针对现有斜视多子阵合成孔径声呐成像算法忽略了"非停走停"假设的孔径依赖性和阵元依赖性,导致中等斜视时成像效果差的问题,提出了一种基于级数反演方法(Method of Series Reversion, MSR)的中等斜视多子阵合成孔径声呐距离...针对现有斜视多子阵合成孔径声呐成像算法忽略了"非停走停"假设的孔径依赖性和阵元依赖性,导致中等斜视时成像效果差的问题,提出了一种基于级数反演方法(Method of Series Reversion, MSR)的中等斜视多子阵合成孔径声呐距离多普勒算法(Range Doppler Algorithm, RDA)。首先,为了解决"非停走停"假设孔径依赖的问题,直接对精确距离史在波束中心处进行泰勒级数展开,得到近似距离史,并借用MSR求得近似距离史对应窄带回波信号的二维谱解析解。然后,为了解决阵元依赖的问题,使用基于MSR的RDA分别对每个子阵单独成像,再通过将每个子阵的成像结果进行相干叠加的方式消除单个子阵欠采样带来的混叠现象,得到完整的成像结果。最后,通过与现有算法的仿真对比实验,验证了该算法的有效性。展开更多
The bistatic Synthetic Aperture Radar (SAR) systems with separate transmitter and receiver antennas provide a new potential to imaging in the forward-looking geometry. Analysis of the Doppler property in this paper in...The bistatic Synthetic Aperture Radar (SAR) systems with separate transmitter and receiver antennas provide a new potential to imaging in the forward-looking geometry. Analysis of the Doppler property in this paper indicates the feasibility of Bistatic Forward-Looking (BFL) SAR imaging. Considering the different Doppler property determined by the two platforms in BFL SAR, a new 2-D point target spectrum is derived in our study. Based on the spectrum, an imaging method is chosen for the configuration, and the point target simulation validates the analysis.展开更多
为优化整个虚拟发电厂（virtual power plant，VPP）内部分布式发电资源（distributed energy resources，DER）的调度成本。基于VPP的多代理结构形式建立了VPP内部DER的均衡调度模型，以实时满足系统负荷需求为条件，利用模仿者动态算...为优化整个虚拟发电厂（virtual power plant，VPP）内部分布式发电资源（distributed energy resources，DER）的调度成本。基于VPP的多代理结构形式建立了VPP内部DER的均衡调度模型，以实时满足系统负荷需求为条件，利用模仿者动态算法处理VPP内部调度资源分配问题。通过分析不同种类DER的适应度系数与可调容量，提出多方共赢的VPP内部DER的均衡调度策略：适应度系数越小（即调用成本越低1、可调容量越大的DER参与调度的机会越多，反之越少。算例分析证明了所提模型和算法的合理性和有效性。与传统基于市场机制的VPP调度方法相比，模仿者动态算法在解决VPP内部DER调度问题方面能有效控制调度成本，同时具有简便、易拓展的特点。展开更多
A concept of space-surface bistatic synthetic aperture radar (SS-BSAR) passive imaging system is proposed,which is parasitic on the signal of COMPASS Navigation Satellite System (CNSS).The feasibility is demonstrated ...A concept of space-surface bistatic synthetic aperture radar (SS-BSAR) passive imaging system is proposed,which is parasitic on the signal of COMPASS Navigation Satellite System (CNSS).The feasibility is demonstrated by analyzing the signal ambiguity function and the range resolution as well as the system topology.Due to the multiple peaks of signal in the auto-correlation function,a new correlation is used to remove the side-peaks.A double-channel receiver is employed to receive the direct satellite signal and the ground reflected signal.The direct signal is a reference signal in range compression,and may also be used for transmitter-receiver signal synchronization.The reflected signal is raw data collected for imaging.Then,a modified range-Doppler imaging algorithm is derived based on the system geometric models and BSAR imaging principle.The proposed algorithm is verified via signal simulation.The work in this paper is of great value to the further use of COMPASS signal,as well as other global navigation satellite signals in passive imaging.展开更多
文摘针对现有斜视多子阵合成孔径声呐成像算法忽略了"非停走停"假设的孔径依赖性和阵元依赖性,导致中等斜视时成像效果差的问题,提出了一种基于级数反演方法(Method of Series Reversion, MSR)的中等斜视多子阵合成孔径声呐距离多普勒算法(Range Doppler Algorithm, RDA)。首先,为了解决"非停走停"假设孔径依赖的问题,直接对精确距离史在波束中心处进行泰勒级数展开,得到近似距离史,并借用MSR求得近似距离史对应窄带回波信号的二维谱解析解。然后,为了解决阵元依赖的问题,使用基于MSR的RDA分别对每个子阵单独成像,再通过将每个子阵的成像结果进行相干叠加的方式消除单个子阵欠采样带来的混叠现象,得到完整的成像结果。最后,通过与现有算法的仿真对比实验,验证了该算法的有效性。
基金Supported by the National Natural Science Foundation of China (No. 61071165)the Aviation Science Foundation (No. 20102052024)
文摘The bistatic Synthetic Aperture Radar (SAR) systems with separate transmitter and receiver antennas provide a new potential to imaging in the forward-looking geometry. Analysis of the Doppler property in this paper indicates the feasibility of Bistatic Forward-Looking (BFL) SAR imaging. Considering the different Doppler property determined by the two platforms in BFL SAR, a new 2-D point target spectrum is derived in our study. Based on the spectrum, an imaging method is chosen for the configuration, and the point target simulation validates the analysis.
文摘为优化整个虚拟发电厂（virtual power plant，VPP）内部分布式发电资源（distributed energy resources，DER）的调度成本。基于VPP的多代理结构形式建立了VPP内部DER的均衡调度模型，以实时满足系统负荷需求为条件，利用模仿者动态算法处理VPP内部调度资源分配问题。通过分析不同种类DER的适应度系数与可调容量，提出多方共赢的VPP内部DER的均衡调度策略：适应度系数越小（即调用成本越低1、可调容量越大的DER参与调度的机会越多，反之越少。算例分析证明了所提模型和算法的合理性和有效性。与传统基于市场机制的VPP调度方法相比，模仿者动态算法在解决VPP内部DER调度问题方面能有效控制调度成本，同时具有简便、易拓展的特点。
基金supported by the National Basic Research Program of China (Grant No.2011CB707001)
文摘A concept of space-surface bistatic synthetic aperture radar (SS-BSAR) passive imaging system is proposed,which is parasitic on the signal of COMPASS Navigation Satellite System (CNSS).The feasibility is demonstrated by analyzing the signal ambiguity function and the range resolution as well as the system topology.Due to the multiple peaks of signal in the auto-correlation function,a new correlation is used to remove the side-peaks.A double-channel receiver is employed to receive the direct satellite signal and the ground reflected signal.The direct signal is a reference signal in range compression,and may also be used for transmitter-receiver signal synchronization.The reflected signal is raw data collected for imaging.Then,a modified range-Doppler imaging algorithm is derived based on the system geometric models and BSAR imaging principle.The proposed algorithm is verified via signal simulation.The work in this paper is of great value to the further use of COMPASS signal,as well as other global navigation satellite signals in passive imaging.
