• Title, Summary, Keyword: Missile Recognition

Search Result 11, Processing Time 0.034 seconds

Effect of Evasive Maneuver Against Air to Air Infrared Missile on Survivability of Aircraft (공대공 적외선 위협에 대한 회피기동이 항공기 생존성에 미치는 영향)

  • Bae, Ji-Yeul;Bae, Hyung Mo;Kim, Jihyuk;Jung, Dae Yoon;Cho, Hyung Hee
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.30 no.6
    • /
    • pp.501-506
    • /
    • 2017
  • An infrared seeking missile does not emit any signal by itself as it is guided by passive heat signature from an aircraft. Therefore, it is difficult for the target aircraft to notice the existence of incoming missile, making it a serious threat. The usage of MAW(missile approach warning) that can notify the approaching infrared seeking missile is currently limited due to its high cost. Furthermore, effectiveness of MAW against infrared seeking missile is not available in open literature. Therefore, effect of evasive maneuver by MAW on the survivability of the aircraft is simulated to evaluate the benefit of the MAW in this research. The lethal range is used as a measure of aircraft survivability. An aircraft flying at an altitude of 5km with Mach 0.9 being tracked by air-launched AIM-9 infrared seeking missile is considered in this research. As a variable for the evasive maneuver, the MAW recognition distance of 5~7km and the G-force of 3~7G that limits maximum directional change of the aircraft are considered. Simulation results showed that the recognition of incoming missile by MAW and following evasive maneuver can reduce the lethal range considerably. Maximum reduction in lethal range is found to be 29.4%. Also, the MAW recognition distance have a greater importance than the aircraft maneuverability that is limited by structural limit of the aircraft.

A Study on Signal Processing of Ballistic Missile Warhead Discrimination Using ESPRIT in Millimeter-Wave(Ka-Band) Seeker (밀리미터파 탐색기에서 ESPRIT 기법을 이용한 탄도 미사일 탄두 식별 신호처리 기법 개발)

  • Choi, Gak-Gyu;Han, Seung-Ku;Jo, Hee-Jin;Kim, Hyo-Tae;Kim, Kyung-Tae;Song, Sung-Chan;Na, Young-Jin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.23 no.2
    • /
    • pp.266-269
    • /
    • 2012
  • This paper introduces a signal processing technique for discrimination of ballistic missile's warhead. An interceptor missile to destroy the enemy's ballistic missile requires an information on the location of missile's warhead. In order to detect and locate the missile's warhead, a seeker radar in the interceptor missile makes use of chirp waveform to generate high resolution range profiles(HRRPs). We applied one of the well known spectral estimation technique called ESPRIT (Estimation of Signal Parameters by Rotational Invariance Technique) to these HRRPs to estimate scattering centers on the target. Using the information on the one-dimensional(1-D) scattering centers, we can find the location of the warhead by estimating the length of the missile, Simulation results show that the proposed signal processing technique is efficient in discriminating the warhead of an ballistic missile.

A Study on Signal Processing of the Length Estimation of Missile Target Using RELAX (RELAX 기법을 이용한 미사일의 길이 추정 신호 처리 기법 연구)

  • Jo, Hee-Jin;Choi, Gak-Gyu;Han, Seung-Ku;Kim, Kyung-Tae;Song, Sung-Chan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.24 no.3
    • /
    • pp.292-298
    • /
    • 2013
  • A signal processing technique is introduced in this paper in order to estimate the lengths of missile targets. To measure the length of a target, it is necessary to know the information on the target's location and aspect angle. Chirp waveforms and stretch processing are used to estimate the location and angle of a missile as well as HRRP(High Resolution Range Profile). RELAX(relaxation) algorithm, which is one of the spectral estimation techniques, were used to find scattering centers of a missile from HRRP. From the information on the distribution of one-dimensional(1-D) scattering centers on a target, we can discriminate the length of a missile.

An Efficient Method to Extract the Micro-Motion Parameter of the Missile Using the Time-Frequency Image (시간-주파수 영상을 이용한 효과적인 미사일 미세운동 변수 추출 방법)

  • Choi, In-O;Kim, Si-Ho;Jung, Joo-Ho;Kim, Kyung-Tae;Park, Sang-Hong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.27 no.6
    • /
    • pp.557-565
    • /
    • 2016
  • It is very difficult to intercept the missiles because of the small radar cross-section and the high maneuverability. In addition, due to the decoy with the similar motion parameters, additional features other than those of the translation motion parameters need to be developed. In this paper, for the successful recognition of missiles, we propose an efficient method to extract micro-motion parameters and scatterers of the missile engaged in the micro motion. The proposed method extracts motion parameters and scatterers by using the matching score between the modeled micro-Doppler function and the time-frequency binary image as a cost function. Simulation results using a target composed of the point scatterer show the parameters and the scatterers were accurately extracted.

A Study on Improvement of Launch Performance for Precision Guided Missile by Live-fire test results (사격시험 결과에 따른 정밀 유도무기 발사성능 개선에 관한 연구)

  • Seo, Bo-Gil;Choi, Nak-Sun;Yoon, Young Ho
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.9
    • /
    • pp.488-494
    • /
    • 2019
  • Precision Guided Missiles after production and militarization have various characteristics that enable the final performance to be identified by conducting live-fire tests after long-term storage. Likewise, the performance and reliability of ${\bigcirc}{\bigcirc}$ Missiles, which are currently used by the Korean Navy, are also verified consistently by conducting live-fire tests after militarization. Specially, the live fire test at '00 year, which was conducted by Korean Navy, showed the result that 'Ring', which is a component of the canister's front cover, was jammed with wings for propulsion and then broke away from the canister during the missile launch process. This situation led to an interruption of the deployment of wings and finally affected the missile's flight performance. The results of a survey of the canisters of those missiles whose live fire tests were conducted successfully, based on the live fire test at '00 year, showed the 'Ring's separation from canisters. This raises recognition for the need to solve the problems of 'Ring's separation and breakaway. This study suggests an improvement derived by the result of live-fire tests and introduces the effect of final launch performance of ${\bigcirc}{\bigcirc}$ Missiles and test result after applying the improvement.

Extended Target State Vector Estimation using AKF (적응형 칼만 필터를 이용한 확장 표적의 상태벡터 추정 기법)

  • Cho, Doo-Hyun;Choi, Han-Lim;Lee, Jin-Ik;Jeong, Ki-Hwan;Go, Il-Seok
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.43 no.6
    • /
    • pp.507-515
    • /
    • 2015
  • This paper proposes a filtering method for effective state vector estimation of highly maneuvering target. It is needed to hit the point called 'sweet spot' to increase the kill probability in missile interception. In paper, a filtering method estimates the length of a moving target tracked by a frequency modulated continuous wave (FMCW) radar. High resolution range profiles (HRRPs) is generated from the radar echo signal and then it's integrated into proposed filtering method. To simulate the radar measurement which is close to real, the study on the properties of scattering point of the missile-like target has been conducted with ISAR image for different angle. Also, it is hard to track the target efficiently with existing Kalman filters which has fixed measurement noise covariance matrix R. Therefore the proposed method continuously updates the covariance matrix R with sensor measurements and tracks the target. Numerical simulations on the proposed method shows reliable results under reasonable assumptions on the missile interception scenario.

Vascular Injuries Due to Penetrating Missile Trauma in Anti-Terrorism Ops

  • Dhillan, Rishi;Bhalla, Alok;Kumar Jha, Sushil;Singh, Hakam;Arora, Aman
    • Journal of Trauma and Injury
    • /
    • v.32 no.2
    • /
    • pp.93-100
    • /
    • 2019
  • Purpose: Penetrating vascular trauma though less common poses a challenge to all Surgeons. This study was designed to analyse the profile, management modalities of vascular trauma and the outcomes thereof at a Trauma Care Centre in a Tertiary care setting in hostile environment in India. Methods: A prospective review of all patients with arterial and venous injuries being transferred to the Trauma Center at out Tertiary Care Center between June 2015 and May 2018 was done. Demographics, admission data, treatment, and complications were reviewed. Results: There were a total of 46 patients with 65 vascular injuries, 39 arterial injuries and 26 venous injuries. The age range was 21 to 47 years. Nineteen patients had both arterial and venous injuries. A total of 42 cases presented within 12 hours of injury and complete arterial transections were found in 33 cases (80.49%). There were three mortalities (6.52%) and three amputations (8.33%). The overall limb salvage rate was 91.67% with popliteal artery being the commonest injured artery. Poor prognosticators for limb salvage were increasing time to present to the trauma centre, hypovolemic shock, multi-organ trauma and associated venous injuries. Conclusions: Penetrating missile trauma leading to vascular injuries has not been widely reported. Attempting limb salvage even in cases with delayed presentation should be weighed with the threat to life before revascularisation and should preferably be done at a centre with vascular expertise. A team approach with vascular, orthopaedic, general surgeons, and critical care anaesthesiologists all aboard improve the outcomes manifold. Use of tourniquets and early fasciotomies have been emphasized as is the use of native veins as the bypass conduit. This is probably the largest study on penetrating Vascular trauma in anti-terrorism ops from the Indian subcontinent. It highlights the significance of prompt recognition and availability of vascular expertise in optimally managing cases of vascular trauma.

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
    • /
    • v.30 no.6
    • /
    • pp.487-497
    • /
    • 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.

One-Dimensional Radar Scattering Center for Target Recognition of Ground Target in W-Band Millimeter Wave Seeker Considering Missile Flight-Path Scenario (유도탄 조우 시나리오를 고려한 W-대역 밀리미터파 탐색기의 지상 표적 식별을 위한 1차원 산란점 추출에 관한 연구)

  • Park, Sungho;Kim, Jihyun;Woo, Seon-Keol;Kwon, Jun-Beom;Kim, Hong-Rak
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.28 no.12
    • /
    • pp.982-992
    • /
    • 2017
  • In this paper, we introduce a method of selection for the optimal transmission polarization of a W-band seeker through the extraction of the one-dimensional scattering center of a ground tank target. We calculated the surface scattering and edge scattering using the shooting and bouncing ray tracing method of the CST A-solver. Based on 4-channel RCS data, using the one-dimensional RELAX algorithm, which is a kind of spectral estimation technique, scattering centers of ground targets were extracted. According to the changes in the polarization state and look angle, we compared and analyzed the scattering center results. Through simulation, we verified that the scattering center results can be applied when feature vectors are used for target recognition.

Future Direction of ROK Navy's Maritime Strategy based on the Recognition and Expansion of Maritime Sphere (해양공간 인식과 확장의 관점에서 본 한국 해양전략의 발전 방향)

  • Jung, Gwang-Ho
    • Strategy21
    • /
    • /
    • pp.142-176
    • /
    • 2018
  • So far, the main threat to South Korea was North Korea. That is why South Korea established a strategy based on the threat of North Korea and most of the budget on defense was used to deter North Korea. Even though the neighboring countries(China, Japan, and Russia) are growing as a real threat with abilities and intentions based on their powerful naval forces, South Korea has not yet been able to establish a strategy that regards neighboring countries as a threat. But the decades-old structural mechanism of the Korean security environment is undergoing a radical change on April 27, 2018, through the South-North summit and the Panmunjom Declaration. Under the changing security environment, South Korea was placed in a complicated dilemma that had to deal with threats of two axes(China), three axes(China, Japan), and four axes(Japan, Russia). If the one axis threat(North Korea) is dominated by land threats, the second, third and fourth axis threats are threats from the sea. This paper analyzed the maritime strategy of Korea within the framework of maritime-geopolitics, in other words recognition and expansion of the sphere of maritime. I have designed that the maritime defense space that we can deny from threats is divided into three lines of defense: 1 line (radius 3,000km), 2 lines (2,000km), and 3 lines (1,000km). The three defense zones of the three lines were defined as an active defense(1 line), defensive offense(2 line), active offense(3 line). The three defense zones of the three lines were defined as the sphere of core maritime, As a power to deny the sphere of core maritime, it was analyzed as a maneuvering unit, a nuclear-powered submarine, the establishment of missile strategy, and the fortification of islands station. The marine strategy of South Korea with these concepts and means was defined as 'Offensive Maritime Denial Strategy'.