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Near-Earth asteroids are a great threat to the Earth, especially potential rendezvous and collision asteroids. To protect the Earth from an asteroid collision, it is necessary to investigate the asteroid defence problem. An asteroid terminal defence method based on multisatellite interception was designed in this study. For an asteroid intruding in...
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... Since many factors on the battlefield are difficult to describe precisely and quantitatively, such as the overall situation, mission urgency, and mission danger, we design fuzzy variable descriptions based on fuzzy theory [34] so that the tasks can be evaluated reasonably. In a fuzzy system, the membership function can be expressed as follows: ...
A task allocation problem for the heterogeneous unmanned aerial vehicle (UAV) swarm in unknown environments is studied in this paper. Considering that the actual mission environment information may be unknown, the UAV swarm needs to detect the environment first and then attack the detected targets. The heterogeneity of UAVs, multiple types of tasks, and the dynamic nature of task environment lead to uneven load and time sequence problems. This paper proposes an improved contract net protocol (CNP) based task allocation scheme, which effectively balances the load of UAVs and improves the task efficiency. Firstly, two types of task models are established, including regional reconnaissance tasks and target attack tasks. Secondly, for regional reconnaissance tasks, an improved CNP algorithm using the uncertain contract is developed. Through uncertain contracts, the area size of the regional reconnaissance task is determined adaptively after this task assignment, which can improve reconnaissance efficiency and resource utilization. Thirdly, for target attack tasks, an improved CNP algorithm using the fuzzy integrated evaluation and the double-layer negotiation is presented to enhance collaborative attack efficiency through adjusting the assignment sequence adaptively and multi-layer allocation. Finally, the effectiveness and advantages of the improved method are verified through comparison simulations.
... Liu et al. [31] investigated the orbital intercept game involving several attackers and one target with a defender. In our prior work [32,33], multi-satellite low Earth orbital game and asteroid terminal defense strategies were studied, where the CNP [10,34] and Lambert orbital transfer algorithms are respectively adopted for multi-satellite task allocation and orbit planning. Existing multiplayer orbital PE game studies have only considered a small number of satellites, making the research works about one-to-one PE game easily extendable to a threeor four-player game. ...
... The DLCNP algorithm is proposed to solve the swarm target allocation problem described above. This algorithm is a hybrid procedure based on the CNP [32,33], double-layer negotiation, and priority assessment. The flow of the DLCNP algorithm is designed as shown in Fig.4. ...
... Compared to existing methods [24,28,32,33], the proposed hybrid method transforms the action from a three-dimensional impulse velocity increment Δv i to a dimensionless time t p , which can greatly reduce the search space for learning and the training cost. Combined with the LPS, the pursuer's maneuver strategy under the orbital dynamics performance of the pursuer satellites can be obtained efficiently. ...
... The existing related work includes distributed architectures [12,13], edge computing models [14,15], agent models [16], and other optimization algorithms. Aiming at the problems of inflexible routing strategy, poor compatibility, and high deployment cost of satellite networks, [17][18][19][20][21][22][23][24][25][26] regard the satellite as an intelligent body and build a multisatellite collaborative computing framework around the agent body. Those methods have significantly superior performance in terms of computation time and success rate, but each satellite has the same role, increasing each satellite's load. ...
... The existing related work includes distributed architectures [12,13], edge computing models [14,15], agent models [16], and other optimization algorithms. Aiming at the problems of inflexible routing strategy, poor compatibility, and high deployment cost of satellite networks, [17][18][19][20][21][22][23][24][25][26] regard the satellite as an intelligent body and build a multi-satellite collaborative computing framework around the agent body. Those methods have significantly superior performance in terms of computation time and success rate, but each satellite has the same role, increasing each satellite's load. ...
With satellite systems rapidly developing in multiple satellites, multiple tasks, and high-speed response speed requirements, existing computing techniques face the following challenges: insufficient computing power, limited computing resources, and weaker coordination ability. Meanwhile, most methods have more significant response speed and resource utilization limitations. To solve the above problem, we propose a distributed collaborative computing framework with a genetic algorithm-based task scheduling model (DCCF-GA), which can realize the collaborative computing between multiple satellites through genetic algorithm. Specifically, it contains two aspects of work. First, a distributed architecture of satellites is constructed where the main satellite is responsible for distribution and scheduling, and the computing satellite is accountable for completing the task. Then, we presented a genetic algorithm-based task scheduling model that enables multiple satellites to collaborate for completing the tasks. Experiments show that the proposed algorithm has apparent advantages in completion time and outperforms other algorithms in resource efficiency.
... With the development of aerospace technology and increasing interest in planetary protection, more and more asteroid exploration missions are being proposed and conducted. The exploration missions in the past can be roughly divided into circling exploration, short-range leap exploration, and landing exploration [3]. Landing exploration is a must to achieve comprehensive research about asteroids [4]. ...
... ( ) , m n Y represents the spherical harmonic basis function, and its formula is: (3) where ( ) m n P is the Legendre polynomial; see Formula (4) for details: ...
Stable landing on asteroids is of considerable scientific and economic value but accompanied by huge difficulties. This paper proposes a novel flexible lander suitable for asteroids with microgravity and rugged surface. The gravity model with the artificial neural network and the surface model with the spherical harmonic method are introduced to establish the target asteroid’s dynamical environment. The flexible dynamics with the discrete shell model, the collision with the spring-damping model and viscous sliding friction, and the rigid coupling with the constraint violation stabilization method are elaborated for the lander. Combining the asteroid’s model with the lander’s dynamics, one successful landing scenario of the lander is presented. The lander’s landing stability of the final uncontrolled touching phase is studied through massive simulations. It is found that reasonable touching conditions can largely enhance the landing stability, and the lander can achieve a stable landing on the asteroid under a particular touching condition without control. The flexible lander’s comparison to the rigid lander is also discussed. It is concluded that the flexible lander does have higher adaptability and lower risk in asteroid landing. What is more, the attitude controller and position controller for the lander’s descent phase are also proposed and tested.
... Multiple satellites working in concert can implement space tasks that cannot be accomplished by a single robust satellite, such as remote sensing, constellations, and formation [1][2][3]. The satellites are generally launched and released in a single rocket, which can greatly shorten the time of constellation networking and improve the launch efficiency. The compression and separation devices for multi-satellite launch deployment scenarios are mainly divided into three categories: box-storage type [4][5][6], wall-mounted type [7], and stacked compression type [8,9]. ...
The launch method of one arrow with multiple satellites can greatly shorten the time for constellation networking and improve the deployment efficiency. A new compression and separation device with a four-bar perimeter arrangement is proposed for multi-satellite compaction and in-orbit release. A compression device with gap elimination is designed to implement the reliable compaction of stacked flat satellites. An electromagnetic separation device is proposed to achieve the fast, low-interference release of multi-satellites. The dynamic model with flexible guide bars is established. The separation characteristics of multiple satellites are analyzed by the kinematic simulation. The prototype is developed, and the related experiment is implemented. The results show that the four-guide-bar-edge arrangement scheme with a gap elimination device achieves reliable locking and fast separation under a vibration environment. The dynamic separation characteristics of satellites are investigated by the air floatation experiments. The results show that a stable separation speed and low disturbance angular velocity are achieved under 10% spring error.
The potential dangers of asteroids hitting the Earth are one of the challenges for mankind to preserve the human species. Various missions have been proposed to defend asteroids. Changing the Albedo magnitude by painting asteroids is a suitable and low-cost idea for the asteroid defense plan. Moving away from the Earth requires fuel consumption and the limitations of carrying the necessary materials for painting. Due to these limitations, we are not able to paint the entire asteroid, or for other reasons, we have to paint parts of the asteroid. Therefore, we should find a relative compromise between the variables to get most efficiency from painting parts of the asteroid. In this paper, we present a network structure of Data Envelopment Analysis (DEA) and consider the relationships of all variables including physical and orbital characteristics, spacecraft limitations, effective solar mass, albedo change rate, and elapsed time of the mission. We look for parts of the asteroid’s surface where we can get the most displacement by spending the least amount of raw material. One of the advantages of the proposed method is the capability of sensitivity analysis to any of the variables affecting the magnitude of the final displacement. The theorems related to the stability were proven analytically, and we show how to reduce the elapsed time by maintaining efficiency in asteroid painting. The performance of the proposed model was analyzed using real and hypothetical data from asteroid Apophis 99942.
