• Title, Summary, Keyword: Ballistic Factor

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Performance Analysis of the Discrimination between Space-targets Using the Maneuvering (기동특성을 사용한 우주표적들 간의 변별 성능 분석)

  • Choi, In-O;Kang, Ki-Bong;Kim, Si-Ho;Jung, Joo-Ho;Kim, Kyung-Tae;Park, Sang-Hong
    • 한국정보기술학회논문지
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    • v.15 no.11
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    • pp.55-63
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    • 2017
  • Detection and tracking of ballistic missile can be possible when the discrimination between space-targets is possible. Since representative space-targets such as warhead and decoy have similar shapes, radar crosssection (RCS) and high resolution range profile are not suitable for discrimination. In this paper, an effective discrimination method based on the ballistic factor is proposed. The proposed method uses Kalman-filter to track a real-time maneuvering trajectory and extracts the ballistic factor from an estimated trajectory at altitudes less than 100km. Since the ballistic factor of warhead is generally larger than decoys, effective discrimination is conducted. In simulations using the RCS values predicted by the physical optics in which targets are engaged in high-maneuver and micro-motion, the proposed method efficiently discriminated targets.

Study on radar deployment for improving the ballistic missile detection probability (탄도미사일 탐지 확률 향상을 위한 레이더 배치에 관한 연구)

  • Park, Tae-yong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.518-520
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    • 2014
  • Radar Cross Section(RCS) is very important factor to detect target by radar. Even if the same target, RCS value is significantly different according to the direction facing the radar. Therefore, it is advantageous to place the radar, where RCS is larger to increase the probability of detecting a target with a radar. North Korean ballistic missiles are major threat to our security, ballistic missiles should be detected early and traced for ballistic missile defense. In this paper, it is analyzed that ballistic missile's RCS characteristics and trajectory and proposed a way of radar deployment to improve the detection probability of ballistic missile.

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Test and estimation of ballistic armor performance for recent naval ship structural materials

  • Shin, Yun-ho;Chung, Jung-hoon;Kim, Jong-Hwan
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.10 no.6
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    • pp.762-781
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    • 2018
  • This paper presents the ballistic armor performance examination and thickness estimation for the latest naval ship structure materials in the Republic of Korea. Up to date, research regarding methods of ballistic experiments establishing database on the latest hull structure materials as well as a precise method of estimating required thickness of armor against specific projectiles have been rarely researched. In order to build a database and estimate proper thicknesses of structure materials, this study used four structure materials that have been widely applied in naval ships such as AH36 steel, AL5083, AL5086, and Fiber Reinforced Plastics (FRP). A $7.62{\times}39mm$ mild steel core bullet normally fired by AK-47 gun was considered as a threat due to its representativeness. Tate and Alekseevskii's penetration algorithm was also used to calculate a correction factor (${\alpha}$) and then estimate the armor thickness of naval ship hull structure materials with a given impact velocity. Through live fire experiments, the proposed method performance difference was measured to be 0.6% in AH36, 0.4% in AL5083, 0.0% in AL5086, and 8.0% in FRP compared with the experiment results.

Performance Analysis of Tactical Ballistic Missile Tracking Filters in Phased Array Multi-Function Radar (위상 배열 다기능 레이더의 탄도탄 추적 필터 성능 분석)

  • Jung, Kwang-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.8
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    • pp.995-1001
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    • 2012
  • This paper compares the performance of several tracking filters, namely, alpha-beta filter, Kalman filter and TBM tracking filter for ballistic target tracking problem using multi-function radar. Every of three tracking filters suggested was tested on simulator developed in accordance with TBM trajectory and MFR RSP measurement. The result shows the method using TBM tracking filter gives 75.3 % decreased velocity RMS error than alpha-beta filter. After initialization, the RMS error of range and velocity of the proposed filter is also smaller than the Kalman filter. Finally the proposed filter is suitable for high-speed TBM tracking due to the stable angle tracking accuracy.

A Study on Radar Received Power based on Target Observing Position (표적 관측 위치에 따른 레이더 수신 전력에 관한 연구)

  • Park, Tae-Yong;Lee, Yura
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.12
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    • pp.3063-3068
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    • 2014
  • Since the RCS(Radar Cross Section) of target is important factor to determine radar performance, it is important to locate radar where large RCS is observed. However, the distance between the target and the radar is an important factor of the received power, as well as RCS. In this paper, it is calculated that received power from ballistic missile to radar based on different observed position and it is studied that to place radar for high detection efficiency.

Efficient Recognition Method for Ballistic Warheads by the Fusion of Feature Vectors Based on Flight Phase (비행 단계별 특성벡터 융합을 통한 효과적인 탄두 식별방법)

  • Choi, In-Oh;Kim, Si-Ho;Jung, Joo-Ho;Kim, Kyung-Tae;Park, Sang-Hong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.30 no.6
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    • pp.487-497
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    • 2019
  • It is very difficult to detect ballistic missiles because of small cross-sections of the radar and the high maneuverability of the missiles. In addition, it is very difficult to recognize and intercept warheads because of the existence of debris and decoy with similar motion parameters in each flight phase. Therefore, feature vectors based on the maneuver, the micro-motion according to flight phase are needed, and the two types of features must be fused for the efficient recognition of ballistic warhead regardless of the flight phase. In this paper, we introduce feature vectors appropriate for each flight phase and an effective method to fuse them at the feature vector-level and classifier-level. According to the classification simulations using the radar signals predicted by the CAD models, the closer the warhead was to the final destination, the more improved was the classification performance. This was achieved by the classifier-level fusion, regardless of the flight phase in a noisy environment.

A Study on the Damage Design of Military Aircraft Structure Material by Armor Piercing Bullet Hit (철갑탄 피격에 의한 군용 항공기 구조재료의 손상설계에 관한 연구)

  • Hur, Jang-Wook;Hyun, Young-Jin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.6
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    • pp.1051-1057
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    • 2010
  • Database for the damage reference by armor piercing bullet test was established for both tube and plate specimens having a range of thickness. As the inclined angles of hit are increasing, it has been found that penetration damage diameter tends to increases accordingly in both specimen of the tube and plate, and such penetration damage diameter on the rear side becomes bigger than those on the front side. The tube specimen showed that the damage becomes bigger when central areas rather than the peripheral were hit. Through the plate test, it also has been found that the penetration ballistic limit for Al alloy is about 25.4mm and that of stainless steel about 12.7mm. From the fatigue analysis results using the database for damage reference, it has been identified whether the safety requirements of military aircraft could be met.

A new method to estimate the striking velocity for small caliber projectiles (소구경 탄자의 충돌속도 추정방법 제안)

  • Yoo, Sangjun;Kim, Jeyong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1288-1293
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    • 2014
  • This paper proposes a new method to estimate the striking velocity for ballistic limit velocity in MIL-STD-662F. The method from MIL-STD-662F needs relative air density, drag coefficient, form factor, ballistic coefficient for estimating striking velocity. So precedent studies are essential. However, the new method can estimate striking velocity only using measured velocities and distance between the screen and the target. To prove new method, we compared estimation of striking velocity from both the new method and the method from MIL-STD-662F on the basis of datain PRODAS. The new method shows bigger errors in some velocity ranges. But it could still calculate ballistic limit velocity. It also shows smaller errors in most velocity ranges.

Internal Ballistic Analysis of Solid Propellant Micro-Thruster (초소형 고체 추진제 추력기의 내탄도 성능연구)

  • Yang, June-Seo;Lee, Jong-Kwang;Kwon, Se-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.215-218
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    • 2007
  • Internal Ballistic modeling and performance prediction for solid propellant micro thruster was performed with heat loss to the chamber wall as an important factor of miniaturization. Simple l-D end-burner type thruster and general HTPB-AP type composite propellant were selected for computation model. The results showed that the performance loss with the heat loss to the surroundings becomes larger as the surface-to-volume ratio is increased. In this case, the total impulse was reduced about 3% of the case in adiabatic condition.

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A Study on the Pressure-travel Curve of 5.56mm Rifle Obtained from the Empirical Base Pressure Factor (탄저압력계수를 이용한 5.56mm 소총의 압력-이동거리 곡선 산출)

  • Lee, Sang-Kil;Lee, Gang-Young
    • Journal of the Korea Institute of Military Science and Technology
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    • v.10 no.3
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    • pp.208-216
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    • 2007
  • As the propellant mass is being accelerated out of the gun chamber along with the projectile, a continuous pressure gradient exists between the end of chamber and the base of the projectile. For this reason, the base pressure-travel curve is very important to design a conventional gun barrel in the interior ballistics, but it is not obtained briefly by empirical or theoretical method. In this paper, a simple relation between chamber pressure and base pressure was determined by the factor of base pressure(Cb) obtained from the experimental method. The simple relation gives a reasonable prediction for the reduction of pressure between the breech and the base of projectile owing to the axial gradient in the gun tube. The predictions have been validated by the infrared screen sensor and the PRODAS(PROjectile Design and Analysis System) for interior ballistic systems. Therefore, the base pressure-travel curve could be calculated from the chamber pressure measured by piezoelectric sensor. The base pressure-travel curve obtained from the simple relation offers initial information to gun barrel designer and is used for calculation of muzzle velocity.