A Study on the optimal design of MOSCOS arrangement to solve the EMI between EWT and MOSCOS

전자전훈련지원체계와 해상작전위성통신체계 간 전자기 간섭 개선을 위한 최적배치에 대한 연구

Abstract

The optimum solutions of MOSCOS antenna arrangement were studied to solve the EMI between it and EWT mounted on an MTB. Two candidates of optimal place for MOSCOS antenna were determined by using a fishbone diagram to determine seven reasons based on 4M1E, to identify the design factors on Friis equations, and to analyze the case study of EMI related to MOSCOS. MOSCOS antenna was rearranged by the final optimal position, which was selected by measuring the Power Spectral Density (PSD) at two locations, and the proposed improvement was tested on board to determine its efficiency.

다목적훈련지원정(MTB)에 탑재되는 전자전훈련지원체계(EWT) 송신 신호에 의해 MOSCOS 간 전자기간섭 문제점을 해결하기 위한 안테나 최적 위치에 대한 연구를 수행하였다. 이를 위해 4M1E에 근거한 Fishbone Diagram을 이용하여 7가지의 원인을 식별하였으며 Friis 전달공식을 통해 고려해야 할 요소를 식별하고 기존 함정에서 발생한 유사 문제점을 분석한 후, 두 개의 최적 배치 후보를 선정하였다. 두 개의 설치 위치에 대해 전자기 수신 레벨을 측정하여 최적배치(안)을 수립한 후, 본 개선사항에 대한 실선 시험을 통해 전자기 간섭 개선 효과를 확인하였다.

Fig. 1. MOSCOS configuration

Fig. 2. EWT Operating Concept

Fig. 3. EMC determination flow diagram

Fig. 4. Fishbone diagram of EMI

Fig. 5. MOSCOS and EWT Antenna Placement

Fig. 6. MOSCOS wave propagation model

Fig. 7. EMI Characteristics on E1D mode

Fig. 8. Top view of MOSCOS and EWT

Fig. 9. The location of E-field for MOSCOS

Fig. 10. The PSD of left-sided ANT. locationon E1C and E1D mode

Fig. 11. The PSD of right-sided ANT. locationon E1C and E1D mode

Fig. 12. Improvement of MOSCOS location

Fig. 13. The final improvement of MOSCOS

Table 1. MOSCOS Specification

Table 2. The candidates for optimal solution

Table 3. The improvement of two candidates

Table 4. The evaluation results of three candidates

Table 5. The test results after improvement