• Defense and Technology
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• no.6 s.172
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• pp.44-51
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• 1993

전술 미사일은 전파 혹은 적외선을 사용해 목표를 탐지하고 미사일을 유도하는 호밍유도방식이 주류를 이루고 있으나, 앞으로 미사일 기술의 발전을 위해서는 센서부의 고감도, 고기능화, 방해배제능력의 향상에 주력해야 합니다 또한 급속도로 발전해 가는 직접회로 기술과 디지털 신호 처리기술을 접목시켜 센서로부터 얻어지는 신호의 고도처리와 미사일의 운동제어에 응용함으로써 운용형태와 환경변화에 유연하게 대응해야 합니다. 이와함께 미사일 개발에서 소프트웨어의 개발중요성이 더욱 제고되어야 합니다

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.11
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• pp.1364-1370
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• 2019

Tilt sensors are mainly used to measure the collapse of structures such as buildings, bridges and tunnels. Recently, due to the ease of use and low price, many tilt sensors using MEMS sensors have been used, but the measurement angle range is limited, and thus, they do not have high precision for 360 degree. This is due to the inherent offset and scale errors of MEMS sensors. In this paper, we proposed an algorithm for the calculation of precision angles to reduce the mechanical error of MEMS sensors, and produced a MEMS sensor module and a transmission module to compare the angle accuracy of sensor modules before calibration and the angle measurement accuracy after calibration. Experimental results show that the proposed technique has a precision of ± 0.015 degrees for all 360-degree.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.10
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• pp.164-170
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• 2014

A single near-field sounde source bearing and ranging method based on a independent doublet array is proposed. In the common case of bearing estimation method, unform linear array or uniform circular array are used. It is constrained retaining aperture because of array structure to estimate the distance of the sound source. Recent using independent doublet array sound source's bearing and distance esmtimation method is proposed by wide aperture. It is limited to the case doublets are located on a straight line. In this paper, we generalize the case and estimate the localization of a sound source in the various array structure. The proposed algorithm was verified performance through simulation.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.161-164
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• 1999

본 논문에서는 표적 추적 시스템에서 센서 어레이에 입사되는 표적신호에 대한 센서 출력 신호간의 지연시간 추정(TDE:Time Delay Estimation)을 위해 백색상호 상관법(CSP:Cross-Power Spectrum Phase Analysis)을 이용한다. 그러나 음파의 다중경로 전달특성 및 배경잡음의 영향으로 인해 CSP계수는 많은 클러터(Clutter)를 포함하게 되고 결국 방위 추정 오차의 요인이 된다. 따라서 센서 어레이 중심좌표를 기준으로 대칭 배열된 센서쌍(Pair)에 대한 CSP계수를 동기가산 하여 실제 표적 방향 이외의 방향정보를 제거하는 방법을 제안한다. 시간에 따라 각도를 변침하는 표적에 대한 표적기동분석 (BOTMA:Bearings Only Target Motion Analysis)을 위해 매 관측시간마다 동기가산을 행한 CSP결과를 누적하여 방위각 궤적을 형성하였을 때 시간 Window에 따라 약간의 차이는 있지만 약 10dB의 궤적 추적 성능을 확인하였다.

• The Journal of the Acoustical Society of Korea
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• v.26 no.4
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• pp.166-172
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• 2007

In this paper, we address the target positioning performance of Multi-Static sonar with respect to target positioning method and measurement error. Based on the analysis on two candidate solution approaches, namely, Least Square (LS) using range and angular information simultaneously and Maximum Likelihood (ML) using only range information as the existing information fusion methods for possible application to Multi-Static sonar, we propose to employ ML using range and angular information. Assuming that each sensor can receive range and angular information, we conduct representative comparison experiments over the existing and proposed methods under various measurement noise scenarios. We also investigate the target positioning performance according to number of sensors, distance between transmitter and receiver. According to the experimental results, RMSE of the proposed ML with distance and direction information is found to be more superior to ML using distance alone and to LS in case distance between transmitter and receiver is longer and number of receiver is smaller.

• The Journal of the Acoustical Society of Korea
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• v.22 no.6
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• pp.482-488
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• 2003

Line may receiver contains an ambiguity on conjugate bearings, because of lacking aperture in transverse direction. To solve the left/right bearing ambiguity of line-array receiver we used line-array with cardioid beam. In addition, the synthetic aperture method adopts coherent processing of sub-aperture signals at successive time intervals in the beam domain. We presented performances about division of left/right bearing ambiguity according to array synthetic number of times in this paper.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.49 no.2
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• pp.130-136
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• 2012

In this paper, we propose a near-field range estimation method for a uniform linear array that can calibrate bearing estimation error which give a bad influence on a range estimation process. When a range is fixed, the bearing error is calibrated to maximize the beamformer output by the proposed algorithm based on the gradient method. Simulation results show that the proposed algorithm can compensate the bearing error which is less than the mainlobe beamwidth so that reduce the range estimation error as similar as the case of no bearing error.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.505-506
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• 2023

본 논문은 임베디드시스템을 적용한 대용량 고부하 레이다 플랫폼의 구동 제어 방안을 제안한다. 군사적 방어 목적용 지대공 유도 미사일 시스템의 구성품인 다기능 레이다 시스템은 고중량의 안테나를 구동해야하는 대용량 고부하 레이다 구동 플랫폼이 필수이다. 이 다기능 레이다 시스템은 360도 방위각 전방향을 일정한 속도로 방위각 회전하며 감시정찰 및 방어 임무를 수행한다. 여기서 대부하 레이다 구동 플랫폼은 방위각회전 구동장치를 이용하여 일정한 속도로 360도 방위각 방향으로 안정적인 회전을 가능하도록 구동 제어한다. 본 구동 제어를 실시간으로 구현하기 위해 임베디드시스템인 DSP(Digital Signal Processor)가 포함된 제어모듈은 구동모듈에 회전구동 명령을 인가하여 일정한 회전각속도로 구동하도록 회전구동 모터를 실시간 제어한다. 고부하 레이다 플랫폼은 직구동모터타입의 회전구동모터, 회전체에 신호와 전원을 공급하기 위한 회전슬립링, 회전체의 회전각도를 측정하기 위한 회전센서로 구성된 방위각회전구동장치와 전체 전원을 공급받아 사용 목적에 맞게 변환하여 공급하는 전원모듈, 구동모터에 구동전원을 공급하기 위한 구동모듈, 회전구동 명령에 따라 구동제어하기 위한 제어모듈로 구성된 제어장치로 구분된다. 본 논문에서는 대부하 레이다 구동 플랫폼을 시뮬레이션 모델링으로 구현하고 제안하는 구동 제어 방안은 구동제어시뮬레이션으로 검증한다.

• Korean Journal of Remote Sensing
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• v.36 no.3
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• pp.441-448
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• 2020

GMTI (Ground Moving Target Indication) radar system can detect ground moving targets and can provide position and velocity information of each target. However, the azimuth position of target has some offset because of the hardware errors such as mechanical tolerances. In this case, an error occurs no matter how accurate the monopulse ratio is. In this paper, target position correction method in azimuth direction has been proposed. The received sum and difference signals of monopulse GMTI system are post-processed to correct the target azimuth angle error. This method is simple and adaptive for nonhomogeneous area because it can be implemented by using only software without any hardware modification or addition.

• Journal of Advanced Navigation Technology
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• v.16 no.5
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• pp.738-743
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• 2012

Kalman filter is generally used in INS/GPS integrated navigation filter. However, the INS with low performance inertia sensor can not find accurate azimuth in initial alignment stage because sensor noise level is too large compare to Earth rotation rate, therefore the performance and stability of Kalman filter can not be guaranteed. In this paper, the extended Kalman filter and particle filter combined filter structure which can be overcome large initial azimuth error is proposed.