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中国科学院微电子研究所专利：一种Sigma-Delta调制器及模数转换器
中国科学院半导体研究所半导体超晶格国家重点实验室高速图像传感及信息处理课题组的刘力源研究员等研制出一款低功耗、高性能 Delta-Sigma调制器。相关研究成果以题目为 “A Discrete-Time Audio Modulator Using Dynamic Amplifier With Speed Enhancement and Flicker Noise Reduction Techniq...
Quantitative Study of High Dynamic Range Sigma Delta-based Focal Plane Array Architectures
IR focal plane array ROIC high dynamic range vertical integration sigma-delta extended counting
2015/8/17
The paper investigates the suitability of Σ∆ modulation based FPA readout schemes for use in Vertically Interconnected Sensor Arrays requiring ultra high dynamic range and frame rate. It is show...
On Incremental Sigma-Delta Modulation with Optimal Filtering
Sigma-Delta (Σ∆ ) incremental A/D converter optimal filter Σ∆ transfer function time-domain analysis
2015/8/12
The paper presents a quantization-theoretic framework for studying incremental Σ∆ data conversion systems. The framework makes it possible to efficiently compute the quantization intervals and h...
LAAS Sigma-Mean Monitor Analysis and Failure-Test Verification
LAAS Sigma-Mean Monitor Analysis Failure-Test Verification
2015/6/29
The Local Area Augmentation System (LAAS) is a ground-based differential GPS system being developed to support aircraft precision approach and landing navigation with guaranteed integrity. Stanford Un...
Sigma Overbounding using a Position Domain Method for the Local Area Augmentaion of GPS
Sigma Overbounding Position Domain Method Local Area Augmentaion GPS
2015/6/25
The local area augmentation system (LAAS) is a differential GPS navigation system being developed to support aircraft precision approach and landing navigation with guaranteed integrity and availabili...
Power Efficient Continuous-Time Delta-Sigma Modulator Architectures for Wideband Analog to Digital Conversion
Analog-to-Digital Conversion CMOS Integrated Circuit Continuous-Time Delta-Sigma Modulator Low-Power Wideband
2014/11/7
This work presents novel continuous-time delta-sigma modulator architectures with low-power consumption and improved signal transfer functions which are suitable for wideband A/D conversion in wireles...
Sigma-Delta微加速度计非理想因素建模与系统级设计
微加速度计 Sigma-Delta 系统级建模 非理想因素
2014/4/28
为了简化Sigma-Delta(ΣΔ)微加速度计接口电路晶体管级的仿真和优化，建立了系统中的非理想因素模型，并在此基础上完成了一种单环结构的ΣΔ微加速度计的系统级设计。分析了敏感结构中固定极板运动、时钟抖动、开关热噪声、运算放大器噪声等非理想因素对系统的影响，并分别建立了Simulink模型。基于所建模型，设计了一种ΣΔ微加速度计的精确的Simulink模型。系统级仿真结果表明：二阶系统的信号-噪...
Robust Iterated Sigma Point FastSLAM Algorithm for Mobile Robot Simultaneous Localization and Mapping
mobile robot simultaneous localization mapping (SLAM)
2011/8/4
Simultaneous localization and mapping (SLAM) is a key technology for mobile robots operating under unknown environment. While FastSLAM algorithm is a popular solution to the SLAM problem, it suffers f...
Robust Iterated Sigma Point FastSLAM Algorithm for Mobile Robot Simultaneous Localization and Mapping
mobile robot simultaneous localization mapping (SLAM)
2011/8/4
Simultaneous localization and mapping (SLAM) is a key technology for mobile robots operating under unknown environment. While FastSLAM algorithm is a popular solution to the SLAM problem, it suffers f...
SIGMA: Spatial Integrated Matching Association Algorithm for Logo Detection
Spatial Integrated Matching Association Algorithm Logo Detection
2010/12/21
In this paper, we adopt the integration model of spatial feature correlations to order the indexing and matching features, and address the computational ineffectiveness and
inefficiency of local fea...
研究了一种鲁棒Sigma-point滤波方法在无人机编队相对导航问题上的应用。该方法采用Huber估计方法，将Sigma-point滤波量测更新转化为求解线性回归问题，新的Sigma-point滤波方法是一种混合L1、L2范数最小估计，当量测噪声为受污染的高斯白噪声时，该方法具有一定的鲁棒性。给出了编队无人机相对惯导方程和相对视线矢量测量原理，应用鲁棒Sigma-point滤波方法融合相对惯导信息...
数字滤波器在sigma-delta ADC芯片中占据了大部分芯片面积，该文提出了一种数字滤波器结构，这种结构滤波器采用一个控制单元和一个加法器取代了Hogenauer结构滤波器中差分器的多个加法器，从而减小数字电路的面积。一个采用这种结构的4阶的数字滤波器在CYCLONE II FPGA芯片中被实现，耗费的硬件资源比Hogenauer结构的滤波器减少近29%。
Sigma Set: A Small Second Order Statistical Region Descriptor
Sigma Set Statistical Region Descriptor
2010/12/20
Given an image region of pixels, second order statistics can be used to construct a descriptor for object representation. One example is the covariance matrix descriptor, which shows high discriminati...
基于迭代sigma点粒子滤波的再入目标跟踪
sigma点粒子滤波 迭代卡尔曼滤波 目标跟踪
2009/11/3
标准粒子滤波提议分布选择时，由于没有计入最近的观测值信息，重要性权的方差随时间递增，导致权值蜕化。针对这一问题提出了一种新的滤波算法，迭代sigma点粒子滤波算法。该算法在预测时采用sigma点粒子滤波产生拟合概率密度函数的加权粒子，并通过观测值对加权粒子进行更新；修正过程采用迭代卡尔曼滤波优化预测阶段得到的描述状态分布的均值和方差。将其运用于再入大气层目标的跟踪模型，仿真结果表明：与标准粒子滤波...