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MIT16_842F09_assn2

# MIT16_842F09_assn2 - Vehicle Design and Performance You may...

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Vehicle Design and Performance You may solve either question (a), which deaIs with the design of a communications satellite or question (b), which deals with the design of an unmanned aeriaI vehicle (UAV). Both questions are equivaIent in terms of degree of difficulty and methodology.

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(a) Spacecraft Design Problem You should assist in the design of a communications satellite at geosynchronous altitude S, see Figure 1. The performance requirement is a transmission data rate of &,, = 100 [Mbps]&20% at a radio frequency of f = 2 [GHz]'. The satellite is made up of a solar panel of area A [m2] with efficiency m, a standard bus that consumes Pbus power, and a parabolic antenna of diameter D [m] with transmission efficiency qt. S=35786 [km] GEO altitude Earth Satellite sdar c=3 .lo8 [m/s] speed of light W, = 1358 w/m2] solar constant solar panel efficiency Ph, =300 bus power = 0.8 transmission efficiency 1-78 (h] a = 2.4 . 10" [J-'1 link constant Figure 1: Geosynchronous communications satellite with important constants Tt is your job to negotiate between the power and payload teams to find a solution for the design vector x = [D A]" that will satisfy the performance requirement fie*, while not violating any constraints. Some equations that might be useful are given below, where A is the electromagnetic wavelength [m] and PA is the power generated by the solar panel: data rate
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MIT16_842F09_assn2 - Vehicle Design and Performance You may...

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