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Flow fields estimation on the basis of a computational model of bionic-sonar

基于仿生声纳计算模型的流场估计

基本信息

批准号：
06650456
负责人：
MITSUHASHI Wataru
金额：
$ 1.47万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650456/
关键词：
Echo location Bionic sonar Doppler effect Binaural reception Parameter estimation Downward swept FM Phase sensitive model コウモリの生体ソナー超音波計測

项目摘要

A bank of filters with constant Q is adopted as an optimum receiver for target parameter estimation, representing the frequency selective mechanisms in the mammalian auditory periphery. The investigator assumes that the phase value of the output from each filter represents a neural firing locked on a specific phase value of received sounds. On this assumption, an estimate of the propagation delay to a moving target is obtained from the time of the largest firing rate, while the phase value that most of the neurons respond to at the instant of the largest firing rate provides an estimate of target velocity.In the final year of this investigation, experiments for target parameter estimation in two dimensional space were carried out in air by using four receivers and a transmitter. In such the two dimensional case, Jeffress model is known as a mechanism for detecting the interaural time difference (ITD) in binaural reception. A maximum likelihood estimates for range and direction of a moving target are calculated based on the ITD.In velocity vector estimation, a radial velocity component can be estimated by the maximum likelihood method with the phase value obtained from the largest firing rates, whereas an angular velocity component has a relative large error because it is calculated by differentiating the binaural phase values. Further improvements must be made on the algorithm for velocity vector estimation.

采用一组Q值恒定的滤波器作为目标参数估计的最优接收器，代表了哺乳动物听觉外围的频率选择机制。研究者假设每个滤波器输出的相位值代表了一个锁定在接收声音的特定相位值上的神经放电。在此假设下，对运动目标的传播延迟的估计是从最大发射速率的时间得到的，而在最大发射速率的瞬间，大多数神经元响应的相位值提供了对目标速度的估计。在本研究的最后一年，利用四个接收机和一个发射机在空中进行了二维空间目标参数估计的实验。在这种二维情况下，Jeffress模型被称为双耳接收中耳间时差（ITD）的检测机制。根据过渡段计算出运动目标的距离和方向的最大似然估计。在速度矢量估计中，径向速度分量可以用最大射速得到的相位值来估计，而角速度分量由于是通过微分双耳相位值来计算的，因此误差相对较大。速度矢量估计算法有待进一步改进。