| Patent Number |
Title Of Patent |
Date Issued |
| 5307074 |
Collision avoidance system for sea navigation |
April 26, 1994 |
| A collision avoidance system for sea navigation comprises, for each equipped ship, a transmitter that repeatedly transmits the geographic coordinates, course and speed of its own ship and a receiver that sends a display device similar data received from other ships. These received data |
| 5001488 |
Battlefield IFF method and system for its application |
March 19, 1991 |
| An IFF system interrogating station comprises an IFF interrogator which has its transmission antenna joined to the infra-red camera of a field observation device. Each friendly vehicle is fitted with an IFF receiver antenna and an infra-red laser transmitter transmitting a laser pulse at |
| 4999835 |
Method and device for asynchronous mode transmission putting microcells into use |
March 12, 1991 |
| In asynchronous mode transmission for multiple-service networks with a wide range of throughput rates, it is stipulated that the digital data will be conveyed in standard cells having a header and a data field, with fixed lengths. For the low throughput rate services, which are penalized |
| 4956841 |
Method and device for switching a packet of data |
September 11, 1990 |
| The invention relates to the sending, by a sender, of messages, by means of arrowed packages, in a communications network comprising switch nodes. The packet is prepared by the sender so as to travel over a path that successively takes it to all the nodes where there are subscribers for |
| 4933952 |
Asynchronous digital correlator and demodulators including a correlator of this type |
June 12, 1990 |
| A demodulator to demodulate a complex signal formed by two carriers, in quadrature, the spectrum of which is spread by a pseudo-random signal, and which are modulated by an M-ary, Walsh, code comprises:a chain of registers to store 256 bits of a pseudo-random signal;a multiplexer to temporal |
| 4926183 |
Radar, notably for the correction of artillery fire |
May 15, 1990 |
| A radar, notably for the correction of artillery fire, comprises means for an antenna scan, in bearing, in a limited zone .DELTA.G around a central position coinciding with the objective in that, and means to compare the received signals with a set of reference signals representing the |
| 4894655 |
Landing assistance system using navigation satellites |
January 16, 1990 |
| The system according to the invention uses GPS/NAVSTAR navigation satellites and includes:a fixed station located in the vicinity of the landing zone, containing a receiver for positioning by satellite that gives an estimate of the position of this fixed station and computing means that |
| 4864307 |
Method and device for the automatic recognition of targets from "Doppler" e c |
September 5, 1989 |
| A method and device are provided for the automatic recognition of targets from "Doppler" echoes. The method consists in comparing sequentially the spectra of the "Doppler" signal retransmitted by each target with successions of spectra corresponding to known targets stored in a dicti |
| 4785464 |
Method and device for regenerating the integrity of the bit rate in a plesiosynchronous system |
November 15, 1988 |
| The network of the invention comprises, in the transmitter, a "marker" generator which inserts bits of a cyclical sequence into the binary data flow and, in the receiver, a marker processing circuit by which it is possible to identify the start of the marker cycle in order to re-justify |
| 4779096 |
Process and device for limiting traffic to be used with an interrogation/response system such as |
October 18, 1988 |
| The process for limiting traffic according to the invention comprises an AND input gate receiving the incident pulses representative of the interrogations of the system, its output being connected to an authorization output as well as to a counter which is itself connected to an adde |
| 4743863 |
Device to increase the dynamic ratio of an amplifier circuit, especially that of an on-board MLS |
May 10, 1988 |
| To increase the dynamic ratio of an amplifier, it is preceded by a switchable attenuator which is switched on when the output voltage of the amplifier exceeds a threshold, this output voltage being added to a shifting voltage. |
| 4709237 |
Device for eliminating low frequency noise from a transmission system, in particular 1/f noise i |
November 24, 1987 |
| Device for eliminating the noise in 1/f from a Doppler radar comprising in the HF emitting system, a phase coder introducing, at frequency PRF/2 a phase shift of 0 and .pi. alternately, and in the receiving system, after the receiver, a decoder, or gain inverter progrmmable between -1 an |
| 4648101 |
MLS on-board receiver circuit to decode fast-scanning boosted preamble |
March 3, 1987 |
| The decoding circuit of the invention comprises essentially a digital filter 16, a pulse-width recognition circuit 17 a pulse peak amplitude selection circuit 23 and a circuit for decoding MLS boosted scanning pulse pairs 32 to 38. This decoding circuit makes it possible to eliminate |
| 4647930 |
Passive radar responder |
March 3, 1987 |
| The invention concerns beacons associated to radars.It consists in modulating the re-emitted signal, in phase by the frequency of a vocal signal, and in amplitude by the envelope of this signal.It allows vocal transmission between such a signal and a Doppler radar. |
| 4553144 |
Ground surveillance Doppler radar |
November 12, 1985 |
| The invention relates to Doppler radar making it possible to subject the ground to surveillance.It consists of providing a conventional Doppler radar having a transmitter, a receiver, processing means making it possible to supply a binary signal indicating the presence or absence of a mo |
| 4546356 |
Process for the protection of a radar against jamming and radar for putting this process into ef |
October 8, 1985 |
| A process for protecting radars against jamming, in which a pseudo signal is transmitted simultaneously with the useful signal and is formed from pulses synchronous with those of the useful signal. The amplitude of the pseudo signal is higher than that of the useful signal in order that |
| 4538148 |
Coherent radar |
August 27, 1985 |
| A coherent radar including separate transmitting and receiving chains. The transmitting chain includes a master oscillator providing a signal at frequency F0. A multiplier multiplies F0 by a predetermined amount to produce a signal at a frequency F1. A second multiplier multiplies the |
| 4500848 |
Field effect transistor microwave amplifier |
February 19, 1985 |
| In a microwave preamplifier of a Doppler radar system used for Earth observation, three pre-matched and self-biassed field effect microwave transistors are provided. By supplying these transistors by means of a voltage regulator, whose output voltage varies under the action of a cont |
| 4482867 |
Microwave power transmitter for doppler radar |
November 13, 1984 |
| In a microwave power transmitter for Doppler radars for terrestrial surveillance, use is made of four stages in series comprising first and second preamplifiers, and first and second power amplifiers. These stages are supplied by a group of separate voltage regulators. These regulators |
| 4424417 |
Method for establishing DAMA radiotelephone conversations by single-span satellite transmission |
January 3, 1984 |
| In a radiotelephone system comprising a ground central station and a plurality of peripheral stations having access to a geostationary satellite, demand-assignment multiple-access (DAMA) conversations are established by single-span transmission between subscribers of the peripheral s |
