In this paper,we present a novel unimodular sequence design algorithm based on the coordinate descent(CD)algorithm,aimed at countering electronic surveillance(ES)systems based on cyclostationary analysis.Our algorithm...In this paper,we present a novel unimodular sequence design algorithm based on the coordinate descent(CD)algorithm,aimed at countering electronic surveillance(ES)systems based on cyclostationary analysis.Our algorithm not only provides resistance against cyclostationary analysis(CSA)but also maintains low integrated sidelobe(ISL)characteristics.Initially,we derive the expression of the cyclostationary feature(CSF)detector and simplify it into an iterative quadratic form.Additionally,we derive a quadratic form to ensure the similarity of the autocorrelation sidelobes.To balance the minimization of the detection probability and the ISL values,we introduce a Pareto scalar that transforms the multiobjective optimization problem into a convex combination of objective functions.This approach allows us to find an optimal trade-off between the two objectives.Finally,we propose a monotonic algorithm based on the CD algorithm to counter CSA analysis.This algorithm efficiently solves the optimization problem mentioned earlier.Numerical experiments are conducted to validate the correctness and effectiveness of our proposed algorithm.展开更多
[目的/意义]展现一个学科与其他学科之间知识吸收和知识扩散的完整过程,揭示学科知识发展的来龙去脉。[方法/过程]利用国际权威引文数据库Web of Science,依据Web of Science学科类别划分标准,以Information Science&Library Scien...[目的/意义]展现一个学科与其他学科之间知识吸收和知识扩散的完整过程,揭示学科知识发展的来龙去脉。[方法/过程]利用国际权威引文数据库Web of Science,依据Web of Science学科类别划分标准,以Information Science&Library Science(以下简称ISLS)为例,选择2006-2010年和2011-2015年两个时间段,建立三个数据集(施引文献集、原始文献集、被引文献集),利用双图叠加可视化的方式探析ISLS与其他学科在期刊层面的知识吸收过程;利用知识扩散广度、强度和速度三个指标揭示ISLS与其他学科之间知识扩散现状和发展趋势。[结果/结论]在两个阶段内,ISLS主要吸收期刊类群心理、教育、社会的知识,知识来源学科主要为计算机科学学和管理学,在相应时间段内,知识扩散广度与时间呈对数函数关系,知识扩散速度与时间呈指数函数关系,ISLS向其他学科的知识扩散强度呈幂率分布。展开更多
电池管理系统(BMS)是电动汽车能量管理的重要部分,它提供整车控制策略的重要参数。高精度的电池数据采集系统,是提高整车控制性能的重要因素。设计了一种基于英特赛尔公司ISL78600数据采集芯片的高精度数据采集系统,重点从电压采集电路...电池管理系统(BMS)是电动汽车能量管理的重要部分,它提供整车控制策略的重要参数。高精度的电池数据采集系统,是提高整车控制性能的重要因素。设计了一种基于英特赛尔公司ISL78600数据采集芯片的高精度数据采集系统,重点从电压采集电路,温度采集电路两方面设计。电压采集电路设计上,单体电压采集误差可以维持在±2.5 m V以内,总压采集误差不超过100 m V;温度电路采集设计采用低功耗模式,可以大大减少电池组的内部功耗。大量实验数据验证了本设计的可行性和优越性。展开更多
The multilayer satellite network has high spatial spectrum utilization, flexible networking, strong survivability, and diversified functions. The inter-satellite links(ISLs) and crosslayer ISLs(CLISLs) enable direct c...The multilayer satellite network has high spatial spectrum utilization, flexible networking, strong survivability, and diversified functions. The inter-satellite links(ISLs) and crosslayer ISLs(CLISLs) enable direct communication paths between satellites, which improves the spatial autonomy of the constellation. Due to the existence of perturbation, ISLs are affected for a long time, which impacts reliable inter-satellite transmission. The stability and complexity of ISL establishment are related to the static and dynamic characteristics of range and azimuth. This paper presents a model of ISLs in a perturbed multilayer constellation. Series of theoretical derivation, simulation, and numerical calculation are carried out. A more comprehensive multilayer constellation ISL model is obtained. The work of this paper provides some theoretical foundations for constellation networking research.展开更多
基金support of the National Natural Science Foundation of China under grant numbers 62101570 and 61901494financial support has played a crucial role in the successful completion of this research.
文摘In this paper,we present a novel unimodular sequence design algorithm based on the coordinate descent(CD)algorithm,aimed at countering electronic surveillance(ES)systems based on cyclostationary analysis.Our algorithm not only provides resistance against cyclostationary analysis(CSA)but also maintains low integrated sidelobe(ISL)characteristics.Initially,we derive the expression of the cyclostationary feature(CSF)detector and simplify it into an iterative quadratic form.Additionally,we derive a quadratic form to ensure the similarity of the autocorrelation sidelobes.To balance the minimization of the detection probability and the ISL values,we introduce a Pareto scalar that transforms the multiobjective optimization problem into a convex combination of objective functions.This approach allows us to find an optimal trade-off between the two objectives.Finally,we propose a monotonic algorithm based on the CD algorithm to counter CSA analysis.This algorithm efficiently solves the optimization problem mentioned earlier.Numerical experiments are conducted to validate the correctness and effectiveness of our proposed algorithm.
文摘[目的/意义]展现一个学科与其他学科之间知识吸收和知识扩散的完整过程,揭示学科知识发展的来龙去脉。[方法/过程]利用国际权威引文数据库Web of Science,依据Web of Science学科类别划分标准,以Information Science&Library Science(以下简称ISLS)为例,选择2006-2010年和2011-2015年两个时间段,建立三个数据集(施引文献集、原始文献集、被引文献集),利用双图叠加可视化的方式探析ISLS与其他学科在期刊层面的知识吸收过程;利用知识扩散广度、强度和速度三个指标揭示ISLS与其他学科之间知识扩散现状和发展趋势。[结果/结论]在两个阶段内,ISLS主要吸收期刊类群心理、教育、社会的知识,知识来源学科主要为计算机科学学和管理学,在相应时间段内,知识扩散广度与时间呈对数函数关系,知识扩散速度与时间呈指数函数关系,ISLS向其他学科的知识扩散强度呈幂率分布。
文摘电池管理系统(BMS)是电动汽车能量管理的重要部分,它提供整车控制策略的重要参数。高精度的电池数据采集系统,是提高整车控制性能的重要因素。设计了一种基于英特赛尔公司ISL78600数据采集芯片的高精度数据采集系统,重点从电压采集电路,温度采集电路两方面设计。电压采集电路设计上,单体电压采集误差可以维持在±2.5 m V以内,总压采集误差不超过100 m V;温度电路采集设计采用低功耗模式,可以大大减少电池组的内部功耗。大量实验数据验证了本设计的可行性和优越性。
基金supported by the National Natural Science Foundation of China (61525403)。
文摘The multilayer satellite network has high spatial spectrum utilization, flexible networking, strong survivability, and diversified functions. The inter-satellite links(ISLs) and crosslayer ISLs(CLISLs) enable direct communication paths between satellites, which improves the spatial autonomy of the constellation. Due to the existence of perturbation, ISLs are affected for a long time, which impacts reliable inter-satellite transmission. The stability and complexity of ISL establishment are related to the static and dynamic characteristics of range and azimuth. This paper presents a model of ISLs in a perturbed multilayer constellation. Series of theoretical derivation, simulation, and numerical calculation are carried out. A more comprehensive multilayer constellation ISL model is obtained. The work of this paper provides some theoretical foundations for constellation networking research.
