Article
Engineering, Aerospace
Vitaly Shaferman
Summary: The study proposes near-optimal evasion strategies against pursuers using modern linear guidance laws by exploiting time delay in the estimation of the evader's acceleration. Analytically derived and extensively evaluated, these strategies significantly increase miss distance compared to those not leveraging estimation delay.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2021)
Article
Engineering, Aerospace
Keyi Li, Gongjian Zhou
Summary: This article focuses on the modeling and estimation of the state with a destination constraint imposed by PN guidance law in 3-D space. Constraint models for three representative PN guidance laws are presented, and a constrained state estimation method is proposed by incorporating pseudomeasurements into the nonlinear filtering process.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Computer Science, Information Systems
Feng Yang, Guang-Qing Xia, Kai Liu
Summary: This paper introduces the hit-to-kill strategy to solve the 3D robust head-pursuit interception problem with line-of-sight angle constraints. It proposes a target based relative dynamic model for designing the robust HP guidance laws, reinterprets the 3D retro-proportional navigation guidance law, and successfully introduces the concept of nullifying LOS angular rates via sliding mode control. The proposed LOS angles constrained robust HP guidance law is based on nonsingular terminal sliding mode control, and stabilities of the presented guidance laws are analyzed using the Lyapunov approach. Simulation results validate the theoretical statements.
Article
Genetics & Heredity
Karol O. Puchala, Zuzanna Nowak-Zyczynska, Slawomir Sielicki, Wanda Olech
Summary: The main objective of this study was to determine the impact of increased demand for peregrine falcons via breeding on the genetic structure of the birds. The study sampled 374 bird specimens from six countries and calculated the fixation index and level of inbreeding.
Article
Engineering, Aerospace
Diganta Bhattacharjee, Animesh Chakravarthy, Kamesh Subbarao
Summary: This paper proposes a hybrid missile guidance algorithm for planar engagement scenarios, combining nonlinear model predictive control with a collision cone approach. The method achieves interception while ensuring the impact angle lies in a predefined range. The algorithm includes two components: point-mass-based NMPC and collision-cone-based NMPC, with established connections between impact angle and collision cone. These NMPC problems are formulated as strictly convex quadratic programs, demonstrated to be effective through detailed simulations.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2021)
Article
Multidisciplinary Sciences
Lei Feng, Wang Lu, Fenglin Wang, Fan Zhang, Qiangui Sun
Summary: Based on a modified proportional navigation guidance interceptor, this paper establishes a three-dimensional mathematical model for the attack-defense confrontation between high-speed vehicles and the interceptor. The model incorporates the modified proportional navigation guidance law of the interceptor, as well as control constraints, pitch angle velocity constraints, and dynamic delay. Analytical solutions for the optimal speed roll angle and the optimal overload of the high-speed vehicles are obtained under the condition of considering 180-degree BTT control. The simulation results demonstrate that the proposed optimal penetration guidance law can achieve a miss distance of more than 5 m when the overload capacity ratio is 0.33.
Article
Engineering, Aerospace
Weilin Wang
Summary: This paper proposes a new space operation concept that enables two CubeSats equipped with only optical sensor to achieve autonomous and robust proximity with uncooperative satellites. The use of optical sensors is compelling because they are lightweight and reduce reliance on external measurement sources. The paper introduces a new guidance scheme called cooperative augmented proportional navigation (CAPN) that utilizes angle measurement data to approach maneuvering targets. Simulation results demonstrate that CAPN is capable of completing challenging proximity missions.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Engineering, Aerospace
Hongyan Li, Hong Tao, Jiang Wang, Shaoming He
Summary: This paper investigates the problem of intercepting an evasive target with maneuverability comparable to the missile in three dimensions. The necessary condition for interception without terminal maneuverability advantage is derived geometrically in the relative frame. An analytically derived two-stage optimal guidance law with bounded acceleration is proposed to satisfy the necessary condition. The key feature of the proposed approach is its fast convergence rate and low acceleration requirement, which significantly improves the operational margin and decreases the risk of command saturation.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2023)
Article
Genetics & Heredity
Andrea Zuccolo, Sara Mfarrej, Mirko Celii, Saule Mussurova, Luis F. Rivera, Victor Llaca, Nahed Mohammed, Arnab Pain, Abdulmajeed Fahad Alrefaei, Abdulwahed Fahad Alrefaei, Rod A. Wing
Summary: This study sequenced and assembled the genome of the gyrfalcon species using third-generation sequencing strategies and optical maps. The assembled genome showed high contiguity and completeness. Comparative analysis with other avian genomes revealed several genome rearrangements, including nine putative chromosome fusions in the gyrfalcon genome.
G3-GENES GENOMES GENETICS
(2023)
Article
Engineering, Aerospace
Yuanzhuo Geng, Li Yuan, Yanning Guo, Liang Tang, Huang Huang
Summary: This paper proposes two pursuit strategies for positioning the evader within the pursuer's imaging zone. It applies geometry analysis and fixed-time near-fuel-optimal guidance law to calculate the shortest path and ensure the impulse magnitude is within the allowable range. The paper also illustrates the superiority of this method over the Sequence Quadratic Programming (SQP) method in terms of robustness and computation efficiency. For the maneuvering evader, the proximal policy optimization (PPO) algorithm is used to train and guide the pursuer intelligently.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Jingchuan Tang, Zongyu Zuo
Summary: This paper presents a new class of distributed cooperative guidance laws based on circular guidance and practical prescribed-time consensus, under both undirected and directed communication topologies. A bias term is added to the circular guidance law to achieve impact time synchronization within a prescribed time. The time-to-go expression under the circular guidance law is utilized for accurate impact time cooperation. The proposed guidance laws ensure both convergence rate and reduction in acceleration magnitude due to the practical prescribed-time consensus. Additionally, they are extended to nonmaneuvering targets based on predicted interception point. Numerical simulations in different scenarios validate the effectiveness, robustness, and superiority of the proposed guidance laws.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2023)
Article
Engineering, Aerospace
Hyeong-Geun Kim, Hyeonbeom Lee
Summary: This article presents a composite guidance law with a three-stage proportional navigation structure for the simultaneous arrival of multiple missiles. It proposes different navigation constants at each stage to achieve the desired impact time. The proposed law sequentially increases, maintains, and decreases the look angle to satisfy the seeker's field-of-view constraint. The simple PN-based structure of the law provides an exact closed-loop solution and useful information for practical implementation.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Engineering, Aerospace
Siddhardha Kedarisetty, Tal Shima
Summary: This work presents a novel guidance strategy that achieves multiple mission specifications by constructing an interceptor trajectory using sinusoidal waves and following the desired trajectory by maintaining a geometric constant G=0.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2023)
Article
Engineering, Aerospace
Biao Ma, Mou Chen, Yaohua Shen, Mihai Lungu
Summary: This paper studies the inverse optimal guidance law for intercepting a maneuvering target in a two-dimensional plane. The robustness is enhanced by introducing an integral state and a disturbance observer, and the inverse optimal guidance law is designed to reduce the adverse effect of disturbances.
Article
Computer Science, Information Systems
Amit Kumar
Summary: This paper presents a novel approach for tracking and landing a quadcopter on a moving target using ultrasonic sensor instead of camera or other vision sensors. The performance of the quadcopter is evaluated based on the time and distance traveled during the tracking and landing phases.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Biology
Stephen M. Rogers, Joanna Riley, Caroline Brighton, Gregory P. Sutton, Darron A. Cullen, Malcolm Burrows
JOURNAL OF EXPERIMENTAL BIOLOGY
(2016)
Article
Multidisciplinary Sciences
Caroline H. Brighton, Adrian L. R. Thomas, Graham K. Taylor
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2017)
Article
Multidisciplinary Sciences
Swidbert R. Ott, Heleen Verlinden, Stephen M. Rogers, Caroline H. Brighton, Pei Shan Quah, Rut K. Vleugels, Rik Verdonck, Jozef Vanden Broeck
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2012)
Article
Multidisciplinary Sciences
Caroline H. Brighton, Graham K. Taylor
NATURE COMMUNICATIONS
(2019)
Article
Environmental Sciences
Kieran P. McCloskey, Katherine E. Chapman, Lucille Chapuis, Mark McCormick, Andrew N. Radford, Stephen D. Simpson
ENVIRONMENTAL POLLUTION
(2020)
Article
Behavioral Sciences
Caroline H. Brighton, Lillias Zusi, Kathryn A. McGowan, Morgan Kinniry, Laura N. Kloepper, Graham K. Taylor
Summary: The behaviors of predators and prey can impact catch success and predation risk, with lone bats being more vulnerable to attacks. The success of hawk attacks is determined by their maneuvers, with high-speed stoops and rolling grabs being more successful. Lone bats are attacked disproportionately often, but hunting efficiency is not decreased by group vigilance or confusion.
BEHAVIORAL ECOLOGY
(2021)
Article
Multidisciplinary Sciences
Sophie L. Nedelec, Andrew N. Radford, Peter Gatenby, Isla Keesje Davidson, Laura Velasquez Jimenez, Maggie Travis, Katherine E. Chapman, Kieran P. McCloskey, Timothy A. C. Lamont, Bjorn Illing, Mark McCormick, Stephen D. Simpson
Summary: This study demonstrates that reducing noise pollution can improve animal reproductive success and enhance the resilience of coral reef ecosystems, based on field and laboratory experiments with a model fish system on the Great Barrier Reef.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Marco KleinHeerenbrink, Lydia A. France, Caroline H. Brighton, Graham K. Taylor
Summary: This study examines the swooping trajectories of perching Harris' hawks and finds that they aim to minimize the distance flown after stalling, rather than minimizing time or energy consumption. The findings also suggest a heuristic principle that could guide reinforcement learning of autonomous perching.
Article
Multidisciplinary Sciences
Caroline H. Brighton, Laura N. Kloepper, Christian D. Harding, Lucy Larkman, Kathryn McGowan, Lillias Zusi, Graham K. Taylor
Summary: This study shows that hawks attacking swarming bats avoid confusion by steering towards a fixed point in the swarm instead of targeting any one individual.
NATURE COMMUNICATIONS
(2022)
Article
Behavioral Sciences
Katherine E. Chapman, Nathalie E. Cozma, Arran B. J. Hodgkinson, Roger English, Kevin J. Gaston, Natalie Hempel de Ibarra
Summary: The diel activity of diurnal pollinating insects decreases before the end of the day, but certain species like bumble bees can continue foraging in the period before sunset. The study focused on pollen foraging in buff-tailed bumble bees during the hour before sunset and compared it to the afternoon period. The researchers found that evening foragers returned to the colony with partial pollen loads, and those returning in lower light levels had smaller loads. The decline in light is likely to be an important factor guiding the decisions of bumble bees and other diurnal pollinators regarding foraging extension or cessation and colony return.