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Jet Propulsion Laboratory

JPL Flight Team

Adam Nikolic

Josh Ruggiero

Bob Hoffman

Dusty Terrill

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Jet Propulsion Laboratory

Completed so far

• Schedule

• Initial research

• Architecture Description

• System requirement document

• Created CVS Server

• System design

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Jet Propulsion Laboratory

Schedule - Done

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Jet Propulsion Laboratory

Schedule - Not Done

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Jet Propulsion Laboratory

Initial Research

• Standards and requirements

– CCDCS for communication

– IEEE 1471 for architecture description

– VML2

• Basics of space flight

– Satellite components and configuration

– Orbit patterns and flight mechanics

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Jet Propulsion Laboratory

Architecture Description

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Jet Propulsion Laboratory

System Requirement Document

• Flight Requirements:

• The flight system shall track and analyze changes in terrestrial features

• The flight system shall use a 5-10m resolution

• The flight system shall moderate cost

• The flight system shall use 1500 x 1500 picture resolution

• The flight system shall be able to take visible and infrared images

• The flight system shall accept targets from Mission Control

• The flight system shall create flight path from Mission Control targets

• The flight system shall send health/status information to Mission Control

• The flight system shall use JPEG image format

• The flight system shall send an image to Mission Control once it has been taken image

• The flight system shall send the following information as health/status information:

• Fuel (Kg/g), Velocity (km/s), Altitude (km), Battery Power (mW), Power Consumption (mW/H), number of reads, number of writes, how much free memory (GBytes), and position (spherical coordinates).

• The flight system shall accept image request from Mission Control

• The flight system shall accept a request for a TIFF or BMP image from Mission Control and then send the specified image format.

• The flight system shall minimize power usage

• The flight system shall design a propulsion system

• The flight system shall design a navigation system

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Jet Propulsion Laboratory

System design

• Memory – 2 separate memory modules (assuming 1 million writes per module)

• Maximum bmp memory – 2MB

• Status info/data

– Fuel (Kg/g) – (Capacity 26Kg) – 15 bits

– Velocity (m/s) – (Max around 7600 m/s) - 13 bits

– Altitude (km) – (900km max height) – 10 bits

– Battery Power (mW) – (850W x 2 batteries) – 11 bits

– Power Consumption (mW/H) – (max can use is 1700) – 11 bits

– number of reads – (3 million reads) – 22 bits

– number of writes – (1 million writes x 2) – 40 bits

– Position (spherical coordinates) – (max 360°) – 9 bits

– ground control commands – (Location to move to) – 24 bits

• Power – Power consumption info

• Four deployable, fixed solar panels and one body-mounted panel contain 3.4 m2 of solar cells and provide 230 W/hr of orbital average power

• 2 batteries (.5 m3) each provide 850W/hr power, takes 3 hours to charge.

• Consumptions uses:

• -Antenna: 25W per transmission

• -CPU: 50W

• -Thrusters: 100W per course correction

• -Camera: 30W

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Jet Propulsion Laboratory

Left to do

This Semester

Finish overall system design

Start working on UML diagrams

Use cases and class diagrams

Start making schedule for next semester

Next Semester

Code

Code

Code