Nano-satellite swarm for SAR applications: design and robust scheduling

Pang, Chee Khiang; Kumar, Akash; Goh, Cher Hiang; Cao, Le

doi:10.1109/taes.2014.140077

Cited by 32 publications

(11 citation statements)

References 26 publications

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“…In addition, the long flight duration and the beam steering technique could enhance their coverage ability further. However, the expenses of these SAR systems are quite huge, the alternative of which can be the lightweight UAV SAR [8,32,33]. Comparatively, the shortcomings of the lightweight UAV SAR systems are the narrow swath, short flight duration, and fixed beam orientation.…”

Section: Related Workmentioning

confidence: 99%

Sensor-Oriented Path Planning for Multiregion Surveillance with a Single Lightweight UAV SAR

Chen

Wang

et al. 2018

Sensors

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In the surveillance of interested regions by unmanned aerial vehicle (UAV), system performance relies greatly on the motion control strategy of the UAV and the operation characteristics of the onboard sensors. This paper investigates the 2D path planning problem for the lightweight UAV synthetic aperture radar (SAR) system in an environment of multiple regions of interest (ROIs), the sizes of which are comparable to the radar swath width. Taking into account the special requirements of the SAR system on the motion of the platform, we model path planning for UAV SAR as a constrained multiobjective optimization problem (MOP). Based on the fact that the UAV route can be designed in the map image, an image-based path planner is proposed in this paper. First, the neighboring ROIs are merged by the morphological operation. Then, the parts of routes for data collection of the ROIs can be located according to the geometric features of the ROIs and the observation geometry of UAV SAR. Lastly, the route segments for ROIs surveillance are connected by a path planning algorithm named the sampling-based sparse A* search (SSAS) algorithm. Simulation experiments in real scenarios demonstrate that the proposed sensor-oriented path planner can improve the reconnaissance performance of lightweight UAV SAR greatly compared with the conventional zigzag path planner.

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Section: Related Workmentioning

confidence: 99%

Sensor-Oriented Path Planning for Multiregion Surveillance with a Single Lightweight UAV SAR

Chen

Wang

et al. 2018

Sensors

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“…For example, [23] addresses the problem of tolerating N failures in nano-satellite swarm-based systems, using spare swarms. This work presents general ideas that are not particularly focused on a specific device, but they can be applied to reconfigurable computers.…”

Section: Related Workmentioning

confidence: 99%

Reliability Improvement of Hardware Task Graphs via Configuration Early Fetch

Ramezani

Sedaghat

Clemente

2017

IEEE Trans. VLSI Syst.

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Abstract-This study presents a technique to improve the reliability and the Mean Time to Failure (MTTF) of hardware task graphs running on reconfigurable computers. This technique, which has been named Task Early-fetch, can be applied to a sequence of one or several applications, represented as task graphs. It consists in carrying out the reconfiguration of some tasks within the execution of the previous task graph, plus increasing the redundancy level of the early-fetched tasks. Experimental results on actual task graphs show the positive impacts of the proposed technique. Thus, without deteriorating the execution time (makespan), on average, a 114% MTTF improvement is achieved for no-fault-tolerant task graphs, and the improvement is more significant when applying to faulttolerant task graphs. Finally, this paper presents a hardware implementation of a manager that applies these techniques at run-time and steers the execution of the running task graphs. It demonstrates that, with 0.03% consumption of FFs and LUTs and also 1.22% occupancy of BRAMs available on a Xilinx Virtex UltraScale XCVU095-2FFVA2104E FPGA, the required run-time computations can be carried out in negligible delays.

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“…Nanosatellites have gained great attention of the space community since last decade and have a key role in current and future space industry with potentially great impact [1]. The nanosatellites, being affordable, can be used in core application fields including remote sensing, earth observation, radiometry, interferometry to name a few [2], [3], [4]. The small size, mass, cost and low power features make them an obvious choice for universities and small and medium enterprises (SMEs).…”

Section: Introductionmentioning

confidence: 99%

Optimized Design and Thermal Analysis of Printed Magnetorquer for Attitude Control of Reconfigurable Nanosatellites

Mughal

Ali

et al. 2020

IEEE Trans. Aerosp. Electron. Syst.

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Attitude Control System (ACS) is one of the critical subsystems of any spacecraft andtypically is in charge of de-tumbling, controlling and orienting the satellite after initial deployment and during the satellite operations. The magnetorquer is a core magnetic attitude control actuator and, therefore, a good choice for nanosatellite attitude stabilization. There are various methods to achieve control torque using the magnetorquer. An innovative design of printed magnetorquer has been proposed for the nanosatellites which is modular, scalable, cost effective, less prone to failure, with reduced harness and power consumption since the traces are printed either on top layer or inner layers of the printed circuit board. The analysis in terms of generated torque with a range of input applied voltages, trace widths, outer and inner-most trace lengths is presented to achieve the optimized design.The optimum operating voltage is selected to generate the desired torque while optimizing the torque to the power ratio. The results of analysis in terms of selection of optimized parameters including torque to power ratio, generated magnetic dipole moment and power consumption have been validated practically on a cubesat panel. The printed magnetorquer configuration is modular which is useful to achieve mission level stabilization requirements. For spin stabilized satellites, the rotation time analysis has been performed using the printed magnetorquer.

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Nano-satellite swarm for SAR applications: design and robust scheduling

Cited by 32 publications

References 26 publications

Sensor-Oriented Path Planning for Multiregion Surveillance with a Single Lightweight UAV SAR

Sensor-Oriented Path Planning for Multiregion Surveillance with a Single Lightweight UAV SAR

Reliability Improvement of Hardware Task Graphs via Configuration Early Fetch

Optimized Design and Thermal Analysis of Printed Magnetorquer for Attitude Control of Reconfigurable Nanosatellites

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