Design of an end-to-end demonstration mission of a Formation-Flying Synthetic Aperture Radar (FF-SAR) based on microsatellites

Grasso, Mario; Renga, Alfredo; Fasano, Giancarmine; Graziano, Maria Daniela; Grassi, Michele; Moccia, Antonio

doi:10.1016/j.asr.2020.05.051

Cited by 24 publications

(6 citation statements)

References 25 publications

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“…As in Equation ( 12), the change in the relative orbital elements induced by the variation of the velocity is decoupled as in-plane and out-of-plane maneuvers in the RTN frame. Inplane relative orbit control parameters are calculated by the inversion of the four equations at the top within Equation (12). Particularly, when the constraints of minimizing the thrust cost and maneuvering with two impulses are applied, the in-plane relative orbit control parameters δv T 1 , δv T 2 , δv R 1 , δv R 2 , u M 1 , and u M 2 are obtained as shown in Equation ( 13) [21].…”

Section: Calculations Of Control Parameters ∆Vmentioning

confidence: 99%

“…Consequently, SAR satellites are used in various missions for earth observation, such as environmental investigation, ground mapping, disaster or traffic monitoring, and military reconnaissance [8][9][10]. In the 2010s, owing to material technology advances and commercial off-the-shelf (COTS) developments, relatively inexpensive microclass SAR satellites were manufactured [11][12][13]. Accordingly, commercial companies such as ICEYE, Capella space, and Synspective have developed SAR microsatellites, and they are providing high resolution (1~5 m) SAR images commercially [8,11,14].…”

Section: Introductionmentioning

confidence: 99%

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Mission Design and Orbit-Attitude Control Algorithms Development of Multistatic SAR Satellites for Very-High-Resolution Stripmap Imaging

et al. 2022

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This study designs a multistatic synthetic aperture radar (SAR) formation-flying system for very-high-resolution stripmap imaging (VHRSI) using manufacturable SAR microsatellites. Multistatic SAR formation specifications for VHRSI are derived based on the SAR image theory. For the simultaneous multi-satellite operation, the advantages of the autonomous orbit and attitude control are prominent in terms of the workload of the ground station or the efficient performance of missions. Therefore, the autonomous relative-orbit-control algorithm using relative orbital elements is developed to maintain the designed multistatic SAR formation. Additionally, an autonomous attitude-control algorithm for multistatic SAR imaging is designed by applying the optimal right-ascension of the descending node (RADN) sector concept. Finally, the resolution improvement of VHRSI is verified through multistatic SAR imaging simulations. The multistatic SAR formation is designed with three satellites separated by 7.5 km each in the along-track direction. Autonomous relative orbit control maintains the relative position error within 45 m (3σ). Additionally, the autonomous attitude control simulation verifies that the satellites perform attitude maneuvers suitable for the operation mode, and the pointing error is maintained within 0.0035° (3σ). The spatial resolution of the multistatic SAR system for VHRSI is 0.95 × 0.96 m, which satisfies the very-high-spatial-resolution requirement.

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Section: Calculations Of Control Parameters ∆Vmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mission Design and Orbit-Attitude Control Algorithms Development of Multistatic SAR Satellites for Very-High-Resolution Stripmap Imaging

et al. 2022

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“…Compared with expensive and complex individual spacecraft, the multispacecraft system shows the advantages of low cost, high scalability, and high reliability [1] . The attitude coordinated control, which served as an important guarantee for the multi-spacecraft system, has been widely applied, such as in gravity measurement and synthetic aperture radar [2] , thus gaining increasing interest and extensive study in recent years.…”

Section: Introductionmentioning

confidence: 99%

Attitude consensus coordination algorithm for spacecraft formation under compound disturbance

Zhang,

Chen,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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To address the attitude coordination and consensus tracking problem in the multi-spacecraft system, a distributed attitude-coordinated strategy based on the Fixed-time theory is proposed. An observer based on second-order integral sliding mode is designed to accurately estimate the compound disturbance, which consists of external disturbance and inertia uncertainties. On the basis of the observed information, a distributed Fixed-time attitude coordination controller is proposed, which can guarantee the attitude tracking errors converge to zero in a fixed time. System stability is analyzed by using the Lyapunov function. Finally, simulations and comparison analysis demonstrate the effectiveness and superiority of the proposed control scheme.

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“…DSSs are comprised of a large number of spacecraft that cooperate with one another to accomplish a specific mission objective [ 4 ]. In some circumstances, DSSs combine to generate a sensory system that would be impossible to create on a monolithic platform [ 5 , 6 ]. In other configurations, they use distributed measurements to extract data on the spatial and temporal consequences of phenomena that are far larger than what a single spacecraft can observe due to limited swath width and duty cycle [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Trusted Autonomous Operations of Distributed Satellite Systems Using Optical Sensors

Thangavel

Spiller

Sabatini

et al. 2023

Sensors

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Recent developments in Distributed Satellite Systems (DSS) have undoubtedly increased mission value due to the ability to reconfigure the spacecraft cluster/formation and incrementally add new or update older satellites in the formation. These features provide inherent benefits, such as increased mission effectiveness, multi-mission capabilities, design flexibility, and so on. Trusted Autonomous Satellite Operation (TASO) are possible owing to the predictive and reactive integrity features offered by Artificial Intelligence (AI), including both on-board satellites and in the ground control segments. To effectively monitor and manage time-critical events such as disaster relief missions, the DSS must be able to reconfigure autonomously. To achieve TASO, the DSS should have reconfiguration capability within the architecture and spacecraft should communicate with each other through an Inter-Satellite Link (ISL). Recent advances in AI, sensing, and computing technologies have resulted in the development of new promising concepts for the safe and efficient operation of the DSS. The combination of these technologies enables trusted autonomy in intelligent DSS (iDSS) operations, allowing for a more responsive and resilient approach to Space Mission Management (SMM) in terms of data collection and processing, especially when using state-of-the-art optical sensors. This research looks into the potential applications of iDSS by proposing a constellation of satellites in Low Earth Orbit (LEO) for near-real-time wildfire management. For spacecraft to continuously monitor Areas of Interest (AOI) in a dynamically changing environment, satellite missions must have extensive coverage, revisit intervals, and reconfiguration capability that iDSS can offer. Our recent work demonstrated the feasibility of AI-based data processing using state-of-the-art on-board astrionics hardware accelerators. Based on these initial results, AI-based software has been successively developed for wildfire detection on-board iDSS satellites. To demonstrate the applicability of the proposed iDSS architecture, simulation case studies are performed considering different geographic locations.

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Design of an end-to-end demonstration mission of a Formation-Flying Synthetic Aperture Radar (FF-SAR) based on microsatellites

Cited by 24 publications

References 25 publications

Mission Design and Orbit-Attitude Control Algorithms Development of Multistatic SAR Satellites for Very-High-Resolution Stripmap Imaging

Mission Design and Orbit-Attitude Control Algorithms Development of Multistatic SAR Satellites for Very-High-Resolution Stripmap Imaging

Attitude consensus coordination algorithm for spacecraft formation under compound disturbance

Trusted Autonomous Operations of Distributed Satellite Systems Using Optical Sensors

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