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检索条件"任意字段=Conference on Radar Sensor Technology"

共 5986 条记录，以下是81-90 订阅

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A New while Drilling High Resolution Caliper and Oil Base Mud Electrical Imager Using Advanced radar technology

A New while Drilling High Resolution Caliper and Oil Base Mu...

引用

2024 IADC/SPE International Drilling conference and Exhibition, DC 2024

作者： Øy, L. Bye, I. Barrouillet, B. Lauritzen, M. Chemali, R.E. WELL ID Sandnes Norway

ISBN: (纸本)9781959025108

A new LWD sensor is introduced for measuring a high-resolution borehole image in large boreholes and both in light and heavy oil base mud. The new sensor uses advanced radar technology, and in addition to caliper (time-of-flight) image, delivers an electrical image to help geoscientists visualize and understand the stratigraphy and fractures. A pulse radar operating in the multi-gigahertz range is implemented within the bottom hole assembly. As the BHA rotates, the radar measurements scan the borehole surface. The time of flight is converted to a distance to the borehole wall. The amplitude of the reflected signal correlates with the micro-resistivity/ permittivity of the formation in the immediate vicinity of the borehole. Up until recently, sensors capable of performing these caliper measurements while drilling have been limited to smaller size boreholes and lighter muds. A new technology, based on a downhole radar rotating with the bottom hole assembly extends the application to boreholes of 18 inches and more in oil base mud. The same technology yields a micro-resistivity/permittivity image that is prized by the geoscientists for recognizing key geological features, including layered formations, fractures, faults, and unconformities. Here again the new technology is the first to our knowledge to obtain such information while drilling in large holes and light and heavy oil base mud. A new technology, namely the downhole pulsed GHz radar brings a new solution to well-known problems. High resolution calipers and micro-resistivity images while drilling have been made available to the industry in recent years, however they are restricted to smaller than 12 1/4"boreholes and water base mud. The article below explains how and how well the new technology has significantly increased the range of applicability to oil base mud for large hole sizes, like 12 1/4"and 17-1/2". Copyright © 2024, IADC/SPE International Drilling conference and Exhibition.

关键词： Boreholes

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Experimental Progress using Quantum Binary Waveforms and Immediate Idler Detection Techniques for Remote Sensing 28

Experimental Progress using Quantum Binary Waveforms and Imm...

引用

conference on radar sensor technology XXVIII

作者： Brandsema, Matthew J. Ross, Leslie A. Semone, Sky Kalyanapuram, Nikhil Argyropoulos, Christos Ozdemir, Sahin K. Penn State Univ Appl Res Lab State Coll PA 16803 USA Penn State Univ Dept Elect Engn University Pk PA 16802 USA Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA Penn State Univ Mat Res Inst University Pk PA 16802 USA

ISBN: (纸本)9781510674158;9781510674141

Two current hurdles of quantum radar/LiDAR technology are i.) The use of joint measurement techniques, whereby the idler remains in a delay line or a quantum memory to be measured later with the returning signal, and ii.) The difficulty in creating high photon flux signals for long range sensing. Our measurement and detection protocol using immediate-idler-detection (IID) helps to alleviate both of these issues. We present our recent experimental data from characterizing our proof-of-concept IID quantum LiDAR system and show that similar to delay line approaches, we achieve strong correlation even in extremely noisy channels where the noise level exceeds the signal strength by as much as one hundred times. We have found that even in very lossy channels, the integration time remains extremely short and roughly the same value even as the noise is increased. We also show preliminary results through foggy free space channels and found positive correlation SNR even when the visibility was as low as 15%. Our measurement and detection protocol was designed to align closely with classical radar and LiDAR signal processing to better align the quantum and classical sensor regimes and allows for the potential to scale upwards and produce higher photon-flux signals from multiple photon pair sources.

关键词： quantum radar quantum lidar experiment remote sensing signal processing matched filter quantum sensing quantum science

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A Novel Wideband Absorber for RCS Reduction 16

A Novel Wideband Absorber for RCS Reduction

引用

16th International conference on Microwave and Millimeter Wave technology (ICMMT)

作者： Zhao, Huachen Li, Zengrui Commun Univ China Sch Informat & Commun Engn Beijing 100024 Peoples R China

ISBN: (纸本)9798350389968

This work proposes a novel wideband absorber for radar cross section (RCS) reduction. The absorber achieves wideband absorption under the action of a resistor-loaded double metal layer. Simulation results show that the proposed absorber has a 10 dB RCS reduction in the 5.46-16.79 GHz bandwidth with a fractional bandwidth of 101.84% under normal incidence. The RCS reduction performance of the absorber under TE and TM polarization at oblique incidence is also analyzed. The absorber achieves wideband RCS reduction with a simple structure and low processing and assembly costs, and thus has the potential to be suitable for future stealth applications.

关键词： Double-layer absorber multiple resonances radar cross section (RCS) reduction

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Development of Efficient Electromagnetic Simulation Software Based on Physical Optics 16

Development of Efficient Electromagnetic Simulation Software...

引用

16th International conference on Microwave and Millimeter Wave technology (ICMMT)

作者： Zhang, Doudou Huang, Tao Huang, Yao Jin, Xiaolin Univ Elect Sci & Technol China Sch Elect Sci & Engn Chengdu 611731 Peoples R China

ISBN: (纸本)9798350389968

Based on physical optics (PO) algorithm and BUMBLEBEE electromagnetic simulation software, a high-frequency asymptotic solver is developed in this paper. Combined with practical application, the developed solver supports PEC material and PEC surface coating material and supports simulation calculation of monostatic, bistatic, and inverse synthetic aperture radar (ISAR). In terms of algorithm, the influence of multiple occlusion on triangular element classification is considered, and the Ludwig algorithm is used to discretize the scattering field of a single illuminated surface element, which improves the simulation accuracy. The reliability of the high-frequency asymptotic solver is verified by three numerical examples.

关键词： Inverse synthetic aperture radar

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Double Threshold Range Spread Target Detection based on Scattering Point Estimation in radar Systems 16

Double Threshold Range Spread Target Detection based on Scat...

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16th International conference on Microwave and Millimeter Wave technology (ICMMT)

作者： Sun, Haowen Zhao, Guoqiang Hu, Bing Beijing Inst Technol Sch Integrated Circuits & Elect Beijing Peoples R China

ISBN: (纸本)9798350389968

In this paper, a double threshold constant false alarm detection method based on estimated scattering point information is proposed to solve the problem of range spread target detection under unknown scattering point information. First, the k-nearest neighbor classification (KNN) algorithm is used to classify the area to be detected and calculate the first threshold. Then the second threshold is calculated based on the constant false alarm rate, and the second thresholds are used to determine whether the target is present. The simulation results show that this method uses echo information to estimate target scattering points to solve the problem of range spread target detection without any priori information, and has high detection accuracy and robustness.

关键词： radar target recognition

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Design of an Oval-shaped Aperture Ridge-waveguide Antenna for Phased Array radar Applications 16

Design of an Oval-shaped Aperture Ridge-waveguide Antenna fo...

引用

16th International conference on Microwave and Millimeter Wave technology (ICMMT)

作者： Li, Chao Jiang, Shi-bo Zong, Yao Ding, Di Wu, Fei-fei Xian Elect Engn Res Inst Xian 710100 Peoples R China

ISBN: (纸本)9798350389968

In this paper, an oval-shaped aperture ridge waveguide phased array antenna at millimeter wave (MMW) band is proposed for phased array radar applications. First, the ridge waveguide antenna and the feeding power divider are developed. secondly, a prototype of proposed antenna system is fabricated and measured. The experimental results indicate that the proposed phased array antenna achieves a wide bandwidth of 2GHz at MMW band and a coverage of +/- 40 degrees beam scanning. Furthermore, sidelobes level of the receiving beams are below -22.9dB and -25.2dB in azimuth axis and elevation axis respectively.

关键词： Oval-shaped Ridge-waveguide Phased Array antenna

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Extended Kalman-based multi-sensor fusion 39

Extended Kalman-based multi-sensor fusion

引用

39th Youth Academic Annual conference of Chinese-Association-of-Automation (YAC)

作者： Bali, Guzhalayi Xie, Leong Li, Penghua Ilolov, Mamadsho Xinjiang Univ Sch Elect Engn Urumqi Peoples R China Chongqing Univ Posts & Telecommun Sch Automat Chongqing Peoples R China Natl Acad Sci Tajikistan Ctr Innovat Dev Sci & New Technol Dushanbe Tajikistan

ISBN: (纸本)9798350390780;9798350379228

With the continuous development of sensor technology and electronic information technology, data fusion technology is of great significance in improving the system's ability of detecting, recognizing and tracking targets. That is, a single sensor can only provide partially imprecise information, thus not excluding ambiguity in the description of the external environment. Given the complementarity exhibited by the differences in the performance of the sensors, synthesizing the information from individual sensors results in more accurate and reliable information than a single sensor can provide. A multi-sensor fusion method based on extended Kalman is proposed to address this problem. Experimental results show that the accuracy and robustness of target detection and tracking can be significantly improved by the fusion of infrared and millimeter wave radar data.

关键词： Extended Kalman filtering multi-sensor fusion temporal calibration

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Low-profile and low-RCS Antenna using Polarization Conversion Metasurface 16

Low-profile and low-RCS Antenna using Polarization Conversio...

引用

16th International conference on Microwave and Millimeter Wave technology (ICMMT)

作者： Qu, Weizhe Zhou, Dongfang Liu, Qing Zhang, Dewei Xu, Honghui Wang, Ningning PLA Strateg Support Informat Engn Univ Zhengzhou 450001 Peoples R China

ISBN: (纸本)9798350389968

In this paper, a microstrip patch antenna which uses polarization conversion metasurface(PCM) to achieve in-band and out-of-band radar cross section (RCS) reduction is proposed. As is shown in simulation results, the combination of the polarization conversion metasurface improves the radiation and scattering performance of the proposed antenna. The proposed PCM realizes bandwidth with PCR over 90% is 7.82 - 13.2 GHz (about 25.6% fractional bandwidth). The proposed antenna's gain at 9.55GHz increases about 1.3dBi than the reference one. Eventually, the average bandwidth of 10dB RCS reduction ranges from 7.1 to 11GHz.

关键词： Polarization conversion metasurface(PCM) Patch antenna radar cross section (RCS)

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Electromagnetic modeling and analysis of micro-Doppler characteristics of simulated human limping gaits 28

Electromagnetic modeling and analysis of micro-Doppler chara...

引用

conference on radar sensor technology XXVIII

作者： Zeng, Cunhao Narayanan, Ram M. Onks, Cayce A. Penn State Univ Dept Elect Engn University Pk PA 16802 USA Penn State Hershey Med Ctr Dept Family Med & Orthopaed Hershey PA 17033 USA

ISBN: (纸本)9781510674158;9781510674141

In recent years, the recognition and analysis of human gaits have garnered significant interest in diverse applications such as biometrics, healthcare, and security. This paper presents a simulation study and analysis of limps of different severities and comparison with normal walking gait. Various limp gaits were simulated by adjusting some of the parameters in a well-known gait model developed for normal gait. Analysis was performed by extracting various metrics using the micro-Doppler features as well as the Hilbert-Huang model, which show differences for limping stages. It is conjectured that by combining micro-Doppler features with specific metrics derived from HHT analysis, it may be possible to detect the onset of limp gait and to assess its severity.

关键词： Micro-Doppler Hilbert-Huang transform Electromagnetic Modeling Human Gait Limping radar

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Application of First-Order Non-Autonomous Chaos Synchronization for Bistatic radar System 28

Application of First-Order Non-Autonomous Chaos Synchronizat...

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conference on radar sensor technology XXVIII

作者： Megas, Vasileios Pappu, Chandra S. Beal, Aubrey N. Syed, Tamseel M. Union Coll Schenectady NY 12308 USA Univ Alabama Huntsville Huntsville AL USA

ISBN: (纸本)9781510674158;9781510674141

This work reports the potential of first-order, non-autonomous chaotic circuits for bistatic radar applications. Unlike most chaotic systems, 1st order chaotic systems offer closed-form analytic solutions that aid in designing simple matched filters. In this work, a signal generated by a 1st chaotic oscillator is transmitted toward both the receiver and the target, enabling the use of this waveform for two purposes. First, the waveform serves to synchronize the bistatic radar receiver. Second, the waveform assists in acquiring an estimate of the target's range. For the first time, we show that two 1st order chaotic circuits can be synchronized using a simple resistive coupling. The cross-correlation between the two synchronized circuits is of high quality, exhibiting a narrow main lobe width and low sidelobe levels. Consequently, these 1st order systems can generate high-range resolution profiles in bistatic configurations. Lastly, analytical expressions show that the cross-ambiguity function between the echo received from the target and synchronized waveforms yields a near thumb-tack shape, emphasizing the value of a noise-like waveform for radar-ranging applications.

关键词： Non-autonomous chaotic system bistatic radar synchronization correlation ambiguity function

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