Abstract: The surveillance radar device comprises, in combination, a fixed antenna for providing electronic scanning of space in bearing in the horizontal plane, a transmit source and microwave frequency transmit/receive means with a circulator, a transmit channel, a receive channel and means for subdividing the receive channel into a sum signal and at least one difference signal. A first and a second receiver element with frequency change respectively receive the sum and difference signals, and provide numerically coded outputs. Processing means process numerical signals from the first and second receiver elements for the radar detection of objects in the zone under surveillance.

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: A microstrip antenna device having a dielectric layer, a conductive patch of a chosen shape on one side of the layer and, on the other side of the layer, a conductive plate forming a ground plane; and, a feed circuit comprising at least one microstrip line connected to the conductive patch and implanted in the dielectric layer in the same plane as the conductive patch. The thickness of the dielectric layer opposite the microstrip line is greater than the thickness opposite the periphery of the microstrip line. Further, the thickness of the dielectric layer opposite the conductive patch is greater than the thickness opposite the microstrip line, and also greater than the thickness opposite the periphery of the conductive patch.

Abstract: The first receiver element includes a detector element subdivided into first and second detector subelements each having a photosensitive section of a general elongate rectangular shape and disposed longitudinally opposite the radiation emitted by the first emitter element, the first and second detector subelements being disposed next to each other on their longer sides, with their substep chosen to be equal to, at most, strictly half the step of the first emitter element. An electronic receiving channel is assigned to the first or second detector subelement. Main switching means electrically connect the first or the second detector subelement to the electronic receiving channel according to a predetermined reception condition relating to the signals received by the said first and second detector subelements.

Abstract: A frequency synthesizer device which comprises a combination of: an oscillator, a phase comparator, a frequency generator having an input receiving the reference frequency of value OF and N outputs, with N being a whole number between 1 and N, each output being designed to deliver a frequency having a value equal to 2.sup.N FO, a phase-locked loop consisting of N links connected in series between the output of the oscillator and the first input of the comparator, each link comprising a mixer having a first input connected to one of the outputs of the frequency generator, a second input and an output, the second input of the current mixer being connected to the output of the preceding mixer and the second input of the mixer being connected to the output of the oscillator.

Abstract: A jettisonable means comprises means with a travelling-wave tube for emitting electromagnetic waves. It forms part of an assembly having external power supply means for supplying the filament of the travelling-wave tube. The external power supply means temporarily supplies the filament of the travelling-wave tube to heat it to its nominal temperature before jettisoning, whilst, at the moment of jettisoning, the external power supply means are disconnected. This enables a temperature appropriate to the operation of the travelling-wave tube to be provided temporarily, after the jettisoning.

Abstract: A tunable microwave bandstop filter device comprises a main microwave transmission line (1), at least one filter cell comprising a coupled line segment (4) coupled to the main transmission line (1) and arranged parallel to and remotely from the latter, and also a tunable LC resonant circuit (5, 6). According to the invention, the tunable LC resonant circuit (5, 6) is placed between one of the ends of the line segment (4) and the main microwave transmission line (1).

Abstract: A relay satellite receives, from stations on the ground, modulated high-frequency signals situated in two different frequency bands. One of the modulations is narrow band and the other broad band. The satellite retransmits a multiplexed signal resulting from the phase modulation, of a sub-carrier consisting of the signal modulated by the narrow band modulation. The phase modulation is performed using signals drawn from the signals that carry the broad-band modulation. The user stations receive this multiplexed signal and extract therefrom, by filtering, the narrow band modulated sub-carrier, which can be used for phase-demodulating the multiplexed signal in order to recover signals which carry the broad-band modulation.

Abstract: A specific module of a communications network comprises (i) first and second telephone interface mechanisms respectively connected to telephone channels, (ii) interconnection mechanisms between these first and second interfaces, and (iii) a processing mechanism. In response to a request for a telephone call from a telephone set calling a call (dialing) number assigned to a portable handset, the call request being received at one of the first interfaces, an attempt is made to establish, in addition to the first telephone connection from the calling set to said first telephone interface, a second telephone connection from the portable handset to one of the second telephone interfaces in accordance with predetermined conditions, and the interconnection of the first and second interfaces concerned is obtained.

Abstract: An insulating electrical feed-through connector extending through a wall of aluminum 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.

Abstract: An electronic device includes an antenna enclosure provided with a circuit on which an antenna is etched and a balun circuit for feeding the antenna, itself connected to a microelectronic enclosure fitted with an airtight connection having a sealed glass bead with at least one conducting wire passing through it. The balun circuit has at least two different tracks on each side of a dielectric substrate. At least one immediate electrical contact is provided between the conducting wire of the enclosure and one of the tracks of the balun circuit, at the same time as a direct mechanical fixing of the antenna enclosure to the microelectronic enclosure, accompanied by another connection of the same type or an earth transfer conductor which is connected to the other balun track and is in contact with the microelectronic enclosure.

Abstract: In a method of transmitting an electromagnetic signal in an optical fiber a polarized optical base signal is generated and input at a first and of an optical fiber, an optical signal emerging from the fiber after the base signal has passed through it is recovered at a second end of the fiber; this emergent signal is processed by electro-optical modulation with the electromagnetic signal which is to be transmitted and polarization conversion is effected, and the optical signal modified in this way is reinput to the said second end of the fiber; an optical return signal emerging from the fiber after the modified optical signal has passed through it is recovered at the first end of the optical fiber and this is analyzed in order to determine the characteristics of the electromagnetic signal.

Abstract: The invention concerns a feedback control loop comprising a mixer comprising a first input receiving an electromagnetic signal, and a second input receiving a first local signal; an intermediate frequency line mounted between the output of the mixer and the input of a phase comparator which receives on a second input a second local signal and has an output; and a feedback line connected between this output and the second input of the input mixer, and comprising a loop filter controlling a variable oscillator for providing the said first local signal as well as a second variable oscillator for providing the second local signal.

Abstract: Device for testing a network of components, in particular an electronic circuit.The respective potential differences between the terminals of the circuit to be tested are acquired during a chosen time interval and stored in a values memory. A memory contains predetermined functional models of electronic components. The processing means, connected to these memories, are capable of effecting a processing comprising the estimation, during said time interval, of physical values, notably of current-expressions, taking account of expressions contained in said acquired models and values, and storing them in the values memory as well as tests on the values contained in the values memory.

Abstract: A central roller (70) is driven into constant motion by a toothed belt (85) and by drive rollers (88, 89.) A moving element comprising a bracket (92) bearing an idle roller (90) that is elastically biased toward the central roller is mounted on the shaft (7) of the central roller, and this assembly is separately driven by the rollers (78, 79), by a toothed belt (75) and a drive system (MC, 77). An entering bill is inserted between the rollers (70) and (90). The shaft of the roller (90) remains stationary until the bill has moved passed it in a predetermined manner. Thereafter, the moving element (92) driven into rotation at a controlled angular speed exceeding that of the roller(70), whereby the bill shall be constantly held between the central roller (70) and the idle roller (90) while this same idle roller (90) however moves toward the end of the bill until releasing it into a bin.