| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 342036000 | AIR TRAFFIC CONTROL | 48 |
| 20100117887 | Multi-use bearing and range line | 05-13-2010 |
| 20100156698 | Multiple-Sensor Tracking Processing Method with Reduced Latency Time - A multiple-sensor tracking method, notably implemented in an air traffic control system, making it possible to reduce the latency time introduced by the tracking system, characterized in that the correlation ( | 06-24-2010 |
| 20100265120 | Methods and Apparatus for Integration of Distributed Sensors and Airport Surveillance Radar to Mitigate Blind Spots - Methods and apparatus for a first radar; identifying a blind spot in coverage of the first radar; providing a second radar to illuminate the blind spot, and merging data from the first and second radars using target classification prior to tracking to reduce false targets. In one embodiment, polarimetric data is used to classify targets. | 10-21-2010 |
| 20110227780 | Transmission Scheduling for ADS-B Ground Systems - System and methods for reducing redundant messages broadcast in an Automatic Dependent Surveillance—Broadcast (ADS-B) system. For a given target, a controller determines the relevant customers that should receive information about the target, identifies all of the ground stations that can be satisfactorily heard by the relevant customers, and then identifies a smaller subset of ground stations by selecting only those ground stations that are needed to reach all of the relevant customers. ADS-B messages are then broadcast to the relevant customers using only the smaller subset of ground stations. | 09-22-2011 |
| 20090243911 | METHOD AND DEVICE FOR POSITIONING AIRCRAFT, SUCH AS FOR AUTOMATIC GUIDING DURING THE LANDING PHASE - The present invention relates to a method and a device for locating aircraft. A radar ( | 10-01-2009 |
| 20100001895 | METHOD AND APPARATUS FOR DETERMINING DME REPLY EFFICIENCY - This invention relates to a method for determining the reply efficiency of a DME navigation beacon and to an apparatus for performing the method. The invention involves locating an RF receiver nearby a DME beacon to be tested. The RF receiver analyses all signals received on the interrogation frequency of that beacon to determine pulse pairs which correspond to a valid interrogation of that beacon. Other pulse events of interest may also be detected. The RF receiver also records all signals on the reply frequency of the beacon and detects all replies sent by the beacon. Particular interrogations can then be correlated with replies and the reply efficiency of the beacon determined. Several RF receivers may be located round the beacon to better provide correlation between particular interrogations and responses. | 01-07-2010 |
| 20110057830 | METHOD FOR VALIDATING AIRCRAFT TRAFFIC CONTROL DATA - A method for group travel and group communications, wherein the group travel parameters and group communications are combined for verifying and validating ADS-B data on aircraft. The full connectivity within a navigating group of aircraft allows all the group members to communicate spatial/temporal observations and collaborate in group protocols, e.g., majority voting protocol, which can determine if a received ADS-B message is corrupted or from a false target aircraft. Well-established distributed protocols based on group communications and majority voting exist for (1) detecting compromised members, i.e., false target aircraft, and (2) verifying message integrity, i.e., ADS-B data, given a minority fraction of members are compromised/colluding. Such protocols can be based on IP multicast communications over the IP networking data links available on the aircraft. | 03-10-2011 |
| 20090322586 | METHODS AND APPARATUS FOR USING INTERFEROMETRY TO PREVENT SPOOFING OF ADS-B TARGETS - Methods and apparatus for preventing spoofing of targets, such as aircraft, in an air traffic control system. In one embodiment, first and second antennas at respective ground stations can be used to receive a signal transmitted by an aircraft from which a phase signal can be generated. A position of the aircraft generate can be generated from peaks and troughs in the phase signal due to movement of the aircraft. The determined position can be compared to a position reported by the aircraft to identify spoofing of the target. | 12-31-2009 |
| 20100079328 | METHODS AND APPARATUS FOR DETECTION/CLASSIFICATION OF RADAR TARGETS INCLUDING BIRDS AND OTHER HAZARDS - Methods and apparatus for processing data from a low beam channel, a high beam channel and a weather channel to perform an altitude estimation based upon a target amplitude ratio between the low beam channel and the high beam channel and target range, and for performing target detection based upon data from the weather channel. In one embodiment, migrating birds can be more accurately detected and classified than with conventional systems. | 04-01-2010 |
| 20110248878 | METHOD FOR PROTECTING LOCATION PRIVACY OF AIR TRAFFIC COMMUNICATIONS - Methods of protecting location privacy of air traffic communications from unauthorized monitoring of aircraft locations in an uncontrolled airspace include designating a bounded region of uncontrolled airspace; ceasing transmission of a traffic beacon by each aircraft of a plurality of aircraft upon the aircraft entering the bounded region; and updating a unique identifier associated with each of the aircraft while the aircraft is traversing the bounded region. | 10-13-2011 |
| 20110163908 | VALIDITY CHECK OF VEHICLE POSITION INFORMATION - A method for validating received positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles. A a radio direction finding antenna arrangement of a receiving unit receives a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source. The bearing from the receiving unit to the radio source is estimated utilizing the radio direction finding antenna arrangement and the received signal. The distance between the receiving unit and the radio source is estimated based on the time of flight for a signal travelling there between at known speed. An estimated position of the radio source is calculated based on the estimated bearing and the estimated distance. A deviation value indicating the deviation/coincidence between the alleged position of a vehicle is determined according to the received positional data and the estimated position of the radio source. | 07-07-2011 |
| 20100295719 | System, Method, and Software for Performing Dual Hysteresis Target Association - In certain embodiments, a method includes receiving first track information comprising data for a particular aircraft track. The method further includes receiving a first radar plot comprising first location information corresponding to first aircraft identification information and first location information corresponding to second aircraft identification information. The method further includes associating the first aircraft identification information with the particular aircraft track. The method further includes accessing historical association information comprising a first association history variable corresponding to one or more previous associations between the first aircraft identification information and the particular aircraft track and a second association history variable corresponding to one or more previous associations between the second aircraft identification information and the particular aircraft track. The method further includes updating the first association history variable in response to the association of the first aircraft identification information with the particular aircraft track. | 11-25-2010 |
| 20120019407 | MULTISTATIC RADAR SYSTEM FOR AIRPORT MONITORING - The present disclosure relates to a method for monitoring targets on a runway, wherein emitting modules and receiving modules are alternately distributed along each one of longitudinal sides of the runway. Orthogonal signals are emitted in a narrowband by the emitting modules and coherently received in a coherent manner by the receiving modules. An object is detected on the runway on the basis of a distribution of the modules into meshes each including three pairs of neighbouring emitting modules and receiving modules and on the basis of a radio location of the object through triangulation and interferometry in at least one mesh. The modules are also used for analyzing a target moving on the runway, and for monitoring the trajectographies of an air target in the surroundings of the runway. | 01-26-2012 |
| 20130093612 | Automatic Monitoring Of Flight Related Radio Communications - The present disclosure is generally directed to processing air traffic controller (“ATC”) communication directed to aircraft other than the current aircraft. ATC communication is processed using speech recognition and the call sign and augmented flight information for other aircraft is identified. The corresponding aircraft icon on the display representing the aircraft on the display may be augmented by emphasizing the icon and displaying augmented flight information, along with an insignia. This information is displayed for a configurable time duration, after which the display reverts to displaying a conventional aircraft icon and associated flight information on the display. The pilot can subsequently select the aircraft icon and may be presented with a log of past ATC communications for the aircraft. | 04-18-2013 |
| 342037000 | Secondary Surveilance Radar (SSR) or Air Traffic Control Radar Beacon System (ATCRBS) | 34 |
| 20090121913 | MODE S RADAR - Disclosed is a Mode S radar which specifies an aircraft by transmitting interrogations to an aircraft A equipped with a Mode S transponder, and by then receiving and decoding replies corresponding to these interrogations. In the Mode S radar, detection reports on the aircraft A are generated in a manner that: for a Mode A code necessary for generating detection reports, when identicalness between the Mode A codes obtained in a plurality of scans after the initial acquisition of the aircraft A has been found to exist, the Mode A code thus found identical is adopted without carrying out a Mode A code interrogation (UF= | 05-14-2009 |
| 20090322588 | METHODS AND APPARATUS FOR COORDINATING ADS-B WITH MODE S SSR AND/OR HAVING SINGLE LINK COMMUNICATION - Methods and apparatus for an ADS-B system having a single link for communication and/or ADS-B/Mode-S coordination. With this arrangement, the system communication is efficiently used. | 12-31-2009 |
| 20100171647 | ENHANCED AIRCRAFT TRANSPONDER RELIABILITY - An aircraft system includes a transponder and a processor. The processor is configured to determine if the aircraft is positioned in a predetermined restricted flying zone. If the aircraft is positioned in a predetermined restricted flying zone, the processor determines if the transponder is functioning in a transmit mode. If the transponder is not functioning in a transmit mode, the processor sets the transponder to function in a transmit mode. | 07-08-2010 |
| 20110285572 | MODE 5 DETECTION PROCESS USING PHASE AND AMPLITUDE CORRELATION - A receiver in a mode 5 air traffic control system provides amplitude and phase signal outputs a digital data stream containing preamble and flight information from data transmitted from an aircraft. A signal splitter divides the amplitude and phase signal outputs between an odd channel and an even channel that carry odd-numbered pulses and even-numbered pulses, respectively. An odd channel data decoder connected to the signal splitter extracts signals encoded in the odd channel and forms an odd data stream and an even channel data decoder connected to the signal splitter extracts signals encoded in the even channel and forming an even data stream. A preamble correlator correlates the odd and even data streams with a predefined preamble mask to detect potential valid preambles, and preamble decision logic processes signals output from the preamble correlator to identify which of the preambles actually are actually valid. | 11-24-2011 |
| 20080266166 | Automatic dependent surveillance system secure ADS-S - An air traffic control automatic dependent, WAAS/GPS based, surveillance system (ADS), for operation in the TRACON airspace. The system provides encryption protection against unauthorized reading of ADS messages and unauthorized position tracking of aircraft using multilateration techniques. Each aircraft has its own encryption and long PN codes per TRACON and transmit power is controlled to protect against unauthorized ranging on the ADS-S aircraft transmission. The encryption and PN codes can be changed dynamically. Several options which account for available bandwidth, burst data rates, frequency spectrum allocations, relative cost to implement, complexity of operation, degree of protection against unauthorized users, system capacity, bits per aircraft reply message and mutual interference avoidance techniques between ADS-S, ADS-B Enroute and Mode S/ATCRBS TRACON are disclosed. ADS messages are only transmitted as replies to ATC ground terminal interrogations (no squittering). Derivative surveillance backup systems provide an anti-spoofing capability. | 10-30-2008 |
| 20100079329 | SYSTEMS AND METHODS FOR PROVIDING AN ADVANCED ATC DATA LINK - Embodiments of the present invention disclose systems and methods for providing an avionics overlay data link. Through embodiments of the present invention, existing ATC (or other) modulated signals using existing frequencies (or other frequencies) may be utilized to transmit (e.g., from an aircraft transponder) additional information in a manner that does not render the transmitted signal unrecognizable by legacy ATC equipment. In various embodiments, legacy equipment may demodulate and decode information that was encoded in the transmitted signal in accordance with preexisting standard modulation formats, and updated equipment can also extract the additional information that was overlaid on transmitted signals. | 04-01-2010 |
| 20120068878 | Method for Increasing the Time for Illumination of Targets by a Secondary Surveillance Radar - A secondary surveillance radar with rotating antenna, configured for transmitting interrogations in S or IFF mode and processing the responses to these interrogations. The radar includes an antenna having a lobe with three channels, a Sum channel, a Difference channel and a Control channel, whose transmission means are configured for transmitting interrogation messages over the Sum and Difference channels and whose reception and processing means are configured so as to carry out, aside from conventional detections by the Sum channel, detections by the Difference channel of the responses from the aircraft having been subjected to interrogation by this same channel. The radar also includes means for Space-Time Management configured for generating interrogation messages and determining whether a given message is to be transmitted by the Sum channel, by the Difference channel or by the two channels simultaneously and controlling its transmission by the corresponding transmission channel. | 03-22-2012 |
| 20110210884 | Apparatus and method to generate and detect virtual targets - An apparatus and method to generate and detect virtual targets. Position information for one or more virtual targets is calculated onboard a vehicle from real position information obtained from GPS satellites or other external or internal sources. This virtual position information is coded, mixed with a carrier frequency, amplified, and radiated to a nearby test vehicle, such as an aircraft. The amplitude of the radiated signal is adjusted such that the signal containing the virtual position information is received by the test aircraft only. The radiated signal thus adjusted is below the detection threshold of any aircraft further away. The test aircraft decodes the signal and interprets the decoded virtual position information as real aircraft in its vicinity. The coded signals may be structured to comply with the requirements of the FAA's ADS-B system. The apparatus may be mounted on the test aircraft itself, or on a nearby aircraft. | 09-01-2011 |
| 20090322589 | METHODS AND APPARATUS FOR ASSIGNMENT AND MAINTENANCE OF UNIQUE AIRCRAFT ADDRESSES FOR TIS-B SERVICES - Methods and apparatus for assigning a pseudo address to an aircraft not equipped with an ADS-B transponder and maintaining the assigned pseudo address over a number of regions each supported by different TIS-B systems. In an exemplary embodiment, each TIS-B system is assigned a range of addresses particular to the region in which the TIS-B system is located. | 12-31-2009 |
| 20090085792 | MODE S SECONDARY SURVEILLANCE RADAR - A transmitter ( | 04-02-2009 |
| 20110241925 | SECONDARY RADAR SYSTEM WITH SIGHTING FUNCTIONALITIES TYPICAL OF PRIMARY RADAR SYSTEMS - The invention concerns a radar for the control of civil aerial traffic, comprising a secondary radar ( | 10-06-2011 |
| 20110133980 | SYSTEMS AND METHODS INTEGRATED AIR TRAFFIC CONTROL MANAGEMENT - Systems and methods for integrated air traffic control management are provided. In one embodiment, a system comprises a first processing system including a FANS application for implementing a CPDLC and AFN system; a second processing system including an ATN application for implementing a PM-CPDLC and CM system; a third processing system implementing a HMI, the HMI configured to provide access to a first set of pages driven by the FANS application and a second set of pages driven by the ATN application; and an ATC Manager accessed from the HMI, the HMI configured to provide access to a third set of pages driven by the ATC manager, wherein the third set of pages selectively directs a user of the HMI to either the first set of pages or the second set of pages based on a selected ATC center. | 06-09-2011 |
| 20100026553 | Method for Reducing Multipath Propagation Effects During the Processing of Replies in Mode "S" - The processing method according to the invention is a method of processing replies from targets interrogated by a surveillance radar according to a mode S interrogation of all the targets present in the receiving lobe of the radar, whereby the different targets present in the receiving lobe of the radar are interrogated at least once, the set of the mode S reply signals received for this lobe are collected after each interrogation, a reply detection processing operation is performed for each target and errors are detected and, if necessary, corrected then the corresponding blips are extracted, and this method is characterized in that said signal quality detection and determination processing operation consists in forming a synthetic message with the set of replies to each interrogation for each target, establishing, for each bit of the message, the value and the quality of this bit and performing the error detection and correction using this synthetic message, and the three variables Σ, Δ and monopulse of all the failed replies from the same target are exploited to construct the synthetic message. | 02-04-2010 |
| 20120146833 | Secondary Surveillance Radar System for Air Traffic Control - The invention refers to a secondary surveillance radar, referred to hereinafter as SSR, system ( | 06-14-2012 |
| 20100194622 | SYSTEM AND METHOD FOR TRACKING AND IDENTIFYING AIRCRAFT AND GROUND EQUIPMENT - In accordance with one or more embodiments of the present disclosure, systems and methods disclosed herein provide for tracking of objects, aircraft, vehicles, and ground equipment in a tracking area, such as an airspace and/or an airport terminal area. One embodiment of a tracking system of the present disclosure comprises a signal monitoring component adapted to communicate with an object, such as an aircraft, when the object enters the tracking area. The signal monitoring component is adapted to transmit a monopulse beacon query signal to the object and receive a monopulse beacon response signal from the object. The tracking system further comprises an interface component adapted to process the received monopulse beacon response signal from the object, initialize a beacon transponder on the object, and assign a network address to the object. | 08-05-2010 |
| 20090322587 | SYSTEMS AND METHODS FOR PROVIDING AN ATC OVERLAY DATA LINK - Embodiments of the present invention disclose systems and methods for providing an ATC Overlay data link. Through embodiments of the present invention, existing ATC (or other) modulated signals using existing standard frequencies may be utilized to transmit (e.g., from an aircraft transponder) additional information in a manner that does not render the transmitted signal unrecognizable by legacy ATC equipment. Legacy equipment will be able to demodulate and decode information that was encoded in the transmitted signal in accordance with preexisting standard modulation formats, and updated equipment can also extract the additional information that was overlaid on transmitted signals. | 12-31-2009 |
| 20100289689 | SECONDARY SURVEILLANCE RADAR - A transmitter | 11-18-2010 |
| 20120299763 | POSITION DETERMINING METHOD AND SYSTEM USING SURVEILLANCE GROUND STATIONS - An aircraft avionics system and method for automatically determining an aircraft position. The system and method determine distances to UAT ground stations based on timing signals in transmissions from the UAT ground stations and determines one or more possible positions for the aircraft at which the aircraft is at the determined distances from respective UAT ground stations. The system and method may use three or more UAT ground stations to reduce the possible positions for the aircraft to a single possible position. The system and method also may use dead reckoning or VOR or ADF signals to reduce the possible positions for the aircraft to a single possible position. The system and method may also determine the position of an aircraft by determining true bearings to SSR ground stations and determining the possible positions for the aircraft at which the aircraft is at respective bearings to each SSR ground station. | 11-29-2012 |
| 20090167591 | PRECISION REGISTRATION FOR RADAR - A precision radar registration (PR | 07-02-2009 |
| 20110215960 | Radio receiver - A method of receiving signals from an aircraft transponder is provided that enables ADS-B signals to be decoded even though parts of the signal may be overlapped due to interference. A plurality of antennas are summed and subtracted in pairs in order to create directional signal channels, which are then assessed for the confidence of the signals received. Where a channel contains a section of the signal of low confidence, the signal from another channel may be substituted for that section. | 09-08-2011 |
| 20120242528 | RECEIVING APPARATUS AND RECEIVING METHOD - A receiving apparatus for receiving a pulse sequence signal includes a pulse decoding unit which determines, by observing, about a detection signal obtained by performing synchronous detection of a pulse sequence signal modulated by at least a pulse position modulation method, the pulse sequence signal as a pulse string transmitted by on-off keying, and applying a maximum likelihood sequence estimation method using trellis state transition defined by a time interval of the on-off keying and an on-off value concerned, an on-off value of the received pulse string, and a data decoding unit which decode, about the pulse string, information data transmitted by the pulse position modulation method. | 09-27-2012 |
| 20080231494 | High Precision Surveillance System by Means of Multilateration of Secondary Surveillance Radar (SSR) Signals - A system able to locate and identify aircraft and vehicles based on the reception and processing, with novel means and methods, of signals emitted by the transponder of the secondary surveillance radar, shortly SSR. The system has a number of fixed stations distributed in the area of interest, e.g. in the airport area; any signal (the well known SSR reply/squitter) transmitted by the on-board transponder is received by four or more stations and the measurement of three or more differences of times of arrival (TOA) permits the reconstruction of the position of the transponder in spite of the fact that the transmission time is unknown. Suitable algorithms based on optimal estimation enhance both the accuracy of TOA measurements and the accuracy of the reconstructed position. The effects of possible overlapping of signal in time are avoided or mitigated by multiple source separation techniques based on least squares algebraic processing. | 09-25-2008 |
| 20130120183 | DUAL FREQUENCY RECEIVER FOR SATELLITE-BASED POSITIONING AND ASSOCIATED METHOD OF RECEPTION - The present invention relates to a method for locating an aircraft (A | 05-16-2013 |
| 342038000 | With altitude information | 6 |
| 20080297398 | DME GROUND APPARATUS - In a DME ground apparatus, under the control of a transmission-rate monitoring control unit, the transponder unit decodes an interrogation signal it has received and generates a response signal. The transmission rate at which to transmit the response signal is monitored. If the result of the monitoring indicates that the transmission rate has reached a preset value, the response signal is transmitted from the DME ground apparatus. If the result of the monitoring indicates that the transmission rate has not reached a preset value, squitter pulses are transmitted from the DME ground apparatus. | 12-04-2008 |
| 20090212992 | METHOD AND DEVICE FOR DETECTING AN ENVIRONNING AIRCRAFT - The device ( | 08-27-2009 |
| 20090315755 | METHOD FOR DETERMINING THE POSITION, NOTABLY IN TERMS OF ELEVATION, OF A TARGET FLYING AT VERY LOW ALTITUDE - The present invention relates to a method for determining the position notably the elevation of a target flying at very low altitude. An electromagnetic detection system extracts the measurement of the elevation on the basis of the amplitude of the interference signal produced by a signal emitted directly by the target and by a signal emitted by the target towards the ground then reflected by the ground towards the radar. Embodiments of the invention can notably be used within the framework of the guidance of drones in the final landing phase. | 12-24-2009 |
| 20120154199 | OMNI-DIRECTIONAL ANTENNA AT A SECONDARY SURVEILLANCE RADAR - In one aspect, a method includes sending an interrogation request using an omni-directional antenna at a secondary surveillance radar, receiving, from responding aircraft, interrogation responses comprising identity and altitude, determining a distance to each of the responding aircraft based on a time the interrogation request was sent and a time an interrogation response was received, receiving, from a primary radar, positions of tracks, correlating the distances of each responding aircraft with the positions of the tracks to form a set of candidates by position; and sending identity, altitude and position of a track if there is one candidate from the set of candidates. | 06-21-2012 |
| 20120127015 | Multilateration System and Method - A multilateration system and method includes a plurality of receiver stations for receiving signals from an aircraft, and a controller that derives the position of the aircraft by applying a multilateration process to outputs from the receiver stations. For this purpose, the controller determines the altitude of the aircraft and selects a multilateration process that is to be used for position determination, based on the determined altitude. | 05-24-2012 |
| 20090303102 | Multilateration System and Method - In the described system the multilateration process to be applied to determine an aircraft's position is chosen on the basis of the available returns, receiver geometry and the height of the aircraft. | 12-10-2009 |
| 342040000 | With defruiting or degarbling | 5 |
| 20130082867 | ADS-B RECEIVER SYSTEM WITH MULTIPATH MITIGATION - Systems and methods for receiving ADS-B messages in environments where multipath propagation corrupts the messages or blocks the reception of the messages. An exemplary system combines RF signal processing and digital signal processing techniques to make it possible to receive ADS-B messages in the presence of multipath reflections from nearby structures and/or farther out structures. The system uses an array of horizontally spaced antennas. The RF signals from the antennas are combined by the receiver so as to form a set of beams with different azimuth antenna patterns to increase the probability that the multipath does not combine destructively with the line-of-sight path in at least one of the beams. This effectively removes multipath reflections where the delay of the multipath relative to the line-of-sight path is less than 100-200 nanoseconds. The system is also configured to remove multipath reflections with greater delays relative to the line-of-sight path. | 04-04-2013 |
| 20090140910 | METHOD AND A SYSTEM FOR FILTERING TRACKS ORIGINATING FROM SEVERAL SOURCES AND INTENDED FOR SEVERAL CLIENTS TO WHICH THEY ARE SUPPLIED - The present invention concerns a method and a system for filtering tracks originating from several sources and intended for several clients to which they are supplied. | 06-04-2009 |
| 20120038502 | Device for Detecting Pulsed Signals With Improved Sensitivity - A device for detecting non-phase-modulated pulsed signals includes at least one amplifier receiving a radiofrequency signal, and restoring at least one first signal representative of the envelope of the input signal, and a second normalized signal, characterized in that a module for estimating the stability of the phase includes means for estimating the phase of the radiofrequency signal, and means for evaluating the temporal stability of the phase, the presence of a characteristic pulse being detected if the phase is stable according to determined criteria. | 02-16-2012 |
| 20100315282 | SYSTEMS AND METHODS FOR ENHANCED ATC OVERLAY MODULATION - Embodiments of the present invention disclose systems and methods for providing an enhanced data link using overlaid modulation. Through embodiments of the present invention, existing ATC (or other) modulated signals using existing standard frequencies may be utilized to transmit (e.g., from an aircraft transponder) additional information in a manner that does not render the transmitted signal unrecognizable by legacy ATC equipment. Legacy equipment will be able to demodulate and decode information that was encoded in the transmitted signal in accordance with preexisting standard modulation formats, and updated equipment can also extract the additional information that was overlaid on transmitted signals. | 12-16-2010 |
| 20120280850 | METHOD FOR DETECTING A MESSAGE SENT BY AN INTERROGATOR OR A TRANSPONDER IN MODE S - A method for detecting a message provided with a preamble with a number of pulses in a signal sent by an interrogator or a transponder in mode S, said method including a step for decomposition of said signal into an amplitude signal and into a complex phase signal, a step for detection of said preamble by correlating the amplitude signal with a replica signal of the expected pulses, and a phase control step executed by adding together the samples of the phase signal for the duration of the pulses of said preamble and by comparing the sum obtained with a threshold. The method may include a step for time synchronization by correlation of the complex phase signal with a reference sequence formed by one or more known bits before the decoding of the data. The method applies notably to the decoding of interrogation messages borne by low-power signals. | 11-08-2012 |
