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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Military Science and Technology
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The Korea Institute of Military Science and Technology
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Volume & Issues
Volume 19, Issue 3 - Jun 2016
Volume 19, Issue 2 - Apr 2016
Volume 19, Issue 1 - Feb 2016
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Performance Analysis of Pneumatic Device for Verification of Canard Deployment Performance
Lee, Donghoon ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 145~154
DOI : 10.9766/KIMST.2016.19.2.145
In this paper, a pneumatic device for the deployment performance verification of canards deployed by inertia has been designed and the performance of the pneumatic device has been proven through analysis and tests. The pneumatic conveying process, orifice opening process and piston movement process of the pneumatic device were investigated by using numerical methods. The orifice diameter, pressure in a pressure tank and type of gas were regarded as the main design parameters of the pneumatic device. The error rate between analysis and test results under the same conditions was within 4 %. The accuracy of numerical methods used in this study were validated.
Towed Array Shape Estimation based on Kalman Filter Compensating the Sensor Bias
Kim, Geun Hwan ; Choi, Su Jin ; Ryu, Chang Soo ; Ryu, Young Woo ; Lee, Kyun Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 155~162
DOI : 10.9766/KIMST.2016.19.2.155
TASS(Towed Array Sonar System) is a sonar system which tows the sensor array behind a platform. Array shape is generally assumed to be a straight line. But the array shape is often distorted by oceanic current or platform maneuvering which causes the performance loss of signal processing method like beamforming. So array shape estimation methods are needed. Typically the method based on Kalman filter using heading sensor is used. In practice, the measurement is corrupted by biases which are caused by rotation of the tow cable, varying magnetic fields and slowly varying stresses in the mechanical construction. Although they can`t be calibrated but can be estimated. In this paper, we suggest the array shape estimation method based on Kalman filter compensating the sensor biases.
Compensation Method of Tropospheric Delay Model Error for Ground Navigation using Meteorological Data in Korea
So, Hyoungmin ; Lee, Kihoon ; Park, Junpyo ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 163~170
DOI : 10.9766/KIMST.2016.19.2.163
Tropospheric delay is one of the largest error source in pseudolite navigation system. Because a pseudolite is installed on the ground and transmits its signal to a user in the air or on the ground, the conventional tropospheric delay model developed for a satellite navigation doesn`t work properly. In this paper, performance analysis of several pseudolite tropospheric delay models has been done using meteorological data. Based on the result, a new compensation method for Hopfield model has been proposed.
An Integration Study of the Firing Test Stage at the Acceptance Test for the Propelling Charge
Kim, Jaekab ; Kim, Jaehoon ; Na, Taeheum ; Kim, Bokyun ; Park, Noseok ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 171~176
DOI : 10.9766/KIMST.2016.19.2.171
In this paper, the integration of the firing test stages at the acceptance test of the propelling charge has been studied using statistical analysis on the basis of the test data of K676 and K677 propelling charge for K9 self propelled howitzer. Acceptance test of K676 / K677 propelling charge consists of 3 stages and each stage is charge assessment test, charge uniformity test and charge proving ground test. Many of rounds are fired and much money is spent to prove the charge performance at each stage. The result of t-test shows that there is no difference between charge uniformity and charge proving ground test stage of K676 and K677 propelling charge.
Recursive Bayesian Filter based Strike Velocity Estimation for Small Caliber Projectile
Kim, Jong-Hwan ; Jo, Seungsik ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 177~184
DOI : 10.9766/KIMST.2016.19.2.177
This paper presents a strike velocity estimation using the recursive Bayesian filter that operates both correction and prediction models to probabilistically remove noises of sensors and accurately estimate the strike velocity during the real-time experiments. Four different types of bullets such as 5.56 mm M193, 7.62 mm M80, 5.45 mm 7N10 and 7.62 mm MSC were used to validate the proposed method. Compared to the existing method, the proposed method statistically results in higher stability of the strike velocity estimation as well as its reliability for the ballistic limit velocity computation.
Implementation of Virtual Maritime Environment for LWIR Homing Missile Test
Park, Hyeryeong ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 185~194
DOI : 10.9766/KIMST.2016.19.2.185
It is essential for generating the synthetic image to test and evaluate a guided missile system in the hardware-in-the-loop simulation. In order to make the evaluation results to be more reliable, the extent of fidelity and rendering performance of the synthetic image cannot be left ignored. There are numerous challenges to simulate the LWIR sensor signature of sea surface depending on the incident angle, especially in the maritime environment. In this paper, we investigate the key factors in determining the apparent temperature of sea surface and propose the approximate formula consisting of optical characteristics of sea surface and sky radiance. We find that the greater the incident angle increases, the larger the reflectivity of sea surface, and the greater the water vapor concentration in atmosphere increases, the larger the amount of sky radiance. On the basis of this information, we generate the virtual maritime environment in LWIR region using the SE-WORKBENCH, physically based rendering software. The margin of error is under seven percentage points.
An Experimental Study on the Ballistic Accuracy by Air Guide Grooves
Kim, Junkyu ; Kim, Hyungse ; Lee, Moonhwan ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 195~201
DOI : 10.9766/KIMST.2016.19.2.195
An experimental study has been found the air guide grooves for reducing drag. When a bullet is fired and move in the air, the drag is generated. The vortex which is one of the types of drag hinders the movement of the bullet. To solve this phenomenon, cut a negative grooves that we are called the air guiding grooves at the back of bullet. The grooves bullet has identified that the drag compared to conventional ammunition(KM80 and K193) is reduced to 4.480 and 4.054 : 10 % through a Finite Analysis Program(
). Even pressure center was retreating 0.72 % compared to a Bullet(KM80 and K193). Effect obtained with these results is the accuracy of the grooves bullet in a shooting test was improved by over 32 %(KM80: 2.86, air guide grooves : 1.94) compared to conventional ammunition(KM80 and K193). In addition, muzzle velocity is increased 73 m/s. This is expected to be extended the velocity and effective range of bullet. Also, the velocity of the grooves bullet is increased when moving in the air while the velocity of the bullet(KM80 and K193) is reduced. The gas ejected from the muzzle to be balanced and stable flight of the Bullet. Given these effects, we can reckon the air guide grooves have positive influence.
Numerical Analysis of Temperature Distribution of the Explosive Material in the Double-Layer Liners
Mun, Sang Ho ; Kim, See Jo ; Lee, Chang Hee ; Lee, Seong ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 202~210
DOI : 10.9766/KIMST.2016.19.2.202
The development of new concepts of liner is of great importance to effectively neutralize the enemy`s attack power concealed in the protective structure or armored vehicles. A double layer liner has a combination of two different materials, one for penetration of target and the other for explosion after penetration. Therefore, it is of great importance to understand the temperature distribution before impact which should be lower than the explosive temperature of pure explosive material of the liner used. In this study, two different liner materials were obtained using cold spray coating and these material properties were characterized by DSC experiments. Numerical computations were done and the effect of temperature distribution and changes over time at each point of the explosive material depending on the layer types of the liner were discussed and analysed in the jet state.
Analysis for Performance of the HT-PEFC based Auxiliary Power Unit by Aspen Plus Software
Yu, Minkyu ; Park, Ji-il ; Kwon, Hyuksang ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 211~217
DOI : 10.9766/KIMST.2016.19.2.211
The fuel cell based auxiliary power unit (APU) is promising for power source of armed vehicles due to its silence and high efficiency. Especially, the on board hydrogen generation and fed to fuel cell system was core technology of this power system. In this study, we analyzed the performance of the Auto thermal reactor (ATR) that produce the hydrogen from the fuel, integrated High temperature polymer electrolyte fuel cell (HT-PEFC) by Aspen plus software. The fuel was designed as a n-dodecane for analysis of military fuel (JP-8).
A Study on Measurement of Gun`s Attitude of K2 MBT Using Inertial Navigation System and Its Effects on the Hit Probability
Kim, Sungho ; Kim, GunKook ; Kwon, Hyukmin ; Yu, Sukjin ; Park, Byunghoon ; Lee, Byunggil ; Kim, Euiwhan ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 218~226
DOI : 10.9766/KIMST.2016.19.2.218
In the original design of K2 tank the Vertical Sensor Unit(VSU) was mounted to measure the attitude of the main gun to enhance the hit probability. In this research, as a part of efforts to reduce the cost of K2, it was theoretically simulated and evaluated to use the data from Inertial Navigation System(INS) for the calculation of the gun attitude instead of the direct measurement using VSU. It was found that the negative effect of INS approach is negligible and the elimination of VSU is technically possible and beneficial to the system.
Modeling and Simulation for the Initial Dynamics of a High Speed Underwater Vehicle Ejected from a Submerged Mother Ship
Yoon, Hyeon Kyu ; Cho, Hyeonjin ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 227~235
DOI : 10.9766/KIMST.2016.19.2.227
Heavy-weight high speed underwater vehicle(HSUV) is launched from the submerged mother ship. For the safety point of view, it is important to confirm whether the HSUV would touch the launching mother ship. In this paper, the hydrodynamic force and moment were modeled by the polynomials of motion variables and the simple lift and drag acting on a plate and cylinder which consist of the HSUV`s several parts. The mother ship was assumed as the Rankine half body to consider the flow field near the moving ship. Such hydrodynamic force and moment were included in the 6 DOF equations of motion of the HSUV and the dynamic simulations for the various conditions of the HSUV until the propeller activation were performed. Developed simulation program is expected to reduce the number of expensive sea trial test to develop safety logic of the HSUV at the initial firing stage.
The Threat List Acquisition Method in an Engagement Area using the Support Vector Machines
Koh, Hyeseung ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 236~243
DOI : 10.9766/KIMST.2016.19.2.236
This paper presents a threat list acquisition method in an engagement area using the support vector machines (SVM). The proposed method consists of track creation, track estimation, track feature extraction, and threat list classification. To classify the threat track robustly, dynamic track estimation and pattern recognition algorithms are used. Dynamic tracks are estimated accurately by approximating a track movement using position, velocity and time. After track estimation, track features are extracted from the track information, and used to classify threat list. Experimental results showed that the threat list acquisition method in the engagement area achieved about 95 % accuracy rate for whole test tracks when using the SVM classifier. In case of improving the real-time process through further studies, it can be expected to apply the fire control systems.
HLA/RTI based on the Simulation Composition Technology
Kim, Jingyu ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 244~251
DOI : 10.9766/KIMST.2016.19.2.244
In defense domain, mission level and engagement level simulation tools exist. In order to experiment a simulation scenario for obtaining results of both mission level and engagement level simulations, we should write a same simulation scenario in a mission level simulation tool as well as an engagement level simulation tool, and we have to operate these tools for analysis of each purpose. Moreover, we could not guarantee that these scenarios are completely same since each scenario is composed of different fidelities of simulation models, although the scenarios are written by a same experimenter and with same simulation purpose. To deal with the difficulties, I propose an approach to analysis of both mission level and engagement level simulations from one simulation result. For this, I have built Composite Combat Mission Planning Simulation Environment (CCMPSE). In this paper, the HLA/RTI based simulation composition technology and my experiences for the designed Composite Combat Mission Planning Simulation Control System (CCMPSCS) are explained. Moreover, This paper also conducts a case study with EADSIM, SADM, and the CCMPSCS. Finally, this paper provides lesson learned from the case study.
A Study on Ship Path Planning Algorithm based on Real-time Ocean Environment
Kim, Dongjun ; Seol, Hyeonju ; Kim, Jinju ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 252~260
DOI : 10.9766/KIMST.2016.19.2.252
Unlike terrestrial transportation, marine transportation should consider environment factors in order to optimize path planning. This is because, ship`s path planning is greatly influenced by real-time ocean environment-sea currents, wave and wind. Therefore, in this study, we suggest a ship path planning algorithm based on real-time ocean environment using not only
algorithm but also path smoothing method. Moreover, in order to improve objective function value, we also consider ship`s moving distance based on ship`s location and real-time ocean environment data on grid map. The efficiency of the suggested algorithm is proved by comparing with
algorithm only. This algorithm can be used as a reasonable automatics control system algorithm for unmaned ship.
A Study on the Influence of C4I System Quality on Operational Performance : Role of Perceived Usefulness and User Satisfaction
Jeong, Young Sin ; Park, Jong Woo ; Jo, Dong Hyuk ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 261~271
DOI : 10.9766/KIMST.2016.19.2.261
The need and interest for a successful operation of Information System in the defense industry have increased due to a rapid development in ICT. However, research on adderssing such increased demand has been minimal. This paper introduces a Success Model for IS in the defense field based on literature reviews, and proves the performance of the proposed model. The verification results show that the quality factors of IS have positive influence on perceived usefulness and user satisfaction. The results, as well, imply that perceived usefulness and user satisfaction improves the operational performance of IS. Therefore, this study proves that quality factors of IS increase the operational performance through perceived usefulness and user satisfaction. Through this research, the patterns of information utilization in the defense IS is understood, and the directions for improving the operational performance of IS is presented.
Effective Use of Radio Altimeter in GPS/DME Integrated Navigation Systems
Koo, Moonsuk ; So, Hyoungmin ; Oh, Sang Heon ; Hwang, Dong-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 19, issue 2, 2016, Pages 272~279
DOI : 10.9766/KIMST.2016.19.2.272
Many researches on use of local ground navigation systems can be found to overcome vulnerability of GNSS. Effective use of an altimeter is proposed in GNSS/DME integrated navigation systems. A weighted DOP based on statistics of measurement error is derived for a given vehicle motion trajectory. From the derived DOP, the vertical error is estimated. By comparing the estimated vertical error with error specification of the altimeter, use of the altimeter is determined in the GPS/DME integrated navigation systems. In order to show effectiveness of the proposed method, 50 times Monte-Carlo simulations were performed for a GPS/DME integrated navigation system. The results show that the proposed method gives more accurate navigation outputs when the number of GPS satellites in view varies.