Damping And Vibrations Experiment (DAVE): On-Orbit Performance of a CubeSat Particle Damper

The Damping And Vibrations Experiment (DAVE) is a 1U CubeSat designed to study the performance of particle damping technology in the space environment. Particle dampers rely on the free movement and collision of particles and, as such, are influenced significantly by gravitational effects on Earth. Damper performance was characterized using a single degree of freedom cantilever beam experiment. Beams were equipped with particle dampers and then excited to produce a response at various input amplitudes and frequencies. The on-orbit response of the system was compared to a theoretical model of particle damping as well as ground and ZERO-G flight test data in order to ascertain the degree of non-linearity of the system

A Deeper Look into the Ionospheric Scintillation eXplorer (ISX): A Failure Analysis

The Ionospheric Scintillation eXplorer (ISX) mission is a collaboration between SRI International and Cal Poly. The ISX space weather investigation seeks to better understand the physics of naturally occurring Equatorial Spread F ionospheric irregularities by deploying a passive UHF radio scintillation receiver. Rocket Lab’s Electron-4 launch vehicle successfully placed ISX into a nearly sun synchronous orbit 500km above the surface of the Earth, however contact was never made with the spacecraft. Since this anomaly, Cal Poly has taken an extensive look into the possible failure causes on ISX, including a system level fault tree and additional testing with the engineering test unit. The primary takeaway from the failure analysis is the importance of testing beyond what is considered normal for CubeSats. The second main conclusion reinforces the important role that adequately documenting the spacecraft design, fabrication, and testing plays in performing a post hoc failure analysis. In addition to presenting analysis outcomes, this paper addresses both of these main takeaways

SPHEREx: NASA's near-infrared spectrophotometric all-sky survey

SPHEREx, the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and ices Explorer, is a NASA MIDEX mission planned for launch in 2024. SPHEREx will carry out the first all-sky spectral survey at wavelengths between 0.75µm and 5µm with spectral resolving power ~40 between 0.75 and 3.8µm and ~120 between 3.8 and 5µm At the end of its two-year mission, SPHEREx will provide 0.75-to-5µm spectra of each 6.”2 x 6.”2 pixel on the sky - 14 billion spectra in all. This paper updates an earlier description of SPHEREx presenting changes made during the mission's Preliminary Design Phase, including a discussion of instrument integration and test ow and a summary of the data processing, analysis, and distribution plans

Noise Reduction Methods for Large-scale Intensity-mapping Measurements with Infrared Detector Arrays

Intensity-mapping observations measure galaxy clustering fluctuations from spectral–spatial maps, requiring stable noise properties on large angular scales. We have developed specialized readouts and analysis methods for achieving large-scale noise stability with Teledyne 2048 × 2048 H2RG infrared detector arrays. We designed and fabricated a room-temperature low-noise ASIC Video8 amplifier to sample each of the 32 detector outputs continuously in sample-up-the-ramp mode with interleaved measurements of a stable reference voltage that remove current offsets and 1/ f noise from the amplifier. The amplifier addresses rows in an order different from their physical arrangement on the array, modulating temporal 1/ f noise in the H2RG to high spatial frequencies. Finally, we remove constant signal offsets in each of the 32 channels using reference pixels. These methods will be employed in the upcoming SPHEREx orbital mission that will carry out intensity-mapping observations in near-infrared spectral maps in deep fields located near the ecliptic poles. We also developed a noise model for the H2RG and Video8 to optimize the choice of parameters. Our analysis indicates that these methods hold residual 1/ f noise near the level of SPHEREx photon noise on angular scales smaller than ∼30′

The Cosmic Infrared Background ExpeRiment-2: First Flight Status Report

240th meeting of the AAS, on June 12–16, Californi

SPHEREx: NASA's near-infrared spectrophotometric all-sky survey

SPHEREx, the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and ices Explorer, is a NASA MIDEX mission planned for launch in 2024. SPHEREx will carry out the first all-sky spectral survey at wavelengths between 0.75μm and 5μm with spectral resolving power ∼40 between 0.75 and 3.8μm and ∼120 between 3.8 and 5μm At the end of its two-year mission, SPHEREx will provide 0.75-to-5μm spectra of each 6."2x6."2 pixel on the sky - 14 billion spectra in all. This paper updates an earlier description of SPHEREx presenting changes made during the mission's Preliminary Design Phase, including a discussion of instrument integration and test ow and a summary of the data processing, analysis, and distribution plans.This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]