UVSQ-SAT, a Pathfinder CubeSat Mission for Observing Essential Climate Variables

Meftah, Mustapha; Damé, Luc; Keckhut, Philippe; Bekki, Slimane; Sarkissian, Alain; Hauchecorne, Alain; Bertran, Emmanuel; Carta, Jean Paul; Rogers, David P.; Abbaki, Sadok; Dufour, Christophe; Gilbert, Pierre; Lapauw, Laurent; Vieau, André Jean; Arrateig, Xavier; Muscat, Nicolas; Bove, P.; Sandana, Éric; Téherani, F. Hosseini; Li, Tong; Pradel, Gilbert; Mahé, Michel; Mercier, Christophe; Paskeviciute, Agne; Segura, Kevin; Alba, A. Berciano; Aboulila, Ahmed; Chang, Loren C.; Chandran, Amal; Dahoo, Pierre‐Richard; Bui, Alain

doi:10.3390/rs12010092

Cited by 17 publications

(40 citation statements)

References 44 publications

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“…The main goal of the UVSQ-SAT pathfinder mission is to determine the Terrestrial Net Radiation using remote sensors. The UVSQ-SAT CubeSat described in [1] Teach' Wear (TW) is a new three axis accelerometer/gyroscope/compass. The TW module on-board UVSQ-SAT has an instrumentation that will be very helpful to determine the reference position during the training phase such as: a three-axis accelerometer, a three-axis gyrometer, and a three-axis magnetometer.…”

Section: Methods To Retrieve Terrestrial Net Radiation For Satellite Tmentioning

confidence: 99%

“…UltraViolet & infrared Sensors at high Quantum efficiency on-board a small SATellite (UVSQ-SAT) is a pioneering space-based mission to demonstrate technologies for broadband measurements of Earth Radiation Budget (ERB) [1]. The mission is part of the International Satellite Program in Research and Education (INSPIRE).…”

Section: Introductionmentioning

confidence: 99%

“…At the present stage, the UVSQ-SAT CubeSat is a demonstrator, expecting future developments and improvements that would then really allow for making use of CubeSat technology for these scientific purposes. The expected performances for UVSQ-SAT are to measure the EEI with a stability per year of ±5 Wm −2 at 1σ [1]. The UVSQ-SAT EEI expected performances depend on the error budget of several parameters.…”

Section: Introductionmentioning

confidence: 99%

“…There are two different strategies to measure and recover all Earth radiative fluxes (solar, albedo, infrared) from UVSQ-SAT sensors. The first one is to compute an average flux on the six different faces of the CubeSat as explained in details by [1]. However, this method implies identical responsivity and the same bidirectional reflectance distribution function (BRDF) for all sensors of all faces of the CubeSat.…”

Section: Introductionmentioning

confidence: 99%

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A New Method Based on a Multilayer Perceptron Network to Determine In-Orbit Satellite Attitude for Spacecrafts without Active ADCS Like UVSQ-SAT

et al. 2021

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Climate change is largely determined by the radiation budget imbalance at the Top Of the Atmosphere (TOA), which is generated by the increasing concentrations of greenhouse gases (GHGs). As a result, the Earth Energy Imbalance (EEI) is considered as an Essential Climate Variable (ECV) that has to be monitored continuously from space. However, accurate TOA radiation measurements remain very challenging. Ideally, EEI monitoring should be performed with a constellation of satellites in order to resolve as much as possible spatio-temporal fluctuations in EEI which contain important information on the underlying mechanisms driving climate change. The monitoring of EEI and its components (incoming solar, reflected solar, and terrestrial infrared fluxes) is the main objective of the UVSQ-SAT pathfinder nanosatellite, the first of its kind in the construction of a future constellation. UVSQ-SAT does not have an active determination system of its orientation with respect to the Sun and the Earth (i.e., the so-called attitude), a prerequisite in the calculation of EEI from the satellite radiation measurements. We present a new effective method to determine the UVSQ-SAT’s in-orbit attitude using its housekeeping and scientific sensors measurements and a well-established deep learning algorithm. One of the goals is to estimate the satellite attitude with a sufficient accuracy for retrieving the radiative fluxes (incoming solar, reflected solar, terrestrial infrared) on each face of the satellite with an uncertainty of less than ±5 Wm−2 (1σ). This new method can be extended to any other satellites with no active attitude determination or control system. To test the accuracy of the method, a ground-based calibration experiment with different attitudes is performed using the Sun as the radiative flux reference. Based on the deep learning estimation of the satellite ground-based attitude, the uncertainty on the solar flux retrieval is about ±16 Wm−2 (1σ). The quality of the retrieval is mainly limited by test conditions and the number of data samples used in training the deep learning system during the ground-based calibration. The expected increase in the number of training data samples will drastically decrease the uncertainty in the retrieved radiative fluxes. A very similar algorithm will be implemented and used in-orbit for UVSQ-SAT.

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Section: Methods To Retrieve Terrestrial Net Radiation For Satellite Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Method Based on a Multilayer Perceptron Network to Determine In-Orbit Satellite Attitude for Spacecrafts without Active ADCS Like UVSQ-SAT

et al. 2021

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“…The authors would like to thank the anonymous reviewer for useful suggestions throughout this study and for the thoughtful comments. This work is useful for the preparation of the UVSQ-SAT (Meftah et al, 2019) and MicroCarb missions.…”

mentioning

confidence: 99%

SOLAR-v: A new solar spectral irradiance dataset based on SOLAR/SOLSPEC observations during solar cycle 24

Meftah

Snow

Damé

et al. 2020

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Context. Solar spectral irradiance (SSI) is the wavelength-dependent energy input to the top of the Earth's atmosphere. Solar ultraviolet (UV) irradiance represents the primary forcing mechanism for the photochemistry, heating, and dynamics of the Earth's atmosphere. Hence, both temporal and spectral variations in solar UV irradiance represent crucial inputs to the modeling and understanding of the behavior of the Earth's atmosphere. Therefore, measuring the long-term solar UV irradiance variations over the 11-year solar activity cycle (and over longer timescales) is fundamental. Thus, each new solar spectral irradiance dataset based on long-term observations represents a major interest and can be used for further investigations of the long-term trend of solar activity and the construction of a homogeneous solar spectral irradiance record. Aims. The main objective of this article is to present a new solar spectral irradiance database (SOLAR-v) with the associated uncertainties. This dataset is based on solar UV irradiance observations (165-300 nm) of the SOLAR/SOLSPEC space-based instrument, which provides measurements of the full-disk SSI during solar cycle 24. Methods. SOLAR/SOLSPEC made solar acquisitions between April 5, 2008 and February 10, 2017. During this period, the instrument was a↵ected by the harsh space environment that introduces instrumental trends (degradation) in the SSI measurements. A new method based on an adaptation of the Multiple Same-Irradiance-Level (MuSIL) technique was used to separate solar variability and any uncorrected instrumental trends in the SOLAR/SOLSPEC UV irradiance measurements. Results. A new method for correcting degradation has been applied to the SOLAR/SOLSPEC UV irradiance records to provide new solar cycle variability results during solar cycle 24. Irradiances are reported at a mean solar distance of 1 astronomical unit (AU). In the 165-242 nm spectral region, the SOLAR/SOLSPEC data agrees with the observations (SORCE/SOLSTICE) and models (SATIRE-S, NRLSSI 2) to within the 1-sigma error envelope. Between 242 and 300 nm, SOLAR/SOLSPEC agrees only with the models.

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The INSPIRESat-1: Mission, science, and engineering

Chandran¹,

Fang²,

Chang³

et al. 2021

Advances in Space Research

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UVSQ-SAT, a Pathfinder CubeSat Mission for Observing Essential Climate Variables

Cited by 17 publications

References 44 publications

A New Method Based on a Multilayer Perceptron Network to Determine In-Orbit Satellite Attitude for Spacecrafts without Active ADCS Like UVSQ-SAT

A New Method Based on a Multilayer Perceptron Network to Determine In-Orbit Satellite Attitude for Spacecrafts without Active ADCS Like UVSQ-SAT

SOLAR-v: A new solar spectral irradiance dataset based on SOLAR/SOLSPEC observations during solar cycle 24

The INSPIRESat-1: Mission, science, and engineering

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