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.

Comparison between SRAM SEE cross-sections from ion beam testing with those obtained using a new picosecond pulsed laser facility

Abstract: A new pulsed laser facility has been developed to extend laser testing techniques to generate upset cross-section curves. The objective has been to establish an economical laser-based bulk screening capability for SEE susceptibility.

Position adjusting device for motor vehicle seats

Abstract: The device comprises at least two parallel rails (12) fixed to the floor of the vehicle and two slides (14) integral with the seat, which can slide on the rails (12) and are equipped with means, which can be deactivated with the aid of a manual control borne by the frame of the seat, for locking the slides in any one of several longitudinal positions. The locking means comprise housings distributed along the rails, these being intended to receive a lock bolt borne by the slides (14) and pushed back towards a position of engagement in one of the housings. The manual control includes a member which can be displaced along the slide from a position of rest in which it leaves the lock bolt free to engage in one of the housings towards a position in which it moves the lock bolt away from the housings.

Accuracy and stability of the null space method for solving the equality constrained least squares problem

Abstract: The null space method is a standard method for solving the linear least squares problem subject to equality constraints (the LSE problem). We show that three variants of the method, including one used in LAPACK that is based on the generalized QR factorization, are numerically stable. We derive two perturbation bounds for the LSE problem: one of standard form that is not attainable, and a bound that yields the condition number of the LSE problem to within a small constant factor. By combining the backward error analysis and perturbation bounds we derive an approximate forward error bound suitable for practical computation. Numerical experiments are given to illustrate the sharpness of this bound.

Phase advance angle optimization for brushless motor control

Abstract: A control system for a multiphase permanent magnet motor having a controller for producing a control signal to energize each phase winding. The controller includes a current value calculator for determining a value of phase current advanced in phase with respect to back-EMF by a phase advance angle, and a phase advance optimization circuit for producing a value of the phase advance angle optimized so as to maximize output torque of the motor and mimimize the phase current. The phase advance optimization circuit determines the phase advance angle optimized for each phase of the motor.