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检索条件"任意字段=Conference on Signal and Data Processing of Small Targets"

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A New Method for ISAR Imaging of Non-cooperative targets

A New Method for ISAR Imaging of Non-cooperative Targets

引用

signal, Information and data processing (ICSIDP), IEEE International conference on

作者： Hetong Wang Zhen Dong College of Electronic Science and Technology National University of Defense Technology Changsha China

ISBN: (数字)9798331515669

ISBN: (纸本)9798331515676

In the imaging of non-cooperative targets in inverse synthetic aperture radar (ISAR), the migration through range cells (MTRC) and phase error caused by rotation will lead to image blur. To address these challenges, this paper introduces a harmonic wavelet imaging algorithm based on Keystone transform. The algorithm corrects MTRC through Keystone transform and realizes efficient processing of target signals through harmonic wavelet transform, thereby obtaining high-resolution ISAR images. Moreover, this approach circumvents the need for prior target information, streamlines the imaging process, and is well-suited for high-resolution imaging of non-cooperative targets. The method’s effectiveness is confirmed through scattering point simulation data. Experimental results demonstrate that this approach produces clear and well-focused ISAR images even when targets rotate at varying speeds. In comparison to traditional imaging methods, the image contrast achieved by this algorithm is enhanced by 1 to 2 times.

关键词： Wavelet transforms Time-frequency analysis Imaging High-resolution imaging Radar imaging Streaming media Harmonic analysis Wavelet analysis Solids signal resolution

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Research on inertial navigation component measurement and control system 18

Research on inertial navigation component measurement and co...

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18th International conference on Computational Intelligence and Security, CIS 2022

作者： Xu, Yuan Tan, Tao Ma, Chao Macao Polytechnic University Macao China Dongguan City University Guangdong Dongguan China Xi'An Technological University Shaanxi Xi'an China

ISBN: (纸本)9798350346275

To improve the test efficiency of inertial navigation components and meet the measurement requirements of multi-type signal output. This paper proposes a dual-mode inertial navigation data acquisition system based on FPGA and USB. The system is based on FGPA EP4CE10F17 and USB CY7C68013 chips. which can realize seamless counting of 48 channels of pulse signals output by 4 channels of inertial navigation components, and can also collect output data of 8 channels of inertial navigation serial ports. FPGA controls data acquisition, USB realizes high-speed data transmission, measurement, and control computer realizes data processing, storage and display. The system has been tested on site for a long time, which has the characteristics of stable operation, high precision and small size. © 2022 IEEE.

关键词： data acquisition

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Three dimensional synthetic and real aperture sonar technologies with Doppler velocity log and small fiber optic gyrocompass for autonomous underwater vehicle

Three dimensional synthetic and real aperture sonar technolo...

引用

MTS/IEEE Oceans conference

作者： Asada, Akira Ura, Tamaki Univ Tokyo Inst Ind Sci Tokyo Japan

ISBN: (纸本)9781467308298

The technologies could be expected a practical application of searching for submarine minerals, such as thermal vents a few meters high, to a depth of 3,000 meters. In order to develop exploration technologies for submarine resources, new sensor technology needs to be developed for use with autonomous underwater vehicles (AUV) or remotely operated vehicle (ROV). We have used an optic gyrocompass CDL Mini POS-II and a Doppler velocity log (DVL) RD WH300 for the research on three dimensional synthetic and real aperture sonar technologies. However, these sensors with pressure housing are too large to mount on autonomous underwater vehicle (AUV). So, in cooperation with IXBLUE and OceanWings, we created a small fiber optic gyrocompass (FOG) with motion sensors based on IMU-50 and packed it in a small pressure housing with an outer diameter 112 mm and a length 295mm. We extracted a unit composed of three-axes angular velocity and three-axes velocity sensors and a serial interface from the IMU-50, and add it to a RS-232C converter board. Then we achieved the original software for measuring heading based on the true-north, roll, and pitch angles using the raw increment data from the small fiber optic gyrocompass. Compared with the high-performance FOG IXBLUE PHINS with accuracy 0.01 degrees, the original software achieved the true north estimation with accuracy 0.25 degrees of the same one as IXBLUE Quadrance based on IMU50 without a pressure housing. As for a small DVL NavQuest 600 is employed for optical gyrocompass and DVL navigation for the SAS processing. With respect to developing and researching on three dimensional synthetic and real aperture sonar technologies, we originally designed and manufactured the five raw hydrophone arrays with 40 hydrophone elements in a shape of triangle and have made several sea tests on targets of breakwaters, fishing banks, and hydrothermal vents. So far, we have developed the software for producing three dimensional backscatter image

关键词： Synthetic aperture sonar Interferometric bathymetry sonar autonomous underwater vehicle

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A Linear Approach for Radiometric Calibration of Full-Waveform Lidar data

A Linear Approach for Radiometric Calibration of Full-Wavefo...

引用

conference on Image and signal processing for Remote Sensing XVIII

作者： Roncat, Andreas Pfeifer, Norbert Briese, Christian Vienna Univ Technol Inst Photogrammetry & Remote Sensing IPF AT-1040 Vienna Austria

ISBN: (纸本)9780819492777

During the past decade, small-footprint full-waveform lidar systems have become increasingly available, especially airborne. The primary output of these systems is high-resolution topographic information in the form of three-dimensional point clouds over large areas. Recording the temporal profile of the transmitted laser pulse and of its echoes enables to detect more echoes per pulse than in the case of discrete-return lidar systems, resulting in a higher point density over complex terrain. Furthermore, full-waveform instruments also allow for retrieving radiometric information of the scanned surfaces, commonly as an amplitude value and an echo width stored together with the 3D coordinates of the single points. However, the radiometric information needs to be calibrated in order to merge datasets acquired at different altitudes and/or with different instruments, so that the radiometric information becomes an object property independent of the flight mission and instrument parameters. State-of-the-art radiometric calibration techniques for full-waveform lidar data are based on Gaussian Decomposition to overcome the ill-posedness of the inherent inversion problem, i.e. deconvolution. However, these approaches make strong assumptions on the temporal profile of the transmitted laser pulse and the physical properties of the scanned surfaces, represented by the differential backscatter cross-section. In this paper, we present a novel approach for radiometric calibration using uniform B-splines. This kind of functions allows for linear inversion without constraining the temporal shape of the modeled signals. The theoretical derivation is illustrated by examples recorded with a Riegl LMS-Q560 and an Optech ALTM 3100 system, respectively.

关键词： Lidar Airborne Radiometric Calibration Linear Inversion B-Splines Full-Waveform

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A pulse-Doppler processing scheme for quadrature compressive sampling radar

A pulse-Doppler processing scheme for quadrature compressive...

引用

International conference on Digital signal processing (DSP)

作者： Chao Liu Feng Xi Shengyao Chen Zhong Liu Department of Electronic Engineering Nanjing University of Science & Technology Nanjing Jiangsu PRC

Quadrature compressive sampling (QuadCS) is a sub-Nyquist sampling system for acquiring inphase and quadrature (I/Q) components of radio-frequency signals. This paper discusses the application of the QuadCS system to pulse-Doppler radars and develops a compressive sampling pulse-Doppler (CoSaPD) processing scheme from the sub-Nyquist samples. The Doppler estimation is realized through spectrum analyzer as in classic processing. The detection is done on the Doppler bin data. The range estimation is performed through sparse recovery algorithms on the detected targets. Due to inherent detection property of the recovery algorithms, the detection threshold can be set at a low value and then the introduced false targets are removed in the range estimation stage. Simulation results show that the CoSaPD scheme with the data at one eighth the Nyquist rate and for SNR above -25dB can achieve performance of the classic processing with Nyquist samples.

关键词： Doppler effect Estimation Radar signal to noise ratio Detectors Discrete Fourier transforms

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A Fast DOA Estimation Method for Multi-Target with small-Size Array in AUV 17

A Fast DOA Estimation Method for Multi-Target with Small-Siz...

引用

17th ACM International conference on Underwater Networks and Systems (WUWNet)

作者： Wang, Wenbo Shen, Tongsheng Zhao, Dexin Li, Ye Liu, Feng Harbin Engn Univ Sci & Technol Underwater Vehicle Lab Harbin Peoples R China Natl Innovat Inst Def Technol Beijing Peoples R China

ISBN: (纸本)9798400716744

As a new approach to underwater signal acquisition, small-size passive arrays deployed on autonomous underwater vehicles (AUVs) have some performance limitations for DOA estimation. On the one hand, there is the problem of real-time front-end processing;on the other hand, there is the problem of estimation accuracy. Especially when faced with a multi-target problem, too small an angle between the sources and too large an energy difference between the signals can make DOA estimation difficult. This article introduces an improved sparse DOA estimation method for practical multi-objective DOA estimation in complex scenarios of AUV platforms. The main work of this thesis is to introduce a new updating formula in the sparse iterative covariance process, and it will dramatically speed up sparse fitting and somewhat solve the aperture problem for small-size arrays. Compared to other sparse methods, the method completes the DOA estimation more quickly without prior information about the target. Finally, simulations have verified the method's effectiveness.

关键词： Autonomous underwater vehicles

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18th International conference on Artificial Intelligence and Natural Language processing and International conference on Artificial Intelligence and Internet of Things, iSAI-NLP 2023

18th International Conference on Artificial Intelligence and...

引用

18th International Joint Symposium on Artificial Intelligence and Natural Language processing, iSAI-NLP 2023 and 4th International conference on Artificial Intelligence and Internet of Things, AIoT 2023

ISBN: (纸本)9798350371215

The proceedings contain 43 papers. The topics discussed include: solar-powered IoT charging system for ESP32 in organic rice field;STAT intelligence: data management and monitoring platform for BCG economy model;comment usefulness classification on YouTube using artificial neural networks;vehicle telematics system design for real-time applications using mobile networks;using knowledge graphs to enhance keyword search efficiency of the online encyclopedia and taxonomy system of the office of the royal society;decode brain signal into Thai word using EEG and L-SVM;cloud stateless server failover prediction using machine learning on proactive system metrics;generative AI for self-healing systems;machine learning to examine the foraging periods of bees;spoof detection using voice contribution on LFCC features and ResNet-34;and Simple2In1: a simple method for fusing two sequences from different captioning systems into one sequence for a small-scale Thai dataset.

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ESTIMATING PHONEME FORMANT targets AND COARTICULATION PARAMETERS OF CONVERSATIONAL AND CLEARSPEECH

ESTIMATING PHONEME FORMANT TARGETS AND COARTICULATION PARAME...

引用

IEEE International conference on Acoustics, Speech and signal processing

作者： Brian O. Bush Alexander Kain Center for Spoken Language Understanding Oregon Health & Science University

ISBN: (纸本)9781479903573

We present a data-driven formant model and methodology for discovering its parameters, namely phoneme targets and coarticulation functions for consonant-vowel-consonant (CVC) words from fully-automatic formant data. The model uses formant targets that are speaker dependent, but independent of speaking style and phonemic context. We used a global error measure to search for optimal formant targets for all phonemes, including classes of sounds where formants are not directly observable. Analysis of coarticulation parameters found significant differences in parameters between clear and conversational speech. Estimated formant targets were largely in agreement with acoustic-phonetic expectations. An intelligibility test validated that resynthesized CVC words using modeled formant trajectories were nearly as intelligible as resynthesized CVC words using observed formant trajectories.

关键词： Coarticulation Formants Clear speech formant targets Global Error Phonemes

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Fast Three-Dimensional Imaging Method of Aerospace targets Based on Linear Array Radar 7th

Fast Three-Dimensional Imaging Method of Aerospace Targets B...

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7th China High-resolution Earth Observation conference, CHREOC 2020

作者： Yi, Zhang Anxi, Yu Guanghu, Jin Zhen, Dong College of Electronic Science and Technology National University of Defense Technology Hunan Changsha410073 China

ISBN: (纸本)9789811657344

Distributed Array Radar (DAR) uses space diversity to obtain better detection performance. As a new configuration of DAR, Linear Array Radar (LAR) can achieve a higher frame rate and higher dimensional imaging of aerospace targets. Based on the real-virtual aperture hybrid mode, LAR obtain the three-dimensional image of the target through space–time dimensions. The imaging process using the three-dimensional Back Projection (BP) algorithm accurately reconstruct the three-dimensional image of the target, but the amount of calculation is huge. In order to solve this problem, the Fast Factorized Back Projection (FFBP) algorithm is extended to three-dimensional space. And in the Cartesian coordinate system, a detailed theoretical derivation of the subaperture coarse image interpolation method is made. Through the imaging experiment and imaging quality evaluation of ideal point targets, it is verified that the fast imaging algorithm has good imaging quality. It has only a small performance loss compared with the traditional three-dimensional BP algorithm. The imaging processing time is also greatly reduced. In addition, this paper conducts imaging experiments based on satellite model simulation data generated by Radarbase. The results show that the algorithm can reconstruct the geometric configuration of the target well, which verifies the effectiveness of this algorithm. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Radar imaging

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Low Frequency Radio signal Polarisation Sensor with Applications in Attitude Estimation 13

Low Frequency Radio Signal Polarisation Sensor with Applicat...

引用

13th IEEE Sensors conference

作者： Maguire, Sean Robertson, Paul Univ Cambridge Dept Engn Cambridge England

ISBN: (纸本)9781479901616

A novel system for estimating the attitude (orientation) of a platform using measurements of Low Frequency (LF) radio signals is reported. The sensor system consists of an array of three orthogonal solenoid coil antennas, a three channel radio receiver circuit, a datalogging and control module and data processing algorithms. Traditional low-cost attitude estimation systems typically combine accelerometers, magnetometers and gyroscopes, but produce estimates that are sensitive to platform acceleration. This is a particular problem in high-acceleration, cost-constrained environments such as small fixed-wing Unmanned Aerial Vehicles. The system presented here is shown to accurately measure the axis of polarisation for signals with linear or almost linear polarisation, subject to a sign ambiguity. A representative AM radio broadcast in the LF band is shown to have a substantially linear polarisation, which is used to provide information about the sensor's attitude and shown to exhibit no drift over a period of 24 hours.

关键词： Polarization

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