ND SatCom SKYWAN IDU 1070, Manual

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2010-10-26 Network Design and Engineering Guide 73
Outdoor Unit and Satellite Link Design
Introduction
3 OUTDOOR UNIT AND SATELLITE LINK
DESIGN
In the previous chapter ’General Carrier Design’ we discussed how to derive optimized Sky-
WAN
®
TDMA carriers from user traffic requirements. In this chapter we discuss how to perform
link budget calculation for Sky WAN
®
networks using the ND Satcom Link Budget tool and how
to optimize links and the outdoor equipment of earth stations.
The next steps in the engineering process are
-
the choice of a suitable satellite rsp. satellite transponder(s) and
- an optimized outdoor unit design.
3.1 Introduction
The general principle of the satellite link and outdoor unit design may be summarized by the
following steps as shown in figure 3-1.
Figure 3-1 Steps for Outdoor Unit and Satellite Link Design
Select Satellite Transponder
Start with selecting a suitable satellite transponder (task B1 in figure 3-1). The necessary input
for this task are
-
the geographical location of the earth stations
- information about footprint disadvantages like rain fade or the coverage of the satellite
transponder beam.