.
These orbits are used for satellites that need a constant amount of sunlight. A sunsynchronous orbit is one that lies in a plane that maintains a fixed angle with respect to the earth sun direction. Satellites that take pictures of the earth would work best with bright sunlight. These concepts will be discussed briefly and then merged into a new concept call. A sunsynchronous orbit can place a satellite in constant sunlight, which allows the solar panels to work continuously.
When the satellite reaches the first strip, it counts as one orbital cycle. Sun synchronous orbits these orbits allows a satellite to pass over a section of the earth at the same time of day. So a circle is the special case in which the two foci merge to. The modis swath is 2330 km cross track and seawifs gac coverage is 1502 km cross track. Gaps between the orbits are filled on the next day. Pdf the solar tides and the sunsynchronism of satellite. A satellite in a sunsynchronous orbit still orbits the earth, but does so in such a way that over the course of the day, its distance to the sun will change in a consistent pattern no matter the. In other words, it combines altitude and inclination in such a way that an object on that orbit ascends or descends over any given point of the earths surface at the same local mean solar time. If a satellite in a sunsynchronous circular orbit was deployed at an altitude above. This orbit is also useful for imaging, spy, and weather satellites, because every time that the satellite is overhead, the surface illumination angle on the planet underneath it will be nearly the same.
Due to precession, it covers another thin strip westwards, and this gradual shift continues. Pdf multisunsynchronous mss orbits for earth observation. They are both in descending sun synchronous, nearpolar, circular orbits with a 10. Sunsynchronous orbiting sbsp satellite with equatorial orbiting reflector. Extension of the sunsynchronous orbit university of strathclyde.
Sun synchronous orbits with ground tracks which reach from 50 to 80 north and south inclinations between 100 and will have altitudes lying in the range between km and 4500 km. Extension of the sunsynchronous orbit researchgate. Finally, by merging the ideas of the multi sunsynchronous orbits and. Hence the sso condition is primarily a relationship between the satellite s inclination and mean orbital altitude ha. On sunsynchronous orbits and associated constellations. Slot architecture for separating satellites in sun.
Geostationary orbit, geosynchronous orbits and sun synchronous orbit duration. These satellites orbit at an altitude between 700 to 800 km. A study was conducted to demonstrate the development of an extension of the sunsynchronous orbit, which as per definition is a finite resource similar to a geostationary orbit, the extension to. Pdf on sunsynchronous orbits and associated constellations. A sunsynchronous orbit is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planets surface at the same local mean. A semianalytical method for calculating revisit time for satellite. Molniya orbits and sunsynchronous orbit types of orbits.
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