scholarly journals Modified Bezier Curve for 4D Reference Trajectory Definition under Flight Profile Constraint

2008 ◽  
Author(s):  
Thierry Miquel ◽  
Felix Mora-Camino
Keyword(s):  
Bézier Curve ◽  
Bezier Curve ◽  
Reference Trajectory ◽  
Flight Profile

scholarly journals Neural Network Assisted Inverse Dynamic Guidance for Terminally Constrained Entry Flight

2014 ◽  
Vol 2014 ◽  
pp. 1-12
Author(s):  
Hao Zhou ◽  
Tawfiqur Rahman ◽  
Wanchun Chen
Keyword(s):  
Neural Network ◽  
Terminal Velocity ◽  
Bézier Curve ◽  
Bezier Curve ◽  
Reference Trajectory ◽  
Inverse Dynamic ◽  
Guidance Law ◽  
Terminal Constraints ◽  
Entry Guidance ◽  
Improved Performance

This paper presents a neural network assisted entry guidance law that is designed by applying Bézier approximation. It is shown that a fully constrained approximation of a reference trajectory can be made by using the Bézier curve. Applying this approximation, an inverse dynamic system for an entry flight is solved to generate guidance command. The guidance solution thus gotten ensures terminal constraints for position, flight path, and azimuth angle. In order to ensure terminal velocity constraint, a prediction of the terminal velocity is required, based on which, the approximated Bézier curve is adjusted. An artificial neural network is used for this prediction of the terminal velocity. The method enables faster implementation in achieving fully constrained entry flight. Results from simulations indicate improved performance of the neural network assisted method. The scheme is expected to have prospect for further research on automated onboard control of terminal velocity for both reentry and terminal guidance laws.

Optimal Bezier Curve Modification Function for Contrast Degraded Images

2021 ◽  
Vol 70 ◽  
pp. 1-10
Author(s):  
Bharath Subramani ◽  
Ashish Kumar Bhandari ◽  
Magudeeswaran Veluchamy
Keyword(s):  
Bézier Curve ◽  
Bezier Curve ◽  
Degraded Images

scholarly journals Automatic Lane-Changing Decision Based on Single-Step Dynamic Game with Incomplete Information and Collision-Free Path Planning

Actuators ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 173
Author(s):  
Hongbo Wang ◽  
Shihan Xu ◽  
Longze Deng
Keyword(s):  
Path Planning ◽  
Dynamic Game ◽  
Single Step ◽  
Bézier Curve ◽  
Vehicle Safety ◽  
Bezier Curve ◽  
Lane Change ◽  
Hardware In The Loop ◽  
Power Performance ◽  
Lane Changing

Traffic accidents are often caused by improper lane changes. Although the safety of lane-changing has attracted extensive attention in the vehicle and traffic fields, there are few studies considering the lateral comfort of vehicle users in lane-changing decision-making. Lane-changing decision-making by single-step dynamic game with incomplete information and path planning based on Bézier curve are proposed in this paper to coordinate vehicle lane-changing performance from safety payoff, velocity payoff, and comfort payoff. First, the lane-changing safety distance which is improved by collecting lane-changing data through simulated driving, and lane-changing time obtained by Bézier curve path planning are introduced into the game payoff, so that the selection of the lane-changing start time considers the vehicle safety, power performance and passenger comfort of the lane-changing process. Second, the lane-changing path without collision to the forward vehicle is obtained through the constrained Bézier curve, and the Bézier curve is further constrained to obtain a smoother lane-changing path. The path tracking sliding mode controller of front wheel angle compensation by radical basis function neural network is designed. Finally, the model in the loop simulation and the hardware in the loop experiment are carried out to verify the advantages of the proposed method. The results of three lane-changing conditions designed in the hardware in the loop experiment show that the vehicle safety, power performance, and passenger comfort of the vehicle controlled by the proposed method are better than that of human drivers in discretionary lane change and mandatory lane change scenarios.

Reconstruct unrecoverable data in real-time networks using Bézier curve

2015 ◽  
Vol 9 (5) ◽  
pp. 596-602
Author(s):  
Dwi Agung Nugroho ◽  
Syamsul Rizal ◽  
Dong-Seong Kim
Keyword(s):  
Real Time ◽  
Bézier Curve ◽  
Bezier Curve
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