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Optimal Phase Angle Design for the Lunar Lander |
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Dong-Hyun Cho, Hae-Dong Kim(KARI (Korea Aerospace Research Institute), Republic of Korea) |
| To design the optimal lunar landing trajectory, the periapsis of de-orbit burn phase is usually used as a starting point of the powered descent phase. However,it is possible to exist another phase angle to reduce the fuel instead of zero for periapsis of de-orbit burn phase.To find out this optimal phase angle, in this paper, the initial free state optimal problem method is applied without any additional assumption and change of hardware for the traditional optimal lunar landing problem. |
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A guidance logic development for wake homing guidance system |
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DaeHyuk Kim, Nakwan Kim(Seoul National University, Republic of Korea) |
| Wake homing guidance is the tracking guidance method that enables an underwater vehicle to follow the wake trajectory which a target ship remains. Because wake detection region by a wake sensor is not wide enough, wake is detected only when the vehicle get to near the wake. It cannot be known real wake trajectory, existing well-developed guidance method is not applicable, so it is needed to guidance method to tracking unknown trajectory. This paper presents a guidance logic for wake homing guidance system. First of all, the concept of the wake modelling and detection is described. ... |
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Implementation and Application of Guidance law using Aerodynamic Data for Simulation Purposes |
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Wei Zhang, Jianyun JIN, Khayyam Masood, Lin LI, Zehao MA(Northwestern Polytechnical University, China) |
| This paper describes a new technique for simulating the guidance of a SAM without the help of a controller.forces. The forces update the current information and LOS (line of sight) of the guidance block thus creating a closed loop system. This technique has a unique solution for a unique guidance algorithm thus ensuring the path followed by the SAM is only dependent on guidance algorithm. This enables an efficient way to diagnose which guidance algorithm is suitable for a particular system without getting into the complexity of updating the controller and re-tuning of controller gains. |
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Development of a GPS/INS integrated navigation system for model aircraft |
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Nguyen Vinh Hao, Duong Bach Phi(HoChiMinh City University of Technology, Viet Nam) |
| This paper addresses the development of an integrated navigation system based on MEMS inertial sensors and GPS for model aircraft. The objective of this paper is to propose a loosely coupled GPS/INS integration approach using Extended Kalman filter to estimate aircraft’s position, velocity, and attitude. Special attention is paid to the
computational performance of the algorithm and the handling of GPS outages. The simulation results based on a typical high dynamic flight trajectory validate that the proposed filter is applicable to flight navigation |
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Response Surface Smoothing for Wind Tunnel Testing Based on Design of Experiment with Subspace Partitioning |
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Dongoo Lee, Jaemyung Ahn(KAIST, Republic of Korea), Se-Yoon Oh(Agency for Defense Development, Republic of Korea) |
| This paper presents a new approach in resolving discontinuities between subspaces when the subspace partitioning method is applied to measure aerodynamic coefficients. The discontinuities between response surfaces in each subspace can be smoothened by overlapping between subspaces and integrating with proper interpolation. The Central Composite Design (CCD) is used to reduce experimental points. The test model base is the lambda wing configuration of the UCAV 1303. The study was carried out at the low speed wind tunnel of the Agency for Defense Development (ADD-LSWT). |
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Automatic Typhoon eye identification using QuikSCAT data and spiral cloud Image |
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Kulwarun Warunsin, Orachat Chitsobhuk(King Mongkuts Institute of Technology Ladkrabang, Thailand) |
| This paper presents an automatic typhoon eye identification using combined features from QuikSCAT satellite and spiral cloud image. Using only cloud information may lead to excessive time to achieve the search solution if encountering ambiguous cloud shape. Therefore, QuikSCAT wind information is used to estimate the candidate region of interest (ROI) and eye location in order to restrain searching range of spiral cloud. The candidate eye location is further expanded to search for the best eye location using the spiral curve model (SCM). The experimental results demonstrate significant improve |
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