Team Information Team Members Ajay Chand Jasti Suman Babu
Alapati Vamsi Krishna Guntupalli Naveen Kumar Aluru Karthik
Bhuvanagiri Instructor Dr.Alfredo Perez Davila Mentor Mr. Peter
Armstrong
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Team Members & Roles Ajay Chand Jasti Team Leader and
Programmer Vamsi Krishna Guntupalli Programmer & Documentation
Karthik Bhuvanagiri Research & Testing Suman Babu Alapati Web
developer & Programmer Venkata Naveen Aluru Maintenance &
Testing
Introduction Background: A spacecraft such as the International
Space Station is in a simplified Earth orbit. As the spacecraft
circles the Earth its orientation relative to the Sun continuously
changes. The structure of the spacecraft casts continuously varying
shadows upon the solar arrays.
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Introduction(Cont..) Objective: Graphically model the shading
of sunlight on the solar panels of an orbiting spacecraft.
Analytically determine the area of the solar panels exposed to
sunlight and the resulting incident radiant energy.
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Project Overview We shall create an application that visualizes
the International Space Station in a simplified Earth orbit; The
overall application is implemented in Unity. The proposed
application will determine the area of the solar arrays exposed to
direct sunlight and the amount of power deposited by the sunlight
onto the arrays. Unity is a 3d game engine which would be used for
the above project.
Slide 8
Project Overview(Cont.) Unity, will be used to render the
visualization of the spacecraft. Unity is available on multiple
platforms, including the iPhone/iPod Touch. Figure: Spacecraft
Solar Arrays Shading Visualization
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Requirements The requirements are subdivided into: Functional
requirements Non-functional requirements
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Requirements(Cont..) Functional requirements The application
shall do the following: Computes the position of the sun with
respect to the Earth and ISS. Rotate the ISS such that solar arrays
are perpendicular to the direction of the sun. Numerically display
the shaded area of each solar array, in square meters, and the
percentage of the array that is in sunlight. Display the current
date and time in UTC.
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Requirements(Cont..) The application shall allow the user to
pause the time, reset the time to the element set epoch, reset the
time to the current (real) clock time, and advance the time forward
or backward in 1x, 10x, 100x, and 1000x multiples of real time. The
application shall allow the user to input the epoch (year, month,
day, hour, minute, second in Universal Coordinated Time (UTC)) and
the following Keplerian elements of the ISS: a) semi-major axis in
meters b) eccentricity (unit less number between 0 and 1,
inclusive) c) inclination in degrees d) right ascension of the
ascending node in degrees e) mean anomaly in degrees f) argument of
periapsis in degrees
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Requirements(Cont..) Non - functional requirements The
application is developed in Unity game engine, where we will be
importing the assets like ISS and 3D model of Earth and a point
source of light which will act like sun.
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Environment (tools & technologies) Tools Using Rational
Unified Process Initiated Construction phase TECHNOLOGY AREAS:
Unity 3D graphics Orbital Mechanics
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Tools & Technologies (Cont..) Unity pro 2.6.1 Unity is a 3d
game engine and an authoring tool for creating 3D video games or
other interactive content such as architectural visualizations.
Unity has two important views namely game view and project view.
Game Objects can be imported into the project view and can be
viewed through the game view.
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Project View
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Game View
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Sample Code Of On Mouse Move
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ISS Architecture Figure: International Space Station
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ISS The ISS as of now is the largest satellite orbiting the
earth. The solar alpha rotary joint (SARJ) is the main rotary joint
which allows the solar arrays to track the sun. The following is a
small video showing the external image of the ISS around the
planet.
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Use case diagram
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Use case diagram(Cont..) User controls camera Normal Flow: User
opens the project. User shall enter the position coordinates for
the camera or shall control that by using the GUI. The view shall
be updated to the specified coordinates.
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Use case diagram(Cont..) User inputs epoch Normal Flow: User
opens the project. User shall input the epoch (year, month, day,
hour, minute, second in Universal Coordinated Time (UTC)) User
opens the application in the Unity web browser and then he shall be
able to input the time and control the time and pause the
time.
Slide 23
Architecture Diagram
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Sequence Diagram
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Workflow Diagram
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Project Schedule
Slide 27
Works Completed Created SRS document. Completed the design
phase. Imported the ISS and Earth into Unity.
Slide 28
Future Work Planning to start scripting in Unity. Calculation
of the sun position vector. Numerically calculating the area of the
solar arrays in sunlight. Visualizing the application with the
necessary requirements graphically in Unity.