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37th Chinese Control Conference, CCC 2018

作者： Wang, Guanzhong Dong, Haobin Ge, Jian Luo, Vang Liu, Huan Yuan, Zhiwen Zhu, Jun Zhang, Haiyang School of Automation China University of Geosciences Wuhan Hubei430074 China Hubei Key Laboratory of Advance Control and Intelligent Automation for Complex Systems Hubei Wuhan430074 China Science and Technology on Near-Surface Detection Laboratory Wuxi Jiangsu214035 China

ISBN: (纸本)9789881563941

Overhauser magnetometer is a weak magnetic measuring instrument based on the dynamic nuclear polarization of free radical species. It has the characteristics of high precision, high sensitivity, low power consumption and continuous measurement. It is widely used in geophysics, aeromagnetic surveying, satellite Magnetic measuring, military and various engineering fields. Aiming at the problem that the measurement accuracy of the magnetometer prototype is low and the measurement effect is poor when the angle between the probe axis and the geomagnetic field is 0°, several optimization methods are proposed and the magnetometer is optimized by adding the frequency measurement channel on the basis of the prototype. Based on the standard deviation of GSM-19 measurement data, comparing the experimental data that use the multi -channel frequency measurement algorithm, the standard deviation of prototype data decreases from 0.397 to 0.203 when the angle between probe axial and geomagnetic field is 45°, the standard deviation of the prototype data decreases from 0.631 to 0.371 when the angle between probe axial and geomagnetic field is 0°, which provides an important reference for the follow-up optimization of the magnetometer. © 2018 Technical Committee on Control Theory, Chinese Association of Automation.

关键词： Magnetometers

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A UWB/IMU-Assisted Fingerprinting Localization Framework with Low Human Efforts

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China Communications 2024年第6期21卷 40-52页

作者： Pan Hao Chen Yu Qi Xiaogang Liu Meili School of Mathematics and Statistics Xidian UniversityXi’an 710126China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China School of Software Nanchang Hangkong UniversityNanchang 330063China

With the rapid development of smart phone,the location-based services(LBS)have received great attention in the past *** to the widespread use of WiFi and Bluetooth devices,Received Signal Strength Indication(RSSI)fingerprintbased localization method has obtained much development in both academia and *** this work,we introduce an efficient way to reduce the labor-intensive site survey process,which uses an UWB/IMU-assisted fingerprint construction(UAFC)and localization framework based on the principle of Automatic radio map generation scheme(ARMGS)is proposed to replace the traditional manual *** be specific,UWB devices are employed to estimate the coordinates when the collector is moved in a reference point(RP).An anchor self-localization method is investigated to further reduce manual measurement work in a wide and complex environment,which is also a grueling,time-consuming process that is lead to artificial ***,the measurements of IMU are incorporated into the UWB localization algorithm and improve the label accuracy in *** addition,the weighted k-nearest neighbor(WKNN)algorithm is applied to online localization ***,filed experiments are carried out and the results confirm the effectiveness of the proposed approach.

关键词： indoor localization machine learning ultra wideband WiFi fingerprint

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An improved tuning control algorithm based on SVD for FID signal

An improved tuning control algorithm based on SVD for FID si...

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作者： Liu, Huan Dong, Hao Bin Ge, Jian Guo, Pei Pei Bai, Bing Jie Zhang, Cheng Department of School of Automation China University of Geosciences Wuhan Hubei430074 China Department of Institute of Geophysics and Geomatics China University of Geosciences Wuhan Hubei430074 China Science and Technology on Near-Surface Detection Laboratory Wuxi214035 China

The free induction decay (FID) quality signal of a proton precession magnetometer is closely related to tuning precision. To solve the commonly used current tuning problem method, we propose improving control algorithm tuning based on singular value decomposition (SVD). The space matrix is constructed by acquiring an analog-to-digital converter (ADC) for untuned FID signals, then conducting SVD to eliminate noise and obtain a useful signal. The fast Fourier transform (FFT) is then applied to the denoised FID signal to extract the time-frequency feature. Based on theory analysis, simulation modeling and actual FID signal testing, results show that compared to general tuning methods such as peak detection and auto correlation, our proposed algorithm improves sensor tuning precision and shortens tuning process time to one second or less.

关键词： Singular value decomposition

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Research on Electromagnetic Shielding Method for Engineering Equipment under the Condition of High-power Microwave

Research on Electromagnetic Shielding Method for Engineering...

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The Seventh Asia-Pacific Conference on Environmental Electromagnetics (CEEM'2015)

作者： Luo Genxin Xiang Dong Li Hao Science and Technology on Near-surface Detection Laboratory First Research Institute of General Armament Department Engineering Corps

The ultra-wide spectrum(UWS) high-power microwave(HPM) device produces great interference on vehicle-mounted electrical equipment during *** the developing process of equipment of certain type,a series of effective measures are proposed based on the features of electromagnetic radiation and conduction,which adopt EMI filter,electromagnetic shielding,certain electromagnetic interference suppressors and other technical means,so as to address the effects of HPM radiation on vehicle-mounted equipment and achieve the application of HPM technology in the engineering equipment for the first *** Paper combines the methods and experience accumulated in the development process of equipment,analyzes the mechanism and efficacy of different methods for electromagnetic shielding,obtains the optimization solution for UWS- HPM shielding and provides a practical and effective technical way to solve the difficulty of UWS- HPM shielding.

关键词： high-power microwave electromagnetic radiation electromagnetic shielding

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Simulation Study on Parachute-type High Power EMP Radiator

Simulation Study on Parachute-type High Power EMP Radiator

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The Seventh Asia-Pacific Conference on Environmental Electromagnetics (CEEM'2015)

作者： Zhu Yichao Zheng Shoujun Pan Shenghan Wu Sang Science and Technology on Near-surface Detection Laboratory First Research Institute of General Armament Department Engineering Corps

Rotating parabolic reflector antenna combined with parachute is designed to have a parachute-type high power EMP *** EM array complementary radiation as the design idea,a four-feed-arm parachute-type reflector antenna structure with higher feeding efficiency is proposed,thus to strengthen the low-frequency radiating capacity,widen the bandwidth of antenna and improve the radiant efficiency of antenna;a balanced feeding structure is also adopted to strengthen the radiating *** results showed that parachute-type radiator is superior to TEM horn antenna in bom peak-to-peak value of field strength and effective bandwidth of radiation field,thus making effective radiation of high-power UWB-EMP come true.

关键词： feed parabolic reflector EMP antenna

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Cascaded Sliding Window Based Real-Time 3D Region Proposal for Pedestrian detection*

Cascaded Sliding Window Based Real-Time 3D Region Proposal f...

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IEEE International Conference on Robotics and Biomimetics

作者： Jun Hu Tao Wu Hao Fu Zhiyu Wang Kai Ding College of Intelligence Science and Technology National University of Defense Technology Changsha China Science and Technology on Near-Surface Detection Laboratory Wuxi China

Pedestrian detection is an indispensable technology for designing autonomous driving systems. This paper proposes a cascaded sliding window based real-time approach to generate 3D pedestrian proposals on point clouds only. After rasterizing the raw point cloud, a 3D sliding window is adopted to extract pedestrian candidates. Two features are proposed to improve the proposal performance. One is the central points density feature, which acts as a filter to speed up the process and reduce false alarms. The other is the location feature, including the density distribution and height difference distribution of the point cloud, which describes the profile and location of an object in a sliding window. The scores generated by this feature are then applied to non-maximum suppression (NMS) to remove sub-optimal boxes. Experiments on the KITTI 3D object detection benchmark show that our approach achieves state-of-the-art results among comparable methods, while maintaining the speed and accuracy trade-off.

关键词：

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detection of UXO-like Targets with Portable Transient Electromagnetic System

Detection of UXO-like Targets with Portable Transient Electr...

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IEEE Advanced Information technology, Electronic and Automation Control Conference (IAEAC)

作者： Jun Zhu Haiyang Zhang Yuelin Xu Yu Qiu Shuang Zhang Shudong Chen Science and Technology on Near-Surface Detection Laboratory Wuxi China College of Electronic Science and Engineering Jilin University Changchun China

With the advantages of strong anti-interference ability and high spatial resolution, electromagnetic induction (EMI) has proven to be successful in unexploded ordnance (UXO detection. Portable transient electromagnetic system can work in a variety of complex conditions where the large and heavy vehicular systems cannot be readily used. The detection of UXO-like targets with portable transient electromagnetic (TEM) system is discussed detailed in this paper. Firstly, with description of the single dipole model for UXO response approximation, the location and characteristic response extraction for UXO-like targets is talked with the DE algorithm. Then, the improved sensor of the portable TEM system with a single-layered transmitting coil and five 3-component receiving coils is introduced. The transmitting coil is constructed with a diameter, number of turns, and transmitting current of 0.5 m, 30, and 5 A, respectively. The receiving coil is constructed with a length, number of turns, and resonant frequency of 6 cm, 600, and 180 kHz, respectively. Finally, 12 UXOs and 6 harmless targets buried in the area of 10 m × 6 m at different depths in different orientations have been detected with the improved portable TEM system. Target location and characteristic response have been estimated by DE algorithm with the measured response. The experimental results show that the high-quality data provided by the improved portable TEM system combined with the DE algorithm based on the dipole model can locate and characterize the separated targets accurately. Most of the position errors are within 10cm in x position and 5cm in depths for separated buried targets. For the multiple-targets buried together, the system can still locate and characterize the targets even if the response of two targets overlaps.

关键词： Tensile stress Mathematical model Magnetic moments Perpendicular magnetic recording Magnetic fields Transient analysis

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Research on subaperture stitching and absolute measurement technique for large rectangular plane mirrors 11

Research on subaperture stitching and absolute measurement t...

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Optical Metrology and Inspection for Industrial Applications XI 2024

作者： Zhang, Shaoteng Hu, Yao Hao, Qun Wang, Zhen Yang, Lixin School of Optics and Photonics Beijing Institute of Technology Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing10012 China Beijing Institute of Space Mechanics and Electricity Beijing100094 China

ISBN: (纸本)9781510682108

Large rectangular plane mirrors are widely used in high-power laser systems and synchrotron radiation sources, their surface precision affecting optical system performance. High-precision measurement methods are required to match these mirrors. The oblique incidence absolute measurement technique based on the rotational averaging method is a commonly method for these mirrors. But this method is complex, requires two additional plane mirrors. And it is limited by the angle of incidence, making it impossible to achieve both large aperture and high-resolution measurement simultaneously. Moreover, the method requires disassembling the test mirror during measurement, which significantly complicates the setup and adjustment process. Addressing the aforementioned shortcomings, this paper presents a high-precision measurement method for large rectangular plane mirrors. This method combines subaperture stitching techniques with the absolute measurement approach using the double shear translation method. It divides the test mirror into multiple overlapping subapertures and applies the double shear translation method to conduct absolute measurement on each subaperture region sequentially. Subsequently, employs algorithm to stitch the results together to achieve a complete surface. This method balances large aperture and high-resolution measurement, eliminates the influence of the reference surface. During the measurement process, only translations of the test mirror are required, making setup and adjustment relatively straightforward. Experimental validation of this method has demonstrated its ability to achieve high-precision measurement of rectangular plane mirrors. This paper presents an effective approach for high-precision measurement of large rectangular plane mirrors. © 2024 SPIE.

关键词： Optical systems

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Multi-camera wide field-of-view compound eye imaging system 11

Multi-camera wide field-of-view compound eye imaging system

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Optoelectronic Imaging and Multimedia technology XI 2024

作者： Qiao, Zhibo Hao, Qun Liu, Mengyao Wei, Jiale Cheng, Yang Key Laboratory of Biomimetic Robots and Systems Ministry of Education Beijing Institute of Technology Beijing100081 China Yangtze Delta Region Academy Beijing Institute of Technology Jiaxing314019 China National Key Laboratory on Near-Surface Detection Beijing100072 China

ISBN: (纸本)9781510682061

With the rapid development of security surveillance and autonomous driving, the demand for wide field-of-view imaging is increasingly growing. Traditional wide field-of-view (FOV) single-camera systems often suffer from significant distortion, making it challenging to achieve comprehensive environmental perception. Compound eyes, with tightly packed multiple sub-eyes, have the advantages of being compact, lightweight, and possessing a wide FOV with high sensitivity to moving targets. This paper analyzes the characteristics of wide FOV imaging of biomimetic compound eyes and integrates the imaging features of multiple cameras to design a multi-camera imaging system based on a biomimetic compound eye imaging system. The proposed system comprises nine cameras with a resolution of 640×480 arranged in a spherical multi-row configuration to emulate the compound eye structure. Given that feature matching significantly impacts the effectiveness of video stitching, we analyze and compare existing typical feature-matching algorithms from the aspects of both matching accuracy and robustness. Consequently, we employ the LightGlue on top of SuperPoint features for feature point matching to ensure the accuracy of subsequent video stitching. Through imaging experiments, the results demonstrate that this video stitching algorithm achieves satisfactory stitching results with minimal mismatches. The proposed multi-camera wide field-of-view compound eye imaging can realize wide wide-field imaging of 170°×120°with 8 frames per second. © 2024 SPIE.

关键词： Imaging systems

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The Influence of Environmental Radiation on the Infrared Characteristics of Low Emissivity surface 5

The Influence of Environmental Radiation on the Infrared Cha...

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5th International Conference on Optoelectronic science and Materials, ICOSM 2023

作者： Lv, Xiangyin Wang, Yahui Chen, Zongsheng Li, Zhigang Shi, Jiaming Anhui Provincial Laboratory of Advanced Laser Technology National University of Defense Technology Hefei230037 China Science and Technology on Near-Surface Detection Laboratory Wuxi214000 China State Key Laboratory of Pulsed Power Laser Technology National University of Defense Technology Anhui Hefei230037 China Anhui Provincial Key Laboratory of Infrared and Low Temperature Plasma Hefei230037 China

ISBN: (纸本)9781510674547

Low emissivity coatings or thin film materials are currently the main technical means for achieving infrared stealth. Due to the high reflectivity of low emissivity surfaces, environmental radiation such as solar radiation and ground radiation may have a significant impact on the effective infrared radiation of low emissivity surfaces. In response to the current research on low emissivity surface infrared radiation mainly limited to its suppression of self radiation, and the lack of information on the impact of environmental radiation on its effective radiation, starting from establishing a general infrared feature model that includes self emitted reflected environmental radiation, the focus is on deriving the effects of solar radiation and ground radiation on low emissivity surfaces in two atmospheric infrared windows 3-5 μm-band and 8-14 μm. The influence model of effective infrared radiation in the 3-5 μm-band has been calculated and experimentally verified. The results indicate that solar radiation and ground radiation have an impact on low emissivity materials in the mid infrared region of 3-5 μm-band and far Infrared 8-14 μm. The impact of effective infrared radiation in the two bands is different and is related to factors such as ground temperature, the angle between the target surface and the ground, the atmospheric transmittance of solar radiation, and the angle of solar incidence. In general, reducing the emissivity of a surface can reduce its effective infrared radiation, which is beneficial for achieving infrared stealth. However, there are two common exceptions that make using low emissivity materials not a good way to achieve infrared stealth. One is that when the surface temperature of the target is below 60 ℃, due to the influence of solar radiation, reducing reflectivity in the 3-5 μm-band may actually enhance its effective radiation. That is a challenge to the targets in the background of low and normal temperatures during a clear day range to real

关键词： Infrared radiation

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