Abstract: A working memory contains a local altimetric map defining an altitude envelope of the terrain in the vicinity of the aircraft. A vertical limit path of the aircraft is established, on the basis of status indications and selected flight parameters, in the vertical surface containing the axis of its path. A first comparison is undertaken between this vertical limit path and the corresponding part of the altitude envelope, so as to determine a hazard of a vertical collision with the ground, and an alarm can be established according to the result of this first comparison. A lateral limit path of the aircraft on one side of the vertical of the flight path is also established on the basis of the status indications and selected parameters. A second comparison is made between this lateral limit path and the corresponding part of the altitude envelope.

Abstract: The pointing of at least two sensors (61, 62) is ensured through a Luneberg lens (50). A first frame (20) pivoting on a support (10), supports in pivoting manner a second frame (30), which can in turn support the lens (50). The second frame (30, 40) supports at least one rail (41) for guiding the sensors in the vicinity of the focal surface of the lens. Control means (90) act on the mount as a function of data concerning the position of satellites to be sighted. They are arranged so as to temporarily stop the sighting of one of the satellites, bring the mount into an opposite position on the focal surface, whilst continually sighting the other satellite, and resume the sighting of both satellites, the two sensors then being in an inverted position on the rail.

Abstract: A multilayer structure (S,1-3) is surmounted by parallel primary lines (4-1, 4-2) which define, in the regions situated below them, waveguides operating according to a first propagation mode. At least one electro-optical control means (E-1) is placed at a selected location between each pair of primary lines and, under certain conditions, enables the local existence of a second propagation mode affecting the two regions together, so that the transfer of the first mode between the two guides which enclose it can be controlled by acting on the second mode. This makes it possible to produce an energy distributor based on a so-called “cascade” architecture.

Abstract: A receiver of modulated carrier-wave signals equipped with a pseudo-random code time marker, particularly for radio navigation, comprises coincidence modules each of which comprises chronometric memory media which receives a wanted signal, provides storage as data of the time offset of the code offset estimates and the frequency and phase carrier-wave status, and on that basis provides, with a local clock, a local carrier-wave image and that least one local code repeat for the relevant signal and code and carrier-wave slaving control functions providing correlation of the wanted signal and the local code repeat on the basis of a frequency and phase offset signal between the carrier-wave of the wanted signal and the carrier-wave image.

Abstract: An n-tuple defines an envelope of a variable over a time interval. An input memory receives blocks of measurements made at known points of the network and converts them into initial n-tuples. In a base memory, a functional model comprises a list of components, (Lv), and the designation (Df, Dg) of at least one particular function of the measurements (Lp). Management will, repetitively, (a) match together available initial n-tuples, and at least one model applicable to them, (b) through computations on n-tuples, with the function designation (Df, Dg) of the model, and these n-tuples, obtain at least one result n-tuple (Nf, Ng), (c) apply the result n-tuple (Nf, Ng) to test for a standard expression, and (d) associate the output from the test with the list of components (Lv) of the model. Decision logic analyzes various outputs from the test, with a view to determining one or more defective components.

Abstract: The antenna device comprises, on a substrate, a plurality of radiating elements and a pair of terminals for the supply of high-frequency electrical signals for each one of these elements. Each one of these radiating elements comprises a zone of spiral configuration (SPi), and possesses an extension (PB1i, PB2i) of the strands of its spiral having geometric characteristics different from those of said spiral, to form, for example, a peripheral ring (CP) surrounding the latter.

Abstract: A frequency translator includes two multipliers which receive one and the same high-frequency signal on first inputs in quadrature with respect to one another, and one and the same low-frequency signal on second inputs also in quadrature with respect to one another. Each multiplier comprises a pair of elements whose capacitance can be varied in a controlled manner, jointly and in opposite senses, connected in parallel. The respective outputs of the two elements of each pair are combined additively, considering their phase opposition, in order to form the outputs of the two multipliers which supply a summer.

Abstract: A device for aiding aerial navigation, carried on board an aircraft, receives on an input, status indications representing its spatial position and its velocity vector, and stores a 3D representation of the relief overflown. It comprises processing define, as a function of the status indications, an exploration sector referred to the aircraft, and calculate in this sector a contour as a function of the intersection of this sector with the relief, with a view to the displaying thereof. The sector is defined by a sheet of trajectory lines obtained on the basis of the velocity vector and of auxiliary vectors calculated by shifting the velocity vector of the aircraft according to a chosen angular scanning law.

Abstract: An improved microstrip antenna device, in particular for telephone transmissions by satellite. An antenna comprises a first dielectric layer including on one side a ground plane and on the other a first conductive patch of a chosen shape, a second dielectric lalyer surmounts the first dielectrica layer on the side adjacent to the first patch and supports, on the other side remote from the first patch, a second cnoductive patch of a chosen shape. A third dielectric layer surmounts the second. The second patch is of a size smaller than that of the first patch and this first patch is fed from below at at least one chosen point situated between its center and its circumference. Advantageously, the first patch is connected to a lead-in of the ground plane joining a feeding circuit implanted in a dielectric substrate of a three-plate structure.

Abstract: A mechanical filter includes a pouch with a double-walled envelope housing a shock-absorbing material in the form of a gel displaceable under pressure. The envelope, of selected geometry, is mainly formed of a thin film of synthetic thermoplastic material, whose physical properties are selected to prevent breakage during displacement of the gel.

Abstract: A control device for making safe a fast vehicle comprises a servomechanism that, in response to a reference variable relating to the longitudinal speed of the vehicle, adapts in real time an actuator variable of a motor element of the vehicle until an actuator variable of a steering element corresponds to a reference variable relating to the transverse displacement of the vehicle, which makes it possible to make safe the longitudinal and transverse displacements of the vehicle, even at high longitudinal speed.

Abstract: An electromagnetic lens comprises two conductive sides between which there is arranged a cavity provided in its lateral portion with electromagnetic input/output coupling transitions to authorize a set of propagation laws between pairs of such inputs/outputs. Moreover, it comprises, substantially centered in the cavity, a substrate comprising a printed conductive patch of predetermined dimensions, so that the two conductive sides and the patch thus create a suspended three-plate strip line structure. The content of the cavity and the respective geometries of the cavity and of the conductive patch are chosen to comply with the propagation laws.

Abstract: A two-directional network antenna includes N parallel and juxtaposed arrays of antenna elements respectively connected to electronic transmission/receiving circuits by an ultrahigh frequency connecting device with phase shifts controlled by a control device. The ultrahigh frequency connecting device comprises N transmission lines respectively associated with N arrays of antenna elements, each transmission line having outputs in propagation lengths which are staggered in relation to their input, which outputs are connected to respective antenna elements of the associated array. The ultrahigh frequency connecting device further comprises at least one electromagnetic lens with P inputs and N outputs respectively connected to N inputs of the transmission lines.

Abstract: An interferometric receiver for electromagnetic signals comprises at least two reception channels. Each channel consists of an antenna (A1), followed by a single sideband mixer (M12) and a mixer (M14).As a local signal, the mixer (M14) receives a signal similar to the received signals, taken, for example, from an auxiliary antenna (AR) followed by a limiting amplifier (ALR). The first mixer (M12) receives a frequency from a generator (GFI), which frequency is equal to the value of the intermediate frequency used in the stages (FI1) of this type following the mixer (M14). A phase processing can then be carried out and different countermeasures taken, the simplest of which is a visualization (VI).

Abstract: The invention relates to a distributed amplifier for wide band hyperfrequency signals of the type comprising:a plurality of basic amplifying cells (C.sub.1 to C.sub.n) mounted in series, with at least one common drain line (Ld) and at least one common grid line (Lg), each cell comprising at least one field effect transistor (T.sub.1) which is common-source mounted and filtering elements,first biasing means for applying a first biasing voltage (Vd) to the common drain line, andsecond biasing means for applying a second biasing voltage to the common grid line. According to the main feature of the invention, the first biasing means comprise a plurality of auxiliary field effect transistors (T'.sub.1 to T'.sub.n) functioning in saturable load mode and whose respective sources (S'.sub.1 to S'.sub.n) are distributively connected up to the common drain line (Ld) and whose respective drains (D'.sub.1 to D'.sub.n) receive in series the first biasing voltage (Vd).

Abstract: A receiver device is intended to detect a beam of electromagnetic entry signals of a known geometry, arriving at a variable entry angle of incidence. It comprises an optical lens, comprising at least one aspherical surface capable of correcting the geometry of an incident beam according to a correction formula chosen in accordance with the entry angle of incidence, for transforming it into an incident beam and applying it to a quadratic detector. This tends to suppress the divergences of the energy received by the detector cording to the angle of incidence, and makes it possible to render substantially constant the signal-to-noise ratio of the detection and the detected signal, irrespective of the entry angle of incidence of the incident entry beam.

Abstract: The data-recording device comprises: a temporary safety electronic-technology medium (MEM), on which the data (D) coming from the interface (IT) are recorded temporarily, in succession, as they are received. Particular means (AC, TH) acquire at least one selected quantity relating to a predetermined environmental or operating condition of the recording device or of at least one its constituent components and supply a datum (A0, T0) representative of the said quantity acquired.

Abstract: The device for the detection and location of objects on the ground in a delimited zone comprises (i) a radar transmitter/receiver provided with at least one antenna generating a radiating beam displaced parallel to itself over a path that is substantially transverse with respect to its direction round a stationary position relative to the ground, and (ii) synthetic aperture radar processing means processing the output signal of the radar receiver relating to the return of said beam over said zone in accordance with the antenna movement, so as to detect and locate the objects on the ground in the said delimited zone.

Abstract: A mass memory stores a data base representing at least a substantial part of the terrestrial globe, in accordance with a grid configuration on several levels, said grid configuration being in particular more precise in the vicinity of an airport. Status indications are received representing the position of the aircraft with two horizontal components, and the altitude, and the velocity and acceleration vectors of the aircraft, as well as control indications coming from the flight deck. In accordance with the horizontal components of the position of the aircraft, a temporary local map is transferred into a fast access memory, on the basis of which map, an altitude envelope of the terrain is established in the zone where the aircraft is travelling. Anticollision processing make it possible to establish an alarm if the relation between a protection field and the altitude envelope meets a first condition which is defined at least partly by the control indications.

Abstract: An insulating electrical feed-through connector extending through a wall of aluminium is obtained by using a sintered sleeve comprising phosphate glass in which a conductive pin is inserted. The sleeve is raised to a firing temperature in excess of the dilatometric softening temperature of the vitreous material in the presence of a first effective quantity of alumina between the sleeve and the wall and of a second effective quantity of nickel oxide between the sleeve and the pin, which makes it possible to achieve a simultaneous and direct hermetic sealing of the sleeve to the wall and of the pin to the sleeve.