Papers and Presentations by Bryan Klofas
Research Engineer, SRI International
Electrical Engineering, Cal Poly State University
bklofas (at) gmail.com
- AMSAT-NA Journal - November 2009
- AMSAT-UK Colloquium - July 2009
- Presentation: CP6: T+2 Months and other thoughts. This presentation at the AMSAT-UK Colloquium talked a little bit about the status of CP6, and also described the NRL Payload, CPX Decoder, and survey results. The survey was given out to people using CPX Decoder, just to get a feel what equipment is being used to track CP6.
- CubeSat Developers Conference - April 2009
- Presentation: CubeSat Thermal Environment Chamber. This presentation showed an easy way to build a thermal vacuum chamber for small payloads and CubeSats. It is designed to be very simple to construct, and uses all off-the-shelf products and minimal machining, perfect for universities on a tight budget. Karl van Dyk and Rick Doe, also at SRI International, helped with design and manufacturing of CTEC.
- Documents: CTEC files. Block diagrams, pictures, and parts list for the CubeSat Thermal Environment Chamber.
- CubeSat Developers Conference - April 2008
- Paper: A Survey of CubeSat Communication Subsystems. I wrote this paper, along with Jason Anderson and Kyle Leveque, about all the different comm systems of CubeSats in orbit right now, including the radios used, modulation schemes, successes of each method, and the associated ground stations or ground station networks. It shows that very little data has been downlinked from the CubeSats currently in orbit, and provides some recommendations to future CubeSat developers about their communication subsystem.
- Draft: Earlier version of the above paper, not including the April 2008 CubeSat launch from India, and missing some information on the Japanese CubeSats. It was presented at the 2008 CubeSat Developers Workshop at Cal Poly on 10 April 2008.
- Presentation: Survey of CubeSat Communication Subsystems. Presented during the Groundstation Operations section of the workshop.
- Senior Project - Spring 2008
- Paper: Improving Receive Sensitivity of the CPX Bus. For my Senior Project, under the direction of Professor Dennis Derickson, I increased the receive sensitivity of the satellite by adding a LNA before the CC1000 receiver. We didn't have a LNA on our CP2 and CP3 satellites because we thought it wasn't necessary. The LNA is a Maxim MAX2640, and the bulk of the project was matching the LNA to the board. Both the LNA and board impedances will need to be tested.
- Proposal: Proposal for the project.
- GENSO Workshop - November 2007
- Presentation: Status Update. This short presentation (at Aalborg University in Denmark) to the rest of the GENSO groups describes what we're working on at Cal Poly for the project. This workshop kicks off the Alpha Test phase of the project. The entire project was successfully demoed in front of a live audience (us), and it worked beautifully. The Mission Control Client booked downlink sessions with the Ground Station Server, and the Ground Station Server controlled the radio and rotors at the AAU ground station (across the building). The running Authentication Server authenticated people and registered satellites on the network. The Alpha Test phase starts in December 2007.
- AMSAT Symposium - October 2007
- Paper: GENSO: A Global Ground Station Network. This paper outlines the GENSO theory of operation and goes in depth into how the different work packages interact. Cal Poly is part of Work Package J, tasked with Testing and Verification of the project. This paper was published in the conference proceedings. Graham Shirville G3VZV presented on my paper at the AMSAT Symposium in Pittsburgh, PA, on October 26, 2007.
- SmallSat Conference - August 2007
- Presentation: PolySat: Launch and Operations. This presentation, with Justin Foley during the CubeSat pre-conference workshop at the AIAA/USU Small Satellite Conference in Logan, UT, on August 12, 2007, discusses the recent Dnepr 2 cluster CubeSat launch. This presentation includes lessons learned and on-orbit data. It also gives a in-depth introduction of GENSO, and includes the function of the different servers and how they interact.
- CubeSat Developers Conference - April 2007
- Presentation: PolySat: A University CubeSat Story. Presented with Parin Patel at the CubeSat Developers Workshop in Huntington Beach, CA, on April 20, 2007, this presentation discusses previous launches organized by Cal Poly, the launch failure, and GENSO. This presentation occurred three days after the successful Dnepr 2 launch from Baikonur Cosmodrome in Kazakhstan, so we were still doing preliminary checks on CP4. We hadn't heard from CP3 yet.
- GENSO Workshop - February 2007
- Presentation: Work Package J: GENSO Workshop III. This was presented to the other work packages at GENSO Workshop III at ESTEC in The Netherlands, on February 19, 2007. It outlines what we think we are doing for GENSO, and introduces the other work packages to our earth station. For GENSO, we are in charge of the Testing and Verification Work Package, which includes systems-level testing from both sides, alpha and beta testing, and the construction of a software "satellite simulator," which plugs into Work Package B and tests the network from the satellite all the way to the MCC.
- RMAP Meeting - January 2007
- Presentation: Satellite Communications. The first presentation of the RF, Microwave, and Photonics club at Cal Poly, a club under SPIE. This technical presentation includes a short background on CubeSats, then jumps into detail about the communications system of our CP2 and CP3 satellites, and includes block diagrams and schematics. This presentation was done before the launch (but after the Dnepr 1 launch failure), so we had no idea whether our satellite was going to work or not.
- AMSAT Symposium - October 2006
- Tokyo - July 2006
http://www.klofas.com/papers/index.html
Updated 3 Mar 2010