Small Satellites for Earth Observation

Sandau, Rainer; Röser, Hans‐Peter; Valenzuela, A.

doi:10.1007/978-1-4020-6943-7

Cited by 32 publications

(4 citation statements)

References 12 publications

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“…На дальнейшее активное применение и увеличение доли малых КА указывает и развитие так называемых «кластерных» космических систем связи, дистанци-онного зондирования космического пространства и Земли, на базе мини-, микро-и наноспутников [9][10][11]. Такие космические системы имеют повышенный охват…”

Section: анализ литературных данных и постановка проблемыunclassified

Investigation of the process of the stabilization of the rigid body carrier of the rotational axis of the pendulum autobalancer

Pirogov¹

2016

EEJET

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Section: анализ литературных данных и постановка проблемыunclassified

Investigation of the process of the stabilization of the rigid body carrier of the rotational axis of the pendulum autobalancer

Pirogov¹

2016

EEJET

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“…Based on the recent advent of small satellites [26] and the exploitation of machine learning for remote sensing tasks [27][28][29][30], some authors have already explored the opportunities provided by on-board processing of remote sensing images [31][32][33][34][35]. However, all these applications would quite benefit from on-board autonomous planning capabilities, so that the satellites can entirely focus on observing and monitoring hazards and disasters on the planet.…”

Section: Introductionmentioning

confidence: 99%

Analytical Attitude Guidance Planner for Multiple Ground Targets Acquisitions

2022

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This paper focuses on the development of a guidance methodology for the planning of multiple ground target acquisition. Specifically, the work addresses the problem of the lack of an attitude guidance planner (AGP) aboard a remote sensing satellite. In general, the guidance is computed offline and uploaded by ground control to the space segment, i.e., satellites are not responsible for the guidance generation but they only perform control algorithms to track the guidance profiles provided by the ground segment. Overall, this limits the mission flexibility and efficiency, affecting the capability of autonomous satellite decisions. This choice is driven by the fact that the numerical algorithms used to optimize the attitude guidance trajectory require high computational effort to be implemented directly on the satellite computer. Therefore, the aim of this work is to design an analytical AGP solution to solve this problem by requiring low computational effort, making it suitable for real-time applications on on-board flight hardware. In this way, the satellite’s guidance, navigation, and control (GNC) module would become completely autonomous and independent of ground control, which will only have to indicate the targets to be acquired so that the satellite can generate its own guidance for the GNC module. The AGP analytical solution for multiple ground target acquisition is evaluated by means of phases: the first phase is named the APPG (attitude point-to-point generator) and it aims to generate the point-to-point guidance to start the ground target acquisition. The second phase is named the ATPG (attitude target pointing generator) and it generates the reference guidance to maintain the payload view axis pointing toward the ground target. The two phases joined together give the whole guidance needed to observe ground target points by means of an analytical closed-form solution.

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“…The further development and increase in the share of small spacecrafts also indicated by the development of so-called "cluster" space communication systems, remote sensing of outer space and the Earth, based on mini-, micro-and nanosatellites [4,5]. Such space systems have an increased coverage of space, high efficiency and reliability of the system as a whole due to the formation and maintenance of the orbital grouping.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Stability of the Steady Motions of a Rotational Mechanical System

Pirogov

2017

Technology transfer: fundamental principles and innovative tech

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The conditional stability of steady motions of a mechanical isolated system consisting of a rotating carrier body, a material point creating its static imbalance, and a passive automatic balancer consisting of two identical mathematical pendulums are investigated. The pendulums are mounted on the longitudinal axis of the supporting body and move in the plane of static imbalance. The relative motion of the pendulums is impeded by viscous drag forces. It is established that in the case when the imbalance is and the pendulums can eliminate it with a certain margin, there is one basic movement; in the absence of imbalance, there is a one–parameter family of basic movements; in the case of maximum unbalance, which pendulums can eliminate, there is one basic movement, but it generates a pseudo–family of basic motions. It is also established that conditionally asymptotically stable are separate basic motions, if they are isolated, or a family, or pseudo–families of basic motions. For pendulum, ball and liquid automatic balancers, an approximate law is obtained for the variation of large nutation angles in the case of an axisymmetric and non–axisymmetric supporting body. It is established that the rate of change of the nutation angle is significantly affected by the ratio between the axial moments of inertia of the rotating carrier and the coefficient of viscous drag. An empirical formula is proposed for estimating the residual nutation angle, which occurs when the passive automatic balancers (nutation dampers) are incorrectly installed on the spacecraft and stabilized by rotation, and an example of its application for a particular satellite is given. It is shown that incorrect installation of the auto balance on the supporting body can lead to the formation of a residual nutation angle even in the case of a "stable" supporting body. The obtained results can be used in the design of passive automatic balancers (nutation damping) (pendulum, ball and liquid) for spacecrafts stabilized by rotation

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Small Satellites for Earth Observation

Cited by 32 publications

References 12 publications

Investigation of the process of the stabilization of the rigid body carrier of the rotational axis of the pendulum autobalancer

Investigation of the process of the stabilization of the rigid body carrier of the rotational axis of the pendulum autobalancer

Analytical Attitude Guidance Planner for Multiple Ground Targets Acquisitions

Investigation of the Stability of the Steady Motions of a Rotational Mechanical System

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