• Title/Summary/Keyword: Pulse Jamming

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Multistage Pulse Jamming Suppression Algorithm for Satellite Navigation Receiver

  • Yang, Xiaobo;Feng, Jining;Xu, Ying
    • Journal of Information Processing Systems
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    • v.18 no.1
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    • pp.89-96
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    • 2022
  • A novel multistage pulse jamming suppression algorithm was proposed to solve the anti-pulse jamming problem encountered in navigation receivers. Based on the characteristics of the short duration of pulse jamming and distribution characteristics of satellite signals, the pulse jamming detection threshold was derived. From the experiments, it was found that the randomness of pulse jamming affects jamming suppression. On this basis, the principle of the multistage anti-pulse jamming algorithm was established. The effectiveness of the anti-jamming algorithm was verified through experiments. The characteristics of the algorithm include simple determination of jamming detection threshold, easy programming, and complete suppression of pulse jamming.

A Time-Sharing TX/RX Control Technique for the Rejection of Feedback Noise Jamming Interference (피드백 잡음재밍 간섭제거를 위할 시분할 송수신 제어기법)

  • Jeong Un-Seob;Ra Sung-Woong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.12C
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    • pp.1201-1207
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    • 2005
  • When the isolation between transmitter and receiver in Electronic Warfare equipment is not sufficient, the radiated noise jamming signal from the transmitter feeds back into the receiver and interferes with receiving radar pulse signal. Therefore pulse jamming and noise jamming can't be performed together in the same frequency bands. In this paper, we present a time-sharing TX/RX control technique of the switch matrix which inhibits the transmission of noise jamming signal by using the predicted gate of pulse train and also makes the corresponding channel filter operate to receive the radar pulse signal during the predicted gate pulse. This technique was implemented by EPLD and confirmed by experiment. The proposed technique enables the pulse jamming and the noise jamming to be simultaneously executed in multiple jamming environments.

Jamming Effect of Phase-Coded Pulse Compression Radar (위상코드 펄스압축 레이더의 재밍 효과)

  • Lim, Joong-Soo
    • Journal of Convergence for Information Technology
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    • v.9 no.5
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    • pp.125-129
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    • 2019
  • This paper describes the jamming effect of phase-coded pulse compression(PCPC) radar. Barker code radar, a typical PCPC radar, separates transmission pulses into 13 or 31 small pulses and phase modulates and transmits each pulse signal to increase radar detection efficiency and reduce the influence of jamming. Generally, when the radar is subjected to jamming, the detection distance becomes shorter and the detection error rate becomes higher. In the case of noise jamming or carrier jamming on the PCPC radar, the jamming effect is very small for no phase-coded convergence. However, the jamming effect is large in the case of synchronous jamming using the pulse-coded signal as a jamming signal with DRFM. It can be seen that the jamming effect increases when the storage time of the pulse-coded signal is prolonged. This study is considered to be useful for PCPC radar and EW jamming system design.

Anti-jamming Performance Analysis of Link-16 Waveform (Link-16 웨이브폼 항재밍 성능 분석)

  • Noh, Hong-Jun;Kim, Jung-Bin;Lim, Jae-Sung;Nam, Jeong-Ho;Jang, Dhong-Woon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.12A
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    • pp.1105-1112
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    • 2010
  • Link-16 is a up-to-date tactical data link used in the armed forces of U.S. and NATO. In order to guarantee the required capabilities of anti-jamming and low probability of detection, Link-16 uses the techniques of frequency hopping and spreading code etc. In this paper, under Nakagami fading channels, we ananlyze the symbol error rates (SERs) of JTIDS/Link-16-type waveform based on both the single- and double-pulse schemes by considering the partial band noise jamming and the pulse jamming models, respectively.

Design and Response Analysis of Wideband Monopulse Radar System Robust to Noise Jamming Signal (잡음 재밍 신호에 강인한 광대역 모노펄스 레이더 시스템 설계 및 응답 특성 분석)

  • Shin, Bohun;Yang, Haejoon;Kim, Changyeol;Park, Soryoung;Noh, Sanguk;Nam, Ilku
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.1
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    • pp.94-102
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    • 2018
  • In this paper, the wideband mono-pulse radar using AGC and limiter is designed. The output response characteristics of the mono-pulse radar using AGC and limiter are analyzed, respectively. In addition, the output response for jamming input signals is analyzed. The range tracking loop in the mono-pulse radar has robust output response to the noise jamming input signal. Although the output settling response of the AGC-based mono-pulse radar is larger than that of the limiter-based mono-pulse radar, the AGC-based mono-pulse radar has robustness to the noise jamming input signal due to feedback loop.

A Study on Evaluation of Jamming Performance on SAR Satellite (SAR 위성에 대한 재밍 효과 분석)

  • Lee, Young-Joong;Kim, In-Seon;Park, Joo-Rae;Kwak, Hyun-Kyu;Shin, Wook-Hyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.2
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    • pp.252-257
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    • 2010
  • SAR has pulse compression gain through the process including range and azimuth. Efficient jammers against the SAR with simulated elements are evaluated in the view of power and SAR image. In this paper, J/S is analysed for SAR with RF propagation equation firstly. Several jamming signals on SAR signal are made into SAR image through pulse compression process. Objective jamming performance is evaluated using euclidean distance.

A Study on Performance Analysis of IEEE 802.15.4b Noncoherent Receivers at 915MHz under Pulse Jamming (Pulse Jamming 환경 하에서 IEEE 802.15.4b 915MHz 비동기식 수신기 성능 분석에 대한 연구)

  • Lee, Sung-Yong;Cheong, Cha-Keon
    • Proceedings of the IEEK Conference
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    • 2009.05a
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    • pp.296-298
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    • 2009
  • In this paper, we are performance analysis of IEEE 802.15.4b LR-WAPN(Low-Rate Wireless Personal Area Network; Zigbee) system noncoherent receivers at 915MHz under Jamming. IEEE 802.15.4b concerns itself with devices at 915MHz, which employ a higher data rate of up to 250 kbps, and which use O-QPSK(Offset Quradrature Phase Shift Keying modulation with DSSS(Direct Sequence Spread Spectrum). Communication between devices can still be hampered by the presence of interferers outside the network, whether the interference be intentional or not. Hence the receivers can not have stable receiving condition due to worse BER. To solve this problem, we present a mere stabilized receiver system of using noncoherent detection. In this paper, we look instead at the effect of jamming, i.e. intentional interference, on the BER performance of IEEE 802.15.4 devices.

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Adaptive Decoding Scheme of Concatenated Codes for Frequency-Hopped Spread-Spectrum Communications with a Pulse-Burst Jamming (펄스형 Jamming 신호가 존재하는 주파수 도약 대역확산 통신환경에서 쇄상부호 시스템의 적응 복호화 방식)

  • 김정곤;김성대;김형명
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.7
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    • pp.1234-1243
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    • 1994
  • We propose an adaptive decoding scheme for a concatenated codes with frequency-hopped spread-spectrum communication system in the presence of a pulse-burst jammer and its performance is analyzed. Concatenated coding system employing binary inner code and Reed-Solomon outer code is investigated and the use of side information is allowed to decode both erasures and errors. Our scheme makes the decoder adapts to the level of jamming by switching between two decoding modes such that the overall block error probability can be reduced. It is shown that the proposed decoding scheme yields a significant performance improvement over a conventional decoding scheme.

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Monitoring of the Jamming Environment in the GNSS L5 Band in Korea Region

  • Lee, Hak-beom;Song, Young-Jin;Park, Dong-Hyuk;Lee, Sanguk;Won, Jong-Hoon
    • Journal of Positioning, Navigation, and Timing
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    • v.10 no.4
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    • pp.353-361
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    • 2021
  • This paper presents the jamming effect on the L5 band of Global Navigation Satellite System (GNSS) by analyzing real data collected via measurement campaigns in Korea region. In fact, the L5 band is one of the dedicated bands for various satellite navigation systems such as Global Positioning System (GPS), Galileo, BeiDou (BDS), and Quasi Zenith Satellite System (QZSS). And this band is also allocated along with various systems used for aeronautical radio navigation systems (ARNS). Among ARNS, the Distance Measuring Equipment (DME) and the Tactical Air Navigation System (TACAN) are systems that transmit and receive strong power pulse signals, which may cause unintentional jamming in the reception of GNSS signals. In this paper, signals in the main lobe of GPS L5, Galileo E5a, BDS B2a, and QZSS L5 are collected in Korean region to confirm whether the jamming effect exists in the band. And then, the pulse blanking technique, which is a simple signal processing technique capable of responding to pulsed jamming, is applied to analyze the jamming effect of DME/TACAN on the L5 band.

Modeling Jamming Avoidance Response of Pulse-type Weakly Electric Fish (전기물고기의 방해 회피 반응 모델링과 응용)

  • Soh, JaeHyun;Kim, DaeEun
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.10
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    • pp.924-929
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    • 2015
  • In this paper, we suggest a phase difference algorithm inspired by weakly electric fish. Weakly electric fish is a fish which generates electric field though its electric organ in the tail. The weakly electric fish search for prey and detect an object by using electrolocation. The weakly electric fish have Jamming Avoidance Response (JAR) to avoid jamming signal. One of pulse-type weakly electric fish Gymnotus carapo also have JAR to reduce the probability of coincidence of pulses. We analyze this response signal and design the phase difference algorithm. We expect that simple algorithm inspired by weakly electric fish can be used in many engineering fields.