Daekyu Sang - Academia.edu (original) (raw)

Papers by Daekyu Sang

Electro-Optical and Infrared Systems: Technology and Applications XX

A target localization method and the Salvo attack case with multiple missiles, equipped with a pa... more A target localization method and the Salvo attack case with multiple missiles, equipped with a passive tracking sensor, are considered. A hybrid target localization filter for the passive sensor equipped missile is presented, which is composed of EKF (Extended Kalman Filter) for using its own measurement, and PF (Particle Filter) for merging the other's measurement in multiple missile involved salvo attack case. The proposed tracking filter just uses the other missile's measurements only, so it is not affected by the performance of the other missile's tracking filter. If the missiles are equipped with only a passive sensor for target tracking and communicated by data-link, they can localize the target without performing passive ranging using the proposed tracking filter. It shows the possibility of applying passive sensor equipped missiles to the impact time critical Salvo-attack case.

2009 ICCAS-SICE, Nov 13, 2009

To design the more accurate trajectory of a soft lunar landing, the constraints on the powered de... more To design the more accurate trajectory of a soft lunar landing, the constraints on the powered descent sub-phase, such as a breaking phase, an approach phase, a terminal descent phase, have to be considered. In this paper, the trajectory optimization of the lunar landing was performed considering constraints on the sub-phase of the powered descent phase. To convert the optimal control problem, the Legendre pseudospetral (PS) method was used and C code for feasible sequential quadratic programming (CFSQP) was used as the NLP solver.

Springer eBooks, Aug 9, 2007

D.-S. Huang, L. Heutte, and M. Loog (Eds.): ICIC 2007, CCIS 2, pp. 596604, 2007. © Springer-Verl... more D.-S. Huang, L. Heutte, and M. Loog (Eds.): ICIC 2007, CCIS 2, pp. 596604, 2007. © Springer-Verlag Berlin Heidelberg 2007 ... Autopilot Design Using Hybrid PSO-SQP Algorithm ... Byoung-Mun Min1, Hyeok Ryu2, Daekyu Sang1, Min-Jea Tahk1, and David Hyunchul ...

New guidance law, based on Lyapunov stability theory and applied parameter optimization method, i... more New guidance law, based on Lyapunov stability theory and applied parameter optimization method, is proposed, which can minimize miss distance and adjust impact angle to predefined value. Using LOS angle and predefine impact angle, we define the state variables and propose a lyapunov function candidate for driving structure of the guidance law and conditions of gain parameters. The PSO algorithm is used for selecting the guidance gains, which satisfies the necessary condition of stability of the guidance loop. This new guidance law has simple structure, shows robustness about different engagement conditions, and provides wider capture area than conventional algorithm considering impact angle only.

2009 European Control Conference (ECC), 2009

Journal of the Korean Society for Aeronautical & Space Sciences, 2012

Aerodynamic analysis(DATCOM) and radar cross section(RCS) analysis(POFACETS) were integrated for ... more Aerodynamic analysis(DATCOM) and radar cross section(RCS) analysis(POFACETS) were integrated for the air-to-surface missile concept design using a design framework. The missile geometry was defined based on the CAD(CATIA) for synchronizing the manufacturing with design processes. Aero/RCS analyses were linked with the CAD process under the ModelCenter framework in order to receive the geometry data automatically. The missile design baseline configuration was selected from ROC(requirement of capability). Then the RCS minimization was performed subject to thelargerthebetter constraint of the missile lift-to-drag ratio. This study demonstrated that various design strategies can be performed efficiently about many missile configurations using this design framework in the missile conceptual design phase.

Communications in Computer and Information Science

AIAA Guidance, Navigation and Control Conference and Exhibit, 2008

... 90 Daekyu Sang, Chang-Kyung Ryoo and Min-Jea Tank 2 Target MISSILE Fig. 3. The relationship b... more ... 90 Daekyu Sang, Chang-Kyung Ryoo and Min-Jea Tank 2 Target MISSILE Fig. 3. The relationship between missile and target Differentiate Eq. (3) 0=&amp;amp;lt;7-A The rate of line of sight angle (&amp;amp;amp;) can be expressed as below. VM • sinA R (3) (4) (5) TM Using Eq.(4), Eq.(5) and the ...

SICE Annual Conference 2007, 2007

The fundamental problem in the autopilot design for missile systems is to provide satisfactory st... more The fundamental problem in the autopilot design for missile systems is to provide satisfactory stability, performance, and robustness for all flight conditions which may occur in probable engagements. A conventional approach to handle nonlinearity and time-varying nature ...