Abstract: A device for suppressing the interference echo signals in an optical pulse compression radar comprising, at the transmitting side, a circuit for generating electrical signals of determined duration and with a frequency variable as a function of time, called chirps, an optical transmitter comprising a continuous transmission source modulated by the chirps and, at the receiving side, a receiver for deriving chirps from the light signals received and a processing circuit for the chirps supplied by the receiver, comprising a first mixer receiving from said receiver the reception chirp and from said circuit the transmission chirp and then, when the latter is ended, a relay signal of a determined frequency, said first mixer delivering a signal of a frequency equal to the difference of the frequencies of the input signals, a filter for filtering out the interference component of the output signal from the first mixer, and a second mixer receiving, on the one hand, the signal thus filtered and, on the other hand, the

Abstract: A device for stabilizing the site of the sight line in an optical panoramic survey system carried by a vehicle, said system comprising a sighting tube rotatably mounted in the vehicle, driving means secured to the vehicle for rotating the tube about the optical axis thereof, and a reflector disposed at the top of the tube and rotatable about an axis normal to the optical axis, comprising a circular guideway, support means attached to the vehicle for supporting said guideway while holding vertical the axis thereof, a member guided along said guideway, a vertically adjustable member supported by said guided member, a link member with a variable length pivotally connected at one end to said adjustable member, a shaft secured to the other end of said link member, said shaft having an axis which intersects the axis of said guideway, means for imparting to said shaft a rotational movement identical with that of the tube, and means for transmitting the angular displacement from said shaft to said reflector with a 1:

Abstract: An automaton comprising a fixed frame, a horizontal guiding member carried by the frame, a carrier movable along said guiding element, and a gripping member carried by the carriage and movable in a vertical direction relative to the carriage. There is provided a single motor fixed on the frame, transmission means for achieving from the motor either the horizontal movement of the carriage or the vertical movement of the gripping member, an electronic control device for the motor and transmission means, and means for measuring the angular displacement of the motor shaft connected to the electronic device.

Abstract: An electromechanical filter having two transducers and a mechanical filter vibrating in longitudinal mode, which includes a plurality of resonators connected to each other by coupling rods. The resonators are arranged in two sections and staggered, and the coupling rods connecting two resonators are welded on flat portions provided at the ends of the resonators, each end resonator is connected to the respective transducer through a coupling rod secured to the end face of said resonator adjacent the flat portion, at a point located in the symmetry plane of the resonator, and the coupling rod which connects the end resonator to the next resonator is secured on the flat portion so that the middle of its welded length lies in said symmetry plane.

Abstract: A volatile cross-linking agent such as liquid peroxide is introduced, at ambient temperature and under atmospheric pressure directly into the input of an extruder at the same pressure as a polyolefin compound to be cross-linked. The resulting compounds are put under pressure within the extruder as the temperature increases so that the mixture reaches its definitive shape at the extruder output and may be fed directly into a hot cross-linking enclosure which is maintained under pressure. The peroxide is thus incorporated in a single operation permitting complete control of the ingredients mixed and allowing perfect homogenization of the mixture while defusion and consequent loss of the highly volatile peroxide are avoided. The system for introducing the highly volatile cross-linking agent includes a peroxide storage tank, a filling pump, a feed vessel, an incremental feed pump with a pressure meter, a flow meter and numerous safety features.

Abstract: A telecontrol order transmission system having at the transmitting end a source, for generating ergodic random signals x(t), a circuit for alternately delivering the sum and the difference of signals x(t) and x(t-T.sub.1), which circuit is switched at the rate of a frequency f.sub.c and, at the receiving end, a multiplier multiplies a received signal by said received signal delayed by time lapse T.sub.i, an integrator for time averaging the output of said multiplier, a band-pass filter with a narrow bandwidth centered about frequency f.sub.c, connected to the output of said integrator, and a circuit for deriving a telecontrol order from the output of said filter.

Abstract: A digital multiplexing and demultiplexing system for time division multiplexing a number of incoming plesiosynchronous low rate component signals and a number of incoming plesiosynchronous intermediate rate component signals into an outgoing single high rate signal. A first multiplexing stage time stores and stuffs the low rate component signals and multiplexes them into synchronous intermediate rate signals. A second multiplexing stage stores and stuffs the plesiosynchronous and synchronous intermediate rate signals and multiplexes them into the outgoing high rate signal.

Abstract: A magnetostrictive mechanical filter comprising at least one rod of a magnetostrictive material forming a resonance element, a spool surrounding the rod, a field coil the windings of which are wound around the spool, and magnets creating a continuous magnetic field, arranged respectively at the ends of the rod, the rod being held radially in at least three points disposed regularly about the rod in the vicinity of the middle portion thereof, a rib being provided at each fixation point, said rib extending parallel to the generatrices of the rod and being formed on the inner peripheral surface of the spool and integrally molded with said spool.

Abstract: The beam produced by a pulsed laser is directed onto a target and, once reflected, is heterodyned in a mixer with the light signal from a local oscillator. The resulting reception beat signal is applied to a chronometer to measure the distance from the target. A fraction of the transmitted beam is deviated to the mixer and heterodyned with the signal from the local oscillator to produce a transmission beat signal which is stored and then combined with the reception beat signal.

Abstract: The beam produced by a pulsed laser is directed onto a mobile and, once reflected, is heterodyned in a mixer with the light wave produced by a local laser operating in continuous mode.A part of the beam produced by the local laser is directed onto the target. The output of the mixer is applied to an opto-electronic circuit which derives a composite electric signal which is separated by appropriate filters into a first component representative of the distance from the mobile and a second component representative of the radial velocity of the mobile.

Abstract: A method of receiving a codirectional interface digital signal coded in bipolar form, each data bit being represented by means of four bits (1,1,0,0) for a binary "1" and (1,0,1,0) for a binary "0", a polarity alternation being effected every bit with a violation of polarity at each octet, comprising the steps of: separating the interface signal into its positive and negative components; producing a rectified signal from the said components; deriving from the rectified signal a bit timing signal; deriving the decoded data signal from the rectified signal and the timing signal; deriving from said components a signal representing the alternations of polarity; deriving from this latter signal and from the bit timing signal an octet timing signal; and comparing in phase the bit timing signal and the polarity alternation signal, a pulse for rephasing the bit timing signal being produced when the states of these two signals do not coincide at the time of a polarity alternation.

Abstract: A remote locating system for remote locating the pairs of regenerative repeaters of a bidirectional data transmission line which is interconnected between a monotoring station and a monitored station. The monitoring station comprises a first low frequency generator which generates a first low frequency signal on the forward line channel which is continuously transmitted in the forward direction from the monitoring station to the monotored station in response to the fault detection on the line and a second low frequency generator which generates a second low frequency signal on the backward line channel which is transmitted in the forward direction after the transmission beginning of the first signal. The second signal is modulated by successive pulses, each of which identifies a regenerative repeater pair.

Abstract: Guide for light or infrared wave beam in which a radial temperature gradient deflects towards the guide axis the light rays which tend to diverge therefrom. The isotherm pattern of two sets of four heater wires, each set being formed of pairs of wires diametrically opposite with respect to the guide axis, is calculated and it is shown that it comprises a particular isothermic curve which has the shape of a bean and separates the two sets of wires. The metal wall of the guide is given the shape of this particular isothermic curve and the set of heater wires outside this wall is omitted.

Abstract: A device for guiding by night self-propelled missiles, comprising a daylight sighting telescope and an infrared goniometer which in association are called here daylight localizing apparatus, for spotting an infrared source carried by the missile, and a thermal telescope for night vision, to which are associated an infrared detector and a display member, further comprising a thermal reticle, optical means for forming outside the daylight localizing apparatus the image of the daylight telescope reticle, means for shifting the daylight telescope reticle image so that it coincides with the thermal reticle, optical means for forming the thermal reticle image on the thermal telescope detector, and an adequate frame mechanically attached to the daylight localizing apparatus for supporting said means, said thermal reticle, the thermal telescope and its associated detector and display member.

Abstract: A pass-band electromechanical filter, comprising a mechanical unit vibrating in the longitudinal mode mounted between two electromechanical transducers, said unit comprising a plurality of half wave resonators mounted in series and coupling rods connecting the consecutive resonators, the resonators being distributed into two groups of which one comprises the resonators of odd rank and the other the resonators of even rank, the filter comprising moreover at least a bridging coupling rod connecting a resonator of rank k to a resonator of rank k+(2p+1) (p being a positive integer different from zero), said bridging coupling rod having its ends fixed at a certain distance from the end faces of the resonators, at least the bridging coupling rod on the one hand, or the coupling rod placed between the resonator of rank k and that of rank k+(2p+1) on the other hand, having a length which is respectively different from a three quarter wave or different from a quarter wave.

Abstract: A digital switching unit is used in a multirate time-division multiplex digital switching network, in which first-order digital data channels transmitting words consisting of a given number of bits and having first rates which are different from, but multiple of, one another are given a first multiplexing converting them into the second-order digital data channels having a second predetermined rate. The switching unit comprises at least one buffer store in which the first-order channel words multiplexed into third-order channels are grouped at an address having first and second part, whose first part is the address of the second-order channel containing the first-order channel word in the third-order channel and whose second part is the address of the first-order channel in the second-order channel.

Abstract: A method for masking on the display device associated with a thermal telescope for the night guidance of self-propelled missiles carrying an infrared source, the image of a source of relatively intense stray radiations, wherein, on the one hand, the radiations transmitted in the field of vision of the thermal telescope are simultaneously detected in two different spectral bands, of which the one, called the useful band, corresponds to the maximum radiations from the target and the surrounding landscape, and the other one, called stray band, corresponds to the maximum radiations from the intense infrared sources carried or not by the missile, and on the other hand the signal detected in the first band is corrected by the signal detected in the second band in a manner to leave out the stray portions of the useful signal.

Abstract: A night guiding device for self-propelled missiles, comprising a daylight sighting telescope and an infrared goniometer, the unit being called a localizing apparatus, for detecting an infrared missile-borne source, or tracer, a night sighting thermal telescope, a visualization device associated therewith, further comprising a computer arranged for receiving through storing, amplifying and processing means, on the one hand signals transmitted by the localizing apparatus and characteristic of the missile position in relation to the optical axis of said localizing apparatus, and on the other hand signals supplied by the thermal telescope and characteristic of the missile position in relation to the optical axis of said thermal telescope, said computer supplying to said visualization device, signal representative of the difference between the signals received respectively from the localizing apparatus and the thermal telescope.

Abstract: A system for transmitting alignment data from the turret of an aircraft carrier to aircrafts stationed on the flight deck, comprising optical transmitters with modulable beams placed on the turret, means for modulating the transmitter beam from the data, an optical detector placed on each aircraft and means for demodulating the output signal of the detector, wherein each transmitter comprises a plurality of infrared electroluminescent diodes and means for changing the beam from the diodes into a beam which is substantially horizontal with an angle of site of a few degrees, the transmitters being arranged in such a manner that the adjacent transmitter beams overlap to a large extent and the optical detector is omnidirectional in the horizontal plane.

Abstract: A semiconductor device comprises a substrate made of an alloy having the formula Cd.sub.x Hg.sub.1-x Te where x is a non-zero number less than 1. The substrate has P type conductivity and a doping agent such as mercury is diffused into the substrate to form a region of N type conductivity therein. Before diffusion of the mercury into the substrate, a protective layer of cadmium telluride CdTe is applied to the surface of the substrate and the doping agent is diffused into the substrate through the protective layer. The device finds application as a photovoltaic detector of infrared radiation.