| Patent Number |
Title Of Patent |
Date Issued |
| 6252690 |
Satellite onboard data transmission system |
June 26, 2001 |
| A system for transmitting data inside a satellite comprises senders and receivers of digital signals containing the data interconnected by non-directional infra-red links. |
| 6188719 |
Radiocommunication system repeater |
February 13, 2001 |
| A repeater for use in a radiocommunication network for relaying data communications between first and second stations between which data communication via the radiocommunication network alone is impossible includes a first converter for converting a first radio signal received from t |
| 6125155 |
Broad-band digital filtering method and a filter implementing the method |
September 26, 2000 |
| A digital filter method comprising the following steps: input signal data x(n) is sampled at sampling frequency Fe and shared between and stored in Q memories of shift register of FIFO type associated with the Q branches of the filter. The filter coefficients g.sub.m (p) are stored in at |
| 6091373 |
Feed device for a radiating element operating in dual polarization |
July 18, 2000 |
| A feed device for a radiating element operating in dual polarization, for use especially in the field of space transmission, comprises a first feed line penetrating into a first cavity located beneath said radiating element, and a second feed line disposed in a configuration orthogonal t |
| 6081559 |
Apparatus for detecting the presence or the absence of a digitally modulated carrier, a correspo |
June 27, 2000 |
| The invention relates to apparatus for detecting the presence or the absence of a signal carrier wave received by a receiver. The carrier wave is modulated by a digital signal at a symbol clock frequency. According to the invention, the apparatus includes:a non-linear circuit receiving t |
| 6038447 |
Method of handing off traffic in a low orbit satellite communication system serving terminals an |
March 14, 2000 |
| In a method of handing off traffic in a low orbit satellite communication system serving terminals, a terminal being connected to a terrestrial communication network by means of a connection station, handing off of the satellite-terminal and satellite-connection station links is possible |
| 6032902 |
Constellation of non-geostationary satellites providing permanent coverage |
March 7, 2000 |
| The invention relates to a communications and/or navigation system based on a constellation of non-geostationary satellites in orbit around the terrestrial globe. The constellation has satellites grouped in pairs, and has orbital planes that are also grouped in pairs. The pairs of orbita |
| 6018658 |
Personal communications via low-orbiting moving and geostationary satellites |
January 25, 2000 |
| Apparatus for providing high reception capacity to hand-held or mobile stations using moving satellites in low orbit. The system makes use of one or more geostationary satellites which provide broad band transmission to the users of hand-held or mobile stations. Only the data addressed t |
| 5995807 |
Method of switching a channel from a first propagation path to a second propagation path |
November 30, 1999 |
| The invention provides a method of switching a call set up between a first station and a second station from a current propagation path to a following propagation path. The method includes the following steps:a value representative of signal-to-noise ratio is measured for each of said pr |
| 5982328 |
Device with radiating elements |
November 9, 1999 |
| A device having radiating elements includes a support structure defining a plurality of unit cells, at least one electronic circuit, connection for supplying at least one input signal to the electronic circuit and at least one radiating element connected to an output of the electronic ci |
| 5963845 |
Satellite payload with integrated transparent channels |
October 5, 1999 |
| A satellite payload having d transparent channels, a first plurality d of band-pass channel filters IMUX of bandwidth .delta. that filter received signals, frequency converters, a plurality k of channel amplifiers (k.gtoreq.d), power amplifiers and a second plurality p of channel filters |
| 5927652 |
System for observation of geostationary satellites, use of a system of this kind and correspondi |
July 27, 1999 |
| The invention concerns, in particular, a system of observation of geostationary satellites (10.sub.1 -10.sub.n). In accordance with the invention, this system comprises at least one observation satellite (15) in an observation orbit (16, 17) near the geostationary orbit (11), this ob |
| 5923283 |
Altimetric type measurement method for use on a satellite |
July 13, 1999 |
| An altimetric type measurement method for use on a satellite transmits a pulse towards the surface of the sea and carries out frequency transformation on the return signal resulting from the reflection of this pulse at the surface of the sea. This produces a spectral signal of sample |
| 5917388 |
Compact microwave module |
June 29, 1999 |
| The invention provides a microwave module including a plurality of stacked elementary structures forming a unit, each elementary structure comprising a bottom dielectric layer on a top surface of which an integrated circuit (20, 21) is disposed, and a top dielectric layer covering the ci |
| 5897156 |
Method of protecting a planetary rover vehicle |
April 27, 1999 |
| Method of protecting a planetary rover vehicle, that travels in a manner that is at least partially autonomous, against an exterior environment that has become hostile wherein the vehicle takes shelter and emerges from shelter against the exterior environment of its own accord, respectiv |
| 5881367 |
Method of regulating the power of a signal transmitted by a first station to a second station in |
March 9, 1999 |
| In a telecommunication network, the power of a first signal transmitted via a satellite by a first station to be received in the form of a second signal by a second station is regulated. At a given time, a value representative of a signal-to-noise ratio of the second signal is predic |
| 5828947 |
Method of power regulation in a satellite telecommunication network with at least two satellites |
October 27, 1998 |
| The invention provides a method of regulating the power of transmission between first and second stations in a multiple satellite visibility satellite telecommunication network. The method comprises the following cyclic steps: regulation, for each of said N channels, of an isolated t |
| 5815111 |
Method of reducing ambiguities in synthetic aperture radar, and radar implementing the method |
September 29, 1998 |
| A method of defocusing range ambiguities in a pulse radar, in particular of the SAR type, the method comprising the following steps:radar pulses are spread on transmission by using a plurality of "chirp" rules for varying the frequency of the transmitted wave as a function of time;during |
| 5796370 |
Orientable antenna with conservation of polarization axes |
August 18, 1998 |
| An antenna is orientable, directional and capable of use as a transmit and/or receive antenna. It includes at least one reflector, at least one source of electromagnetic radiation including means for exciting the source with two orthogonal linear polarizations and a mechanical system |
| 5734349 |
High capacity multibeam antenna with electronic scanning in transmission |
March 31, 1998 |
| The invention provides a multibeam antenna comprising:an array 11 of N.sub.e elementary sources 31; energy-focusing optical means comprising a reflector 10 or a lens; the array being situated in the focal zone of said focusing means: and a feed and control circuit cooperating with the N. |
| 5675288 |
Method of linearizing a non-linear amplifier, linearization circuit and amplifier including a ci |
October 7, 1997 |
| A linearization circuit for a non-linear amplifier optimizes the overall efficiency (>50%). To achieve high efficiency the amplifier is operated in class "E" or class "F" and near saturation, causing phase and amplitude non-linearity. Phase non-linearity is corrected conventionally by |
| 5673010 |
Power distributor system and power distributor for microwave signals having recurring hierarchic |
September 30, 1997 |
| A power distributor for microwave signals has n inputs and n outputs, n/2 coupler elements, four power distributor elements each having n/2 inputs and n/2 outputs. The inputs of the first and third distributor elements correspond to respective inputs of the distributor and the outputs of |
| 5668556 |
Low-orbit satellite communications system for terminals |
September 16, 1997 |
| The present invention relates to a communications system between low-orbit satellites and terminals, in which the beams (12) of each service area (14) are illuminated according to a beam-hopping spatial scanning. For each satellite and for each terminal transmission and reception are |
| 5652597 |
Electronically-scanned two-beam antenna |
July 29, 1997 |
| An electronically-scanned two-beam antenna designed for being installed on board a moving platform, and in particular a satellite. The antenna of the invention comprises a single, complex reflector whose reflectivity is responsive to the polarization with which it is illuminated, and |
| 5625867 |
Method of handing off traffic in a low orbit satellite communication system serving terminals an |
April 29, 1997 |
| In a method of handing off traffic in a low orbit satellite communication system serving terminals, a terminal being connected to a terrestrial communication network by means of a connection station, handing off of the satellite-terminal and satellite-connection station links is possible |
| 5576660 |
Broadband predistortion linearizer with automatic temperature compensation for microwave amplifi |
November 19, 1996 |
| A predistortion linearizer for microwave power amplifiers has a linear channel and a non-linear channel. Both channels are made up of the same units. Each channel includes a variable phase-shifter, a variable attenuator and an amplifier. Each channel can further include a fixed atten |
| 5565820 |
Pulse width power supply modulator |
October 15, 1996 |
| A pulse width modulation type power supply modulator capable of operating at high switching frequencies (>10 MHz) is achieved by eliminating resonant circuits which limit the maximal switching frequency. The modulator includes a power circuit including a power transistor, a first |
| 5563919 |
High-throughput digital filtering method and apparatus for performing the method |
October 8, 1996 |
| A high-throughput filtering method and corresponding apparatus in which each output sample sn is determined by weighting N input samples xi by multiplying the input samples by N coefficients, where the N coefficients are each decomposed into a set of coordinates, each coordinate corr |
| 5561837 |
Memory relay system for observation satellites |
October 1, 1996 |
| The invention proposes a memory relay system for observation spacecraft, for example observation satellites or interplanetary probes. The object of the invention is to alleviate the absence or possible failure of onboard memory of these craft. The system of the invention provides a subst |
| 5539420 |
Multilayered, planar antenna with annular feed slot, passive resonator and spurious wave traps |
July 23, 1996 |
| A plane antenna suitable for space applications in particular comprises a passive resonator coupled to a feedline by a looped slot. |
| 5530720 |
Method of calculating weighting coefficients for an analytical digitizer for signal processing, |
June 25, 1996 |
| An analytical digitizer for signal processing includes a sampler and an analog/digital converter. A first calculating device supplies a first component of the signal made up of a sequence of digital values. Each value is calculated by adding 2h+2 value supplied by the converter weigh |
| 5489913 |
Miniaturized radio antenna element |
February 6, 1996 |
| A miniaturized radio antenna element for use at VHF and UHF is designed to operate well short of resonance. It comprises a small flat cavity in the surface of which is formed at least one radiating slot very much smaller than a normal resonant slot. However, an impedance matching circuit |
| 5477229 |
Active antenna near field calibration method |
December 19, 1995 |
| In a method of calibrating an active antenna the active elements of a transfer function matrix are measured using a near field probe for each radiating source of the antenna. The probe is placed in front of each source in succession and each source is excited in turn with the opposite |
| 5434580 |
Multifrequency array with composite radiators |
July 18, 1995 |
| A multifrequency radiating device comprising at least one radiating element (11) of a first type and at least one radiating element (12) of a second type, the elements being associated on a common surface (10) in order to constitute an array antenna. The radiating elements of the first t |
| 5428814 |
Space communications apparatus employing switchable band filters for transparently switching sig |
June 27, 1995 |
| The invention relates to switchable band filter apparatus for switching signals on-board a satellite, enabling signals of different and unforeseeable bandwidths to be switched between multiple input ports and multiple output ports. The invention also provides various payload architec |
| 5416805 |
Receiver for receiving frequency modulated signals and having a controlled acquisition band |
May 16, 1995 |
| A receiver for receiving frequency modulated signals and having a controlled acquisition band, the receiver including: a phase-locked loop (PLL) demodulator (40); a frequency translation circuit (30) including an intermediate frequency filter (36); a recentering loop (44) for recente |
| 5410731 |
Satellite telecommunications facility capable of covering a plurality of coverage areas |
April 25, 1995 |
| A direct television broadcasting satellite facility (S1, S2, S3) having at least two coverage areas (T1, T2). At the beginning of the life of the facility, with present Standards, only two satellites (S1, S2) each having two beams (F1 & F2 and F'1 & F'2) are used, each satellite having 1 |
| 5373298 |
Method of estimating the error in the calculation of the position of a mobile by a GPS receiver, |
December 13, 1994 |
| In a method of calculation by a GPS receiver of the position of a mobile in space and time relative to a predetermined frame of reference, the position is calculated from data supplied by at least four GPS satellites selected by the GPS receiver to form a calculation constellation. The |
| 5327147 |
Microwave array antenna having sources of different widths |
July 5, 1994 |
| A microwave array antenna comprises a plurality of like unit sources whose width increases progressively from the center of the array towards its ends and which are disposed relative to each other in such a way that substantially no illumination gaps are created in the array. |
| 5321413 |
Offset active antenna having two reflectors |
June 14, 1994 |
| An offset type active antenna having two reflectors in a periscopic configuration. A radio lens is provided at the focii of the two reflectors. It comprises a collector and a primary array that is considerably larger in size than the collector. The "small" sources of the collector ar |
| 5309124 |
Analog variable phase shifter with active matching circuits |
May 3, 1994 |
| An analog variable phase shifter comprises a phase shift circuit and associated active inlet and outlet matching circuits. The phase shift circuit includes a transistor with negative feedback, and the inlet and outlet matching circuits are of the type used for matching a wideband mic |
| 5289193 |
Reconfigurable transmission antenna |
February 22, 1994 |
| The invention relates to a reconfigurable transmission antenna comprising a reflector (10) for energy focussing, and an array (11) of source elements situated in the focal region of the reflector, so that the electromagnetic field is synthesized in said region, wherein a spot (SPi) is th |
| 5264852 |
Satellite equipment for measuring the backscatter coefficient of the sea |
November 23, 1993 |
| Satellite radar apparatus measures the backscatter coefficient of the sea to determine the speeds and directions of winds at sea. The apparatus implements three aiming directions per swath with the track thereof on the Earth being parallel. The radar technique used operates by pulse |
| 5251497 |
Test device for equipment in motion |
October 12, 1993 |
| A test apparatus for testing equipment in motion comprises a test device (1) for testing a piece of equipment (2) and a mobile enclosure (3) containing a gas lighter than air and surrounding the test equipment (2) located on the test device (1). |
| 5248980 |
Spacecraft payload architecture |
September 28, 1993 |
| Spacecraft payload architecture which includes an array (10) of radiating elements preceded by an amplification stage (17) and a focusing optical system (11), characterized in that the architecture is adapted to a telecommunication mission by taking into account the overall requirements |
| 5235295 |
Microwave equalizer suitable for aerospace applications |
August 10, 1993 |
| A microwave equalizer is used in aerospace applications to correct the gain/frequency response of a microwave system, in particular in a given range of temperatures. To obtain a variation opposite to that of the microwave system by introducing absorption at the operating frequency, it |
| 5233364 |
Dual-polarized microwave antenna element |
August 3, 1993 |
| A microwave antenna element suitable for constituting one of the elements of an array, the antenna element being capable of transmitting or receiving two orthogonally-polarized microwaves. The antenna element is constituted by a cavity containing two orthogonal excitation probes sepa |
| 5227749 |
Structure for making microwave circuits and components |
July 13, 1993 |
| The invention relates to a structure for making microwave circuits and components, in which the mechanical and electrical functions are integrated overall but dissociated locally. The invention is particularly suitable for space applications. |
| 5220334 |
Multifrequency antenna, useable in particular for space telecommunications |
June 15, 1993 |
| The present invention relates to a multifrequency antenna comprising a microstrip patch first antenna (10, 11, 12) operating at one or more frequencies, and a second antenna (17) disposed in front of the antenna and using the same radiating surface and operating at a different freque |
| 5216384 |
Programmable amplifier device |
June 1, 1993 |
| An amplifier device has a gain programmable between 2.sup.n and 2.sup.n-1 in steps of 2.sup.p where p<n and n is the number of gain control bits. The device comprises a plurality of stages having two gain values selectable by a control bit and at least two identical stages having a |
