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Publicações

Publicações por Hélio Mendonça

2005

Differential Gain and Phase Testing

Autores
Silva, JM; Mendonça, H;

Publicação
The International Series in Engineering and Computer Science - Dynamic Characterisation of Analogue-to-Digital Converters

Abstract

2005

Comparative Study of ADC Sinewave Test Methods

Autores
Silva, JM; Mendonça, H; Mazoleni, S;

Publicação
The International Series in Engineering and Computer Science - Dynamic Characterisation of Analogue-to-Digital Converters

Abstract

2005

ADC Applications, Architectures and Terminology

Autores
Silva, JM; Mendonça, H;

Publicação
The International Series in Engineering and Computer Science - Dynamic Characterisation of Analogue-to-Digital Converters

Abstract

2001

Differential gain and phase testing using joint time-frequency analysis

Autores
Mendonca, HS; Silva, JM; Matos, JS;

Publicação
IMTC/2001: PROCEEDINGS OF THE 18TH IEEE INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONFERENCE, VOLS 1-3: REDISCOVERING MEASUREMENT IN THE AGE OF INFORMATICS

Abstract
In this paper an alternative technique for differential gain and phase testing of video ADCs based on the use of joint time-frequency analysis is presented. This technique can lead to a significant improvement in ADC testing time and in the amount of information provided by these specific tests.

2012

Global localisation algorithm from a multiple hypotheses set

Autores
Pinto, M; Sobreira, H; Moreira, AP; Mendonca, H;

Publicação
Proceedings - 2012 Brazilian Robotics Symposium and Latin American Robotics Symposium, SBR-LARS 2012

Abstract
In this paper, a new fast and computationally light weight methodology is proposed to pinpoint a robot in a structured scenario. The localisation algorithm performs a tracking routine to pinpoint the robot's position as it moves in a known map. To perform such tracking routine, it is necessary to know the initial position of the vehicle. This paper briefly describes the tracking routine and presents a solution to pinpoint that initial position in an autonomous way. Experimental results on the performance of the proposed methodology are presented in this paper in two different scenarios: 1) in the Middle Size Soccer Robotic League (MSL), with artificial vision data from an omni directional robot, and 2) in an indoor environment with a Laser Range Finder data from a differential traction robot (called Robot Vigil). © 2012 IEEE.

1999

ADC testing using joint time-frequency analysis

Autores
Mendonca, HS; Silva, JM; Matos, JS;

Publicação
THIRD INTERNATIONAL CONFERENCE ON ADVANCED A/D AND D/A CONVERSION TECHNIQUES AND THEIR APPLICATIONS

Abstract
An account is given on the joint time-frequency analysis (JTFA) and the short time-frequency transform algorithm in particular as an alternative technique for dynamic testing of analog to digital converters (ADCs). It is shown that this technique can lead to a significant improvement in ADC testing mainly due the possibility of using non-stationary signals allowing a more rapid test capable of analyzing even localized features.

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