Sun oriented and powered, 3 axis and spin stabilized CubeSats

Falbel, Gerald; Puig‐Suari, Jordi; Peczalski, A.

doi:10.1109/aero.2002.1036864

Cited by 13 publications

(14 citation statements)

References 1 publication

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“…In accordance with reports [4] and [5], the maximum spin for a CubeSat has been estimated to be up to 1.1 revolutions per second (400 /s). Therefore, to guarantee that transmitted frames will not be lost due to this sudden polarization change, their length must be reduced.…”

Section: Introductionsupporting

confidence: 57%

“…Since computing of both frames is performed sequentially, the software assumes that two frames received within a time period of " " seconds have been received at the same time with both polarizations. For the XaTcobeo spacecraft, with a data rate of 1200 bps, a frame length of 320 bits, and a propagation delay smaller than 10 ms (circular orbit, 1500 km of altitude, 15 of minimum antenna elevation), the value of this time period ( ) must be smaller than (4) This software always transmits a frame with the polarization of the last frame correctly received. Therefore, the decision is based on the latest known polarization and does not take into account the SNR level of the received frames.…”

Section: B Polarization Diversity Softwarementioning

confidence: 99%

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Design of a Polarization Diversity System for Ground Stations of CubeSat Space Systems

Vazquez-Alvarez

Tubío-Pardavila

Gonzalez-Muino

et al. 2012

Antennas Wirel. Propag. Lett.

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In this letter, a new polarization diversity system for ground stations that operate CubeSat spacecraft is presented. This new system aims to minimize communications link losses caused by unpredictable variations of the radiation pattern of the antenna in spacecraft that spin freely. It is based on the combination of multiple signals orthogonally polarized. The ground station that controls the XaTcobeo spacecraft has implemented this system. The spacecraft has been launched recently and is still in Launch and Early Orbit Phase (LEOP).

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Section: Introductionsupporting

confidence: 57%

Section: B Polarization Diversity Softwarementioning

confidence: 99%

Design of a Polarization Diversity System for Ground Stations of CubeSat Space Systems

Vazquez-Alvarez

Tubío-Pardavila

Gonzalez-Muino

et al. 2012

Antennas Wirel. Propag. Lett.

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“…While it is possible to store energy in the microwheels (see [68], [69]), we assume they are used strictly for attitude control and that energy for control of the microwheels is only delivered from the battery system [67]. We also assume that the solar energy harvesting is sufficient during each orbital period to replenish the energy expended during eclipse.…”

Section: A Physical Characteristics and Setupmentioning

confidence: 99%

Coupled Cyber–Physical System Modeling and Coregulation of a CubeSat

Bradley

Atkins

2015

IEEE Trans. Robot.

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We propose the application of state-space techniques to develop a novel coupled cyber-physical system (CPS) model and use feedback control to dynamically adjust CPS resource use and performance. We investigate the use of a gain scheduled discrete linear quadratic regulator controller and a forward-propagation Riccati-based controller to handle the discrete-time-varying system. We demonstrate the value of our approach by conducting a disturbance-rejection case study for a small satellite (CubeSat) application in which resources required for attitude control are adjusted in real-time to maximize availability for other computational tasks. We evaluate CPS performance through a set of metrics quantifying physical system error and control effort as well as cyber resource utilization and compare these with traditional fixedrate optimal control strategies. Results indicate that our proposed coupled CPS model and controller can provide physical system performance similar to fixed-rate optimal control strategies but with less control effort and much less computational utilization.

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“…Measured solar energy values can be used to compute the absorbed solar energy as a function of the time of day [42]. Of particular interest is the two-axis analog device, which measures the solar position relative to its optical axis based on the signal obtained in a quadrant silicon detector [43]. However, although this device is attractive since it provides highly precise solar orientation measurements, its structure is rather complicated.…”

Section: Introductionmentioning

confidence: 99%

Solar Orientation Measurement Systems with Integrated Solar Cells

Chiang¹,

Lee²,

Hwang³

et al. 2008

TOBCTJ

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This paper presents a novel solar orientation measurement system based on solar cells. A methodology for calculating the solar orientation is developed in which the time and latitude angles of the sun are determined from the measured output voltages of inclined solar cells. Three types of measurement system are considered, namely a single cell type, a double cell type, and a quadrantal cell type. The relationship between the measured output voltages of the solar cells and the solar position is fully explored and documented for each measurement system. In the quadrantal measurement system, a variation in the time angle or latitude angle of the sun generates a corresponding change in the comparative output voltages of the East-West (E-W) or South-North (S-N) solar cells, respectively. By inclining the solar cells at an angle of 45 degrees, it is found that the comparative voltage ratio is sufficiently large that the time and latitude angles can be accurately predicted. The proposed measurement system provides a valuable contribution to the on-going development of tracking systems in the solar energy technology field.

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Sun oriented and powered, 3 axis and spin stabilized CubeSats

Cited by 13 publications

References 1 publication

Design of a Polarization Diversity System for Ground Stations of CubeSat Space Systems

Design of a Polarization Diversity System for Ground Stations of CubeSat Space Systems

Coupled Cyber–Physical System Modeling and Coregulation of a CubeSat

Solar Orientation Measurement Systems with Integrated Solar Cells

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