Presented By: Capstone Team1

minedesertSoftware and s/w Development

Oct 31, 2013 (3 years and 9 months ago)

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Presented By: Capstone Team1

Date: 03/05/2010

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


Team Members & Roles


Ajay
Chand

Jasti




Team Leader and


Programmer


Vamsi

Krishna
Guntupalli



Programmer &







Documentation


Karthik

Bhuvanagiri



Research &


Testing



Suman

Babu

Alapati


We
b developer &






Programmer


Venkata

Naveen

Aluru


Maintenance &


Testing

Agenda


Introduction


Background


Objective


Project Overview


Requirements


Functional Requirements


Non
-
functional Requirements


Environment (tools and technologies)


Architecture


Project Schedule


Future Work


References

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
.


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.


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.




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

Requirements

The requirements are subdivided into:



Functional requirements



Non
-
functional requirements






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.

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



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.


Environment (tools & technologies)



Tools



Using Rational Unified Process

Initiated Construction phase



TECHNOLOGY AREAS:



Unity


3D graphics


Orbital Mechanics


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.

Project View

Game View

Sample Code Of On Mouse Move

ISS Architecture

Figure: International Space Station

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.


Use case diagram

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.



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.


Architecture Diagram

Sequence Diagram

Workflow Diagram

Project Schedule

Works Completed




Created SRS document.


Completed the design phase.


Imported the ISS and Earth into Unity.


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.


References


http://unity3d.com/unity/features/iphone
-
publishing


http://www.nasa.gov/mission_pages/station/main/index.html


http://3dbuzz.com/forum.html


http://unity3d.com/support/documentation/Manual/index.html