Digital Commons Network^™

Design And Performance Of The Aero-Vista Magnetometer, Nicholas Belsten, Candence Payne, Rebecca Masterson, Kerri Cahoy, Mary Knapp, Tobias D. Gedenk, Frank D. Lind, Philip J. Erickson

Small Satellite Conference

We describe the design and performance of the magnetometer instrument for the CubeSat mission AERO-VISTA. AERO-VISTA requires in-situ vector magnetic measurements with magnetic precision and repeatability better than 100 nT at a minimum rate of 10 Hz. Our magnetometer system uses the three-axis Honeywell HMC1053 anisotropic magnetoresistive (AMR) sensor. As built, our instrument exhibits intrinsic magnetic noise better than 10 nTrms from 0.1 to 10 Hz, though self-interference effects degrade performance to about 50 nT to 200 nT uncertainty. The analog and mixed signal portion of each magnetometer occupies about 8 square centimeters of circuit board space and draws about …

Low Cost Sar Antenna With Wide Swath And High Ground Resolution, Hirobumi Saito, Kosei Ishimura, Takashi Tomura, Jiro Hirokawa

Small Satellite Conference

This paper describes our developments of SAR (Synthetic Aperture Radar) antennas for low-cost, wide swath and high ground resolution (0.5-0.25m). The antennas are 1D deployable, plane slot array antennas with a wide elevation beam pattern. RF is fed to each panel with a novel patented technology, non-contact waveguide system between panels. These types of SAR antennas make feasible a newly proposed DiskSat with SAR sensor system. The SAR antenna 600MHz bandwidth in X band for 0.5m SAR resolution is made from carbon fiber reinforced plastic (CFRP) for light weight and thermal stability. Furthermore, range resolution improves with wider frequency bandwidth. …

Binar Space Program: Binar-1 Results And Lessons Learned, Fergus Downey, Stuart Buchan, Benjamin Hartig, Daniel Busan, Jacob Cook, Robert Howie, Phil Bland, Jonathan Paxman

Small Satellite Conference

The Binar Space Program is a recently formed space research and education group part of the Space Science and Technology Center at Curtin University in Western Australia. Recently launching the first CubeSat from the state, Binar-1, the team is making steps towards creating a sustainable mission schedule for research and education. The Binar-1 mission primary objective was to demonstrate the custom designed systems made by PhD students and engineers at the university. The main technology being demonstrated was the integrated Binar CubeSat Core, which compacted the Electrical Power System, Attitude Determination and Control System, and flight computer system into 0.25U. …

Initial In-Orbit Operation Result Of Microsatellite Hibari: Attitude Control By Driving Solar Array Paddles, Kei Watanabe, Hiroyuki Kobayashi, Naoki Kawaguchi, Shogo Nerome, Yuki Amaki, Fumitaka Sagawa, Soichi Sato, Kenichiro Takahashi, Yuta Sasagawa, Kiyona Miyamoto, Yoichi Yatsu, Toshihiro Chujo, Saburo Matunaga

Small Satellite Conference

We have developed a 50kg class microsatellite "HIBARI". The mission of this satellite is to demonstrate a novel attitude control method for microsatellites which is called “Variable Shape Attitude Control (VSAC).” VSAC is a method using anti-torque by driving variable shape structures. HIBARI has four drivable solar array paddles, and will demonstrate VSAC.

The development of HIBARI began in 2019, and it was injected into orbit in November 2021 under the Innovative Satellite Technology Demonstration Program led by JAXA. Currently, HIBARI has completed its critical phase and paddle deployment phase, and is conducting paddle drive experiments in orbit. In paddle …

Tartan Artibeus: A Batteryless, Computational Satellite Research Platform, Brad Denby, Emily Ruppel, Vaibhav Singh, Shize Che, Chad Taylor, Fayyaz Zaidi, Swarun Kumar, Zac Manchester, Brandon Lucia

Small Satellite Conference

TTartan Artibeus (TA1) is the first batteryless, computational pocketqube satellite; its open-source hardware and software launched into low-Earth orbit (LEO) in January 2022. TA1 is a 1p (125 cm³) pocketqube built around the Tartan Artibeus Bus (TAB), which connects independently-designed modules into a batteryless, computational satellite. In TA1, TAB incorporates an electrical power supply (EPS) module that harvests solar energy into a supercapacitor, a fault-tolerant command and data handling (C&DH) module, a radio-communication module, and a configurable computational payload module.

The open-source hardware [17] and software [18] of TA1 supports independently designed modules oblivious to the batteryless nature …

Spectral Ocean Color (Spoc): Lessons Learned From The University Of Georgia Small Satellite Research Laboratory's First Satellite, Sydney Whilden, Deepak Mishra, David L. Cotten, Nicholas Neel

Small Satellite Conference

In October 2020, the University of Georgia Small Satellite Research Laboratory launched its first CubeSat, a 3U Earth-observation mission designed to collect multispectral data from Georgia’s coastal environments for UGA’s Center for Geospatial Research to make recommendations on environmental conservation, care, and use. SPOC successfully detumbled, but after approximately a month in orbit, a coronal mass ejection (we speculate) caused us to lose contact. Despite our disappointment at the loss of SPOC, we are leveraging the lessons learned for our upcoming missions. These lessons can be categorized in four principal areas: software (flight and payload), mission operations, testing, and educational …

The Colorado Ultraviolet Transit Experiment: The First Dedicated Ultraviolet Exoplanet Mission, Arika Egan, Kevin France, Nicholas Nell, Nicholas Decicco, Ambily Suresh, Rick Kohnert, Brian T. Fleming, Stefan Ulrich

Small Satellite Conference

The past few years of space mission development have seen an increase in the use of small satellites as platforms for dedicated astrophysical research; they offer unique capabilities for time-domain science and complementary advantages over large shared resource facilities like the Hubble Space Telescope, including: (1) low cost and relatively quick development timelines; (2) observing strategies dedicated to niche but important science questions; and (3) ample opportunity for students and early career scientists and engineers to be involved on the front lines of space mission development. The Colorado Ultraviolet Transit Experiment (CUTE) is a NASA-supported 6U CubeSat assembled …

A Cancer Gene-Drug Connectivity Map For Drbioright, Varshini Vakulabharanam, Hu Chen Phd, Yitao Tang, Jun Li Phd, Han Liang Phd

Summer Experience 2022

No abstract provided.

Nprl2: A New Target In Breast Cancer Treatment, Ana-Sofia Ruiz, Siqi Wu Phd, Guang Peng

Summer Experience 2022

No abstract provided.

Data Validation Of The Nasa Time-Resolved Observations Of Precipitation Structure And Storm Intensity With A Constellation Of Smallsats (Tropics) Pathfinder Microwave Radiometer, Amelia Gagnon, Samantha Hasler, Juliana Chew, William Blackwell, Vince Leslie, Kerri Cahoy

Small Satellite Conference

Launched in June 2021, the TROPICS Pathfinder CubeSat has a microwave radiometer payload sensitive to the frequencies for observing precipitation, humidity, temperature, and cloud ice. The observed brightness temperatures must be compared to a data set of ‘known’ quality to validate the measured data across all channels of the microwave radiometer. This research explores validating TROPICS Pathfinder data against reanalysis data to determine the quality of the provisional TROPICS Pathfinder data product, with an eye for the future of comparing against other microwave radiometer measurements. Validation involves comparing Pathfinder data to ERA5 reanalysis data by using the Community Radiative Transfer …

Design And Assembly Of An Inexpensive Cleanroom For Cubesat Teams, Alexander Leaf, Thomas Ganley, Priya Manavalan, Priya Grewal, Helena Ard, Aditya Shah, Carlos F. Lange

Small Satellite Conference

As space missions become more accessible to student teams through the spread of the CubeSat standard, there is an obvious desire for inexpensive clean spaces for satellite assembly. However, commercially available cleanrooms are costly and may not fit in limited spaces. We present our results and processes from the design, construction and testing of a low-cost cleanroom made of materials readily available at hardware stores.

Our cleanroom was designed to meet ISO 8 or better standards, based on results from previous work by other groups (Johnstone et al., 2007)¹ and requirements for our CubeSat missions. Overall, $2,733.51 CAD was …

Open-Source Software Suite For Small Satellites: C2a (Command Centric Architecture), S2e (Spacecraft Simulation Environment), And Wings (Web-Based Interface Ground-Station Software), Ryo Suzumoto, Satoshi Ikari, Kota Kakihara, Takayuki Hosonuma, Kanta Yanagida, Yuta Sakamoto, Masahiro Fujiwara, Hirotaka Kondo, Kentaro Enokida, Toshihiro Suzuki, Yoshinari Gyu, Hirotaka Sekine, Tomoki Mochizuki, Yutaro Ito, Ryu Funase, Shinichi Nakasuka

Small Satellite Conference

No abstract provided.

Development Of A Simulation Framework For Cubesat Performance Modeling, Mark A. Kurtz, Andrew S. Keys, Kirk W. Johnson

Small Satellite Conference

Space systems are notoriously difficult to develop due to the nature of the environment in which they must operate. Designers have only a limited window to ensure systems will function as intended, placing a high importance on testing. This paper discussed the ongoing development of a simulation framework to support Hardware-in-the-Loop (HIL) testing of CubeSat subsystem hardware. This work is being conducted at the Air Force Institute of Technology (AFIT) in support of the institution’s CubeSat program. The simulation framework is organized into the classic spacecraft subsystems. Each of these subsystems will support a software model and interfaces for the …

Simulation Of Single Gimbal Control Moment Gyroscopes (Sgcmg) Cluster For Microsatellite Maritime Surveillance Mission, Ki Hwan Keum, Regina Lee

Small Satellite Conference

The potential for agile missions for small satellites exists through development of single gimbal control moment gyroscopes (SGCMG). An SGCMG cluster comes with additional complexity and volume requirements, but efforts in their development have reduced their overall size while providing higher torque over similarly sized reaction wheels. In this paper, we present a feasibility study of a small satellite using a small volume pyramid SGCMG cluster for coastline monitoring through Simulink. Two realistic torque profiles for sweeping capture of complex coastlines within one minute were generated using STK, requiring maximum torques of 0.190 and 0.218 Nm and rapid slew rate. …

Comparison Of The Low-Cost Sun Sensors Of The Source And Eive Cubesats, Nils Pentke, Joelle Schaefer, Timon Karl-Heinz Schwarz, Markus T. Koller, Steffen Gaisser, Sabine Klinkner

Small Satellite Conference

Sun sensors are commonly used attitude determination equipment which measure a spacecraft’s attitude relative to the sun. Multiple types of low-cost sun sensors were developed for the SOURCE and EIVE CubeSats. The SOURCE sun sensors consist of single photodiodes which are placed in a one-sensor-per-face as well as a pyramid arrangement. EIVE employs digital vector sun sensors based on quad-pin photodiodes. The SOURCE sun sensors in the one-sensor-per-face arrangement archive an accuracy of <10° while the pyramid arrangement accomplishes an accuracy of <7.5° without and <5° with calibration. EIVE’s vector sun sensors offer an raw accuracy of 3°±5°. Multiple calibration approaches are presented with the best results leading to an accuracy of 0.7±3°. A direct comparison between the SOURCE and EIVE sensor types and configurations can be drawn since the same test bench was used to measure all sensors. The objective of this paper is to present and compare the different sun sensor concepts and their results.

Development Of A Prelude Satellite Equipped With Electric Field And Plasma Measurement Sensors Based On Statistical Evaluation Of Seismic Precursors Using Artificial Vlf Radio Waves Obtained From In-Orbit Observations, Tomoyuki Iida, Masahiko Yamazaki, Masashi Kamogawa

Small Satellite Conference

In this paper, we focus on the artificial VLF radio wave and show the result of the evaluation of the signal intensity decrease by the effect of ionospheric fluctuation, which is regarded as a sign phenomenon of earthquake occurrence. This paper also describes the mission design of Prelude (Precursor electric field observation CubeSat demonstrator) which is aiming at elucidation of the precursory mechanism of earthquake, and the development situation of hybrid sensor (electric field and plasma measurement) which is a mission instrument.

We focused on the artificial VLF wave, in which the electromagnetic wave itself does not affect the ionosphere, …

The Sum Of The Parts: Lessons Learnt From Designing And Building A 3.7 Metre S/X-Band Antenna, Kerry Clapham, Robin Mcneill, Chris Hann

Small Satellite Conference

A redundant 2.2m Cossor weather radar was made available to us. After some initial experimentation tracking NOAA weather satellites, we challenged ourselves to convert it into a reliable high performance S/X-Band Station suitable for supporting LEO missions. A new reflector, horn feed, RF chain, motors and gearing were specified, designed and installed during the upgrade. Modern control software was written to command the new antenna.

We found that designing and assembling such a system is educational at a both a systems and component level. In particular, at X-Band we found there is little margin for errors where many small details, …

A High Precision Accelerometer With An Optical Readout, Abdulrahman Alfauwaz, Sasha Buchman, John Lipa

Small Satellite Conference

Geodesic missions require precise accelerometers to improve the knowledge of the reference frame used for defining position coordinates, better calculating orbit parameters, and mapping the Earth’s gravitational field. Although space environment disturbances are typically relatively small, they generate large and significant accumulated drift errors over time. We describe a low noise accelerometer design that overcomes many of the limitations of existing designs and is capable of providing precision drag-free control in vehicles with thrusters. Furthermore, it can be used with some modifications, including active thermal control, to detect gravitational waves in an interferometer using drag-free satellites. Due to its flexible …

Spoac And Hinge Integrated Msac: Non-Holonomic Attitude Control Systems For Spacecraft, Abbas Bataleblu, Elena Fernández Bravo, Vedant, James T. Allison

Small Satellite Conference

Two novel spacecraft attitude control system technologies are introduced that both rely on the same nonholonomic control trajectory concept but that utilize distinct system implementations. The first of these two technologies is Hinge Integrated Multifunctional Structures for Attitude Control (MSAC), which is a new attitude control system that utilizes deployable panels to provide a spacecraft with both fine pointing and large angle slewing attitude control capabilities. Given its potential for high reliability and these control capabilities, Hinge Integrated MSAC is a viable alternative to conventional momentum exchange-based attitude control systems. This study details the Technology Readiness Level (TRL) advancement for …

Methods For Data-Centric Small Satellite Anomaly Detection And Fault Prediction, Joseph Melville, Joel B. Harley, Michael Lopez, Michael Crabtree, Seth Lacy

Small Satellite Conference

Autonomy can increase reaction speed, flexibility, and accuracy of satellite operations, especially in uncertain environments caused by delayed communication and/or adversarial conditions. An increased focus on small satellites makes the development of satellite autonomy even more salient, given fewer operators per satellite.

Anomaly detection automates satellite health monitoring, ensuring it functions as designed. This is typically achieved using various forms of recurrent neural networks (RNN). While many of these model-based works show promise, a majority use simulated data or assume lossless communication. In contrast, raw satellite telemetry often has dropped packets, sampling frequency mismatches, noise from electrical systems and radiation, …

Cubesat Single-Photon Detector Module For Performing In-Orbit Laser Annealing To Heal Radiation Damage, Nigar Sultana, Joanna Krynski, Jin Gyu Lim, Vadim Makarov, Thomas Jennewein, Logan M. Power, John Floyd, Michael Lembeck, Paul Kwiat

Small Satellite Conference

Silicon-based single-photon avalanche photodiodes (SPADs), widely considered for satellite-based quantum communications, suffer a constant increase of dark count rate (DCR) from radiation-induced proton displacement damage in their active areas. When this accumulated damage causes the DCR to exceed a certain threshold (for example, 10,000 counts per second), the SPADs become unreliable for quantum communications, limiting mission lifetime. Previous ground experiments showed that radiation-induced DCR of synthetically irradiated SPADs could be significantly improved by high-power laser annealing, a localized heating of SPADs’ active areas using a focused laser beam. The next step is therefore to demonstrate realtime laser annealing on constantly …

Influence Of The Use Of Library Resources And Services On Postgraduate Students Research In Two Nigerian Universities, Effiowan Elizabeth Ekong Mrs, Kuburat Olayinka Ogunode Mrs

Library Philosophy and Practice (e-journal)

The study investigated the library services and use of information resources as influencing factors on effective research by postgraduate students in two Nigerian Universities. The study adopted a descriptive survey designed, questionnaire was used for the data collection. A total of 250 questionnaire were distributed across the two universities using the simple random sampling technique while 216 copies retrieved were used for the analysis. The study observed that factors influencing library use have a negative and significant association (r = -0.248, n =142, p< 0.05) with challenges faced when using the library and a positive significant association (r = 0.256, n = 139, p < 0.05) with postgraduate students use of university library. The study also found out that postgraduate students use of university library have a positive and insignificant relationship ( = 0.042, 0.378, p> 0.05) with intensity of library information resources but show a positive and significant relationship ( 0.231, …

Fabrication Of Catalyst Infused Filament For 3-D Printing Of Hybrid Rocket Fuels, Kurt C. Olsen, Stephen A. Whitmore, Brayden Barton

Small Satellite Conference

Additive manufacturing changes the electrical breakdown properties of certain 3D-printed thermoplastics like Acrylonitrile Butadiene Styrene (ABS), and when printed materials are presented with a high-voltage electrical potential, electrical-arcing along the layered surface pyrolizes the material. This electrostatic property has been harnessed to develop a High-Performance Green Hybrid Propulsion (HPGHP) technology that has capability for reliable start, stop, and re-ignition. HPGHP operates reliably using gaseous oxygen (GOX) as the complementing oxidizer; but has experienced reliability and ignition latency issues when GOX is replaced by Nytrox, a higher-density blend of nitrous oxide and GOX. Ignition issues are overcome by infusing small amounts …

Fatigue Life Predictions Of Additively Manufactured Components For Satelite Structures, Daniel G. Miller, Ryan A. Kemnitz, Ramana V. Grandhi, Luke C. Sheridan

Small Satellite Conference

The fatigue life properties of Additive Manufactured (AM) components are limited due to the defects naturally generated from the AM Process. For limited design life problems the finite fatigue life El-Haddad model linked defect size, applied stress, and design life. This paper developed a method to predict the smallest defect of interest for a given load case and the lowest failure generating stress for a given defect size. Experimental testing validated the method steps. The model was adjusted to demonstrate the space utility based on a 12U CubeSat chassis. Applying the design life and expected load, the finite fatigue life …

Autonomous System-Level Fault Diagnosis In Satellites Using Housekeeping Telemetry, Evana Gizzi, Hayley Owens, Nicholas Pellegrino, Christopher Trombley, James Marshall, Jivko Sinapov

Small Satellite Conference

To continue the growing success of scientific discovery through deep space exploration, missions need to be able to be able to travel further and operate more efficiently than ever before. To ensure resilience in this capability, on-board autonomous fault mitigation methods must be developed and matured. To this end, we present a system for cross-subsystem fault diagnosis of satellites using spacecraft telemetry. Our system leverages a combination of Kalman Filters, Autoencoders, and Causality algorithms. We test our system for accuracy against three data sets of varying complexity levels, along with baseline testing. Additionally, we perform an ablation study to evaluate …

A University Deep Space Cubesat Mission: Lessons Learned From The University Of Colorado Boulder Earth Escape Explorer (Cu-E3), Brodie Wallace, Scott Palo, John Sobtzak

Small Satellite Conference

The University of Colorado Boulder Earth Escape Explorer (CU-E³) CubeSat is a student designed and built CubeSat initially slated for launch into deep space on Artemis-1, the inaugural launch of the NASA Space Launch System (SLS). CU-E³ was designed to compete in the Cube Quest Challenge’s (CQC) Deep Space Derby for monetary prizes associated with deep space communication system performance, while also serving as a technology demonstration platform for a series of innovative university CubeSat technologies and practices, including a low-cost X-band CubeSat transmitter, an X-band reflectarray antenna, and the use of solar radiation pressure to control …

Comparative Antiplatelet Effects Of Chlorthalidone And Hydrochlorothiazide, Khalid Bashir, Tammy Burns, Samuel J. Pirruccello, Sarah J. Aurit

Department of Statistics: Faculty Publications

Chlorthalidone (CTD) may be superior to hydrochlorothiazide (HCTZ) in the reduction of adverse cardiovascular events in hypertensive patients. The mechanism of the potential benefit of CTD could be related to antiplatelet effects. The objective of this study was to determine if CTD or HCTZ have antiplatelet effects. This study was a prospective, double-blind, randomized, three-way crossover comparison evaluating the antiplatelet effects of CTD, HCTZ, and aspirin (ASA) in healthy volunteers. The effects of these treatments on platelet activation and aggregation were assessed using a well-established method with five standard platelet agonists. Thirty-four patients completed the three-way crossover comparing pre- and …

Feminism, Femininity, And Arkansas First Ladies: Hillary Rodham Clinton And Janet Mccain Huckabee, Spencer A. Hurlbut

ATU Theses and Dissertations 2021 - Present

Through the 1970s and into the 2000s, Hillary Clinton and Janet Huckabee served as first ladies. Their husbands were elected and ran campaigns for Arkansas Governor and President of the United States. While the two men were the elected officials that constituents cast their votes for on election day, Hillary and Janet were beside the men playing a tremendous role in securing or discouraging votes. Third wave feminism ran rampant throughout these two decades and resulted in higher numbers of women in the workforce, later years of marriage, less children, and greater awareness of sexual harassment and sex discrimination. Hillary …

Ready, Set, Go...Wildfire Preparedness And Public Libraries, Kellian Clink

Library Services Publications

A distillation of tips from the state/provincial fire preparedness agencies will be presented. Recommendations for programming for public libraries to build bridges with fire educators are offered, along with ideas on how to display materials that might describe what important papers should be in go-bags, how to drive out of a wildfire, and how to have a game plan for home, work, daycare, kids, and critters. Provincial and state specific resources will be included in a pathfinder, along with a selection of titles of books, articles, and websites about fire awareness.

Haleys Support Accountancy's New Home, Tina H. Hahn

University of Mississippi News

Naming of terrace at school's planned building will honor couple