Matra

About: Matra is a based out in . It is known for research contribution in the topics: Signal & Detector. The organization has 1330 authors who have published 1216 publications receiving 17967 citations.

Evaluation of autonomous gnc strategies for the rosetta interplanetary mission1

Abstract: This paper presents the most recent results obtained in the frame of the ESA study on “Autonomous and Advanced Navigation Techniques”, part of the Technology and Research Programme of ESA. New guidance, navigation and control (GNC) concepts applicable to the near-comet phases of the ROSETTA mission have been investigated and detailed performance results obtained with a complete simulation software tool are described here. This paper is focused on the evaluation and performance assessment of GNC concepts applicable to the descent and landing phase of the mission, including the following points : - Attitude and Articulation Control System (AACS) concepts for a multibody spacecraft (Section 3); - autonomous spacecraft trajectory Guidance, Navigation and Control concepts for the descent phase, including the open-loop and the guided subphases (Section 4); - touch down control concepts (Section 5) The introduction presents the study assumptions, Section 2 is dedicated to the description of the software tool and the simulated models, and a synthesis with further recommendations are discussed in Section 6.

Numeral amount recognition on multi-bank cheques

Abstract: We present in this paper an automatic recognition module for the handwritten numerical amounts on multi-bank French cheques. This module is integrated in LIRECheques system, a system developed by MATRA CAP Systemes, which uses it in collaboration with the automatic recognition of the literal amounts. Two particular aspects of the numerical amount recognition system are detailed: the numeral recognition stage itself and the syntactic analysis. The numeral recognition module filters, by means of a structural supervisor, the digit results derived from the parallel combination of, on one hand a concavity based recognition and on the other hand a structural/statistical feature based recognition. The syntactic analysis module combines a pure syntactic analysis with contextual information (so called syntactic/contextual analysis) to take into account the segmentation behaviour and the presence of literal entities.

Topographic Description Of Grey-Tone Images: Some Applications To Segmentation And Tracking.

Abstract: A grey-tone image can be viewed as a three-dimensional continuous surface with peaks, ridges, valleys, plains and oriented facets. In this paper, simple methods are described to analyze the structure of this three-dimensional surface. A small number of classes are defined to represent the structure of the image, and an algorithm is used to classify each pixel according to its local grey-tone structure. Then, region growing procedures are given to segment the image into semantically meaningful regions. The problem of establishing a relationship between a topographic class and the physical properties of the image is also addressed and an algorithm is proposed to extract image patches which correspond to three-dimensional continuous surfaces in the scene. Applications of these algorithms to several images are presented and discussed.

The detector signal processing chain of the iso long wavelength spectrometer

Abstract: This paper describes the analogue signal processing chain for the detectors in the Long Wavelength Spectrometer (LWS) to be flown on board the Infrared Space Observatory (ISO) satellite. The satellite, its mission, and the on-board experiments are briefly reviewed, and the configuration of the LWS Detector Subsystem is described. Two possible signal readout and amplification schemes, based on the Transimpedance Amplifier (TIA) and the Integrating Amplifier (IA) are discussed. The reasons for the choice of the IA for the LWS are outlined. The design of the complete LWS detector signal chain is presented.

Amplifier with dual band output.

Abstract: of EP0465314The amplifier according to the invention comprises a transistor (1) associated with an input impedance matching circuit (2), a biasing circuit (8), an output matching circuit (16), a branch circuit (21) matched to generate a frequency doubling of an input signal and a unit (24) for switching between an open or closed state arranged between the branch circuit and earth