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一种可融合频差变化率的无源定位算法
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作者 王登林 裴泽霖 +1 位作者 田牧歌 张爽娜 《电子信息对抗技术》 北大核心 2022年第3期31-35,共5页
在时/频差双站无源定位中,窄带信号的到达时差估计误差较大会导致定位性能恶化。针对这一问题,提出梯度加权定位算法,该算法利用观测量对地理位置的敏感度作为加权系数,建立最大似然目标函数,可将多个观测量进行加权融合,由此引入频差... 在时/频差双站无源定位中,窄带信号的到达时差估计误差较大会导致定位性能恶化。针对这一问题,提出梯度加权定位算法,该算法利用观测量对地理位置的敏感度作为加权系数,建立最大似然目标函数,可将多个观测量进行加权融合,由此引入频差变化率以增加观测的Fisher信息。仿真结果表明,对于窄带信号,该算法相对于传统的时/频差定位算法具有更高的精度,与Hough算法相比具有更小的搜索量,能有效提升对窄带辐射源的综合定位性能。 展开更多
关键词 无源定位 到达时差 到达频差 到达频差变化率
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Analysis of Urban Greening of Tai'an City in China Based on Remote Sensing Image with High Resolution
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作者 HAN Lingling FEI Xianyun tian muge 《Journal of Landscape Research》 2012年第9期55-57,60,共4页
By taking urban greening of Tai'an City of Shandong Province for example,selecting remote sensing image Quickbird with high resolution,and combining visual interpretation with automatic classification of the compu... By taking urban greening of Tai'an City of Shandong Province for example,selecting remote sensing image Quickbird with high resolution,and combining visual interpretation with automatic classification of the computer,based on urban green space systematic planning map,green space information of the built-up area has been selected for the research centering on green lands in urban parks,productive green lands,green lands attached to residential areas and units,green lands attached to the road,other green lands,water surfaces and so on.Through the statistics and analysis,the distribution condition of each type of urban green land has been obtained,and some suggestions have been proposed in view of existing problems of urban greening.It should enhance the construction of green lands in urban parks,residential areas and units,improve road greening level,implement vertical greening,increase the area of productive green lands and fully make use of idle lands. 展开更多
关键词 URBAN green lands REMOTE sensing image with high RESOLUTION QUICKBIRD Tai’an CITY
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