Abstract: An airborne apparatus that employs an advanced computer to analyze bird and aircraft positioning data, programmed to issue a warning about an impending strike, thereby creating the ultimate Bird-Aircraft Strike Prevention System. This system will constantly process the bird positioning data gathered by the Radar/Infrared sensors. In case of a bird-aircraft strike danger the system will immediately alert the pilot as well as Air Traffic Control, and, compute the necessary course correction required to avoid the collision. The advantages of the system include the ability to prevent bird strikes and instantaneously compute an alternative course or action necessary to avoid the bird-aircraft impact. Additionally, because the IBSPS is capable of being airborne, the aircraft will be protected from bird-strikes throughout the entire flight, even in absence of ground systems.

Abstract: A display generator for providing obstacle avoidance guidance to a pilot is described. The display generator receives data from an obstacle avoidance dispatcher and resolver module, a hybrid ground collision avoidance module, a hybrid air collision avoidance module, a display control panel, and a navigation management module. The display generator generates obstacle avoidance display image video data, which includes symbology that represents a location of one of a predicted ground collision, a predicted air collision, and an induced collision. The display generator provides the obstacle avoidance display image video data to an image rendering device, which a pilot can use to avoid both air and ground obstacles.

Abstract: A system for preventing light pollution includes one or more radar units that monitor for vehicles in a volume surrounding or containing one or more obstructions having one or more obstruction lights. A master radar detection processing unit receives sensed radar detection information from the one or more radar units with associated radar signal processing units and determines whether a vehicle is present within the monitored volume. A plurality of obstruction light controller units are interconnected in a network, such as a wireless network. Each obstruction light controller unit turns on an obstruction light when a vehicle enters the monitored volume or a failure condition exists, and turns off the obstruction light when the vehicle has vacated the monitored volume and no failure condition exists. The one or more radar units can transmit sensed radar detection information to a master radar detection processing unit via the network.

Abstract: Using a radar to detect a known target likely to be positioned at approximately a predetermined height close to other targets, these other targets also being positioned at approximately the predetermined height. A first phase of detecting the known target is carried out by performing an azimuth scan. When the known target has been detected at a certain distance Di at a certain azimuth angle ?az, a second detection phase is carried out at said azimuth angle ?az and at an elevation angle ?EL corresponding to that of an object situated at said distance Di at the predetermined height. The target is said to be detected if it is detected at the elevation angle ?EL at a distance D approximately equal to the distance Di.

Abstract: An aircraft weather radar system for displaying an indication of a threat level presented by an obstacle to the aircraft on an electronic display. The weather radar system includes a radar antenna configured to receive radar returns from a radar sweep. The weather radar system additionally includes processing electronics configured to determine a movement vector of the obstacle using the radar returns. The processing electronics are further configured to determine the threat level of the obstacle to the aircraft based on the determined movement vector, to generate parameters for an indication based on the determined threat level and to cause the indication to be displayed on an electronic display.

Abstract: The present invention provides an aircraft collision alarm system and method. The method includes the steps of collecting aircraft position information for aircraft in a given area and digitally encoding this aircraft position information. This aircraft position information is then transmitted on an audio sub-carrier over the voice communications channel of a VOR to the aircraft. The aircraft receives and processes the digitally encoded information and alerts the pilot if a collision alarm situation is present.

Abstract: A method for wirelessly communicating data between a plurality of avionics units on an aircraft and a data communication apparatus. The method includes wirelessly communicating download data for one avionics unit from the data communication apparatus to an aircraft data services link in the aircraft; automatically switching a communication path from the aircraft data services link to the avionics unit responsive to the download data; and electronically communicating the download data from the data communication apparatus to the avionics unit via the automatically switched communication path.

Abstract: A land use compatibility software module uses an existing suite of airport management programs to generate exception reports for FAA Part 77 land use compatibly surveys. Land use compatibility management is a manually intensive and time-consuming process. The noise officer may have to compute whether a proposed structure violates FAA's obstruction clearance criteria as set out in FAA's standard for obstacle clearance zones (Part 77). With these three-dimensional zone shapes entered into AirScene™, the user may enter lat/long and height data for potential obstructions, such as cellular telephone towers as mentioned in the above example. The system will plot the potential obstructions on the map and will determine whether or not the height and proposed position of the tower violates the FAA's obstruction criteria for that runway. The system may be used to generate “exception reports” for proposed structures.

Abstract: The device (405) for behavior simulation of a radio navigation system, without the latter being installed on an aircraft, comprising a means (410) for determining a position of the aircraft, characterized in that it further comprises: a means (415) for automatically determining at least one radio navigation beacon of a station on the ground depending on said position of the aircraft, and for selecting a radio navigation beacon of an automatically determined station on the ground, a means (420) for calculating at least one physical quantity value linked to the relative position of the aircraft relative to the selected beacon and a means (425) for presenting, on a display means of the aircraft cockpit, each calculated physical quantity value and the identifier of the selected beacon.

Abstract: A radar system comprises a plurality of antenna sub-systems, each operable to transmit and receive radio frequency (RF) signals in a corresponding sector, wherein the plurality of antenna sub-systems are positioned such that the corresponding sectors cover a total range of about 180 degrees to about 360 degrees without rotation of the radar system. The radar system also comprises shared backend circuitry coupled to each of the plurality of antenna sub-systems and operable to process signals from each of the plurality of antenna sub-systems to detect the presence of an obstacle in one of the corresponding sectors.

Abstract: Systems and methods for reducing radar target processing. The systems include a processor configured to receive a first input from a cooperative surveillance source and a second input from a radar device. The first input includes cooperative target information, the second input includes cooperative and non-cooperative target information, and the processor is configured to process the first and second inputs to remove cooperative target information from the second input based on the first input to generate a modified radar output for use by an output device. The methods include receiving a first input including cooperative target information from a cooperative surveillance source, receiving a second input including cooperative and non-cooperative target information from a radar device, processing the first and second inputs to remove cooperative target information from the second input based on the first input, and generating a modified radar output based on the processed first and second inputs.

Abstract: 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.

Abstract: A collision sense and avoidance system and method and an aircraft, such as an Unmanned Air Vehicle (UAV) and/or Remotely Piloted Vehicle (RPV), including the collision sense and avoidance system. The collision sense and avoidance system includes an image interrogator identifies potential collision threats to the aircraft and provides maneuvers to avoid any identified threat. Motion sensors (e.g., imaging and/or infrared sensors) provide image frames of the surroundings to a clutter suppression and target detection unit that detects local targets moving in the frames. A Line Of Sight (LOS), multi-target tracking unit, tracks detected local targets and maintains a track history in LOS coordinates for each detected local target. A threat assessment unit determines whether any tracked local target poses a collision threat. An avoidance maneuver unit provides flight control and guidance with a maneuver to avoid any identified said collision threat.

Abstract: A system for preventing light pollution includes one or more radar units that monitor for vehicles in a volume surrounding or containing one or more obstructions having one or more obstruction lights. A master radar detection processing unit receives sensed radar detection information from the one or more radar units with associated radar signal processing units and determines whether a vehicle is present within the monitored volume. A plurality of obstruction light controller units are interconnected in a network, such as a wireless network. Each obstruction light controller unit turns on an obstruction light when a vehicle enters the monitored volume or a failure condition exists, and turns off the obstruction light when the vehicle has vacated the monitored volume and no failure condition exists. The one or more radar units can transmit sensed radar detection information to a master radar detection processing unit via the network.

Abstract: An antenna is provided, in combination with an associated switch array, the antenna comprising a number of antenna elements mounted above a ground plane for providing coverage over a predetermined range of angles in azimuth using a number of beams. Each of the antenna elements is connected to a switch in the switch array and the switch array is operable to connect selected pairs of the antenna elements to a signal path to thereby generate each of the different beams, at the same time connecting unselected antenna elements to ground.

Abstract: An embodiment of the present invention provides a collision avoidance system for a host aircraft comprising a plurality of sensors for providing data about other aircraft that may be employed to determine one or more parameters to calculate future positions of the other aircraft, a processor to determine whether any combinations of the calculated future positions of the other aircraft are correlated or uncorrelated, and a collision avoidance module that uses the correlated or uncorrelated calculated future positions to provide a signal instructing the performance of a collision avoidance maneuver when a collision threat exists between the host aircraft and at least one of the other aircraft.

Abstract: This system for displaying, on the flight deck of an aircraft travelling on the surface of an airport, an airport map mentioning the surface traffic, for the purpose of a taxiing aid and protection of the ground movements of the aircraft, shows on the airport map only the traffic occupying the airport thoroughfares close to the aircraft, this closeness being defined by the existence of a joining path comprising a number of thoroughfare sections that is less than an arbitrary limit of the order of 1 or 2.

Abstract: Provided is a secondary surveillance radar with an improved capability of eliminating an unnecessary Mode A/C target report, which includes a transmission unit transmitting interrogations, a reception unit receiving replies, from a transponder, corresponding respectively to the interrogations, and a signal processing unit generating a Mode S target report and a Mode A/C target report from the replies. The radar also includes a combiner generating a Mode S track and a Mode A/C track respectively from the Mode S and the Mode A/C reports, and then judging whether the Mode S report and the Mode A/C report are of the same target on the basis of the Mode S and the Mode A/C tracks. When the Mode S and the Mode A/C reports are of the same target, the combiner rejects the Mode A/C report.

Abstract: Ground clutter is effectively separated from true signals echoed by a cable in the flight path of an aircraft, by encoding a transmitted pulse wave in a radar system with at least one transmit (TX) coding sequence, so that received signals echoed by the cable on which the pulse is incident and associated ground clutter are orthogonal or separable from one another. The TX coding sequence is altered into two receive (RX) coding sequences one of which corresponds to the cable and the other to the ground clutter. The two RX coding sequences are then correlated with the received signals, thereby separating the true signals echoed by the cable from the associated ground clutter.

Abstract: A surveillance and guidance method and system for use with autonomously guided, man-on-the-loop or man-in-the-loop guided vehicles where the presence of obstacles must be considered in guiding the vehicle towards a target includes a navigation system configured to determine the position of the vehicle on which it is equipped. A communication system is configured for data exchange between the vehicle, neighboring vehicles and ground stations. A surveillance system is configured to detect and locate fixed or moving targets and obstacles. A computer is configured to track the position of targets and obstacles and to provide guidance commands or 4D flight paths to perform collision avoidance with respect to traffic regulations and procedures, and operational airspace restrictions. Additional computer tasks include station keeping or interception of targets. A command and control system is configured to interact with a user interface and control the vehicle's actuators.

Abstract: A method of generating an image of a volume ahead of an aerial vehicle is provided. The method comprises determining a position of the aerial vehicle and generating a terrain image corresponding to ground features correlated to the position of the aerial vehicle. Obstacle data pertaining to a set of obstacles ahead of the aerial vehicle is determined with a forward looking sensor. An obstacle overlay image is generated and overlain onto the terrain image to generate a composite image.

Abstract: A method and apparatus for at least semi-autonomously controlling a vehicle so as to avoid collisions are provided. A sensor is utilized to scan an area proximate the vehicle for a potential object of collision. The apparatus calculates navigational states of the potential object of collision relative to the vehicle to determine that the vehicle is on a course to enter within a predetermined miss distance relative to the potential object of collision. The apparatus alters the course of the vehicle based on the calculated navigational states.

Abstract: A TCAS receiver includes an antenna, an analog to digital converter (ADC), and a FPGA. The antenna receives an ADS-B squitter signal. The ADC converts the signal to a digital signal. The FPGA uses matched filters for matching at least a portion of the digital signal to a message, thereby increasing ADS-B squitter sensitivity.

Abstract: A mobile radio communication system estimates the positional relationship between an own moving terminal and another moving terminal around a view obstruction. If the absolute value of the difference between detected reception power levels is lower than a first power threshold value, the own moving terminal determines that the other moving terminal is positioned within the visual range of the own moving terminal, the distance from the own moving terminal to the other moving terminal being shorter than a predetermined distance BP, or that the other moving terminal is positioned outside thereof, the distance to the visual range of the own moving terminal being shorter than the predetermined distance BP. Also if the absolute value is higher than or equal to the first power threshold value, the own moving terminal determines in a similar manner.

Abstract: Systems and methods for runway status indication and related traffic information displays and filtering are disclosed. In one embodiment, the method for displaying runway status includes defining a monitored volume for each of one or more runways, determining a runway status for each of the one or more runways based on at least one of a state of at least one traffic vehicle and a monitoring vehicle state with respect to each monitored volume. The method continues with selecting at least one runway status for display based on the state of the monitoring vehicle. The method then presents the at least one runway status within the monitoring vehicle. In an additional embodiment, each monitored volume is based on a length of a corresponding runway, a width of the corresponding runway, and a predetermined altitude above the corresponding runway.

Abstract: Ground clutter is effectively separated from true signals echoed by a cable in the flight path of an aircraft, by encoding a transmitted pulse wave in a radar system with at least one transmit (TX) coding sequence, so that received signals echoed by the cable on which the pulse is incident and associated ground clutter are orthogonal or separable from one another. The TX coding sequence is altered into two receive (RX) coding sequences one of which corresponds to the cable and the other to the ground clutter. The two RX coding sequences are then correlated with the received signals, thereby separating the true signals echoed by the cable from the associated ground clutter.

Abstract: Systems and methods for producing an advisory if barometric altitude transition setting needs adjusting in an aircraft. In one embodiment, the method determines transition altitude, receives an uncorrected altitude, compares the uncorrected altitude to the transition altitude and to corrected altitude, and outputs a barometric altitude transition setting advisory based on the comparison between the uncorrected altitude and the transition altitude. The comparison determines if the uncorrected altitude is greater than the determined transition altitude and the advisory is output if the uncorrected altitude is determined to be greater than the transition altitude and the uncorrected altitude differs from the corrected altitude by a threshold amount. A delay is provided between the comparison of the uncorrected altitude to the transition altitude and the comparison between the uncorrected altitude and the corrected altitude.

Abstract: Methods and apparatuses process sensing signals. A method for redrawing a sensing image when a range is or has been changed, according to one aspect of the present invention, records the sensing image and outputs the sensing image to a display; records additional information displayed upon a screen and outputs the additional information to the display; computes a new image from the recorded sensing image using an image manipulation computer function, so that the computed image fits a new scale of the changed range, and recording the computed image; and computes changes to the recorded additional information to adjust the additional information to the new scale of the changed range, and records the computed additional information.

Abstract: A device for determining a maximum lateral separation of a follower craft with respect to a lead craft. The device includes a first unit for deducing automatically from minimum turning radii of a lead craft and from a maximum turning radius of a follower craft, the maximum possible lateral separation of the follower craft with respect to the lead craft, on each side of the trajectory of the latter.

Abstract: Methods and systems for a position indicating display system for an aircraft are provided. The system includes a map display unit configured to display a map representative of an area being traversed by the aircraft, and an overlay comprising an own ship depiction, said overlay displayed on the map for a period of time in response to an input from at least one of a user and an aircraft sensor.

Abstract: My innovated aircraft doesn't need pilots to fly in the designated airport; rather, it needs air worthy aircraft and airport's communication/navigation systems. By responding with the communication/navigation system of the airport and inbuilt system of my innovated aircraft, it can do all the jobs of the present aircraft but without requiring any pilot to fly. Therefore, aircraft accident due to pilot error, hijacking etc can be controlled on the aircraft and air transport will be safer than that of present aircraft.

Abstract: An aircraft cockpit display device for information concerning surrounding traffic includes devices to receive information coming from outside the aircraft, to know the flight parameters of the aircraft, to calculate projected trajectories of the aircraft and of a detected aircraft in the immediate vicinity, and to display a representation of the surrounding traffic through symbols and potential messages based on instructions received. A display command device is connected to an on-board calculator to know the flight phase of the aircraft. The display command device has a filtering device to define for each flight phase and/or crew task the nature and the level of information to be displayed.

Abstract: In an embodiment, a quantity smoother includes a first stage and a second stage. The first stage is operable to receive a sequence of raw samples of a quantity and to generate from the raw samples intermediate samples of the quantity, the intermediate samples having a reduced level of fluctuation relative to the sequence of raw samples. The second stage is coupled to the first stage and is operable to generate from the intermediate samples resulting samples of the quantity, the resulting samples having a reduced level of fluctuation relative to the sequence of intermediate samples. For example, such a quantity smoother may be part of a target-ranging system on board a fighter jet, and may smooth an error in an estimated target range so that the fighter pilot may more quickly and confidently determine in his head a range window within which the target lies.

Abstract: A method of transitioning from a complex response flight state to a ground operation control state. Pilot intent is determined through collective position information to control the transition. An independent cockpit switch activates an emergency surface contact transition function for use with a fly-by-wire (FBW) flight control system. Once the surface contact transition function is active, FBW control laws transition from a fully augmented flight state, through an augmentation deactivation state and into the surface contact state.

Abstract: A collision and conflict avoidance system for autonomous unmanned air vehicles (UAVs) uses accessible on-board sensors to generate an image of the surrounding airspace. The situation thus established is analyzed for imminent conflicts (collisions, TCAS violations, airspace violations), and, if a probable conflict or collision is detected, a search for avoidance options is started, wherein the avoidance routes as far as possible comply with statutory air traffic regulations. By virtue of the on-board algorithm the system functions independently of a data link. By taking into account the TCAS zones, the remaining air traffic is not disturbed unnecessarily. The system makes it possible both to cover aspects critical for safety and to use more highly developed algorithms in order to take complicated boundary conditions into account when determining the avoidance course.

Abstract: A method and a device are described for acquiring driving data of a vehicle. Moreover, a computer program and a computer program product are put forward for carrying out the method. In the method described, a three-dimensional, kinematic vehicle model is calculated, including linear-motion-dynamics signals and lateral-motion-dynamics signals. This model can be utilized for reconstructing the vehicle movement.

Abstract: The automatic vehicle braking device is equipped with a braking force control processing portion which, based on the judgment result of a collision judgment processing portion and the judgment result of a steering avoidance judgment processing portion, imparts a turning property in a direction of head-on collision to the vehicle when the lateral position of the obstacle with respect to a travel route curve is large in a condition in which the driver is unconscious of a high possibility of collision between the vehicle and the obstacle and has taken no steering avoidance action yet. As a result, it is possible to reduce the speed of the vehicle and, at the same time, mitigate the damage suffered by the vehicle occupants at the time of collision.

Abstract: A device for determining the bearing of a vehicle using Inertial Reference Unit (IRU) and Traffic Alert Collision Avoidance System (TCAS) data. The device includes a means to communicate with the vehicle such as a transmitter, receiver, and antenna. The device also includes a processor configured to receive the IRU and TCAS data from the vehicle via the communication means and then generate a bearing value using the received data.

Abstract: A direction finding antenna system for determining the relative bearing of a second aircraft from a first aircraft in conjunction with Distance Measuring Equipment (DME). The system includes a first antenna and a second antenna located on a top surface of the first aircraft, spaced apart along a first axis, as well as a third antenna and a fourth antenna located on a bottom surface of the first aircraft, spaced apart along a second axis orthogonal to the first axis. The system further includes a transmitting, receiving, and processing system coupled to the first, second, third, and fourth antennas, wherein the transmitting, receiving, and processing system is configured to transmit DME interrogations, receive DME replies, and process the DME replies to determine the relative bearing of the second aircraft from the first aircraft.

Abstract: A method for processing signals of an airborne radar includes a correction of the erroneous angle of pointing of the radar beam, comprising an evaluation of the error in the pointing angle for a constant height of the aerial transporter. For a given angle of scan, the method carrys out at least two series of measurements of the power of the echoes returned following the emission of radar signals, each series being associated with a given distance-bin, the measurements being dependent on the angle of pointing of the radar antenna, formulates a vertical profile of the power of the echoes returned for each series of measurements, and then on the basis of each vertical profile, measures the pointing angle corresponding to a power of the echoes returned by the ground alone, and calculates the error in the pointing angle on the basis of the measured pointing angles.

Abstract: A method and a system for avoiding collisions between aircraft. The method includes computing a default fly out maneuver regarding how the aircraft shall be maneuvered during a fly out action, predicting a fly away path including a prediction of the position of the aircraft during the fly out maneuver, sending information about the own fly away path to the other aircrafts, receiving information about fly away paths from the other aircrafts, detecting an approaching collision, and activating the fly out maneuver upon detecting an approaching collision. The method further includes carrying out the following steps after activation the fly out maneuver: receiving the current position of the aircraft, and calculating a compensated fly out maneuver for the aircraft based on the current position of the aircraft, the previously predicted position, and the default fly out maneuver.

Abstract: A method and system for locating aircraft with respect to airport runways and taxiways, generating and annunciating situational awareness advisories as a function of aircraft state parameters relative to a determination of the aircraft location.

Abstract: An antenna system for an airborne radar system with a dorsal unit having two opposing long sides extending in a height direction (Z) and a longitudinal direction (X), and two opposing short sides extending in a lateral direction (Y) and the height direction (Z), and an upper side opposing a bottom side each extending in the longitudinal direction (X) and the lateral direction (Y). The antenna system comprises antenna devices being interspaced and mounted in connection to one of the short sides or both the short sides and extending in the height direction (Z). Each of the antenna devices comprises a waveguide board.

Abstract: A radar system comprises a transmitter antenna configured to transmit a radio frequency (RF) signal, a first receiver antenna, and a second receiver antenna. Each of the first and second receiver antennas are configured to receive a reflection of the RF signal, wherein the first and second receiver antennas are synchronized and separated by a vertical distance. The radar system also comprises radar processing circuitry configured to control transmission of the RF signal from the transmitter antenna and to determine an elevation of an object reflecting the RF signal based on the phase difference between the reflected RF signal received by the first receiver antenna and the reflected RF signal received by the second receiver antenna; wherein the transmit antenna, first receiver antenna, and second receiver antenna are operable to continuously rotate 360 degrees along an azimuth angle without rotating along an elevation angle.

Abstract: The invention relates to a method for pre-detecting responses in a secondary radar. It applies in particular to the detection of mode S responses. An aim of the invention is to process the signals received before decoding the responses so as to allow the detection of mixed responses, and avoid the detection of ghost responses. For this purpose, the invention has in particular as subject a method for pre-detecting responses in a secondary radar, the responses to be pre-detected comprising a message coded by a modulated signal, characterized in that the presence of a signal exhibiting modulation characteristics in accordance with those of a message of a response to be pre-detected is identified; the duration of the signal identified is measured; this duration is compared with a minimum duration, this minimum duration being determined on the basis of the duration of the messages of the responses to be pre-detected.

Abstract: The general field of the invention is that of synthetic vision type viewing systems SVS, for a first aircraft, said system comprising at least position sensors of said aircraft, a traffic detection system calculating the position and the dangerousness of at least one second aircraft, also called intruder, presenting a risk of collision with said first aircraft based on data obtained from sensors or from systems such as the TCAS or ADS-B, an electronic computer, a human-machine interface means and a display screen, the computer comprising means of processing different information obtained from the database, from the sensors and from the interface means, said processing means arranged so as to provide the display screen with a synthetic image of the space surrounding the first aircraft and centred on the latter.

Abstract: The general field of the invention is that of viewing systems of the synthetic vision type SVS, for a first aircraft, the said system comprising at least one cartographic database of a terrain, position sensors, for the said aircraft, an air traffic detection system calculating the position and the danger rating of at least one second aircraft exhibiting a risk of collision with the said first aircraft on the basis of data originating from sensors or systems such as TCAS or ADS-B, an electronic computer, a man-machine interface means and a display screen, the computer comprising means for processing the various items of information originating from the database, sensors and interface means, the said processing means arranged so as to provide the display screen with a synthetic image of the terrain comprising a representation of the said second aircraft.

Abstract: A circuit for a display used on an aircraft causes the display to display a composite terrain image. The composite terrain image can be formed from first terrain data from a terrain database and second terrain data from a radar system. A display control circuit can generate a display signal for the composite terrain image. The display signal is received by the display. The composite terrain image can be viewed by a pilot.

Abstract: The invention relates to a method for assisting the piloting of an aircraft in the vicinity of a landing or takeoff point, by: determining the locus of entry and/or exit points for a given approach and/or departure altitude that are not safe for reaching the landing and/or takeoff point; and presenting a diagram including said locus on a display device.

Abstract: A field unit for warning of a danger of collision between an aircraft and an obstacle, in particular a topographical ground obstacle or an obstacle formed by a mast, building or aerial cable structure, comprises a multi-part tubular mast having devices for fixing a solar panel and a radar antenna; an elongate radar antenna in an environment-protective casing, which, with an electronics unit, forms a radar system for synthesized radar detection of an aircraft in a radar coverage area; a central processing unit for identifying on the basis of information from the radar system an aircraft which is in a zone of the radar coverage area and which on the basis of radar information such as direction, distance and/or speed computes a collision danger area; and a high-intensity light system and radio transmitter system that can be activated by the central processing unit upon detection of an aircraft in a collision danger area.