Space Vehicles Commons^™

Modeling The Thermosphere As A Driven-Dissipative Thermodynamic System, William R. Frey, C. S. Lin, Matthew B. Garvin, Ariel O. Acebal

Faculty Publications

Thermospheric density impacts satellite position and lifetime through atmospheric drag. More accurate specification of thermospheric temperature, a key input to current models such as the High Accuracy Satellite Drag Model, can decrease model density errors. This paper improves the model of Burke et al. (2009) to model thermospheric temperatures using the magnetospheric convective electric field as a driver. In better alignment with Air Force satellite tracking operations, we model the arithmetic mean temperature, T _1/2, defined by the Jacchia (1977) model as the mean of the daytime maximum and nighttime minimum exospheric temperatures occurring in opposite hemispheres at a …

Eps Simulator, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on the "EPS Similator" on March 24, 2014.

Feasibilty Of Very Large Sparse Aperture Depolyable Antennas, Jason C. Heller

Theses and Dissertations

The objective of this research is to explore the technical soundness of a very large, cross-shaped, parabolic, sparse aperture antenna extending 75 m from the bus. Specifically, describing the environment of the satellite, the effect of fabrication error on the structure and the remaining error budget for the system. The methodology involves creation of an ideal truss structure, to which all others are compared. A uniform distribution of proportional errors up to 1e-5 is introduced into the truss members' lengths and the models are subjected to a static Finite Element Analysis. A solution for the surface normal error is addressed …

Comm-Using Decibels - Loose Slides, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Comm-Using Decibles - Loose Slides" from March 13. 2014.

Overview Of Eps, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on an "Overview of EPS" of March 10, 2014.

Communication Protocols, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Communication Protocols" from March 8, 2014.

Comm-Processing Data, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Comm-Processing Data" from March 3, 2014.

Antennas - Loose Slides, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Antennas" from March 2, 2014.

Could We Colonize Venus?, Nihad E. Daidzic

Aviation Department Publications

No abstract provided.

Development Of Safety Standards For Cubesat Propulsion Systems, Liam Jon Cheney

Master's Theses

The CubeSat community has begun to develop and implement propulsion systems. This movement represents a new capability which may satisfy mission needs such as orbital and constellation maintenance, formation flight, de-orbit, and even interplanetary travel. With the freedom and capability granted by propulsion systems, CubeSat providers must accept new responsibilities in proportion to the potential hazards that propulsion systems may present.

The Cal Poly CubeSat program publishes and maintains the CubeSat Design Specification (CDS). They wish to help the CubeSat community to safety and responsibly expand its capabilities to include propulsive designs. For this reason, the author embarked on the …

Data Link For Palamede Spacecraft Based On The Orbcomm Constellation As Space Infrastructure, Franco Bernelli-Zazzera

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Franco Bernelli-Zazzera on "Data link for Palamede spacecraft based on the Orbcomm constellation as space infrastructure" from February 21, 2014.

Galileo, The European Global Navigation Satellite System:Status And Challenges, Marco Lisi

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Marco Lisi on "Galileo, the European Global Navigation Satellite System:Status and Challenges" from February 20, 2014.

Infrastructure For Planetary Science, Carle M. Pieters

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Carle M. Pieters on "Infrastructure for Planetary Science" from February 20, 2014.

Current Developments In Space Infrastructure: Space Horizons 2014, Mason Peck

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Mason Peck on "Current Developments in Space Infrastructure: Space Horizons 2014" from February 20, 2014.

Quasars And Pulsars And Masers (Oh, My!), Michael Hecht

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Michael Hecht on "Quasars and Pulsars and Masers (Oh, my!)" from February 19, 2014.

Pocketqubes: Access To Space Infrastructure For Small Organizations, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "PocketQubes: Access to space infrastructure for small organizations" from February 19, 2014.

Pocketqubes: Access To Space Infrastructure For Small Organizations, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "PocketQubes: Access to space infrastructure for small organizations" from February 19, 2014.

Comm-Link Equations - Loose Slides, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Comm-Link Equations" from February 13, 2014.

Computer Data Busses, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Computer Data Busses" from February 13, 2014.

Commincations - Deicibel, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Comminications - Decibel" from February 11, 2014.