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Millimeter wave imaging of Range Migration Algorithm with adaptive background filtering 认领 引用
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作者 CHENG Zhi-Hua ZHOU Ran +3 位作者 WANG Meng YU Tao WANG Yu-Lan YAO Jian-Quan 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2026年第2期279-284,共6页
This paper proposes a novel Range Migration Algorithm(RMA)integrated with an adaptive background filtering method specifically designed for near-field millimeter-wave imaging scenarios where targets are in close proxi... This paper proposes a novel Range Migration Algorithm(RMA)integrated with an adaptive background filtering method specifically designed for near-field millimeter-wave imaging scenarios where targets are in close proximity to background structures.This method simulates the attention distribution mode of the human visual system which is used in Artificial Intelligence(AI)and called the Attention Mechanism.Based on the concept of static clutter filtering,the frequency-domain signals of the scanning aperture are divided into grid cells.Background scattering functions are established by analyzing the motion processes within each cell,and the background interference is linearly filtered out.An analysis of the manifestation of background scattering interference within the algorithm is carried out,and the impact of the grid cell dimension on the imaging quality is investigated.Experimental results show that the proposed method exhibits the capability to enhance the signal-to-noise ratio of both the target and the background.It effectively suppresses the background interference,leading to a more prominent image,meanwhile without imposing the excessive computational load.The method offers a novel solution for improving the performance of millimeter-wave imaging technology in practical applications. 展开更多
关键词 information processing technology millimeter-wave imaging Range Migration Algorithm(RMA) attention mechanism adaptive background filtering
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Structural Damage Diagnosis Based onMulti-Stage Sparrow Search Algorithm 认领 引用
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作者 Lijun Yang Qiuwei Yang 《Computers, Materials & Continua》 SCIE EI 2026年第9期2449-2468,共20页
This study proposes a Multi-Stage Sparrow Search Algorithm(MS-SSA)for precise structural damage identification.Initially,the structural static displacement sensitivity formulation is derived via the Sherman-Morrison-W... This study proposes a Multi-Stage Sparrow Search Algorithm(MS-SSA)for precise structural damage identification.Initially,the structural static displacement sensitivity formulation is derived via the Sherman-Morrison-Woodbury formula,and an objective function is constructed by integrating the sensitivity equations with the L2-norm penalty.Subsequently,MS-SSA is implemented to sequentially achieve preliminary damage localization and accurate quantification.In the localization phase,a constrained narrow-bound search space is predefined to identify potential damage regions.Leveraging this feedback,the sensitivity equations are condensed,and the search boundaries are adaptively refined for the quantification phase,where SSA is reapplied to precisely determine damage severity while mitigating misjudgments.TheMS-SSA framework exhibits two distinct advantages:(i)Phase I localization accelerates convergence by constraining the search space,as it does not target precise quantification;and(ii)the significant reduction in unknowns achieved by excluding intact elements in Phase II enables rapid convergence to the global optimum.Comparative studies against the GreyWolf Optimizer(GWO),Whale Optimization Algorithm(WOA),and standard SSA demonstrate that the proposed method effectively overcomes computational instability,slowconvergence,and large errors inherent in swarm intelligence optimization for damage identification.Specifically,numerical case studies reveal that the identification error is reduced to merely 9%~22%of that associated with existing methods,with experimental validation confirming reductions to 18%~22%.Overall,the proposed approach achieves high-fidelity damage identification while eliminating false positives and false negatives. 展开更多
关键词 Damage diagnosis static displacement sensitivity Sparrow Search Algorithm(SSA) narrow search range
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Pre-process algorithm for satellite laser ranging data based on curve recognition from points cloud 认领 引用
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作者 Liu Yanyu Zhao Dongming Wu Shan 《Geodesy and Geodynamics》 2012年第2期53-59,共7页
The satellite laser ranging (SLR) data quality from the COMPASS was analyzed, and the difference between curve recognition in computer vision and pre-process of SLR data finally proposed a new algorithm for SLR was ... The satellite laser ranging (SLR) data quality from the COMPASS was analyzed, and the difference between curve recognition in computer vision and pre-process of SLR data finally proposed a new algorithm for SLR was discussed data based on curve recognition from points cloud is proposed. The results obtained by the new algorithm are 85 % (or even higher) consistent with that of the screen displaying method, furthermore, the new method can process SLR data automatically, which makes it possible to be used in the development of the COMPASS navigation system. 展开更多
关键词 satellite laser ranging (SLR) curve recognition points cloud pre-process algorithm COM- PASS screen displaying
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Satellite range scheduling with the priority constraint: An improved genetic algorithm using a station ID encoding method 认领 引用 被引量:30
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作者 Li Yuqing Wang Rixin +1 位作者 Liu Yu Xu Minqiang 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第3期789-803,共15页
Abstract Satellite range scheduling with the priority constraint is one of the most important prob lems in the field of satellite operation. This paper proposes a station coding based genetic algorithm to solve this p... Abstract Satellite range scheduling with the priority constraint is one of the most important prob lems in the field of satellite operation. This paper proposes a station coding based genetic algorithm to solve this problem, which adopts a new chromosome encoding method that arranges tasks according to the ground station ID. The new encoding method contributes to reducing the complex ity in conflict checking and resolving, and helps to improve the ability to find optimal resolutions. Three different selection operators are designed to match the new encoding strategy, namely ran dom selection, greedy selection, and roulette selection. To demonstrate the benefits of the improved genetic algorithm, a basic genetic algorithm is designed in which two cross operators are presented, a singlepoint crossover and a multipoint crossover. For the purpose of algorithm test and analysis, a problemgenerating program is designed, which can simulate problems by modeling features encountered in realworld problems. Based on the problem generator, computational results and analysis are made and illustrated for the scheduling of multiple ground stations. 展开更多
关键词 Genetic algorithm Ground space scheduling Priority Satellite range scheduling Space communication
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High Resolution SAR Image Algorithm with Sample Length Constraints for the Range Direction 认领 引用 被引量:4
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作者 Zhenli Wang Qun Wang +1 位作者 Fujuan Li Shuai Wang 《Computers, Materials & Continua》 SCIE EI 2020年第6期1533-1543,共11页
The traditional Range Doppler(RD)algorithm is unable to meet practical needs owing to the limit of resolution.The order of fractional Fourier Transform(FrFT)and the length of sampling signals affect SAR imaging perfor... The traditional Range Doppler(RD)algorithm is unable to meet practical needs owing to the limit of resolution.The order of fractional Fourier Transform(FrFT)and the length of sampling signals affect SAR imaging performance when FrFT is applied to RD algorithm.To overcome the above shortcomings,the purpose of this paper is to propose a high-resolution SAR image algorithm by using the optimal order of FrFT and the sample length constraints for the range direction.The expression of the optimal order of SAR range signals via FrFT is deduced in detail.The initial sample length and its constraints are proposed to obtain the best sample length of SAR range signals.Experimental results demonstrate that,when the range sampling-length changes in a certain interval,the best sampling-length will be obtained,which the best values of the range resolution,PSLR and ISLR,will be derived respectively.Compared with traditional RD algorithm,the main-lobe width of the peak-point target of the proposed algorithm is narrow in the range direction.While the peak amplitude of the first side-lobe is reduced significantly,those of other side-lobes also drop in various degrees. 展开更多
关键词 Fractional Fourier transform synthetic aperture radar range doppler algorithm image quality assessment
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Short Range Top Attack Trajectory Optimum Design Based on Genetic Algorithm 认领 引用
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作者 唐胜景 许晓霞 戴斌 《Journal of Beijing Institute of Technology》 EI CAS 2006年第1期13-16,共4页
A flying-body is considered as the reference model, the optimized mathematical model is established. The genetic operators are designed and algorithm parameters are selected reasonably. The scheme control signal in sh... A flying-body is considered as the reference model, the optimized mathematical model is established. The genetic operators are designed and algorithm parameters are selected reasonably. The scheme control signal in short range top attack flight trajectory is optimized by using genetic algorithm. The short range top attack trajectory designed meets the design requirements, with the increase of the falling angle and the decrease of the minimum range. The application of genetic algorithm to top attack trajectory optimization is proved to be feasibly and effectively according to the analyses of results. 展开更多
关键词 genetic algorithm short range top attack trajectory optimum design
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Effects of transmitter-related parameter settings on ranging accuracy for IR-UWB systems 认领 引用
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作者 吴绍华 张钦宇 张乃通 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第1期51-57,共7页
For impulse radio ultra-wideband (IR-UWB) ranging systems,effects of the settings of transmitter-related parameters, which include the pulse shape, the bandwidth and the pulse repetition interval (PRI), on ranging acc... For impulse radio ultra-wideband (IR-UWB) ranging systems,effects of the settings of transmitter-related parameters, which include the pulse shape, the bandwidth and the pulse repetition interval (PRI), on ranging accuracy were studied through theoretical analysis and simulations. Both the match-filtering based coherent TOA estimation algorithm and the energy-detection based non-coherent algorithm were used during simulations. Results show that the pulse shape has the least effect on the ranging accuracy. Increasing the pulse bandwidth can improve the ranging performance, but the performance is hardly improved any more when the bandwidth is increased beyond a certain level. PRI should be set long enough to guarantee the accurate ranging, because when PRI is shorter than the maximum excess delay of the channel, the ranging accuracy will be deteriorated by inter-pulse interference. 展开更多
关键词 IR-UWB ranging TOA estimation algorithm parameter setting match-filtering energy-detection
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基于WiMAX系统的初始Ranging检测算法 认领 引用
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作者 李美艳 《信息技术》 2012年第8期81-83,88,共3页
初始Ranging过程是WiMAX系统上行链路中的重要过程,首先对基于差分法的Ranging检测算法进行了深入分析,然后提出了一种改进算法,该改进算法提高了低SNR下的检测率,且时偏估计的准确度大大提高,能够直接支持超远距离覆盖,解决了WiMAX系... 初始Ranging过程是WiMAX系统上行链路中的重要过程,首先对基于差分法的Ranging检测算法进行了深入分析,然后提出了一种改进算法,该改进算法提高了低SNR下的检测率,且时偏估计的准确度大大提高,能够直接支持超远距离覆盖,解决了WiMAX系统上行接入受限问题。最后通过计算机仿真比较了改进算法的性能,仿真结果表明,所提出的改进算法在技术复杂度和系统性能上具有较大的优势。 展开更多
关键词 Ranging 差分法 检测算法 系统性能
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Comparison of Microwave Imaging Algorithms for Short-Range Scenarios 认领 引用
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作者 Zhengyue Dong Ning Xu Kuiwen Xu 《Journal of Beijing Institute of Technology》 EI CAS 2024年第3期227-236,共10页
Three dimensional(3-D)imaging algorithms with irregular planar multiple-input-multiple-output(MIMO)arrays are discussed and compared with each other.Based on the same MIMO array,a modified back projection algorithm(MB... Three dimensional(3-D)imaging algorithms with irregular planar multiple-input-multiple-output(MIMO)arrays are discussed and compared with each other.Based on the same MIMO array,a modified back projection algorithm(MBPA)is accordingly proposed and four imaging algorithms are used for comparison,back-projection method(BP),back-projection one in time domain(BP-TD),modified back-projection one and fast Fourier transform(FFT)-based MIMO range migration algorithm(FFT-based MIMO RMA).All of the algorithms have been implemented in practical application scenarios by use of the proposed imaging system.Back to the practical applications,MIMO array-based imaging system with wide-bandwidth properties provides an efficient tool to detect objects hidden behind a wall.An MIMO imaging radar system,composed of a vector network analyzer(VNA),a set of switches,and an array of Vivaldi antennas,have been designed,fabricated,and tested.Then,these algorithms have been applied to measured data collected in different scenarios constituted by five metallic spheres in the absence and in the presence of a wall between the antennas and the targets in simulation and pliers in free space for experimental test.Finally,the focusing properties and time consumption of the above algorithms are compared. 展开更多
关键词 multiple-input-multiple-output(MIMO) short-range imaging back projection modi-fied back propagation range migration algorithm(RMA) through-wall imaging
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MLSI-RT: memorize LOS range measurements identified residual test location algorithm and performance analysis 认领 引用
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作者 马兵 邢建平 张军 《Journal of Shanghai University(English Edition)》 2011年第3期190-193,共4页
The dominant error source of mobile terminal location in wireless sensor networks (WSNs) is the non-line-of-sight (NLOS) propagation error. Among the algorithms proposed to mitigate the influence of NLOS propagati... The dominant error source of mobile terminal location in wireless sensor networks (WSNs) is the non-line-of-sight (NLOS) propagation error. Among the algorithms proposed to mitigate the influence of NLOS propagation error, residual test (RT) is an efficient one, however with high computational complexity (CC). An improved algorithm that memorizes the light of sight (LOS) range measurements (RMs) identified memorize LOS range measurements identified residual test (MLSI-RT) is presented in this paper to address this problem. The MLSI-RT is based on the assumption that when all RMs are from LOS propagations, the normalized residual follows the central Chi-Square distribution while for NLOS cases it is non-central. This study can reduce the CC by more than 90%. 展开更多
关键词 memorize LOS range measurements identified residual test (MLSI-RT) computational complexity (CC) nonline-of-sight (NLOS) residual test (RT) algorithm simplified residual test (SRT)
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矩形光束照明的距离选通水下动态成像(特邀) 认领 引用 被引量:1
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作者 魏自浩 王子豪 +2 位作者 董路 管帅 郭金家 《光学学报》 EI CAS CSCD 北大核心 2026年第12期233-246,共14页
针对水下远距离、大视场及动态成像的需求,设计并研制一套基于矩形光束照明的距离选通水下成像系统。该系统通过时间门控有效抑制水体后向散射,采用矩形光束提升能量利用率,并在紧凑型结构中内置扫描镜,可支持移动式与固定式两种扫描模... 针对水下远距离、大视场及动态成像的需求,设计并研制一套基于矩形光束照明的距离选通水下成像系统。该系统通过时间门控有效抑制水体后向散射,采用矩形光束提升能量利用率,并在紧凑型结构中内置扫描镜,可支持移动式与固定式两种扫描模式,以适应不同应用场景。实验结果表明,系统在25 m距离下可实现5 cm的分辨率,有效成像距离达到7.6个衰减长度,并验证了其在大视场快速扫描条件下的成像能力。同时,将元启发式算法应用于水下距离选通成像的动态校正,将姿态估计问题建模为全局优化任务,构建兼顾水下特征稀疏、高噪声与弱纹理特性的复合目标函数,提出一种基于粒子群优化的图像配准方法。该方法在目标轮廓重建与细节复原方面优于传统特征点方法与深度学习方法,有效提升系统在水下动态场景下的成像能力。 展开更多
关键词 水下成像 距离选通 矩形光束照明 元启发式算法 图像配准
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卡尔曼级联滤波的激光测距轨迹自动跟踪方法 认领 引用 被引量:1
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作者 胡聪娟 李洲荣 《激光杂志》 CAS 北大核心 2026年第5期235-240,共6页
当目标进行变速运动或转弯等复杂运动时,以往跟踪方法往往难以保持稳定的跟踪性能,导致运行轨迹偏离预期。针对上述问题,研究一种卡尔曼级联滤波的激光测距轨迹自动跟踪方法。利用激光雷达实时获取目标的距离信息并以此计算目标三维坐... 当目标进行变速运动或转弯等复杂运动时,以往跟踪方法往往难以保持稳定的跟踪性能,导致运行轨迹偏离预期。针对上述问题,研究一种卡尔曼级联滤波的激光测距轨迹自动跟踪方法。利用激光雷达实时获取目标的距离信息并以此计算目标三维坐标。利用这些测量数据,结合系统的状态转移模型,通过卡尔曼级联滤波器对目标状态进行预测和更新,得到当前时刻的最优状态估计。基于最优状态估计设计跟踪性能评价指标,通过蜂群算法不断地迭代计算,求出运动参数,使得跟踪轨迹能够逐渐收敛到预期轨迹上,从而实现轨迹跟踪。结果表明:无论是在匀速直线运动场景还是变速转弯运动场景下,该方法均能有效降低跟踪误差,提高跟踪性能。 展开更多
关键词 卡尔曼级联滤波 激光测距 蜂群算法 状态估计 轨迹自动跟踪方法
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CIR指纹区间约束的高斯混合模型ToA测距优化定位方法 认领 引用
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作者 吴仕勋 滕森 +3 位作者 蓝章礼 徐凯 张淼 张生军 《测绘科学》 CSCD 北大核心 2026年第2期11-22,共12页
针对现有超宽带(UWB)定位方法在混合非视距(NLoS)与视距(LoS)场景下定位性能不佳的问题,该文提出了一种融合信道脉冲响应(CIR)指纹与到达时间(ToA)测距的混合定位方法。首先设计了一种结合CBAM注意力机制和残差连接的卷积神经网络,用于... 针对现有超宽带(UWB)定位方法在混合非视距(NLoS)与视距(LoS)场景下定位性能不佳的问题,该文提出了一种融合信道脉冲响应(CIR)指纹与到达时间(ToA)测距的混合定位方法。首先设计了一种结合CBAM注意力机制和残差连接的卷积神经网络,用于提取CIR数据的特征并实现指纹定位;接着引入共形预测为指纹结果生成预测区间作为约束;然后利用高斯混合模型对ToA测距误差建模,并采用粒子群优化算法在约束区间内搜索;最后通过约束加权策略对粒子位置加权平均得到最终位置估计。公开数据集测试结果表明,该方法在平均误差、误差中位数和标准差上均优于五种现有算法,定位精度提升幅度至少达21.2%。 展开更多
关键词 UWB定位 ToA测距 共形预测 高斯混合模型 粒子群优化算法
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基于无人机LiDAR和改进Otsu算法的玉米地边界识别方法研究 认领 引用
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作者 王果 王成 +2 位作者 薛帅栋 林鑫林 文栋 《激光技术》 CAS CSCD 北大核心 2026年第1期93-98,共6页
为了高效、自动化地获取大田玉米地边界范围,利用无人机激光雷达(LiDAR)获取高密度点云,经过点云滤波和高程归一化,对最大类间方差(Otsu)算法进行改进,并结合形态学开运算和闭运算以及Canny算子进行检测,采用一种基于无人机LiDAR和改进... 为了高效、自动化地获取大田玉米地边界范围,利用无人机激光雷达(LiDAR)获取高密度点云,经过点云滤波和高程归一化,对最大类间方差(Otsu)算法进行改进,并结合形态学开运算和闭运算以及Canny算子进行检测,采用一种基于无人机LiDAR和改进的Otsu算法对大田环境下的玉米地边界进行识别,选取一个果园研究区域开展了试验验证。结果表明,基于无人机LiDAR和改进的Otsu算法能迭代出最优的玉米地识别阈值,经边缘检测后可识别出大田环境下玉米地边界,通过试验区的正射影像图取样验证,该方法对大田玉米地边界识别精确,验证了其有效性。该研究在大田玉米地边界识别、作物估产以及智慧农业研究领域具有良好的工程应用参考价值。 展开更多
关键词 图像处理 无人机激光雷达 改进的Otsu算法 玉米地边界 自动识别
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基于激光测距的深松作业检测技术 认领 引用
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作者 侯云涛 吴泽全 +4 位作者 蔡晓华 东忠阁 程睿 李源源 祝天宇 《农机化研究》 北大核心 2026年第4期110-117,共8页
针对激光测距技术在深松作业检测中的应用进行深入研究,提出了一种自适应多门限值误差拟合方法。算法通过自适应调整多个门限值,动态寻找激光飞行时间误差最佳拟合校正方案,能够有效克服回波信号上升沿鉴别时刻因干扰脉冲产生的误差。... 针对激光测距技术在深松作业检测中的应用进行深入研究,提出了一种自适应多门限值误差拟合方法。算法通过自适应调整多个门限值,动态寻找激光飞行时间误差最佳拟合校正方案,能够有效克服回波信号上升沿鉴别时刻因干扰脉冲产生的误差。基于此方法,研发了一款智能化深松作业检测设备,其能够自主进行耕层断面数据的采集和保存,提高数据采集和处理的效率。同时,开展了测距试验,具体方法为:将SICK DL100-22AA2101激光测距仪的测距值作为标准距离,试验距离为1~4 m,取1 m作为步长,基于所研发设备,采用本文方法与双门限值时刻鉴别方法分别对同一距离进行5次测量作为实测距离,比较实测距离的标准差,以及实测距离均值与对应标准距离的误差。采用本文研发设备和人工方式分别对土壤膨松度和扰动系数进行检测,设备检测结果为土壤蓬松度27.0%、土壤扰动系数22.3%,人工方式检测结果为土壤蓬松度27.1%、土壤扰动系数22.7%。试验证明:研发设备在显著提高测量效率的前提下,得到的测量结果与传统人工测量方式几乎没有差异,具有较高的实用性和可靠性。 展开更多
关键词 深松作业检测 激光测距 自适应多门限值误差拟合算法
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基于改进多策略鲸鱼优化算法的三维路径规划 认领 引用
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作者 关燕鹏 李子鸣 要会娟 《控制工程》 CSCD 北大核心 2026年第6期961-970,共10页
无人机路径规划问题是在复杂地形环境下寻找出发点到目的地之间最优路径的组合优化问题。针对传统鲸鱼优化算法在解决该优化问题时存在的收敛速度慢、收敛精度低、容易陷入局部最优等缺陷,提出一种基于多策略的鲸鱼优化算法。首先,引入T... 无人机路径规划问题是在复杂地形环境下寻找出发点到目的地之间最优路径的组合优化问题。针对传统鲸鱼优化算法在解决该优化问题时存在的收敛速度慢、收敛精度低、容易陷入局部最优等缺陷,提出一种基于多策略的鲸鱼优化算法。首先,引入Tent混沌映射与动态反向学习机制对种群进行初始化,提高初始种群的质量并加快收敛速度。然后,引入自适应搜索范围调整策略与黄金正弦算法移动策略提高原算法的搜索充分性与收敛精度。最后,引入自适应变异机制来自适应规划种群变异方向,提高种群的局部搜索能力和跳出局部最优的能力。与其他群智能算法相比,所提算法在收敛精度、全局搜索能力以及解决无人机路径规划问题方面均存在显著优势。 展开更多
关键词 Tent混沌映射 鲸鱼优化算法 动态反向学习 自适应搜索范围 黄金正弦算法 自适应变异机制
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融合坡面分割与改进遗传算法的露天矿边坡贴近摄影测量路径优化方法 认领 引用
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作者 张周爱 张浩 +4 位作者 邓文学 王佳钰 张磊 曹新峰 何荣兴 《中国矿业》 CAS 北大核心 2026年第6期130-138,共9页
无人机倾斜摄影测量是边坡地质结构精细调查的重要工具,然而传统航线规划方法难以兼顾效率与精度,制约了节理、裂隙等精细地质信息的有效获取。为此,本文提出一种融合坡面分割与改进遗传算法的贴近摄影测量路径优化方法。该方法以低分... 无人机倾斜摄影测量是边坡地质结构精细调查的重要工具,然而传统航线规划方法难以兼顾效率与精度,制约了节理、裂隙等精细地质信息的有效获取。为此,本文提出一种融合坡面分割与改进遗传算法的贴近摄影测量路径优化方法。该方法以低分辨率初始点云模型为输入,首先,通过坡面分割与分类,将航测资源精准聚焦于地质结构发育的陡峭区域;然后,为各重点坡面规划贴合表面、多视角交会的精细化航线,以采集高分辨率影像;最后,构建带方向选择的旅行商问题模型,采用改进遗传算法求解多单元航线的相对最优拼接路径,从而实现从粗模型到精数据的高效过渡。以宝日希勒露天煤矿采场中地质结构密集区域为实验区进行验证,研究结果表明:该方法在确保关键区域达到厘米级影像分辨率的同时,基于大疆M3E无人机平台的优化航测路径总长度较传统仿地飞行减少90%,显著增强了地质结构信息的识别效率,为露天矿边坡精细调查提供了可靠的技术方案。 展开更多
关键词 无人机路径优化 贴近摄影测量 改进遗传算法 坡面分割 露天矿边坡
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基于毫米波雷达的密集筋无损检测 认领 引用
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作者 李天博 石珂 王颢 《江苏大学学报(自然科学版)》 CAS 北大核心 2026年第2期232-238,共7页
为解决钢筋混凝土结构中密集筋检测效果不佳的难题,提出了一种基于毫米波雷达的密集筋无损检测方法.首先建立了毫米波雷达信号模型,并基于距离徙动算法,搭建了近场合成孔径检测系统,用以采集钢筋混凝土结构的数据.然后利用距离徙动算法... 为解决钢筋混凝土结构中密集筋检测效果不佳的难题,提出了一种基于毫米波雷达的密集筋无损检测方法.首先建立了毫米波雷达信号模型,并基于距离徙动算法,搭建了近场合成孔径检测系统,用以采集钢筋混凝土结构的数据.然后利用距离徙动算法重建了不同深度的钢筋图像.在此基础上,采用Kuan滤波方法抑制图像杂波.最后,利用滤波后的图像定量计算了钢筋直径和间距.试验结果表明:基于Kuan滤波图像坐标的计算结果精度较高,其中钢筋直径与间距的检测误差均小于2 mm,保护层厚度误差小于5 mm;相较于均值滤波效果、中值滤波效果,Kuan滤波获取的钢筋图像更为清晰. 展开更多
关键词 钢筋混凝土 无损检测 毫米波雷达 合成孔径 雷达成像 距离徙动算法
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基于双边双向测距+Taylor级数-最小二乘法的UWB动态定位研究 认领 引用
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作者 原茹艳 耿保伟 《国外电子测量技术》 2026年第3期192-196,共5页
为实现医院后勤运送人员的精准定位,提出一种基于超宽带(Ultra-Wide Band,UWB)技术的人员动态定位方法。该方法采用双边双向测距(Two-Way Ranging,TWR)作为UWB系统的核心测距算法,并引入Taylor级数展开算法的最小二乘法进行几何位置估计... 为实现医院后勤运送人员的精准定位,提出一种基于超宽带(Ultra-Wide Band,UWB)技术的人员动态定位方法。该方法采用双边双向测距(Two-Way Ranging,TWR)作为UWB系统的核心测距算法,并引入Taylor级数展开算法的最小二乘法进行几何位置估计,从而实现对后勤运送人员的动态定位。实验结果表明,本文方法对不同运送轨迹的后勤人员定位均方根误差(Root Mean Square Error,RMSE)为3.23 cm,相较于其他方法降低了约4 cm,定位精度处于厘米级水平,表现出优异的定位性能。研究结果证明,该方法通过对医院后勤人员的动态定位,可实现人员移动轨迹的全过程可追溯,为医疗安全管理与风险防控提供了技术参考。 展开更多
关键词 UWB定位技术 双边双向测距算法 最小二乘法 Taylor级数展开算法
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基于车载毫米波雷达的物体缺陷成像方法 认领 引用
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作者 王俊林 李平 王鑫 《内蒙古大学学报(自然科学版)》 CAS 2026年第4期352-360,共9页
现代工业对物体无损检测的精度与成本提出更高要求,然而传统检测方式均存在一定的局限性。微波成像中的近场合成孔径雷达(Synthetic aperture radar,SAR)成像技术,因其具有无接触和高分辨率等优点成为无损检测的研究热点。得益于自动驾... 现代工业对物体无损检测的精度与成本提出更高要求,然而传统检测方式均存在一定的局限性。微波成像中的近场合成孔径雷达(Synthetic aperture radar,SAR)成像技术,因其具有无接触和高分辨率等优点成为无损检测的研究热点。得益于自动驾驶的兴起,车载毫米波雷达凭借较低成本逐渐应用于近场SAR成像无损检测,但现有方法大多侧重于二维成像,对于目标三维重构研究略显不足。针对这一问题,基于近似小斜视距离-多普勒算法(Range-doppler algorithm,RDA)间接三维成像方法,通过推导平面扫描阵列下的斜距近似模型,利用距离向解耦特性执行逐距离门二维聚焦,最后堆叠二维结果获取目标的三维散射强度分布。为验证该方法对物体形状及缺陷的表征能力,分别对塑料柄金属剪刀及顶部带有42 mm×4.5 mm孔洞的金属支架进行测试实验。结果显示,三维重构能较好地还原剪刀及支架的整体几何轮廓。进一步对支架三维散射强度分布进行切面分析,测得支架孔洞尺寸约为41 mm×4 mm,长度与宽度误差分别为1 mm和0.5 mm。实验证明了该方法能够反映缺陷的空间位置与尺寸特征,在低成本工业无损检测中具有一定的应用可行性。 展开更多
关键词 车载毫米波雷达 SAR成像技术 距离-多普勒算法(RDA)
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