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.

Transformation champ proche — champ lointain bidimensionnelle et monodimensionnelle appliquée à des mesures de SER

Abstract: Les mesures deser de cibles de dimensions importantes en hautes frequences doivent etre effectuees a des distances telles, que la distance de champ lointain (distance de Fraunhofer) R soit verifiee R ≥ 2d2/λ, ou d est la longueur transverse de la cible et λ la longueur ďonde electromagnetique. Dans cet article sont proposees deux methodes: ľune de correction de sphericite, ľautre de correction de cylindricite de ľonde electromagnetique. Les deux approches ont ete developpees, validees, puis industrialisees. Le principe de ces deux corrections est base sur ľapplication du principe de Huygens au cas du radar monostatique. Un developpement theorique de la correction de sphericite (correction bidimensionnelle) et de cylindricite (correction monodimensionnelle) est presente ainsi que des simulations puis des validations sur cibles reelles. Enfin une comparaison des deux methodes est proposee et montre ľefficacite de la correction bidimensionnelle.

Missile launcher with an ejecting skid

Abstract: Le lance-missile est destine a etre monte sur un aeronef militaire. The missile launcher is designed to be mounted on a military aircraft. Il comporte des moyens permettant d'ecarter le missile de l'aeronef avant allumage du propulseur de ce demier et des moyens desarmables d'accrochage du missile, sur une structure support. It comprises means to separate the missile from the aircraft before ignition of the propellant of the latter and desarmables hooking means of the missile, to a support structure. Les moyens d'ecartement comprennent un patin (60) d'appuie sur le missile, relie a la structure support par des biellettes (62, 70) articulees de facon a constituer un parallelogramme deformable, et des moyens a pression de fluide pour, successivement, desarmer les moyens d'accrochage et commander les biellettes dans un sens provoquant la poussee du missile par le patin. The spacer means comprises a shoe (60) supported on the missile and connected to the support structure by connecting rods (62, 70) hinged so as to constitute a deformable parallelogram, and fluid pressure means for successively disarm the hooking means and the control rods in one direction causing the thrust of the missile by the pad.

Satellite navigation by stellar refraction

Abstract: An autonomous attitude and navigation system is described in this paper. It performs the satellite attitude estimation and the navigation with the same star sensors. The use of only natural resources to update the navigation filter provides a total autonomy to this system. The stellar refraction measurement principle is described and the model used in the study is compared with the results of an experiment on stratospheric balloon. The complete computer simulation and the hardware design are also detailed and benefits to potential users are investigated.

A software-reliability assessment model

Abstract: The author presents an original approach to software prediction based on previous studies conducted under Rome Laboratories' (formerly RADC) contracts. In the model presented, tradeoff analysis is performed on the software architecture, taking into account the future operational use of the software studied. The organization and the amount of effort spent on the development are also discussed. The results of this model can be compared with growth-model results in future development steps. This model has been applied to industrial developments, and thus one is in a position to discuss the advantages and limitations of its present version. One example of this is presented. >