This paper simply discusses the outer channels and their characteristics of information communication between the fuze and outer environments based on the view that the fuze is an information system, and deeply analyz...This paper simply discusses the outer channels and their characteristics of information communication between the fuze and outer environments based on the view that the fuze is an information system, and deeply analyzes the information features of high frequency signal processing that mainly recovers the echo signals and controls the noises instead of picking up the required target information. But it can reduce the uncertainty of the signal caused by noise. The information processing of fuze is mainly completed by the low frequency information processing system.展开更多
In order to extract the feature information of ultra wide-band (UWB) radio fuze target and give full play to the warhead's strike ability, a method based on polar Hough transform for scattering centers extraction ...In order to extract the feature information of ultra wide-band (UWB) radio fuze target and give full play to the warhead's strike ability, a method based on polar Hough transform for scattering centers extraction of the target was proposed in this paper. It firstly utilized the fuze scanning to obtain the distance and azimuth information of the target's main scattering centers at different times, i.e. the track information of scattering centers under the polar coordinates, then used the polar Hough transform to transform the track into the parameter space in order to accumulate the dots and drew 3-D parameter space diagram, in which the peak points corresponded to the target's scattering centers. The simulation results indicate that the method can not only extract scattering centers efficiently and accurately, but also has strong anti-noise performance, and the algorithm is simple and easy to be implemented in engineering.展开更多
随着无线通信技术的快速演进,5G、Wi-Fi和窄带物联网(Narrowband internet of things,NB-IoT)等多种通信制式并存,网络结构与信道环境的复杂性显著提升,使通信制式识别在频谱管理、干扰抑制与安全监测中的作用愈加重要。传统依赖人工特...随着无线通信技术的快速演进,5G、Wi-Fi和窄带物联网(Narrowband internet of things,NB-IoT)等多种通信制式并存,网络结构与信道环境的复杂性显著提升,使通信制式识别在频谱管理、干扰抑制与安全监测中的作用愈加重要。传统依赖人工特征与规则的方法在动态复杂场景及未知协议下适应性有限,而深度学习通过端到端建模与自动特征提取显著提升了识别精度与鲁棒性,但其在跨制式泛化、数据稀缺与计算开销方面仍面临瓶颈。以大语言模型与多模态模型为代表的大规模预训练模型凭借强泛化、跨任务迁移和少样本学习能力,展现出在复杂通信制式识别中的巨大潜力。本文系统梳理了通信制式识别技术的发展脉络,重点探讨了大语言模型驱动方法的最新进展,剖析了其在泛化能力、可解释性与高效部署等方面所面临的挑战,挖掘了其在智能频谱管理与安全监测中的应用机遇,并展望了其在5G/6G智能网络管理中的发展前景。展开更多
室内人员检测技术是无线感知的前提和基础,其应用场景非常广泛。为了有效区分室内存在动态人员的场景和室内存在静态人员的场景,使用细粒度高的CSI(Channel State Information)相位差信息作为无线感知的基信号。相位差信息同时利用了频...室内人员检测技术是无线感知的前提和基础,其应用场景非常广泛。为了有效区分室内存在动态人员的场景和室内存在静态人员的场景,使用细粒度高的CSI(Channel State Information)相位差信息作为无线感知的基信号。相位差信息同时利用了频率分集和空间分集协同作用,蕴含着更多微小运动的信息。由于相位存在相位模糊和初始相位偏移,导致相位差序列存在多路独立时间序列的问题,从CSI相位数据某时刻单个数据包角度,根据相位模糊和初始相位偏移导致多路时间序列的原因,提出一种相位差矫正算法去除相位模糊和初始相位偏移的影响并用相位差进行人员检测。在被动式室内人员检测中,动态人员检测平均准确率达到98.85%左右,静态人员检测平均准确率达到95.99%左右,因为提取的特征是物理上合理且与环境无关的人体运动速度特征和静态人体呼吸特征,对环境和时间动态具有一定的鲁棒性。实验表明,所提出的相位差矫正算法能有效矫正相位差,去除相位模糊和初始相位偏移的影响。基于相位差的人员检测能实现较高的准确率。展开更多
Analyzed the relation between time delay difference and time delay estimation errors, based on the principles of three-point locating, a reformed threshold method for time delay difference estimation of impulse signal...Analyzed the relation between time delay difference and time delay estimation errors, based on the principles of three-point locating, a reformed threshold method for time delay difference estimation of impulse signals, called as amendment estimation for short, is developed by introducing channel equalization technique to its conventional version, named as direct estimation in this paper, to improve the estimation stability. After inherent relationship between time delay and phase shift of signals is analyzed, an integer period error compensation method utilized the diversities of both contribution share and contribution mode of concerned estimates is proposed under the condition of high precision phase lag estimation. Finally, a cooperative multi-threshold estimation method composed of amendment and direct estimations to process impulse signals with three thresholds is established. In sea trials data tests of passive locating, this method improves the estimation precision of time delay difference efficiently. The experiments verify the theoretical predictions.展开更多
针对夜间场景下低照度图像整体亮度不足、边缘难以辨识与色彩失真等问题,在HSV色彩空间的基础上,提出一种基于多尺度自引导锐化-平滑图像滤波(Sharpening-Smoothing Image Fil⁃ter,SSIF)的低照度图像增强方法.首先,利用HSV空间色彩亮度...针对夜间场景下低照度图像整体亮度不足、边缘难以辨识与色彩失真等问题,在HSV色彩空间的基础上,提出一种基于多尺度自引导锐化-平滑图像滤波(Sharpening-Smoothing Image Fil⁃ter,SSIF)的低照度图像增强方法.首先,利用HSV空间色彩亮度分离的特性,对V分量使用多尺度自引导锐化-平滑图像滤波,准确估计光照分量进而求得精确的反射分量.其次,针对光照分量分布不均的问题,提出一种二维自适应伽马变换算法并通过大量对比选取最佳参数,对较暗区域亮度进行拉伸,同时抑制较亮区域的亮度,使整体图像光照更加均匀,图像亮度更符合人眼视觉.再次,针对反射分量存在部分边缘模糊与噪声的问题,提出多尺度钝化掩蔽算法,在抑制噪声的同时能够有效增强图像细节信息,提升整体图像动态范围.最后,对S分量使用自适应饱和度增强算法,将增强后的S分量、V分量与保持不变的H分量合并转到RGB图像,并与带色彩恢复的多尺度视网膜增强算法(Multi-Scale Retinex with Color Restoration,MSRCR)中的色彩恢复因子结合得到最终增强图像.实验结果表明:所提低照度图像增强算法的基于精细自然场景统计的图像质量盲评价指标和平均梯度较其他对比算法分别提高了14.62%、32.10%,不仅能够有效地解决图像亮度分布不均问题,而且能够提高图像轮廓细节的丰富程度和对比度,整体效果优于其他对比算法.展开更多
To objectively obtain the three-dimensional coordinates of the projectile fuze proximity explosion when projectile intersects the head of missile target, we propose a dynamic seven photoelectric detection screen test ...To objectively obtain the three-dimensional coordinates of the projectile fuze proximity explosion when projectile intersects the head of missile target, we propose a dynamic seven photoelectric detection screen test method, which is made up of six plane detection screens and a flash photoelectric dynamic detection screen. The three-dimensional coordinates calculation model of the projectile proximity explosion position based on seven plane detection screens with dynamic characteristics is established.According to the relation of the dynamic seven photoelectric detection screen planes and the time values,the analytical function of the projectile proximity explosion position parameters under non-linear motion is derived. The projectile signal filtering method based on discrete wavelet transform is explored in this work. Additionally, the projectile signal recognition algorithm using an improved particle swarm is proposed. Based on the characteristics of the time duration and the signal peak error for the projectile passing through the detection screen, the signals attribution of the same projectile passing through six detection screens are analyzed for obtaining precise time values of the same projectile passing through the detection screens. On the basis of the projectile fuze proximity explosion test, the linear motion model and the proposed non-linear motion model are used to calculate and compare the same group of projectiles proximity explosion position parameters. The comparison of test results verifies that the proposed test method and calculation model in this work accurately obtain the actual projectile proximity explosion position parameters.展开更多
文摘This paper simply discusses the outer channels and their characteristics of information communication between the fuze and outer environments based on the view that the fuze is an information system, and deeply analyzes the information features of high frequency signal processing that mainly recovers the echo signals and controls the noises instead of picking up the required target information. But it can reduce the uncertainty of the signal caused by noise. The information processing of fuze is mainly completed by the low frequency information processing system.
文摘In order to extract the feature information of ultra wide-band (UWB) radio fuze target and give full play to the warhead's strike ability, a method based on polar Hough transform for scattering centers extraction of the target was proposed in this paper. It firstly utilized the fuze scanning to obtain the distance and azimuth information of the target's main scattering centers at different times, i.e. the track information of scattering centers under the polar coordinates, then used the polar Hough transform to transform the track into the parameter space in order to accumulate the dots and drew 3-D parameter space diagram, in which the peak points corresponded to the target's scattering centers. The simulation results indicate that the method can not only extract scattering centers efficiently and accurately, but also has strong anti-noise performance, and the algorithm is simple and easy to be implemented in engineering.
文摘随着无线通信技术的快速演进,5G、Wi-Fi和窄带物联网(Narrowband internet of things,NB-IoT)等多种通信制式并存,网络结构与信道环境的复杂性显著提升,使通信制式识别在频谱管理、干扰抑制与安全监测中的作用愈加重要。传统依赖人工特征与规则的方法在动态复杂场景及未知协议下适应性有限,而深度学习通过端到端建模与自动特征提取显著提升了识别精度与鲁棒性,但其在跨制式泛化、数据稀缺与计算开销方面仍面临瓶颈。以大语言模型与多模态模型为代表的大规模预训练模型凭借强泛化、跨任务迁移和少样本学习能力,展现出在复杂通信制式识别中的巨大潜力。本文系统梳理了通信制式识别技术的发展脉络,重点探讨了大语言模型驱动方法的最新进展,剖析了其在泛化能力、可解释性与高效部署等方面所面临的挑战,挖掘了其在智能频谱管理与安全监测中的应用机遇,并展望了其在5G/6G智能网络管理中的发展前景。
文摘室内人员检测技术是无线感知的前提和基础,其应用场景非常广泛。为了有效区分室内存在动态人员的场景和室内存在静态人员的场景,使用细粒度高的CSI(Channel State Information)相位差信息作为无线感知的基信号。相位差信息同时利用了频率分集和空间分集协同作用,蕴含着更多微小运动的信息。由于相位存在相位模糊和初始相位偏移,导致相位差序列存在多路独立时间序列的问题,从CSI相位数据某时刻单个数据包角度,根据相位模糊和初始相位偏移导致多路时间序列的原因,提出一种相位差矫正算法去除相位模糊和初始相位偏移的影响并用相位差进行人员检测。在被动式室内人员检测中,动态人员检测平均准确率达到98.85%左右,静态人员检测平均准确率达到95.99%左右,因为提取的特征是物理上合理且与环境无关的人体运动速度特征和静态人体呼吸特征,对环境和时间动态具有一定的鲁棒性。实验表明,所提出的相位差矫正算法能有效矫正相位差,去除相位模糊和初始相位偏移的影响。基于相位差的人员检测能实现较高的准确率。
文摘Analyzed the relation between time delay difference and time delay estimation errors, based on the principles of three-point locating, a reformed threshold method for time delay difference estimation of impulse signals, called as amendment estimation for short, is developed by introducing channel equalization technique to its conventional version, named as direct estimation in this paper, to improve the estimation stability. After inherent relationship between time delay and phase shift of signals is analyzed, an integer period error compensation method utilized the diversities of both contribution share and contribution mode of concerned estimates is proposed under the condition of high precision phase lag estimation. Finally, a cooperative multi-threshold estimation method composed of amendment and direct estimations to process impulse signals with three thresholds is established. In sea trials data tests of passive locating, this method improves the estimation precision of time delay difference efficiently. The experiments verify the theoretical predictions.
文摘针对夜间场景下低照度图像整体亮度不足、边缘难以辨识与色彩失真等问题,在HSV色彩空间的基础上,提出一种基于多尺度自引导锐化-平滑图像滤波(Sharpening-Smoothing Image Fil⁃ter,SSIF)的低照度图像增强方法.首先,利用HSV空间色彩亮度分离的特性,对V分量使用多尺度自引导锐化-平滑图像滤波,准确估计光照分量进而求得精确的反射分量.其次,针对光照分量分布不均的问题,提出一种二维自适应伽马变换算法并通过大量对比选取最佳参数,对较暗区域亮度进行拉伸,同时抑制较亮区域的亮度,使整体图像光照更加均匀,图像亮度更符合人眼视觉.再次,针对反射分量存在部分边缘模糊与噪声的问题,提出多尺度钝化掩蔽算法,在抑制噪声的同时能够有效增强图像细节信息,提升整体图像动态范围.最后,对S分量使用自适应饱和度增强算法,将增强后的S分量、V分量与保持不变的H分量合并转到RGB图像,并与带色彩恢复的多尺度视网膜增强算法(Multi-Scale Retinex with Color Restoration,MSRCR)中的色彩恢复因子结合得到最终增强图像.实验结果表明:所提低照度图像增强算法的基于精细自然场景统计的图像质量盲评价指标和平均梯度较其他对比算法分别提高了14.62%、32.10%,不仅能够有效地解决图像亮度分布不均问题,而且能够提高图像轮廓细节的丰富程度和对比度,整体效果优于其他对比算法.
基金supported by Project of the National Natural Science Foundation of China (No.62073256, 61773305)the Key Science and Technology Program of Shaanxi Province (No.2020GY-125)Xi’an Science and Technology Innovation talent service enterprise project (No.2020KJRC0041)。
文摘To objectively obtain the three-dimensional coordinates of the projectile fuze proximity explosion when projectile intersects the head of missile target, we propose a dynamic seven photoelectric detection screen test method, which is made up of six plane detection screens and a flash photoelectric dynamic detection screen. The three-dimensional coordinates calculation model of the projectile proximity explosion position based on seven plane detection screens with dynamic characteristics is established.According to the relation of the dynamic seven photoelectric detection screen planes and the time values,the analytical function of the projectile proximity explosion position parameters under non-linear motion is derived. The projectile signal filtering method based on discrete wavelet transform is explored in this work. Additionally, the projectile signal recognition algorithm using an improved particle swarm is proposed. Based on the characteristics of the time duration and the signal peak error for the projectile passing through the detection screen, the signals attribution of the same projectile passing through six detection screens are analyzed for obtaining precise time values of the same projectile passing through the detection screens. On the basis of the projectile fuze proximity explosion test, the linear motion model and the proposed non-linear motion model are used to calculate and compare the same group of projectiles proximity explosion position parameters. The comparison of test results verifies that the proposed test method and calculation model in this work accurately obtain the actual projectile proximity explosion position parameters.
