NISAR L-Band and S-Band Instrument Antennas: Compatibility Test and Results

Focardi, Paolo; Vacchione, Joseph D.; Harrell, Jefferson A.

doi:10.1049/cp.2018.0738

Cited by 1 publication

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“…Hence, it is of great significance to carry out a series of studies on the main line of innovative design in space deployable antenna mechanisms as it will improve the international space science research level (Nie et al, 2017;Chen et al, 2017;Xing and Zheng, 2014). The truss mechanism has been widely used in satellite antennae due to its high overall stiffness, easy control of shape, and surface accuracy (Okhotkin et al, 2017), for example, the ring truss deployable antenna mechanism (RTDAM) on the US NISAR satellite (Kobayashi et al, 2019;Focardi and Harrell, 2019;Focardi and Vacchione, 2019) and the AstroMesh RTDAM of NGST (Meguro et al, 2000). In addition, there are circular scissor deployable antennas from Russian companies (Cherniavsky et al, 2005;Medzmariashvili et al, 2009) and frame deployable antennas on Japanese satellite ETS-VIII (Meguro et al, 2009).…”

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confidence: 99%

Kinematic and dynamic characteristics' analysis of a scissor multi-rod ring deployable mechanism

et al. 2023

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Abstract. In this paper, the authors developed a double-layer ring truss deployable antenna mechanism (RTDAM) based on a scissor unit, which can be used as the deployment and support mechanism in large-aperture satellite antenna. Firstly, three configuration state diagrams of the scissor multi-rod RTDAM were displayed: folded, half-deployed, and deployed. The mechanism was decomposed into a closed-ring deployable mechanism unit and several non-closed-ring deployable mechanism units. The screw constraint topological diagram of the closed-ring deployable mechanism unit was drawn, and the number of degrees of freedom (DOFs) was calculated via the screw theory method. Then, the expressions for screw velocity and screw acceleration of each component in the resultant mechanism were analyzed, calculated, and solved. The screw velocity and screw acceleration of each component were obtained, and the six-dimensional velocity and acceleration of each component were obtained through screw conversion and recursion. Finally, using the Newton–Euler equation and virtual work principle, the dynamic equation of the RTDAM with an integral scissor multi-rod ring truss mechanism was established, and the theoretical analysis was validated through numerical calculation and simulation results. The RTDAM of the scissor multi-rod ring truss proposed in this paper has a single DOF and can be well applied to the large-aperture satellite antenna.

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