Alternative agronomic crops by Patricia A Sauer; Appropriate Technology Transfer for Rural

By Patricia A Sauer; Appropriate Technology Transfer for Rural Areas (Organization)

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Due to the relatively large movement of a satellite in HEO with respect to an observer on the earth, satellite systems using this type of orbit need to be able to cope with Doppler shifts. An example of an HEO system is the Russian Molnya system; it employs three satellites in three 12-hr orbits separated by 120° around the earth, with apogee distance at 39,354 km, and perigee at 1,000 km [GEO200101]. 8 provides a basic satellite glossary for the concepts covered in this chapter from a variety of industry sources (including [SAT200501], [ANS20001], [EUT200701], and [GEO200101] among others).

A geostationary satellite completes one orbit revolution around the earth every 24 hr; hence, given that the satellite spacecraft is rotating at the same angular velocity as the earth, it overflies the same point on the globe on a permanent basis (unless the satellite is repositioned by the operator). In a geostationary orbit, the satellite appears stationary, that is, in a fixed position, to an observer on the earth. , North America, or even continental United States). Non-GEO orbits are discussed next.

Signal management on the ground is better handled at lower frequencies, and hence, the purpose/need for frequency conversion (to a higher frequency level for transmission and down to a lower frequency level at reception). The transponder is a repeater that takes in the signal from the uplink at a frequency f 1, amplifies it, and sends it back on a second frequency f 2. An uplink system consists of the following subsystems (often in redundant mode): 77 Network interface devices such as routers, encryptors, conditional access systems, and encapsulators.

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