Abstract: A device for the optical processing of electrical signals. An optical source (L) emits a multiple-wavelength optical beam (B1). A modulator (MOD) modulates this beam. An optical fiber (F) receives the modulated beam and delays the components corresponding to the different wavelengths differently. A dispersive grating disperses wavelengths contained in the modulated beam in different directions. A spatial light modulator controls the level of optical intensity of different directions of the dispersed beam. An optical detection system receives the beam processed by the spatial light modulator. Such a device may find particular application to a transverse filter and microwave signal correlator.

Abstract: The present invention relates to a process and a system for determining the position and orientation of a mobile, and to applications thereof.In order to ascertain both the position and orientation of a mobile, the invention proposes an interrogation/response process whose particular feature is to supply, to a given interrogation, two responses which are distinguished on the one hand, by different modulating frequencies and, on the other hand, by the fact that they are transmitted according to two patterns which differ in aim relative to one another. It is then possible, simply by measuring the angular deviation of either one of the two responses, and simply by measuring the ratio of the amplitudes of the two responses received, to deduce on the one hand the angular position .phi. and on the other hand the orientation .theta. of the mobile.The applications in the automobile sector are numerous (anticollision, control of road traffic and of compliance with the highway code, automatic toll points, etc.).

Abstract: A monitor receiver incorporating a device for reducing the false alarm ratio comprises a frequency changer, a wobbulated oscillator, two band pass filters of which the central frequencies are constant and staggered, two logarithmic amplifiers and two energy detectors, which makes it possible to measure the energy on two staggered frequencies. The logic alarm signal supplied by the comparator is transmitted via a gate inhibited by means for detecting pulsed noises having an energy level greater than a value S', and validated by means of detecting signals of higher energy than a value S". The threshold values S' and S" are calculated by calculator means as a function of the mean value of the energy of the medium and long term persistent noise on frequencies close to the frequency monitored.

Abstract: The invention relates to high-speed correlating arrangements. Input memories receive the signals to be correlated in the form of successions of samples. At read-out of samples in the memories, the time scale of one of the signals is reversed and the two series of samples are used to modulate a wave supplied by an oscillator. The two modulated carriers are applied to an electroacoustic convolver from which, after detection and filtering, the correlation function of the input signals is obtained.