Defence Technology(防务技术)最新文献_第5页

Graded density impactor design via machine learning and numerical simulation: Achieve controllable stress and strain rate 基于机器学习和数值模拟的梯度密度冲击器设计：实现可控应力应变率

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.003

Yahui Huang , Ruizhi Zhang , Shuaixiong Liu , Jian Peng , Yong Liu , Han Chen , Jian Zhang , Guoqiang Luo , Qiang Shen

{"title":"Graded density impactor design via machine learning and numerical simulation: Achieve controllable stress and strain rate","authors":"Yahui Huang , Ruizhi Zhang , Shuaixiong Liu , Jian Peng , Yong Liu , Han Chen , Jian Zhang , Guoqiang Luo , Qiang Shen","doi":"10.1016/j.dt.2025.05.003","DOIUrl":"10.1016/j.dt.2025.05.003","url":null,"abstract":"<div><div>The graded density impactor (GDI) dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons. The accuracy and timeliness of GDI structural design are key to achieving controllable stress-strain rate loading. In this study, we have, for the first time, combined one-dimensional fluid computational software with machine learning methods. We first elucidated the mechanisms by which GDI structures control stress and strain rates. Subsequently, we constructed a machine learning model to create a structure-property response surface. The results show that altering the loading velocity and interlayer thickness has a pronounced regulatory effect on stress and strain rates. In contrast, the impedance distribution index and target thickness have less significant effects on stress regulation, although there is a matching relationship between target thickness and interlayer thickness. Compared with traditional design methods, the machine learning approach offers a 10<sup>4</sup>–10<sup>5</sup> times increase in efficiency and the potential to achieve a global optimum, holding promise for guiding the design of GDI.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 262-273"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulated-unlimited sampling scheme and large dynamic range single carrier signals receiving in ultra-wideband frequency space 调制无限采样方案和在超宽带频率空间接收大动态范围单载波信号

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.005

Zhaoyang Qiu , Pei Wang , Chenpu Li

{"title":"Modulated-unlimited sampling scheme and large dynamic range single carrier signals receiving in ultra-wideband frequency space","authors":"Zhaoyang Qiu , Pei Wang , Chenpu Li","doi":"10.1016/j.dt.2025.05.005","DOIUrl":"10.1016/j.dt.2025.05.005","url":null,"abstract":"<div><div>Large dynamic range and ultra-wideband receiving abilities are significant for many receivers. With these abilities, receivers can obtain signals with different power in ultra-wideband frequency space without information loss. However, conventional receiving scheme is hard to have large dynamic range and ultra-wideband receiving simultaneously because of the analog-to-digital converter (ADC) dynamic range and sample rate limitations. In this paper, based on the modulated sampling and unlimited sampling, a novel receiving scheme is proposed to achieve large dynamic range and ultra-wideband receiving. Focusing on the single carrier signals, the proposed scheme only uses a single self-rest ADC (SR-ADC) with low sample rate, and it achieves large dynamic range and ultra-wideband receiving simultaneously. Two receiving scenarios are considered, and they are cooperative strong signal receiving and non-cooperative strong/weak signals receiving. In the cooperative receiving scenario, an improved fast recovery method is proposed to obtain the modulated sampling output. In the non-cooperative receiving scenario, the strong and weak signals with different carrier frequencies are considered, and the signal processing method can recover and estimate each signal. Simulation results show that the proposed scheme can realize large dynamic range and ultra-wideband receiving simultaneously when the input signal-to-noise (SNR) ratio is high.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 234-245"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Landing scheduling for carrier aircraft fleet considering bolting probability and aerial refueling 考虑锚固概率和空中加油的舰载机队降落调度

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.03.003

Genlai Zhang , Lei Wang , Zhilong Deng , Xuanbo Liu , Xichao Su , Haixu Li , Chen Lu , Kai Liu , Xinwei Wang

{"title":"Landing scheduling for carrier aircraft fleet considering bolting probability and aerial refueling","authors":"Genlai Zhang , Lei Wang , Zhilong Deng , Xuanbo Liu , Xichao Su , Haixu Li , Chen Lu , Kai Liu , Xinwei Wang","doi":"10.1016/j.dt.2025.03.003","DOIUrl":"10.1016/j.dt.2025.03.003","url":null,"abstract":"<div><div>Recovery is a crucial supporting process for carrier aircraft, where a reasonable landing scheduling is expected to guide the fleet landing safely and quickly. Currently, there is little research on this topic, and most of it neglects potential influence factors, leaving the corresponding supporting efficiency questionable. In this paper, we study the landing scheduling problem for carrier aircraft considering the effects of bolting and aerial refueling. Based on the analysis of recovery mode involving the above factors, two types of primary constraints (i.e., fuel constraint and wake interval constraint) are first described. Then, taking the landing sequencing as decision variables, a combinatorial optimization model with a compound objective function is formulated. Aiming at an efficient solution, an improved firefly algorithm is designed by integrating multiple evolutionary operators. In addition, a dynamic replanning mechanism is introduced to deal with special situations (i.e., the occurrence of bolting and fuel shortage), where the high efficiency of the designed algorithm facilitates the online scheduling adjustment within seconds. Finally, numerical simulations with sufficient and insufficient fuel cases are both carried out, highlighting the necessity to consider bolting and aerial refueling during the planning procedure. Simulation results reveal that a higher bolting probability, as well as extra aerial refueling operations caused by fuel shortage, will lead to longer recovery complete time. Meanwhile, due to the strong optimum-seeking capability and solution efficiency of the improved algorithm, adaptive scheduling can be generated within milliseconds to deal with special situations, significantly improving the safety and efficiency of the recovery process. An animation is accessible at bilibili.com/video/BV1QprKY2EwD.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 1-19"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144810012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A diagnosis method based on graph neural networks embedded with multirelationships of intrinsic mode functions for multiple mechanical faults 基于嵌入多内模态函数关系的图神经网络的多机械故障诊断方法

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.04.014

Bin Wang , Manyi Wang , Yadong Xu , Liangkuan Wang , Shiyu Chen , Xuanshi Chen

{"title":"A diagnosis method based on graph neural networks embedded with multirelationships of intrinsic mode functions for multiple mechanical faults","authors":"Bin Wang , Manyi Wang , Yadong Xu , Liangkuan Wang , Shiyu Chen , Xuanshi Chen","doi":"10.1016/j.dt.2025.04.014","DOIUrl":"10.1016/j.dt.2025.04.014","url":null,"abstract":"<div><div>Fault diagnosis occupies a pivotal position within the domain of machine and equipment management. Existing methods, however, often exhibit limitations in their scope of application, typically focusing on specific types of signals or faults in individual mechanical components while being constrained by data types and inherent characteristics. To address the limitations of existing methods, we propose a fault diagnosis method based on graph neural networks (GNNs) embedded with multirelationships of intrinsic mode functions (MIMF). The approach introduces a novel graph topological structure constructed from the features of intrinsic mode functions (IMFs) of monitored signals and their multirelationships. Additionally, a graph-level based fault diagnosis network model is designed to enhance feature learning capabilities for graph samples and enable flexible application across diverse signal sources and devices. Experimental validation with datasets including independent vibration signals for gear fault detection, mixed vibration signals for concurrent gear and bearing faults, and pressure signals for hydraulic cylinder leakage characterization demonstrates the model's adaptability and superior diagnostic accuracy across various types of signals and mechanical systems.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 364-373"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation on the combustion characteristics of scramjet at high Mach number 高马赫数超燃冲压发动机燃烧特性的数值模拟

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.04.018

Jiahang Li , Zhaoyang Xia , Mi Yan , Hao Zhang , Jinfeng Dang , Majie Zhao

{"title":"Numerical simulation on the combustion characteristics of scramjet at high Mach number","authors":"Jiahang Li , Zhaoyang Xia , Mi Yan , Hao Zhang , Jinfeng Dang , Majie Zhao","doi":"10.1016/j.dt.2025.04.018","DOIUrl":"10.1016/j.dt.2025.04.018","url":null,"abstract":"<div><div>To investigate the problem of ethylene jet mixing and combustion in the scramjet at high Mach number (<em>Ma</em> = 8), numerical simulations were carried out for different equivalent ratios at cold and combustion conditions, in which three-dimensional steady compressible RANS and <em>k-ω</em> SST turbulence model were adopted. It demonstrates that as the equivalence ratio increases from 0.42 to 1.08, the combustion becomes more intensified, and the higher backpressure pushes flame to propagate upstream. The supersonic combustion region in the combustor decreases from 92% to 85% with the increase of equivalence ratio from 0.42 to 1.08, resulting in the transition of the combustor from scram-mode to dual-mode. Both mixing and combustion efficiencies decrease by 35% and 16% respectively when the equivalence ratio increases from 0.42 to 1.08, indicating that the high equivalence ratio is unfavorable to the mixing and combustion processes. Combustion mode analysis reveals that the flame in the cavity under the high Mach number is dominated by non-premixed flames, i.e., more than 95% behaves as non-premixed mode, and the heat release is also mainly contributed by non-premixed flame. Increasing the equivalence ratio is beneficial to the thrust performance. Although the viscous force hardly changes with equivalence ratio, the percentage of pressure force used to balance the viscous force increases gradually, which limits the engine performance.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 155-165"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TA15/TaZrNb multi-element alloy prepared via diffusion bonding: Tensile-strength model and performance of a representative volume element embedded with a sphere 扩散键合法制备TA15/TaZrNb多元素合金：球面嵌套代表性体积元的抗拉强度模型及性能

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.03.018

Wei Chen , Fenglei Huang , Chuanting Wang , Ruijun Fan , Pengjie Zhang , Lida Che , Aiguo Pi

{"title":"TA15/TaZrNb multi-element alloy prepared via diffusion bonding: Tensile-strength model and performance of a representative volume element embedded with a sphere","authors":"Wei Chen , Fenglei Huang , Chuanting Wang , Ruijun Fan , Pengjie Zhang , Lida Che , Aiguo Pi","doi":"10.1016/j.dt.2025.03.018","DOIUrl":"10.1016/j.dt.2025.03.018","url":null,"abstract":"<div><div>In this study, to meet the development and application requirements for high-strength and high-toughness energetic structural materials, a representative volume element of a TA15 matrix embedded with a TaZrNb sphere was designed and fabricated via diffusion bonding. The mechanisms of the microstructural evolution of the TaZrNb/TA15 interface were investigated via SEM, EBSD, EDS, and XRD. Interface mechanical property tests and <em>in-situ</em> tensile tests were conducted on the sphere-containing structure, and an equivalent tensile-strength model was established for the structure. The results revealed that the TA15 titanium alloy and joint had high density and no pores or cracks. The thickness of the planar joint was approximately 50–60 μm. The average tensile and shear strengths were 767 MPa and 608 MPa, respectively. The thickness of the spherical joint was approximately 60 μm. The Zr and Nb elements in the joint diffused uniformly and formed strong bonds with Ti without forming intermetallic compounds. The interface exhibited submicron grain refinement and a concave–convex interlocking structure. The tensile fracture surface primarily exhibited intergranular fracture combined with some transgranular fracture, which constituted a quasi-brittle fracture mode. The shear fracture surface exhibited brittle fracture with regular arrangements of furrows. Internal fracture occurred along the spherical interface, as revealed by advanced <em>in-situ</em> X-ray microcomputed tomography. The experimental results agreed well with the theoretical predictions, indicating that the high-strength interface contributes to the overall strength and toughness of the sphere-containing structure.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 36-51"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144810022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Semantic segmentation of camouflage objects via fusing reconstructed multispectral and RGB images 基于重构多光谱和RGB图像融合的伪装目标语义分割

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.04.006

Feng Huang , Gonghan Yang , Jing Chen , Yixuan Xu , Jingze Su , Guimin Huang , Shu Wang , Wenxi Liu

{"title":"Semantic segmentation of camouflage objects via fusing reconstructed multispectral and RGB images","authors":"Feng Huang , Gonghan Yang , Jing Chen , Yixuan Xu , Jingze Su , Guimin Huang , Shu Wang , Wenxi Liu","doi":"10.1016/j.dt.2025.04.006","DOIUrl":"10.1016/j.dt.2025.04.006","url":null,"abstract":"<div><div>Accurate segmentation of camouflage objects in aerial imagery is vital for improving the efficiency of UAV-based reconnaissance and rescue missions. However, camouflage object segmentation is increasingly challenging due to advances in both camouflage materials and biological mimicry. Although multispectral-RGB based technology shows promise, conventional dual-aperture multispectral-RGB imaging systems are constrained by imprecise and time-consuming registration and fusion across different modalities, limiting their performance. Here, we propose the Reconstructed Multispectral-RGB Fusion Network (RMRF-Net), which reconstructs RGB images into multispectral ones, enabling efficient multimodal segmentation using only an RGB camera. Specifically, RMRF-Net employs a divergent-similarity feature correction strategy to minimize reconstruction errors and includes an efficient boundary-aware decoder to enhance object contours. Notably, we establish the first real-world aerial multispectral-RGB semantic segmentation of camouflage objects dataset, including 11 object categories. Experimental results demonstrate that RMRF-Net outperforms existing methods, achieving 17.38 FPS on the NVIDIA Jetson AGX Orin, with only a 0.96% drop in mIoU compared to the RTX 3090, showing its practical applicability in multimodal remote sensing.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 324-337"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reverse design of solid propellant grain based on deep learning: Imaging internal ballistic data 基于深度学习的固体推进剂颗粒反设计：内弹道数据成像

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.04.019

Lin Sun, Xiangyu Peng, Yang Liu, Shu Long, Weihua Hui, Ran Wei, Futing Bao

{"title":"Reverse design of solid propellant grain based on deep learning: Imaging internal ballistic data","authors":"Lin Sun, Xiangyu Peng, Yang Liu, Shu Long, Weihua Hui, Ran Wei, Futing Bao","doi":"10.1016/j.dt.2025.04.019","DOIUrl":"10.1016/j.dt.2025.04.019","url":null,"abstract":"<div><div>The reverse design of solid rocket motor (SRM) propellant grain involves determining the grain geometry to closely match a predefined internal ballistic curve. While existing reverse design methods are feasible, they often face challenges such as lengthy computation times and limited accuracy. To achieve rapid and accurate matching between the targeted ballistic curve and complex grain shape, this paper proposes a novel reverse design method for SRM propellant grain based on time-series data imaging and convolutional neural network (CNN). First, a finocyl grain shape-internal ballistic curve dataset is created using parametric modeling techniques to comprehensively cover the design space. Next, the internal ballistic time-series data is encoded into three-channel images, establishing a potential relationship between the ballistic curves and their image representations. A CNN is then constructed and trained using these encoded images. Once trained, the model enables efficient inference of propellant grain dimensions from a target internal ballistic curve. This paper conducts comparative experiments across various neural network models, validating the effectiveness of the feature extraction method that transforms internal ballistic time-series data into images, as well as its generalization capability across different CNN architectures. Ignition tests were performed based on the predicted propellant grain. The results demonstrate that the relative error between the experimental internal ballistic curves and the target curves is less than 5%, confirming the validity and feasibility of the proposed reverse design methodology.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 374-385"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the ignition and combustion characteristics of Al@AP incorporated with graded aluminum powder 掺加分级铝粉Al@AP的着火燃烧特性研究

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.05.019

Su-Lan Yang , Jing Wang , Zhi-Yu Zhang , Kan Xie , Ming-Hui Yu , Yue-Ke Xiong , Bin Tian

{"title":"Investigation of the ignition and combustion characteristics of Al@AP incorporated with graded aluminum powder","authors":"Su-Lan Yang , Jing Wang , Zhi-Yu Zhang , Kan Xie , Ming-Hui Yu , Yue-Ke Xiong , Bin Tian","doi":"10.1016/j.dt.2025.05.019","DOIUrl":"10.1016/j.dt.2025.05.019","url":null,"abstract":"<div><div>The utilization of graded Al powders offers the possibility to adjust the combustion performance of Al powders, while simultaneously safeguarding their energy properties. In this paper, a series of graded Al powder have been incorporated into the typical Al@AP composites through the spray drying technique. The thermal behavior, ignition and combustion characteristics were comprehensively evaluated and compared. The experimental results showed that with the varying inclusion of the graded Al, the heat of reaction exhibited a significant change, ranging from 9090 J·g<sup>−1</sup> to 11036 J·g<sup>−1</sup>, which was strongly dependent on the particle size of Al. The combination of Al with diverse range of particle sizes in graded configuration serves to significantly enhance the decomposition of AP, resulting in the disappearance of the LTD stage and a conspicuous decrease of at least 11.7 °C in the peak temperature of the HTD. Furthermore, the maximum burning rate achieved by the Al-3@AP composite was 33.6 mm·s<sup>−1</sup>, which was exactly twice as high as that of the graded Al-1@AP composite with the lowest burning rate. Diffraction peaks corresponding to unburned Al were detected in the condensed combustion products of Al-1@AP, and the combustion images clearly indicated an incomplete combustion tendency for this sample. In contrast, a well-designed gradation of Al powders, such as a combination of fine Al powders with a particle size below 5 μm, has proven to be the most conducive to enhancing the combustion efficiency of the composites.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 225-235"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A sparse moving array imaging approach for FMCW radar with dual-aperture adaptive azimuth ambiguity suppression and adaptive QR decomposition 基于双孔径自适应方位模糊抑制和自适应QR分解的FMCW雷达稀疏运动阵列成像方法

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-08-01 DOI: 10.1016/j.dt.2025.03.019

Yanwen Han, Xiaopeng Yan, Jiawei Wang, Sheng Zheng, Hongrui Yu, Jian Dai

{"title":"A sparse moving array imaging approach for FMCW radar with dual-aperture adaptive azimuth ambiguity suppression and adaptive QR decomposition","authors":"Yanwen Han, Xiaopeng Yan, Jiawei Wang, Sheng Zheng, Hongrui Yu, Jian Dai","doi":"10.1016/j.dt.2025.03.019","DOIUrl":"10.1016/j.dt.2025.03.019","url":null,"abstract":"<div><div>Range-azimuth imaging of ground targets via frequency-modulated continuous wave (FMCW) radar is crucial for effective target detection. However, when the pitch of the moving array constructed during motion exceeds the physical array aperture, azimuth ambiguity occurs, making range-azimuth imaging on a moving platform challenging. To address this issue, we theoretically analyze azimuth ambiguity generation in sparse motion arrays and propose a dual-aperture adaptive processing (DAAP) method for suppressing azimuth ambiguity. This method combines spatial multiple-input multiple-output (MIMO) arrays with sparse motion arrays to achieve high-resolution range-azimuth imaging. In addition, an adaptive QR decomposition denoising method for sparse array signals based on iterative low-rank matrix approximation (LRMA) and regularized QR is proposed to preprocess sparse motion array signals. Simulations and experiments show that on a two-transmitter-four-receiver array, the signal-to-noise ratio (SNR) of the sparse motion array signal after noise suppression via adaptive QR decomposition can exceed 0 dB, and the azimuth ambiguity signal ratio (AASR) can be reduced to below −20 dB.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"50 ","pages":"Pages 254-271"},"PeriodicalIF":5.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0