线性系统最小二乘滤波的递推算法

应用广义逆矩阵的理论,导出了无需事先提供待估计量的任何先验统计知识而能获得严格意义下的最小二乘滤波的递推算法。     

Parallel processing architecture of H.264 adaptive deblocking filters

In H.264, computational complexity and memory access of deblocking filters are variable, dependent on video contents. This paper proposes a VLSI architecture of deblocking filters with adaptive dynamic power, which avoids redundant computations and memory accesses by precluding the blocks that can be skipped. The vertical and horizontal edges are simultaneously processed in an advanced scan order to speed up the decoder. As a result, dynamic power of the proposed architecture can be reduced adaptively （up to about 89%） for different videos, and the off-chip memory access is improved when compared to previous designs. Moreover, the processing capability of the proposed architecture is in particular appropriate for real-time deblocking of high-definition television （HDTV, 1920× 1080 pixels/frame, 60 frames/s video signals） video operation at 62 MHz. Using the proposed architecture, power can be reduced by up to about 89% and processing time by from 25% to 81% compared with previous designs.     

基于 STM32 控制的平衡小车系统设计

为了响应节能环保、绿色出行倡议,缓解城市交通拥挤状况,提出一种基于 STM32F103C8T6 芯片控制的两轮平衡小车设计方案。以 MPU-6050 作为小车姿态传感器获取小车车体倾角和角速度,基于卡尔曼滤波算法对姿态传感器采集到的的数据进行滤波融合,利用霍尔编码器测量小车车轮转向和转速,运用 PID 算法对控制要求和采集的数据信息进行计算分析并输出控制 PWM,经由 TB6612 电机驱动模块驱动电机,实现小车自主平衡并具备一定的抗干扰能力。另外小车通过蓝牙模块与手机 APP 通信,可通过手机端控制小车前进、后 退、转弯等动作。     

基于UKF算法的电池荷电状态SOC估算研究

新能源汽车锂电池荷电状态是反映电池及电源系统的重要参数,为达到实时估算SOC目的,基于无迹卡尔曼滤波算法提出SOC估算解决方案。在MATLAB/Simulink环境中建立一阶Thevenin等效电路模型和无迹卡尔曼滤波算法,通过建立混合功率脉冲特性实验,辨析出不同SOC和温度对电池模型的影响参数,将辨析出来的参数代入到UKF算法中进行仿真实验。实验结果表明,该荷电状态估算具有较高的精准度。     

砂砾含水层成井工艺的反冲淘沙法

当前在砂砾含水层的成井工艺中,均采用常规程序。即在所设计的砂砾含水层部位,配置相应的滤管,滤管外仍采用缠丝,再包扎尼龙滤网。管外投填滤砂。用活塞提拉或空压抽水洗井。此为传统工艺。由于受传统工艺束缚,缺乏对砂砾含水层结构的具体分析。施工工艺的针对性、对策性欠妥。多数成井井阻大,产水效率低。笔者在施工中,改变传统理念。提出反冲淘砂法成井。取得极为理想的效果,且施工工艺简单,井阻系数小,绝大部分为超完善井,产水效果佳。可视作砂砾含水层成井之新工艺。     

基于SOC单片机的FFU风机变频调速控制器

提出一种基于SOC单片机的风机过滤器单元变频调速控制器的设计方案．采用SOC型单片机C8051F3 10作为主控制核心,利用数字化闭环控制技术,实现FFU风机的变频调速控制,对控制器的硬件和软件分别进行分析、设计、开发．测试结果表明,该控制器控制效果良好、性能稳定优越,适合推广应用．     

阻容元件温漂对低通有源滤波器的影响

滤波器是一个频率选择部件,它可以通过某些频率而抑制或衰减另外一些频率的信号,该文介绍了模拟滤波器的发展及类型,通过对模拟滤波器的设计,对低通有源滤波器采用的阻容元件随温度变化特性进行分析及模拟仿真,提出如何解决阻容元件温漂对频率响应及产品灵敏度精度的影响。     

Technical Reliability Assessment of the Actigraph GT1M Accelerometer

The purpose of this study was to determine the reliability of the Actigraph GT1M (Pensacola, FL, USA) accelerometer activity count and step functions. Fifty GT1M accelerometers were initialized to collect simultaneous acceleration counts and steps data using 15-sec epochs. All reliability testing was completed using a mechanical shaker plate to perform six different test conditions in Experiment 1 and 18 test conditions in Experiment 2. The overall intra- and inter-instrument reliability of the GT1M was CV_intra = 2.9% and CV_inter = 3.5% for counts and CV_intra = 1.1% and CV_inter = 1.2% for steps. No batch effects were evident in the 50 GT1Ms. The Actigraph GT1M accelerometer demonstrated good reliability for measuring both counts and steps. However, the ability of the GT1M to consistently detect acceleration at a given acceleration and frequency condition varied widely. Future studies clarifying the filtering limitations and the threshold necessary to detect the occurrence of movement are warranted.     

多抽样率信号处理理论及其应用研究

多抽样率信号处理是建立在单抽样率信号处理基础上的一类信号处理。在传输信号时,由于语音、图象、视频信号的抽样中心频率相差很大,所以需要以多种抽样频率来对信号采样来满足各种传输类型的需要。探讨了改变抽样频率的两种方式-抽取和插值的基本原理,着重探讨了整数倍抽取和内插在数字语音系统中的应用。     

光分组交换节点物理性能仿真

A graphical and visual simulation system for the study of optical packet switching(OPS)nodes is accomplished.With the simulation system,the effect on physical performance-bit error rate(BER)due to a variety of factors such as the crosstalk parameters of OPS nodes,number of cascaded OPS nodes,length of optical output buffer,traffic load and fluctuation of amplitude of optical signals are evaluated.Reliability of the simulation system is proved by the analytical results obtained in all the above cases.