【摘 要】
:
The bias estimation of passive sensors is considered based on information fusion in multi-platform multi-sensor tracking system. The unobservable problem of bearing-only tracking in blind spot is analyzed. A modified maximum likelihood method, which uses
【机 构】
:
SchoolofElectronic,InformationandElectricalEngineering,ShanghaiJiaoTongUniversity,Shanghai200030Inst
【出 处】
:
ChineseOpticsLetters
论文部分内容阅读
The bias estimation of passive sensors is considered based on information fusion in multi-platform multi-sensor tracking system. The unobservable problem of bearing-only tracking in blind spot is analyzed. A modified maximum likelihood method, which uses the redundant information of multi-sensor system to calculate the target position, is investigated to estimate the biases. Monte Carlo simulation results show that the modified method eliminates the effect of unobservable problem in the blind spot and can estimate the biases more rapidly and accurately than maximum likelihood method. It is statistically efficient since the standard deviation of bias estimation errors meets the theoretical lower bounds.
其他文献
We report an observation of the second-order correlation between twin beams generated by amplified spontaneous parametric down-conversion operating above threshold with kilowatt-level peak power, from a periodically poled LiTaO3 crystal via a s
提出了一种新颖的光纤布拉格光栅(FBG)倾斜传感器设计,采用4根反射波长不同的FBG,该结构更简单和稳定,可用来测量平面内两维方向的倾斜角度,具有高灵敏性和测量精度,且无需附加的温度补偿装置即可消除环境温度的影响。初步的实验结果证实了该设计的可行性,表明此倾斜传感器的角度准确度和精度非常好,可以达到约0.3°的精度。需要强调的是,此倾斜传感器的性能还可进一步提高,通过增加悬垂物重量,或减小每对光纤
针对双光束光阱轴向光阱刚度小、捕获稳定性差的缺点,提出利用四光束光阱捕获和操控微粒。采用射线模型对比分析了双光束光阱与四光束光阱在力学特征上的差异,设计制备了四光束光阱芯片。用其捕获半径为5 μm的聚苯乙烯微球,并采用均方位移法对其轴向光阱刚度进行标定。仿真和实验结果均表明,四光束光阱中轴向光阱的刚度与双光束光阱的横向光阱刚度相当,且远大于双光束光阱的轴向光阱刚度。四光束光阱在保持双光束光阱横向捕获稳定性的同时,提高了轴向捕获稳定性,对微纳颗粒的稳定操控有重要意义。
A novel optical fiber hydrogen sensing system based on palladium (Pd) and sliver (Ag) is proposed. By direct current (DC) magnetron process, Pd/Ag alloy ultra-thin films were deposited on the substrate to eliminate the hydrogen embrittlement of sensor bas
由Van Cittert-Zernike提出的部分相干光定理出发,研究了大功率垂直腔面发射激光器(VCSEL)及其列阵器件的空间相干特性。采用杨氏双缝干涉实验装置得到980 nm波段VCSEL单管器件的干涉条纹图样,再将干涉图样转换进行灰度读取处理得到光强分布图样,最后分别采用积分法和平均值法对光强图样进行计算,所得结果与由Van Cittert-Zernike定理所得的空间相干度理论值进行对比,并讨论了VCSEL器件发光孔径对其空间相干度的影响。实验结果表明提出的积分法计算出的空间相干度与理论值的误差在
High signal-to-noise surface enhanced Raman scattering (SERS) signal of rat serum was obtained in this article. Two methods were presented to enhance the intensity of rat serum SERS signal. The novel colloid silver was synthesized using heating method by
This Letter introduces the design and simulation of a microstrip-line-based electro-optic (EO) polymer optical phase modulator (PM) that is further enhanced by the addition of photonic crystal (PhC) structures that are in close proximity to the optical co
为了准确地描述人体骨骼的运动细节以及3D骨骼间的几何关系,提出一种基于四元数3D骨骼表示的人体行为识别方法。首先,在已捕获的关键帧集合的基础上,对普通关键帧和变速关键帧分别采用线性插值和二次多项式插值,获得相同帧数的骨骼序列;然后,针对所得的骨骼序列,采用四元数对每帧中3D骨骼间的几何关系进行描述,获得四元数骨骼特征描述子;最后,采用支持向量机分类器对这一系列特征描述子进行训练和测试,得到最终的识
设计了一种基于站立结构的太赫兹超材料增透膜。利用双开口环站立结构实现了对太赫兹波段反射的抑制,使得该增透膜的反射率最低减小至0.001,反射率在0.1以下的带宽可达0.45 THz。分析了该超材料增透膜的工作机理,研究了两个开口环之间的距离以及聚合物基底的厚度对超材料增透膜性能的影响,并与单开口环结构的增透膜进行了性能对比。仿真及分析结果表明,所设计的超材料增透膜具有优异的宽带反射抑制性能和较大的制作参数容差特性。