SEDSAT-2 Payload

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This is the page for the SEDSAT-2 Payload team. Payload design notes are filed in Category:SEDSAT-2 Payload.

Create new design note: SEDSAT-2 Payload Design Notes 20081015

Contents 1 Team 1.1 Students 1.2 Adviser 1.3 Current Activities 2 Payload Documents 3 Interface Tables 4 Useful links 4.1 SEDSAT-2 4.2 Specifications 4.3 Background info 4.4 Other projects 4.5 Software

Team

The Payload team is made up of students at the University of Wales, Aberystwyth and University of California, Berkeley.

Students

• Tom Nordheim (subsystem leader)
• Torjus Eidet
• Brynjar Larssen
• Jeff Page
• Yuki Takahashi

Adviser

• Dr. Dave Barnes

Current Activities

• Implementing a simple camera application involving image capture and storage.
• Producing an imaging platform for development of flight software.

Payload Documents

• Payload Design Review II is now available (06.04.2008).
• Payload Design Review I is now available (30.12.2007).
• See Primary Payload for details and interface tables.
• Payload Design Concepts.
• See Payload Selection Study for details on the proposed payloads.

Interface Tables

Inputs edit inputs

• To: Payload - Power - 3.3/2.8 VDC. Voltage and current is uncertain until the payload hardware is better defined. It is almost certain that we will include both a microcontroller and FLASH storage in the payload - so power values are not only defined by the CMOS imaging device.
• To: Payload - Control Interface - The interface for the payload will be implented using an I2C busI2C. The CDH controller will have direct access to the Payload flash memory, most likely using SPI.
• To: Payload - Control Command Set - The payload will operate as instructed trough the command set. Typical commands will be; "Power up/down", "Standby", "Set image sensor property N to M", "Capture an image at time X", "Get info about the captured image X", "Start transfer the captured image X at offset Y size Z".

Outputs edit outputs

• From: Payload - Data Output - The MISO of the Payload SPI interface will be the channel for returning requests sent by ODH.

Environments edit environments

• On: Payload - Launch vibrations - Lens system must remain properly aligned.
• On: Payload - Temperature - Electronics will have a limited operating temperature range. Optics may be affected by temperature cycling.

Useful links

SEDSAT-2

• Payload group on ProtoForge
• Imaging payload baselined in ProtoForge
• Meetings scheduled in ProtoForge
• SEDSAT-2 Payload blog

Specifications

• CubeSat Design Specification (~2MB)

Background info

• Objects in earth orbit (~4MB)
• Gravity boom on Wikipedia (rather scanty article, a better source would be appreciated)

Other projects

• Aachen COMPASS-1 (lots of useful info)
  • Phase B Documentation (5MB, but worth the download. Chapters: Payload p. 4, ADCS p. 11, Comms p. 69, CDH p. 97, Power p. 117, Thermal p. 131, Structure p. 173)
• List of cubesat missions (general)
• Cubesat information (general)
• CalPoly PolySat CP2 (nice overview, and check the payload budget at the end!)
• XI-IV and XI-V (immensely successful cubesats from UTokyo)
• UTokyo CubeSat2 aka "PRISM" (interesting optics subsystem)

Software

• ORDEM2000 (orbital debris engineering model from NASA)
• Orbiter (free space flight/orbital mechanics simulator)

Payload Selection Study
Baselined primary: Earth imaging
Recommended primary: Earth imaging • PAL imaging ("doughnut")
Recommended secondary: Deployment imaging • Thermal imaging • Radiation detection
Forwarded to other teams: Telecom relay • Electric propulsion • ACS
Not recommended: Object imaging • ISS beacons • Radio emission detection • Sun/star imaging • Self-imaging • Video
The ideas were evaluated at this meeting The voting took place on Protoforge
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