Bibliographies thématiques / Pulse blanking

Littérature scientifique sur le sujet « Pulse blanking »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Pulse blanking"

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Murakami, Tomohiro, Ming Yang, Hiroshi Kishi, Sigeki Mori, Masahiro Ohkawa et Eiichi Fujino. « Reducing Blanking Vibration with Active Vibration Control Using a Servo Press ». Key Engineering Materials 716 (octobre 2016) : 510–20. http://dx.doi.org/10.4028/www.scientific.net/kem.716.510.

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Blanking noise and blanking vibration are causes of pollution. At the same time, blanking vibration disturbs the high precision of a press work product, and shortens the life expectancy of the press machine and the press die. Recently, the use of a servo press has been developed to improve these problems, using low speed blanking and pulse vibration banking. However, these methods lengthen the blanking time, so it is necessary to control the servo press properly in the case of blanking. In this study, we describe a principle for the reduction of blanking vibration when using a servo press, and we propose an active vibration control method for the reduction of blanking vibration. We used a crank servo press of 450kN in an experiment, which has a pulse motion of 10Hz. We conducted a simulation and an experiment of blanking using an active vibration control method, which we named “counter pulse blanking.” We confirmed that counter pulse blanking is effective in reducing vibration as a result of the simulation and the experiment.
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Keshkar, Miziya, Raja Muthalagu et Abdul Rajak. « ROAD Statistics-Based Noise Detection for DME Mitigation in LDACS ». Applied Sciences 12, no 8 (8 avril 2022) : 3774. http://dx.doi.org/10.3390/app12083774.

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Interference mitigation in L-band Digital Aeronautic Communication Systems (LDACS) from legacy users is extremely important as any error in data retrieval of aeronautic communication can adversely affect flight safety. This paper proposes an LDACS receiver prototype which uses rank-ordered absolute differences (ROAD) statistics to detect the distance measuring equipment (DME) interference. The detected DME interference is reduced in the next stage by pulse blanking. The performance of the proposed ROAD pulse blanking method (ROAD PB) is compared with the existing interference mitigation methods which use the amplitude of the received signal for the detection of DME interference. In depth analysis of the obtained results affirms that the proposed ROAD value-based interference detection excels amplitude-based detection. For an SNR value of 0 dB, the proposed method of detection could achieve a 3% increase in terms of accuracy with a reduction of 4% in false alarms. With the advantage of ROAD statistics detection, the proposed ROAD PB could achieve an SNR saving of 2.7, 1.1, 0.7, 0.25 and 0.2 dBs at BER 10−1 in comparison with pulse blanking, Genie-aided estimation enhanced pulse peak attenuator (GAEPPA), GAE enhanced pulse peak limiter (GAEPPL), optimum Bayesien estimator enhanced pulse peak attenuator (OBEPPA) and OBE enhanced pulse peak limiter (OBEPPL). The comparative results show that the proposed ROAD pulse blanking outperformed the other techniques for the optimum threshold value of the operation.
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O'Connor, Brian J., H. John Yack et Scott C. White. « Reducing Errors in Kinetic Calculations : improved Synchronization of Video and Ground Reaction Force Records ». Journal of Applied Biomechanics 11, no 2 (mai 1995) : 216–23. http://dx.doi.org/10.1123/jab.11.2.216.

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A strategy is presented for temporally aligning ground reaction force and kinematic data. Alignment of these data requires marking both the force and video records at a common event. The strategy uses the information content of the video signal, which is A/D converted along with the ground reaction force analog signals, to accomplish this alignment in time. The vertical blanking pulses in the video signal, which define the start of each video field, can be readily identified, provided the correct A/D sampling rate is selected. Knowledge of the position of these vertical blanking pulses relative to the synchronization pulse makes it possible to precisely align the video and analog data in time. Choosing an A/D sampling rate of 598 Hz would enable video and analog data to be synchronized to within 1/1,196 s. Minimizing temporal alignment error results in greater accuracy and .reliability in calculations used to determine joint kinetics.
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Bostanjoglo, O., F. Heinricht et F. Wünsch. « Performance of A Laser-Pulsed Thermal Electron Gun ». Proceedings, annual meeting, Electron Microscopy Society of America 48, no 1 (12 août 1990) : 124–25. http://dx.doi.org/10.1017/s0424820100179373.

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High-speed electron microscopy strongly demands a high-brightness electron gun in order to increase the number of image forming electrons. A few years ago, a laser-pulsed high-brightness electron gun was introduced. Fig.1 shows the experimental set-up, A standard triode system was supplemented with a Nd:YAG laser, focussing optics and a modified anode, which incorporates the laser deflection mirror. The frequency doubled laser pulse (τ =5 ns, λ = 532 nm) is focused through a window onto the tip of the tungsten hairpin emitter. The laser treated area (≈ 100 μm diameter) is heated well above the melting point, which results in a strong thermal electron emission. Due to rapid heat-up and fast cool-down of the tungsten surface short electron pulses with a duration of 20 ns and a maximum current of 20 mA at 80 kV are emitted. A destruction of the tungsten wire is avoided, too. Laser energies used for the generation of electron pulses are in the range of 100 μJ. Due to these minor modification, the DC operation of the electron gun is not disabled, which allows a convenient adjustment in the DC mode and then switching into the pulsed operation mode. Fig.2 shows a typical electron pulse emitted by the gun. Shorter electron pulses up to 5 ns can be generated by a beam blanking unit.
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Anyaegbu, Esther, Gary Brodin, John Cooper, Enrique Aguado et Said Boussakta. « An Integrated Pulsed Interference Mitigation for GNSS Receivers ». Journal of Navigation 61, no 2 (25 mars 2008) : 239–55. http://dx.doi.org/10.1017/s0373463307004572.

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The E5/L5 frequency band for the new Global Navigation Satellite System (GNSS) signals is crowded with aeronautical pulsed emitters. This results in severe degradation of the performance of GNSS receivers. This paper describes a novel technique for estimating and suppressing time-varying pulsed interference signals such as the Distance Measuring Equipment (DME)/Tactical Air Navigation (TACAN) signals generated by these pulsed emitters. The proposed technique involves the integration of the time-based pulse blanker and the wavelet-based interference mitigation technique. Aviation is the key application considered although many other applications such as transport management and navigation, environmental monitoring, and telecommunications would benefit. A performance assessment of the new technique is carried out by determining the degradation of the carrier-to-noise ratio (CNR) at the output of the correlator. The performance of the new technique is compared with the traditional time domain pulse blanking approach. The results show that the proposed technique performs better than both the time domain pulse blanker and the wavelet-based interference mitigation algorithm. Hence, the integrated pulse mitigation approach can be employed to provide an enhanced degree of interference detection and suppression.
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MURAKAMI, Tomohiro, Ming YANG, Hiroshi KISHI, Masahiro OHKAWA, Mitsuhiro SAKURAI et Eiichi FUJINO. « Reducing Blanking Vibration with Counter Pulse Using Servo Press Slide ». Journal of the Japan Society for Technology of Plasticity 58, no 675 (2017) : 311–16. http://dx.doi.org/10.9773/sosei.58.311.

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Guo, Yong Feng, Ji Cheng Bai, Li Qing Li et Cheng Jun Li. « Study on Surface Performance of Carbon-Aluminum-Carbon Electrode of Super-Capacitor in Dry WEDM ». Key Engineering Materials 375-376 (mars 2008) : 401–5. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.401.

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Super-capacitors are new equipments for energy storage，and they have wide application in practice. At present, blanking is used to machining the electrodes of super-capacitor; however, the disadvantages of the method are burrs, electrode collapse. A new method processing electrode of super-capacitor, wire electrical discharge machining in gas (dry WEDM), were presented in this paper, and the electrode surface morphologies were studied utilizing scan electron microscope (SEM). First, the surface morphologies comparison studies of super-capacitor electrodes processed with different method, such as shearing, blanking and dry WEDM etc., were performed, and research results show that the super-capacitor electrode surfaces machined by dry WEDM achieve flat machining surface, and electrode edges do not collapse. Further surface morphology analysis was carried out based on different pulse durations and air pressure, and analysis results indicate that better machining surface can be achieved when suitable pulse duration and gas pressure are selected. Finally, surface energy spectrum analysis of the super-capacitor electrode processed by dry WEDM is performed, and the analysis result show that alumina are formed on the middle of electrode, aluminum foil, which is favored to the performance of super-capacitor.
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Niamsuwan, Noppasin, Joel T. Johnson et Steven W. Ellingson. « Examination of a simple pulse-blanking technique for radio frequency interference mitigation ». Radio Science 40, no 5 (8 juin 2005) : n/a. http://dx.doi.org/10.1029/2004rs003155.

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Vuong, Duc-Phuc, Dang-Khanh Le, Khac-Khiem Nguyen et Binh Van Nguyen. « Correlation Receiver With Nonlinearity Blanking for DCSK Systems Under Pulse Jamming Attack ». IEEE Access 7 (2019) : 25037–45. http://dx.doi.org/10.1109/access.2019.2900259.

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Laffite, S., S. D. Baton, P. Combis, J. Clerouin, M. Koenig, V. Recoules, C. Rousseaux et L. Videau. « Velocity Interferometer blanking due to preheating in a double pulse planar experiment ». Physics of Plasmas 21, no 8 (août 2014) : 082705. http://dx.doi.org/10.1063/1.4892184.

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Thèses sur le sujet "Pulse blanking"

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Lillrose, Micah A. « High-speed data acquisition and FPGA detected pulse blanking system for interference mitigation in radio astronomy / ». Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2076.pdf.

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Lillrose, Micah Alexander. « High-Speed Data Acquisition and FPGA Detected Pulse Blanking System for Interference Mitigation in Radio Astronomy ». BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1177.

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Radio astronomy is the discipline dedicated to the study of celestial emissions in the radio band from a few MHz to 300 GHz. In recent years, spurious emissions from man-made devices that operate at these frequencies have made detection of astronomical signals difficult. These harmful RF transmissions are called radio frequency interference (RFI). One strategy to remove RFI is to apply spatial filtering using an array antenna. This thesis documents the development of a high-speed data acquisition system used to record data from 7- and 19-element phased array feeds. The system supports synchronous sampling over all channels and streams data to disk allowing spatial filtering to be applied in post-processing. The development of a time blanking RFI mitigation system was also developed as part of this thesis. Time blanking is a strategy to remove radar interference by blanking the time intervals corrupted by radar transmissions. The two blanking strategies are time window blanking and detected pulse blanking. This thesis documents the design and implementation of a detected pulse blanking system built using FPGAs. The system employs complex signal processing techniques to detect and excise radar transmissions in real time. This FPGA RFI mitigation system is the first to use a matched filter in pulse detection. Successful radio frequency interference mitigation is demonstrated by removing simulated radar interference from a sinusoidal tone.
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MUSUMECI, LUCIANO. « Advanced signal processing techniques for interference removal in Satellite Navigation Systems ». Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2550137.

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This thesis investigates the use of innovative interference detection and mitigation techniques for GNSS based applications. The main purpose of this thesis is the development of advanced signal processing techniques outperforming current interference mitigation algorithms already implemented in off-the-shelf GNSS receivers. State-of-the-art interference countermeasures already investigated in literature, which process the signal at the ADC output, provide interference components suppression in the time domain or in the frequency domain, thus leading to a significant signal degradation in harmful interference scenarios where the GNSS signals spectra at the receiver antenna is completely jammed by external intentional or unintentional RFI sources. The proposed advanced interference countermeasures overcome such a limit, since they are based on particular signal processing techniques which manipulate the received samples at the ADC output, providing a representation in new domains where interference component can be better detected and separated from the rest of the signal, minimizing the useful signal distortion even in presence of multiple interference sources. At the cost of an increased computational complexity, such techniques can be optimized for increasing the sensitivity and the robustness of GNSS receiver merged in harmful environments. The work of this thesis addresses the design of such techniques by means of theoretical analyses, their performance assessment by means of simulation and their validation by means of synthetic and real GNSS data. Furthermore performance comparison with more traditional interference countermeasures is also presented considering a variety of harmful interference scenarios. In addition to the investigation of such new interference countermeasures, part of the thesis deals with the limit of current interference suppression technique, such as the pulse blanking, and its impact on the data demodulation performance. A very general investigation of the pulse blanking impact on the data demodulation performance for un-coded BPSK DSSS is provided. Then, the analysis focuses on the assessment of the navigation data demodulation performance for the current SBAS, then providing a proposal for system improvements, in terms of robustness and data rate increase, in future SBAS generation. Among the different interference scenarios considered, the thesis focuses on the potential interference environment expected in aviation context, since the Galileo E5 and GPS L5 bands, where the future GNSS based aviation services will be broadcast, are shared with other ARNS broadcasting strong pulsed interfering signals, which may seriously threat the on-board GNSS receiver operations . For such scenarios, simulation and analytic models are discussed and used as benchmark cases for assessing the mitigation techniques, in terms of SNR gain and data demodulation capability. The presence of interference (mitigated or not) causes a loss in the carrier to noise density ratio CN0 value for the received signal. For this reason, in order to reliably deal with such signals, the GNSS receiver must be able to feature high-sensitivity algorithms at the acquisition and tracking stages. For this reason the last part of the thesis investigates HS acquisition schemes for very weak GNSS signal detection. In particular, the purpose of this part of the work is to present a theoretical methodology for the design of an acquisition scheme capable of detecting signal down to 5 dB-Hz. The analysis carried out assuming the presence of assistance information which allows the receiver employing long coherent integration time (order of seconds). The particular scenario of the GNSS space environment is taken into consideration and the analysis is also focused on the definition of the requirements on the accuracy for potential Doppler aiding sources at the receiver level. The theoretical analysis is also supported by fully software simulation.
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Actes de conférences sur le sujet "Pulse blanking"

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Borio, Daniele. « Swept GNSS jamming mitigation through pulse blanking ». Dans 2016 European Navigation Conference (ENC). IEEE, 2016. http://dx.doi.org/10.1109/euronav.2016.7530549.

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R�gamer, Alexander, Shrikul Joshi, J. Rossouw van der Merwe, Fabio Garzia, Wolfgang Felber, Jan Wendel et Frank M. Schubert. « Chirp Mitigation for Wideband GNSS Signals with Filter Bank Pulse Blanking ». Dans 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017). Institute of Navigation, 2017. http://dx.doi.org/10.33012/2017.15289.

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Luo, Jinlong. « Time-domain channel estimation for aeronautical OFDM system with pulse blanking ». Dans 2015 Integrated Communication, Navigation, and Surveillance Conference (ICNS). IEEE, 2015. http://dx.doi.org/10.1109/icnsurv.2015.7121347.

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He, Yuan, Ming Jiang, Xiaoning Wu et Chunming Zhao. « Performance analysis and optimization for LDPC coded OFDM systems with pulse blanking ». Dans 2018 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2018. http://dx.doi.org/10.1109/wcnc.2018.8377021.

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Zhao, Di, Jichao Jiao et Weijie Tan. « Pulse-detecting Approach with Adjustable PRIs Using Interferences Blanking in TACAN System ». Dans 2020 International Conference on Networking and Network Applications (NaNA). IEEE, 2020. http://dx.doi.org/10.1109/nana51271.2020.00032.

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Musumeci, Luciano, et Fabio Dovis. « Effect of pulse blanking on navigation data demodulation performance in GNSS system ». Dans 2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014. IEEE, 2014. http://dx.doi.org/10.1109/plans.2014.6851500.

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Brandes, Sinja, Ulrich Epple et Michael Schnell. « Compensation of the Impact of Interference Mitigation by Pulse Blanking in OFDM Systems ». Dans GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference. IEEE, 2009. http://dx.doi.org/10.1109/glocom.2009.5426056.

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Kodama, Kazuki, et Daisuke Ueda. « Effect of introducing optical blanking to GaN epitaxy by using pulsed laser deposition technology ». Dans 2019 Compound Semiconductor Week (CSW). IEEE, 2019. http://dx.doi.org/10.1109/iciprm.2019.8819360.

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