样式: 排序: IF: - GO 导出 标记为已读
-
Grouping Formation and Obstacle Avoidance Control of UAV Swarm Based on Synchronous DMPC Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-4-12 Yunfeng He, Xianjun Shi, Jianhua Lu, Chaolun Zhao, Guorong Zhao
This paper focuses on the grouping formation control problem of unmanned aerial vehicle (UAV) swarms in obstacle environments. A grouping formation and obstacle avoidance control algorithm based on synchronous distributed model predictive control (DMPC) is proposed. First, the UAV swarm is divided into several groups horizontally and into a leader layer and a follower layer vertically. Second, tracking
-
UAV Detect and Avoid from UTM-Dependent Surveillance Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-4-9 C. E. Lin, P. C. Shao, J. Y. Bai, Y. Y. Lin, H. T. Bui
A hierarchical unmanned aircraft system (UAS) traffic management (UTM) system has deployed 45 ground transceiver stations (GTS) for UAS services in Taiwan. This UTM system covers most areas for UAV-dependent surveillance using ADS-B Like technology. UTM Controller can monitor all UAV flights under transparent surveillance in low airspace. Controller-initiated UAV “detect and avoid” (DAA) mechanism
-
ACP-Based Space Systems: Design, Development, and Operation Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-27 Yingkai Cai, Qingliang Meng, Zhaokui Wang
In the context of the rapid advancements in space technology and the increasing complexity of space missions, there is a growing need for efficient and effective approaches to tackle the multifaceted challenges faced by space systems. Traditional methods often fall short in providing comprehensive support throughout the entire life cycle of space systems. To address these challenges, this paper presents
-
Multiple Leap Maneuver Trajectory Design and Tracking Method Based on Prescribed Performance Control during the Gliding Phase of Vehicles Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-26 Taotao Zhang, Jun Zhang, Sen Shen, Weiyi Chen
A novel standard trajectory design and tracking guidance used in the multiple active leap maneuver mode for hypersonic glide vehicles (HGVs) is proposed in this paper. First, the dynamic equation and multiconstraint model are first established in the flight path coordinate system. Second, the reference drag acceleration-normalized energy (D-e) profile of the multiple active leap maneuver mode is quickly
-
Fault-Tolerant Control for Carrier-Based Aircraft Automatic Landing Subject to Multiple Disturbances and Actuator Faults Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-26 Qilong Wu, Qidan Zhu
This paper introduces a fault-tolerant control scheme for the automatic carrier landing of carrier-based aircraft using direct lift control. The scheme combines radial basis function neural network and active disturbance rejection control (RBF-ADRC) to overcome the impact of actuator failures and external disturbances. First, the carrier-based aircraft model, the carrier air-wake model, and the actuator
-
An Iterative Determination Method of an Axial Deployment Force of a Lanyard-Deployed Coilable Mast in Local Coil Mode Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-26 Yu Liu, Liang Sun, Hai Huang, Xurui Zhao, Jiahao Liu, Yishi Qiao
The axial deployment force is an indispensable parameter of a lanyard-deployed coilable mast, which reflects its load capacity in practical applications. However, research on the axial deployment force in the literature is very limited, and there are no mature numerical methods to determine this parameter in the design stage of coilable masts. In this paper, a numerical method for determining the axial
-
Research on the Simulation Method for Equivalent Stiffness of Bolted Connection Thin Plate Structures Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-26 Zhe Chen, Qi-jun Zhao, Guo-chen Zhou
Bolted connections are widely used in assembly structures, and their dynamic characteristics are often affected by stiffness, damping, excitation, and other factors. In order to solve the problems of low computational efficiency of fine modeling and large computational error of linearized equivalent modeling of bolted structures, this paper proposes a dynamic characteristic parameter identification
-
Aeroengine Remaining Life Prediction Using Feature Selection and Improved SE Blocks Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-25 Hairui Wang, Shijie Xu, Guifu Zhu, Ya Li
Aeroengines use numerous sensors to detect equipment health and ensure proper operation. Currently, filtering useful sensor data and removing useless data is challenging in predicting the remaining useful life (RUL) of an aeroengine using deep learning. To reduce computational costs and improve prediction performance, we use random forest to evaluate the feature importance of sensor data. Based on
-
A Dual-Hierarchy Synchronization Method for Signal Preambles with High Detection Rates for Satellite-Based ADS-B Receivers with Different Sensitivities Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-21 Xinhui Jian, Xuejun Zhang, Jianxiang Ma, Weidong Zhang
Existing methods are unable to achieve high detection rates and low false alarm rates of satellite-based Automatic Dependent Surveillance-Broadcast (ADS-B) signal preambles at extremely low signal-to-noise ratios (SNRs) using limited on-star resources. In this paper, a dual-hierarchy synchronization method is proposed, including a first-level coarse synchronization and a second-level fine synchronization
-
Impact Analysis of Different Trajectory Shapes on Optimization Based on Original Natural Algorithm Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-20 Yijing Chen, Ying Nan, Zhihan Li
In this paper, the reentry phase of the Aerospaceplane is taken as the research object, and the performance parameters of the reusable rocket of a private company are analyzed. Aiming at the guidance and control scheme of the spacecraft returning to the reentry trajectory in the real environment, the original natural algorithm is optimized by considering various reentry flight constraints, and the
-
Multi-UAV DMPC Cooperative Guidance with Constraints of Terminal Angle and Obstacle Avoidance Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-20 Zijie Jiang, Xiuxia Yang, Cong Wang, Yi Zhang, Hao Yu
This paper studies the salvo attack problem for multiple unmanned aerial vehicles (UAVs) against a maneuvering target, and a guidance scheme based on distributed model predictive control (DMPC) is presented to achieve cooperative interception with constraints of terminal impact angle and no-fly zone (or obstacle) avoidance. Firstly, for guaranteeing the synchronization of UAVs in calculating their
-
Predicting Flight Delays with Machine Learning: A Case Study from Saudi Arabian Airlines Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-15 Meshal Alfarhood, Rakan Alotaibi, Bassam Abdulrahim, Ahmad Einieh, Mohammed Almousa, Abdulrhman Alkhanifer
Flight delays are a major concern for both travelers and airlines, with significant financial and reputational consequences. Accurately predicting flight delays is crucial for enhancing customer satisfaction and airline revenues. In this paper, we leverage the power of artificial intelligence and machine learning techniques to build a framework for accurately predicting flight delays. To achieve this
-
Numerical Study on the Self-Pulsation Characteristics of LOX/GH2 Swirl Coaxial Injector Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-15 Wentong Qiao, Chengkai Liang, Luhao Liu, Shaoyan Wang, Bingbing Zhang, Xiaocong Yang, Lijun Yang, Qingfei Fu
To investigate the self-pulsation characteristics of a liquid-centered swirl coaxial injector with liquid oxygen (LOX) and gas hydrogen (GH2) as the working mediums under supercritical condition, a numerical simulation was employed. The transient simulation of the flow and injection process of cryogenic propellant was carried out using the RNG turbulence model, VOF model, and Peng-Robinson equation
-
Online Identification of Aerodynamic Parameters of Experimental Rockets Based on Unscented Kalman Filtering Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-3-2 Xiaobin Tang, Zhenyu Jiang
Online identification of aerodynamic parameters of experimental rockets was completed based on unscented Kalman filtering (UKF). Numerical simulation, hardware-in-the-loop (HIL) simulation, and flight tests were conducted. The identification error of aerodynamic force in numerical simulation and HIL simulation is within 2%. For flight test data, trajectory reconstruction was performed using the identified
-
Machine Learning-Based Backpressure Unstart Prediction and Warning Method for Combined Cycle Engine Hypersonic Inlet-Oriented Wide Speed Range Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-29 Ke Min, Tanbao Hong, Zejun Cai, Lianchen Yu, Chengxiang Zhu, Jianping Zeng
Inlet unstart prediction and warning are strictly crucial to the operation of hypersonic engines, especially for combined cycle engines where implementation across a wide speed range poses significant challenges. This paper proposes a realization method that involves constructing the conditions of critical backpressure ratios for the inlet unstart and unstart warning states within a wide speed range
-
Active Pointing Compensation of a HTS Multibeam Antenna Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-29 Xudong Wang, Pengpeng Wang
Active pointing compensation of a High Throughput Satellite (HTS) multibeam antenna via microfiber composites (MFCs) is studied in this paper. Electrical-mechanical coupling analysis of MFCs is conducted to quantitatively determine driving forces and moments of MFCs attached on a carbon fiber reinforced composite (CFRP) laminate, and a positive correlation relationship is observed for driving ability
-
A New Theoretical Method for Solving Forward Kinematics of the Parallel Mechanisms Based on Transfer Matrix Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-26 Jin Wang, Zijian Jing, Junli Guo, Tao Qin, Han Li, Xin Li, Zhenchuang Li, Fanhui Meng, Bo Qi
The flexible parallel mechanism is widely utilized in precision instruments, thanks to its numerous advantages, such as high precision, frictionless operation, and seamless movements. The establishment of the motion equations for this mechanism is crucial for designing, analyzing, controlling, and simulating parallel mechanisms. While the existing inverse kinematics solution theory is comprehensive
-
A Dynamic Task Scheduling Algorithm for Airborne Device Clouds Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-26 Bao Deng, Zhengjun Zhai
The rapid development of mobile Internet has promoted the rapid rise of cloud computing technology. Mobile terminal devices have greatly expanded the service capacity of mobile terminals by migrating complex computing tasks to run in the cloud. However, in the process of data exchange between mobile terminals and cloud computing centers, on the one hand, it consumes the limited power of mobile terminals
-
Design, Multiperspective Investigations, and Performance Analysis of Multirotor Unmanned Aerial Vehicle for Precision Farming Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-23 Darshan Kumar Jayaram, Vijayanandh Raja, Beena Stanislaus Arputharaj, Hussein A. Z. AL-bonsrulah
Farming and agriculture are the oldest professions, but they are adapting to the technology revolution to accommodate the world’s growing population. UAV technology is part of the agriculture revolution, which aims to boost crop yields, properly monitor fields, and handle manpower shortages and resource efficiency. Rural India’s tiny farmers cannot afford UAV technology; therefore, it has not yet spread
-
Numerical Investigation on the Effect of Fuel-Rich Degree in the RBCC Engine under the Ejector Mode Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-6 Yizhi Yao, Mingbo Sun, Menglei Li, Peibo Li, An Bin, Rui Gu, Jiaoru Wang, Feng Wei, Taiyu Wang, Jikai Chen
The ejector mode of the Rocket-Based Combined-Cycle (RBCC) engine is characterized by high fuel consumption. This study is aimed at investigating the influence of the rocket fuel-rich degree on the RBCC engine’s performance under the ejector mode combined with simultaneous mixing and combustion (SMC). Numerical simulations were conducted for various rocket mixing ratios () under subsonic () and supersonic
-
VGESO-Based Finite-Time Fault-Tolerant Tracking Control for Quadrotor Unmanned Aerial Vehicle Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-2 Haidong Shen, Jiwei Du, Kun Yan, Yanbin Liu, Jinbao Chen
Based on the variable gain extended state observer, a finite-time fault-tolerant control strategy is developed for the quadrotor unmanned aerial vehicle with actuator faults and external disturbances. Firstly, a novel variable gain extended state observer is designed to estimate the unknown external disturbances, which mitigates the initial peaking phenomenon existing in traditional extended state
-
Numerical Investigation of Supercooled Large Droplets Impingement Characteristics of the Rotating Spinner Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-2-2 Wei Jia, Feng Zhang
Aircraft engine icing caused by supercooled large droplets (SLD) poses a significant threat to flight safety. In this paper, the SLD impingement characteristics of the rotating spinner were investigated using FLUENT UDS and the governing equations for water droplet motion were solved based on the Eulerian method. The droplet breakup was simulated using the number density equation, while the droplet
-
Model of Multi-Algorithmic-Based Optimization of 4D Approach Trajectory under Thunderstorm Weather Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-31 Li Lu, Xin Lai
Thunderstorms are recognized as perilous meteorological phenomena characterized by irregular and nonlinear movement, posing significant risks to approaching aircraft and necessitating technical methods to ensure safety to the aviation operations. This research specifically addresses the challenges associated with aircraft during the approach segment and introduces a multialgorithmic model focusing
-
A Real-Time Measurement Model of Attention-Allocation Level and Its Application in Simulated SPO Task Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-30 Lei Wang, Zhiyang Zhang, Wei Tan, Zhongchang Yang
Most human-caused flight accidents can be attributed to a pilot’s attention deficit and monitoring errors. Accordingly, pilots’ attention allocation is strongly related to their task performance. This study is aimed at analyzing pilots’ fixation characteristics and attention-allocation levels. First, we proposed a model for measuring attention-allocation level based on the salience, effort, expectancy
-
Reentry Capsule Reachable Tube Boundary Prediction via Evolutionary Multiobjective Optimization Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-29 Wen Zou, Zhanxin Cui, Genghui Li, Zhiwei Feng, Zhenkun Wang, Qingyu Gao, Qingbin Zhang, Tao Yang
In the field of aerospace, solving the boundary problem associated with the parachute-capsule system remains a big challenge. The conventional Monte Carlo method proves inadequate for acquiring comprehensive boundary information. To address this issue, this paper introduces a novel tube prediction scheme by leveraging the natural geometric characteristics of the reachable tube and employing a multiobjective
-
The Channel Fading Influence of the Receiver Operating Characteristics of the TT&C Receiver Based on the Dual-Sequence Frequency Hopping Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-27 Guangkai Liu, Jie Guo, Weizheng Xin, Cheng Cheng, Lu Wang
Aimed at the antijamming needs of the space tracking, telemetry command (TT&C) receiver under a low signal-to-noise ratio, the anti-interference advantage of the dual-sequence frequency hopping (DSFH) communication system is applied. The channel amplitude fading influence of the receiver operating characteristics (ROC) of the TT&C receiver based on the DSFH is studied. Firstly, based on the typical
-
VB-Based Gaussian Sum Cubature Kalman Filter for Adaptive Estimation of Unknown Delay and Loss Probability Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-25 Ruipeng Wang, Xiaogang Wang, Haojie Zhang
The traditional Kalman filter assumes that all measurements can be obtained in real time, which is invalid in practical engineering. Therefore, a variational Bayesian- (VB-) based Gaussian sum cubature Kalman filter is proposed to solve the nonlinear tracking problem of multistep random measurement delay and loss (MRMDL) with unknown probability. First, the measurement model with MRMDL is modified
-
Investigation and Validation of Mission Evaluation Models for Space Close-Range Inspection Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-24 Jianyong Zhou, Zhipu Hou, Kebo Li
Space close-range inspection can be used to carry out close-range observation and monitoring of targets for identifying the target’s types and working states, which is of great significance for space missions such as in-orbit services. The effectiveness evaluation of space inspection tasks will significantly affect the studies on the trajectory design, orbit motion control, and task termination conditions
-
A Strong Maneuvering Target-Tracking Filtering Based on Intelligent Algorithm Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-11 Jing Li, Xinru Liang, Shengzhi Yuan, Haiyan Li, Changsheng Gao
In this paper, a variable-structure multimodel (VSMM) filtering algorithm based on the long short-term memory (LSTM) regression-deep network (L-DQN) is proposed to accurately track strong maneuvering targets. The algorithm can map the selection of the model set to the selection of the action label and realize the purpose of a deep reinforcement-learning agent to replace the model switching in the traditional
-
Synthesis and Networking of Spaceborne Deployable Prismatic Antenna Mechanisms Based on Graph Theory Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-10 Jialong Zhu, Chuang Shi, Xiaodong Fan, Xiaofei Ma, Hongwei Guo, Shikun Zheng, Rongqiang Liu
Spaceborne deployable cylindrical antennas have broad application prospects in the fields of space earth observation and remote-sensing detection because of their significant advantages of ultralong aperture, high gain, and flexible beam scanning. As application requirements rapidly develop, a new type of spaceborne deployable cylindrical antenna mechanism with a large diameter and deployability is
-
Surface Performance of Titanium Alloy Brake Shell Polished by Industrial Robot Based on Digital Twin Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-8 Haijun Zhang, Shengwei Chen, Hui Wang, Yan Qin
The titanium alloy brake shell is an important component used in aviation, but its surface polishing is mostly done manually, making it difficult to ensure surface quality and consistency. As a result, an industrial robot polishing system based on digital twin is proposed, which can realize the interaction between physical and virtual platforms by using digital twin technology, acquire various parameters
-
Vibration Response Analysis of a Tethered Unmanned Aerial Vehicle System under Transient Wind Field Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2024-1-4 Wei He, Suxia Zhang
The transient wind is one of the dangerous conditions encountered by tethered UAVs operating at the ocean, making the cable and the UAV generate complex nonlinear vibration responses threatening normal operation, even safe flight. There is a lack of research on the nonlinear vibration of the tethered UAV in a transient wind field environment. This study analyzes the vibration response of a tethered
-
Strain Prediction of Grain in Solid Rocket Motor under the Pressure Curing Molding Technology Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-23 Kaining Zhang, Chunguang Wang, Qun Li, Zhenyu Guo
The residual strain generated in grains during the propellant manufacturing process can significantly impact the safety and stability of solid rocket motors. Pressure curing molding technology has been employed as an effective approach to mitigate residual strain. This research paper focuses on deriving a strain prediction function for grains based on continuum mechanics, taking into account the influence
-
Adaptive Distributed Fixed-Time Cooperative Three-Dimensional Guidance Law for Multimissiles against Manoeuvring Target Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-21 Jiwei Gao, Xiaojing Li, Shaofei Zang, Jianwei Ma, Jinpeng Zhang
The problem of cooperative interception of the manoeuvring target is investigated in this paper. Firstly, in light of fast fixed-time consensus theory, time-to-go, and undirected topologies, adaptive cooperative guidance along the line-of-sight (LOS) direction is proposed to guarantee impact time synchronization. Next, novel nonsingular terminal sliding mode (NTSM) is designed to establish adaptive
-
Numerical Simulations of Vertical Discrete Gusts Driven by Trailing Edge Blowing Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-20 Yang Shi, Bo Lu, Peng Guo, Binbin Lv, Hongtao Guo, Li Yu
A new type of gust generator generates the airflow oscillation in the wind tunnel through the Coanda effect of the unsteady trailing edge blowing, which has been shown to have strong potential for accurately simulating discrete gusts. It is necessary to study the relationship between the generated gust characteristics and the control parameters of such devices in order to optimize the design performance
-
A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-14 Shibin Song, Xiao Lu, Haixia Wang
X-ray communication (XCOM) is an emerging laser communication technique for deep space applications. Traditional link acquisition of laser communications depends significantly on Earth support and shows little autonomy. For XCOM, a pulsar vector observation-based link acquisition method is proposed, which utilizes noncooperative pulsars in deep space as beacons to acquire absolute attitude information
-
Distributed Formation Control with Obstacle and Collision Avoidance for Hypersonic Gliding Vehicles Subject to Multiple Constraints Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-12 Zhen Zhang, Yifan Luo, Yaohong Qu
Multiple hypersonic gliding vehicles’ (HGVs’) formation control problems with obstacle and collision avoidance are investigated in this paper, which is addressed in the stage of entry gliding. The originality of this paper stems from the formation control algorithm where constraints of dynamic pressure, heating rate, total aerodynamic load, control inputs, collision avoidance, obstacle avoidance, and
-
An Efficient Trajectory Negotiation and Verification Method Based on Spatiotemporal Pattern Mining Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-12 Yongqi Liu, Miao Wang, Zhaohua Zhong, Kelin Zhong, Guoqing Wang
In trajectory-based operations, trajectory negotiation and verification are conducive to using airspace resources fairly, reducing flight delay, and ensuring flight safety. However, most of the current methods are based on route negotiation, making it difficult to accommodate airspace user-initiated trajectory requests and dynamic flight environments. Therefore, this paper develops a framework for
-
Aerodynamic Analysis of a Logistics UAV with Foldable Bi-wing Configuration Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-12-5 Xiaolu Wang, Wenlong Lu, Weiwei Liu, Changning Chen, Liangyu Zhao
Herein, a twin-boom, inverted V-tailed unmanned aerial vehicle (UAV) featuring a foldable bi-wing configuration is proposed for logistics and transportation applications. We employed the Navier–Stokes solver to numerically simulate steady, incompressible flow conditions. By examining the effects of key design parameters on aerodynamic characteristics and bypass flow fields in a two-dimensional state
-
Flow-Based 6D Pose Tracking of Uncooperative Spacecrafts Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-11-22 Yu Su, Zexu Zhang, Mengmeng Yuan, Yishi Wang
In this work, an optical-flow-based pose tracking method with long short-term memory for known uncooperative spacecraft is proposed. In combination with the segmentation network, we constrain the optical flow area of the target to cope with harsh lighting conditions and highly textured background. With the introduction of long short-term memory structure, the proposed method can maintain a robust and
-
A Two-Level Iterative Node Importance Evaluation of Aircraft Function Modules Based on Influence Matrix Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-11-22 Chang Liu, Jinyan Wang, Kangxing Wang
Accurate evaluation of the critical nodes in the system is essential work for a multiplatform avionics system (MPAS) for resource allocation and other works. However, current evaluation methods are either limited to the aircraft level or the function module level. There is a lack of research on the evaluation using the information of these two levels. In view of this situation, this paper researches
-
Research on Image Super-Resolution Reconstruction Technology Based on Unsupervised Learning Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-11-21 Shuo Han, Bo Mo, Jie Zhao, Bolin Pan, Yiqi Wang
Affected by the movement of drones, missiles, and other aircraft platforms and the limitation of the accuracy of image sensors, the obtained images have low-resolution and serious loss of image details. Aiming at these problems, this paper studies the image super-resolution reconstruction technology. Firstly, a natural image degradation model based on a generative adversarial network is designed to
-
Analysis of Multifrequency GNSS Signals and an Improved Single-Epoch RTK Method for Medium-Long Baseline Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-11-9 Jian Chen, Jiahui Wang, Kaikun Zhang, Wei Duan, Xingwang Zhao, Chao Liu
In recent years, the quantity of visible satellites has increased significantly due to multiple satellite systems that leaped forward. The BeiDou Navigation Satellite System (BDS) and Galileo satellite navigation system (Galileo) broadcast triple-frequency signals and above to users, thus enhancing the reliability, continuity, and availability of the single-epoch real-time kinematic (RTK) positioning
-
Representation Enhancement-Based Proximal Policy Optimization for UAV Path Planning and Obstacle Avoidance Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-11-8 Xiangxiang Huang, Wei Wang, Zhaokang Ji, Bin Cheng
Path planning and obstacle avoidance are pivotal for intelligent unmanned aerial vehicle (UAV) systems in various domains, such as postdisaster rescue, target detection, and wildlife conservation. Currently, reinforcement learning (RL) has become increasingly popular in UAV decision-making. However, the RL approaches confront the challenges of partial observation and large state space when searching
-
TTA-GEP: Terrain Traversability Analysis with Geometry and Environmental Perception for the Path Planning of Planetary Rovers Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-31 Li Yang, Chao Liang, Ximing He, Dengyang Zhao
Terrain traversability analysis (TTA), the key to the navigation of planetary rovers, is significant to the safety of the rover. Therefore, owing to its complexity, the Martian terrain is worth analysing comprehensively based on the terrain variability and hazard level. In this work, we propose a novel method for terrain traversability analysis for the path planning of planetary rovers by integrating
-
Identification of a Stochastic Dynamic Model for Aircraft Flight Attitude Based on Measured Data Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-28 Haiquan Li, Xiaoqian Chen, Jiatu Zhang, Bochen Wang, Jiahui Peng, Liang Wang
Stochastic disturbances are everywhere. The influence of stochastic factors on the modeling and simulation of aircraft flight dynamics should be considered. Therefore, a stochastic differential equation for aircraft flight attitude is modeled based on the traditional one in this paper. After that, an identification method based on the idea of sparse recognition for unknown parameters and stochastic
-
Finite-Time Distributed Cooperative Guidance Law with Impact Angle Constraint Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-26 Wenguang Zhang, Jin Yan
The problem of the distributed cooperative guidance law of multiple missiles attacking a stationary target with impact angle constraint is investigated. A distributed cooperative guidance law, which consists of a nonsingular terminal sliding mode component for ensuring finite time convergence to the desired LOS angle and a coordination component for realizing finite time consensus of time-to-go estimates
-
A Multiple Object Tracker with Spatiotemporal Memory Network Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-26 Peng Xiao, Jiannan Chi, Zhiliang Wang, Fei Yan, Jiahui Liu
Target tracking is an important application of unmanned aerial vehicles (UAVs). The template is the identity of the target and has a great impact on the performance of target tracking. Most methods only keep the latest template of the target, which is intuitive and convenient but has poor ability to resist the change of target appearance, especially to reidentify a target that has disappeared for a
-
GPS-SBAS-Based Orbit Determination for Low Earth Orbiting Satellites Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-26 Mingyu Kim, Jeongrae Kim
A space-based augmentation system (SBAS) provides real-time GNSS correction signals via geostationary satellites for near-ground GNSS users. To use the SBAS correction for low Earth orbit (LEO) satellites, the correction, especially the ionosphere correction, must be adjusted for the LEO altitude. We apply modified SBAS data to LEO satellite onboard navigator to improve the positioning accuracy of
-
A Forward Solution Algorithm of 6RUS Parallel Mechanism Based on Dual Quaternion Method Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-18 Guangyu-yu Dong, Yu-hong Du, Wen-peng Li
The 6RUS parallel manipulator is a highly versatile and widely used robotic mechanism with six degrees of freedom. Its intricate kinematic structure and its capability to perform complex motion tasks have garnered significant research interest in recent years. The kinematic analysis of the 6RUS mechanism plays a crucial role in understanding its operational characteristics and optimizing its performance
-
Microstructure Evolution and Multiscale Heat Transfer Characteristics of Resin-Based Ablative Material under Aerodynamic Heating Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-16 Junjie Gao, Daiying Deng, Haitao Han, Jijun Yu
This paper is aimed at investigating the microstructure evolution of resin-based ablative materials under aerodynamic heating. The microstructure, morphology, material density, and thermophysical parameters at different positions of the material after aerodynamic heating were deeply studied. The changes in the microstructural characteristics of materials caused by complex reaction processes were investigated
-
Satellite Fast Maneuver Control Technology Based on Parallel System Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-13 Youtao Gao, Jinghe Guo, Zhicheng You, Zezheng Dong, Yi Cheng
An on-orbit thrust estimation method of satellite based on parallel system, which can achieve high-efficiency and high-precision thrust estimation, is proposed. A complete satellite maneuvering parallel system framework is constructed. Initially, a real-time artificial model, which is consistent with the actual system, is established. The injection time of maneuvering control is estimated optimally
-
Design of the Space Camera Protection System during Launch Process Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-12 Siyu Wang, Haiying Tian, Changxiang Yan
In order to improve the safety and reliability and maintain the stability of imaging quality when a space camera with a cargo spaceship is launched, a protection system for the space camera is designed. Firstly, according to the mechanical properties of the space camera, a working principle of the protection system is elaborated, and a model of the system is proposed. Secondly, a protective cover and
-
PSiamRML: Target Recognition and Matching Integrated Localization Algorithm Based on Pseudo-Siamese Network Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-12 Jiwei Fan, Xiaogang Yang, Ruitao Lu, Xueli Xie, Siyu Wang
The positioning function of unmanned aerial vehicles (UAVs) is a challenging and fundamental research topic and is the premise for UAVs to realize autonomous navigation. The disappearance of satellite signals makes it challenging to achieve accurate positioning. Thus, visual positioning algorithms based on computer vision have been proposed in recent years and these algorithms have produced good results
-
Cascaded Control System Design for Quadrotor UAV through Relay with Embedded Integrator-Based Automatic Tuning Approach Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-10 Ayaz Ahmed Hoshu, Ghulam E Mustafa Abro, Musaed Alhussein, Irfan Ali Tunio, Khursheed Aurangzeb, Anwar Ali
Due to their enormous characteristics and applicability, quadrotor unmanned aerial vehicles (UAVs) have enjoyed much popularity lately. However, designing a stable control strategy for quadrotors still remains one of the major concerns mainly due to the requirement of an accurate system model. They are naturally underactuated systems, with complex and nonlinear dynamics as well as interaxes couplings
-
Modular Dynamic Modeling for On-Orbit Assembly of Large-Scale Space Structures Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-7 Weiya Zhou, Shunan Wu, Jinzhao Yang
The large-scale space structure during on-orbit assembly is a time-varying system. The dynamic modeling problem of such incrementally increasing space structure is investigated, and a modular dynamic modeling approach is proposed in this paper. The dynamic model of each substructure is first established, and then, a database is designed to store substructure models, which is used for subsequent dynamic
-
Biaxial Tensile Mechanical Properties of HTPB Solid Propellant Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-6 Li Jin, Qinzhi Fang, Xingwei Yan, Qinwei Hu
The purpose of this work is to study the effects of different loading rate ratios and loading speeds on the biaxial tension of hydroxyl-terminated polybutadiene (HTPB) solid propellant. A proper kind of biaxial tensile specimen with which the stresses in its central part can be obtained with the loads acted on each loading direction is designed and used in the study, and the strains in its central
-
Robust Adaptive Beamformer Based on Constant Modulus Penalty Criteria Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-4 Chuanhui Hao, Bin Zhang, Xubao Sun
In this study, a robust adaptive beamformer based on constant modulus (CM) criteria is developed to improve the robustness of the array beamforming, which is a reconstructing minimal optimization for solving the mismatch problem of weight vector caused by steering vector mismatch. In the global positioning system (GPS) L1 band, firstly, a GPS array signal is modelled by designing a dual-polarized antenna
-
Aerodynamic Interaction Characteristics Study of the Ducted Coaxial Propeller for a Novel eVTOL in Hovering Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-3 Junjie Wang, XinFeng Zhang, Jiaxin Lu
The ducted coaxial propeller (DCP) is highly advantageous in the design of eVTOL aircraft due to its safety, compactness, and low noise levels. To study the aerodynamic characteristics of DCP in hovering, a novel eVTOL was used, and a slip grid model was established to solve the three-dimensional unsteady N-S equation. The aerodynamic characteristics of DCP were compared to those of the free coaxial
-
Observation Frequency Analysis for Multiconstellation Radar Systems over the Mediterranean Sea Int. J. Aerosp. Eng. (IF 1.4) Pub Date : 2023-10-3 Marco D’Errico, Maria Daniela Graziano
Observation frequency is analyzed over four areas of the Mediterranean basis where poaching, illegal fishing, and illegal trafficking of goods and people are active. To this end, a geometrical observation and dynamical model is utilized which accounts for multiple satellites and multiple orbital planes and is applied to SIASGE and Sentinel-1 missions. Statistics show that a few hours are needed in