• Title/Summary/Keyword: FM Radio Set

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Design Conformance Verification of Military FM Radio Set Automatic Test Equipment (군용 FM 무전기 세트 자동시험장비(ATE) 설계 적합성 검증)

  • Kim, Byung-Jun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.3
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    • pp.389-396
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    • 2020
  • In order to obtain a good quality product, a proper verification of production/test facilities must be preceded before the quality conformity inspection of the product. Among the various production/test facilities, ATE is widely used in the civilian industry such as the automotive industry, aerospace industry, semiconductor industry today. In addition, ATE is actively used in the defense industry production and performance tests. This paper is the result of systematically verifying the Design Conformance of ATS which is ATE of military FM radio set using various methods. And It is expected to be a good reference at the present time when the design conformity verification procedure for ATE for military supplies is not documented.

Analysis of Deception Jamming Effects on FM Radio based Passive Radar (FM 라디오 기반 수동형 레이다 기만재밍 효과 분석)

  • Song, Kyuha;Kwak, Hyungyu;Kim, Sanhae;Jeong, Inhwan;Lee, Jonghwan;Lee, Byeongnam
    • Journal of the Korea Institute of Military Science and Technology
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    • v.25 no.3
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    • pp.239-250
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    • 2022
  • In this paper, we analyze the performance of an FM radio based passive radar in the presence of deception jamming such as false-target generation. To do this, we examine the effects of applying the deception jamming signal to the passive radar through the derivation of the construction of the amplitude-range-Doppler(ARD) plot. The analysis results show that applying the deception jamming signal with the low power similar to the target echo signal generates false targets at positions set by the jamming variables compared to the real target position in the ARD plot. Also, it is possible to induce the jamming effect so that only false targets are detected by selecting appropriate jamming power. Simulations are included to verify the theoretical results and to discuss on the effectiveness of the deception jamming on the FM radio based passive radar.

A Study on Interference Analysis between FM Broadcasting Service and ILS Localizer (FM 방송서비스와 ILS localizer사이의 간섭분석에 관한 연구)

  • Kim, Jin-Young;Kim, Eun-Cheol;Yang, Jae-Soo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.3
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    • pp.7-18
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    • 2008
  • Radio systems decline in the system performances when one system is interfered from the other system. System parameters, which are operating frequency, transmit power, and so on, need to be determined in order that there is no interference between radio systems. We investigate the interference from the sound broadcasting service in the band 87.5-108 MHz to the ILS localizer, one of the aeronautical services, in the band of 108-112 MHz. The results are compared with the interference criteria. And then several system parameters, which are frequency, transmit power, and location, are determined in order to avoid the interference from the FM sound broadcasting service which occupies the frequency band near the band of the aeronautical services. The results of this paper can be applied to set up system parameters of the ILS localizer so that system performance can be maximized. Besides, the result of this paper can be applied for determining spectrum management policy.

A Study on Voice Communication Quality Improvement of Intercom System for KUH (한국형 기동헬기 내부통화장치의 통화품질 향상에 관한 연구)

  • Kim, Young Mok;Chang, Joong Jin;Jun, Byung Kyu;Kim, Chang Young;Jeong, Jin Woong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.12
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    • pp.1002-1010
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    • 2013
  • Intercom System(ICS) of Korean Utility Helicopter(KUH) is an essential equipment for pilot to perform flight mission and it consists of communication system of KUH with VHF-FM radio set and U/VHF-AM radio set. It provides pilots and crews with internal communication, external communication and audible alarm. It has function of controlling volume and selecting two communication modes, normal mode and backup mode. This paper summarizes pilot comments in flight test which are classified by cause of occurrence and the troubleshooting process about each comment. It also describes design improvements which was derived from troubleshooting and suggests verification results of flight test.

Development of New Radar Beacon

  • Hayashi, Shogo;Sato, Tatsuo;Tanaka, Senji;Suzuki, Tsutomu
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.1
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    • pp.291-296
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    • 2006
  • The restrictions concerning the use of the radio waves have become severe, the marine radar with low spurious is being developed. Therefore, it is necessary to develop aids to navigation as a radar beacon can respond to new type of marine radar. Because the system of radar in the future is an indetermination, new radar beacon should correspond to old and new radar system during a transition period. New radar beacon that is also able to respond to pulse radar, pulse compression radar and FM-CW radar were considered in these years in Japan. The sign of the response of Morse code in a new system is generated by the delay synthesis system. Computer simulation and actual examination using trial circuit were curried out. A big possibility was set up in the development of the new radar beacon that was able to correspond to old and new radar system. These results and the state of new radar beacon is mentioned in this paper.

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A Study on the 900MHz FDD Tranceiver for the Vessel (900MHz대 FDD방식을 이용한 선내용 Tranceiver에 관한 연구)

  • 송면규;조학현;김정년
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.2 no.3
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    • pp.359-365
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    • 1998
  • The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO & RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather, Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation, and partly modified 900MHz band cordless phone circuit.

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A Study on the 900MHz FDD Tranceiver for the Vessel (900MHz대 FDD 방식을 이용한 선내용 Tranceiver에 관한 연구)

  • 김정년;조학현;송면규;김기문
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 1998.05a
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    • pp.365-370
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    • 1998
  • The portable two way radio telephone amongst GMDSS equipment in the vessel is very important portable wireless one for search and rescue in distress situation. Although the portable two way radio telephone must be equipped with in the vessel by IMO RR, other kinds of wireless tranceivers are widely used to communicate with crew members who are separately appointed at bridge forecastle and poop in leaving or arriving at the port, passing through a narrow canal or voyaging in the foggy weather. Most of those wireless tranceivers except portable two way radio telephone are allocated at 27MHz band with PTT simplex system that makes crew members difficult to work effectively in the vessel. In this research 900MHz band FDD(frequency duplex division) tranceiver system is studied to help crew members in the vessel to communicate with themselves freely and to work easily meanwhile with simple operation. 900MHz band FDD tranceiver system uses one chip FM frontend IC to realize the miniaturization and downsizing of tranceiver and small size head set attached to helmet. The credibility of this research's result is highly evaluated by circuit analysis with computer aided simulation. and partly modified 900MHz band cordless phone circuit.

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The Design of DARC Error Correction Decoder Based on (272,190) Shortened Difference Set Cyclic Code (단축 차집합 순회부호 (272,190)에 기반한 DARC 오류정정 복호기 설계)

  • 심병섭;박형근;김환용
    • Journal of the Korea Computer Industry Society
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    • v.2 no.6
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    • pp.791-802
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    • 2001
  • In this paper, DARC(Data Radio Channel) error correction decoder for the U Subcarrier Broadcasting System is designed of using (272,190)$\times$(272,190) product code based on (272,190) shortened difference set cyclic code. This decoder has error flag of column and row direction that can store the result of the error correction of column and row direction in the block and frame structure, is designed to be of no benefit the output with majority logic determination to cancel the corrected and determined bit, and can improve by using the error correction method that no error correction of the row direction is performed, if error correction of the column direction is completely performed by error flag.

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