Thermal Design and Analysis of Unfurlable CFRP Skin-Based Parabolic Reflector for Spaceborne SAR Antenna

Park, Tae‐Yong; Kim, Seyoung; Yi, Dong-Woo; Jung, Hwa-Young; Lee, Jae-Eun; Yun, Jihyeon; Oh, Hyun-Ung

doi:10.1007/s42405-020-00301-7

Cited by 17 publications

(11 citation statements)

References 18 publications

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“…This result also implies that the flat plate-type integrated structure without any deployable appendages can provide high stiffened configuration compared with the conventional satellite structure, which has deployable appendages, such as solar panels and antennas. An important technical issue associated with the image quality of the SAR antenna is the thermal distortion of the antenna induced by temperature gradients in extreme space thermal environments [35]. This distortion causes an error in the surface contour of the SAR antenna, which degrades the radio frequency (RF) performance and antenna pointing accuracy.…”

Section: Structural Analysis Resultsmentioning

confidence: 99%

“…In order to evaluate the pointing error of the SAR antenna under an extreme on-orbit thermal environment, system-level distortion analysis was performed using the worst thermal gradient condition, which can result from the worst-condition onorbit thermal analysis of the S-STEP system. The mechanical pointing error requirements of the SAR antenna, such as the antenna surface deformation RMS and antenna best-fit An important technical issue associated with the image quality of the SAR antenna is the thermal distortion of the antenna induced by temperature gradients in extreme space thermal environments [35]. This distortion causes an error in the surface contour of the SAR antenna, which degrades the radio frequency (RF) performance and antenna pointing accuracy.…”

Section: Structural Analysis Resultsmentioning

confidence: 99%

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Innovative Mechanical Design Strategy for Actualizing 80 kg-Class X-Band Active SAR Small Satellite of S-STEP

et al. 2021

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The Small SAR Technology Experimental Project (S-STEP) mission aims to develop a new (space-based 80 kg-class active X-band synthetic aperture radar (SAR)) satellite with a main imaging mode of 1 m resolution stripmap. In the S-STEP mission, to achieve the design goal of developing faster, cheaper, better, and lighter small SAR satellite systems, innovative thermo-mechanical design approaches have been proposed and investigated. The major design approaches are the bus-payload integrated flat plate-type structure, multifunctional transmit/receive (TR) module, and dedicated vibration-free orbit deployer (VFOD) with the function of whole spacecraft vibration isolation. To validate the feasibility of the innovative mechanical design of S-STEP, a structural analysis considering launch and on-orbit environments is performed. In addition, development test results are presented to confirm the effectiveness of the proposed design approach for VFOD.

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Section: Structural Analysis Resultsmentioning

confidence: 99%

Section: Structural Analysis Resultsmentioning

confidence: 99%

Innovative Mechanical Design Strategy for Actualizing 80 kg-Class X-Band Active SAR Small Satellite of S-STEP

et al. 2021

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“…First of all, according to the position characteristics of the dot matrix code notation mark image symbol de ned in the improved coding method, after looking for a pair of dot codes with the shortest distance in the horizontal or vertical direction, this article starts from the rst code point in the vertical direction along. In the second vector search, other vectors are put into the stack with angles of 90 degrees, 135 degrees, 0 degrees, −135 degrees, −90 degrees, and −45 degrees [21]. e program proceeds in sequence according to the above-mentioned detection of the improved code, until the detected grid raster reference point has been detected and recorded and determined, then the stack item vector element in the next stack is used to continue the detection until all the vectors in the stack.…”

Section: Construction Of Grid Raster Line Of Dot Matrix Codementioning

confidence: 99%

Collaborative Music Creation Method Based on Image Collection of Lattice Code

Xiang

2022

International Transactions on Electrical Energy Systems

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With the development of science and technology, more and more emerging technologies have been integrated into electronic music, forming a rich and diverse form of interactive electronic music. This research mainly discusses the collaborative music creation method based on bit matrix code image acquisition. In the decoding process, the displacement value of each point should be determined according to the direction and distance from the point to the reference point of the corresponding grid raster. This article marks the position characteristics of image symbols according to the dot matrix code notation defined in the improved coding method. After searching for a pair of dot codes with the shortest distance in the horizontal or vertical direction, starting from the first code point in the vertical direction and following the second code point. Through the above method, it is possible to accurately construct the grid raster lines of the dot matrix position encoding symbol image formed after the improved encoding, so that the decoding of the dot matrix symbol image is more accurate, and the composition translation is reduced. The improved coding method reduces the error of the origin matrix code by about 0.11 mm as a whole. This research will realize the collaborative recording of data in the music creation process, which will bring great convenience to creators.

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“…Synthetic aperture radar (SAR), which can provide high-resolution earth images regardless of weather conditions or time of day has recently been used in various fields of domestic and international observation satellites [1,2]. In the case of SAR antennas, to maximize resolution and power gain in acquiring high-resolution images, a large deployable panel is accommodated.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of SAR antennas, to maximize resolution and power gain in acquiring high-resolution images, a large deployable panel is accommodated. However, to deploy such a large space deployment structure in orbit, it is essential to use specific mechanisms that allow the structure to be appropriately folded and stored inside the launch-vehicle fairing and fully deployed in orbit [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Validation of a Passive Truss-Link Mechanism for Deployable Structures Considering Friction Compensation with Response Surface Methods

et al. 2022

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In this study, a passive truss-link mechanism applicable to large-scale deployable structures was designed to achieve successful deployment in space. First, we simplified the selected truss-link mechanisms to the two-dimensional geometry and calculated the degrees of freedom (DOF) to determine whether a kinematic over-constraint occurs. The dimensions of the truss-link structure were determined through a deployment kinematic analysis. Second, a deployment simulation with the truss-link was conducted using multibody dynamics (MBD) software. Finally, a deployment test was performed considering gravity compensation, and the results were compared with those of MBD simulation. The results of the deployment simulations were confirmed to be slightly faster than those of the deployment test due to friction effects existing in the joints and gravity compensation devices. To address this issue, inverse identification of the equivalent frictional torque (EFT) at the revolute joints in the deployment test was conducted through response surface methods (RSM) combined with the central composite design technique. As a result, we confirmed that the deployment angle history of the deployment simulation was similar to that of the deployment test.

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Thermal Design and Analysis of Unfurlable CFRP Skin-Based Parabolic Reflector for Spaceborne SAR Antenna

Cited by 17 publications

References 18 publications

Innovative Mechanical Design Strategy for Actualizing 80 kg-Class X-Band Active SAR Small Satellite of S-STEP

Innovative Mechanical Design Strategy for Actualizing 80 kg-Class X-Band Active SAR Small Satellite of S-STEP

Collaborative Music Creation Method Based on Image Collection of Lattice Code

Modeling and Validation of a Passive Truss-Link Mechanism for Deployable Structures Considering Friction Compensation with Response Surface Methods

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