体积流量的超声测试方法

讨论超声体积流量测试中的时间差法和多普勒法。     

基于神经网络的TDOA定位改进算法研究

针对传统的Chan算法在实际的非视距环境中性能将会受到很大影响这一问题,提出了一种基于神经网络的TDOA定位改进算法,这种算法通过对非视距误差进行修正,使其具有更好的定位效果.仿真实验结果表明,与传统的Chan算法相比,这种算法具有更好的定位精度和收敛速度,是一种有效的定位算法.     

从时间差入手 巧解工程问题

正"铃铃铃……"上课铃声响了,又到了数学兴趣小组活动时间,六(1)班的李老师快步走进了教室。咦,真奇怪!杨老师怎么没来呢?在李老师的说明下,我们才知道杨老师因为有事,所以临时请他来教我们。     

基于到达时间差和频率差信息的机载无源定位方法

提出了一种利用到达频率差和到达时间差信息的机载无源定位方法,分析了定位算法在单次测量定位时的精度和可观测性,计算机仿真结果验证了该方法的正确性和有效性.     

Relationship between Chinese speech intelligibility and speech transmission index in rooms using dichotic listening

Speech intelligibility （SI） is an important index for the design and assessment of speech purpose hall. The relationship between Chinese speech intelligibility scores in rooms and speech transmission index （STI） under diotic listening condition was studied using monaural room impulse responses obtained from the room acoustical simulation software Odeon in previous paper. The present study employs the simulated binaural room impulse responses and auralization technique to obtain the subjective Chinese speech intelligibility scores using rhyme test. The relationship between Chinese speech intelligi-bility scores and STI is built and validated in rooms using dichotic （binaural） listening. The result shows that there is a high correlation between Chinese speech intelligibility scores and STI using dichotic listening. The relationship between Chinese speech intelligibility scores and STI under diotic and dichotic listening conditions is also analyzed. Compared with diotic listening, dichotic （binaural） listening （an actual listening situation） can improve 2.7dB signal-to-noise ratio for Mandarin Chinese speech intelligibility. STI method can predict and evaluate the speech intelligibility for Mandarin Chinese in rooms for dichotic （binaural） listening.     

离散时间疏散模型在建筑出口设计中的应用

针对单元疏散空间的疏散能力问题,提出了单元疏散空间(建筑物只有一个出口)的离散时间疏散模型.模型中考虑了人群密度对疏散能力的影响,改变以往把建筑出口疏散能力视为常数而带来的不能真实反应其疏散能力的状况.结果表明:初始疏散密度确定时,在不同的出口宽度下,C型疏散时间略小于L型疏散时间,这种时间差距随着出口宽度的减小而减小,计算结果与 Simulex 模拟得出的结果近似;建筑物的疏散能力与出口宽度之间呈非线性关系;根据滞留情况,可以确定建筑的最佳出口宽度.模型能够真实地反映出口疏散能力,研究结果可以用于建筑出口的性能化设计.     

一种基于时间差分与背景差分的运动目标检测方法

运动目标检测技术对于目标识别、跟踪和行为理解等后期处理有着重要意义.本文提出一种基于时间差分与背景差分的运动目标检测与背景更新算法.实验结果证明该方法适应能力与抗干扰能力较强,有一定的实际应用价值.     

基于单片机的声音导引自动定位系统设计

1理论算法分析距离远的接收器一定比距离近的接收器后接收到信号。如图1中当移动小车声源从OX线右侧开始运动后,实时判断A、B两点接收到的音频脉冲信号的时间差,当时间差为零时,说明声源到A、B两点的距离相同。同理可以利用接收器A、C图实1现移系动统声示源意离图目标Y方向的位置。     

Single link tracking scheme based on UWB localization

To investigate the low-complex and high-precise tracking method, a novel single link tracking scheme based on UWB localization is proposed. Two antenna arrays are settled at the fixed station (FS) to receive the UWB signal from mobile terminal (MT), one FS is enough for the proposed scheme to track the MT. The UWB multipath detection algorithm for time difference of arrival (TDOA) estimation is presented and TDOA is thus adopted to estimate angle of arrival (AOA), avoiding the synchronization and complicated beamforming for AOA. The impacts of localization errors, concluding multipath and non-line-of-sight (NLOS) errors are simulated for the proposed track scheme. It is demonstrated that the simulation curve can match the real target moving, and the feasibility of the proposed scheme is proved.