Position and velocity measurement for moving objects by pulse compression using M-sequence-coded ultrasound

2016 ◽  
Vol 140 (4) ◽  
pp. 3418-3418 ◽  
Author(s):  
Shinnosuke Hirata ◽  
Hiroyuki Hachiya
Keyword(s):  
Velocity Measurement ◽  
Pulse Compression ◽  
Moving Objects ◽  
M Sequence ◽  
Coded Ultrasound

scholarly journals Doppler Velocity Estimation of Overlapping Linear-Period-Modulated Ultrasonic Waves Based on an Expectation-Maximization Algorithm

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Natee Thong-un ◽  
Minoru K. Kurosawa
Keyword(s):  
Em Algorithm ◽  
Expectation Maximization ◽  
Pulse Compression ◽  
Moving Objects ◽  
Expectation Maximization Algorithm ◽  
Ultrasonic Waves ◽  
Velocity Estimation ◽  
Doppler Velocity ◽  
The Em Algorithm ◽  
Linear Period

The occurrence of an overlapping signal is a significant problem in performing multiple objects localization. Doppler velocity is sensitive to the echo shape and is also able to be connected to the physical properties of moving objects, especially for a pulse compression ultrasonic signal. The expectation-maximization (EM) algorithm has the ability to achieve signal separation. Thus, applying the EM algorithm to the overlapping pulse compression signals is of interest. This paper describes a proposed method, based on the EM algorithm, of Doppler velocity estimation for overlapping linear-period-modulated (LPM) ultrasonic signals. Simulations are used to validate the proposed method.

Velocity Measurement using the Fdoa Method in Ground-Based Radio Navigation System

2014 ◽  
Vol 21 (2) ◽  
pp. 363-376 ◽  
Author(s):  
Jarosław Sadowski
Keyword(s):  
Navigation System ◽  
Velocity Measurement ◽  
Moving Objects ◽  
Radio Networks ◽  
Position Estimation ◽  
Velocity Measurements ◽  
Radio Navigation ◽  
Wave Measurements ◽  
Radio Navigation System ◽  
Full Synchronization

Abstract Velocity is one of the main navigation parameters of moving objects. However some systems of position estimation using radio wave measurements cannot provide velocity data due to limitation of their performance. In this paper a velocity measurement method for the DS-CDMA radio navigation system is proposed, which does not require full synchronization of reference stations carrier frequencies. The article presents basics of FDOA (frequency difference of arrival) velocity measurements together with application of this method to an experimental radio navigation system called AEGIR and with some suggestions about the possibility to implement such FDOA measurements in other kinds of asynchronous DS-CDMA radio networks. The main part of this paper present results of performance evaluation of the proposed method, based on laboratory measurements

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