A system and method for detecting a rotary wing aircraft. A return electromagnetic signal, reflected by a rotary wing aircraft, is received through an electromagnetic signal detection apparatus. The aircraft includes a plurality of propeller blades attached to at least one motor. At least one propeller blade has at least one portion with a reflectivity different from other portions. A first time series data of the return electromagnetic signal is received. A second time series data is determined based on the first time series data and a predefined threshold. A characteristic of the second time series data is used to determine whether it corresponds to the known aircraft.

A system and method for detecting a rotary wing aircraft. A return electromagnetic signal, reflected by a rotary wing aircraft, is received through an electromagnetic signal detection apparatus. The aircraft includes a plurality of propeller blades attached to at least one motor. At least one propeller blade has at least one portion with a reflectivity different from other portions. A first time series data of the return electromagnetic signal is received. A second time series data is determined based on the first time series data and a predefined threshold. A characteristic of the second time series data is used to determine whether it corresponds to the known aircraft.

Methods and structures are disclosed for using a graphics processing unit (GPU) to detect and organize pulses in an efficient, parallel manner. A received signal is divided into a plurality of sub-batches. Each of the plurality of sub-batches is processed in parallel by detecting a number of pulses present within each of the plurality of sub-batches. A scanning algorithm process for combining the pulse information of the detected pulses includes providing pulse information from detected pulses within a plurality of subgroups with each subgroup including 2.sup.n sub-batches, with n equal to a number of iterations of performing the providing, and repeating the iterations, increasing n by 1 for each iteration, until 2.sup.n is equal to the total number of sub-batches in the plurality of sub-batches. An output array is generated having a size based on a total combined pulse count and including sequential pulses from the plurality of sub-batches.

A first electronic device, second electronic device, and a method are disclosed herein. The first electronic device includes communication circuitry and a processor that implements the method, including transmitting, using the communication circuit, a distance measurement signal including the first secure preamble to the second electronic device, receiving a response signal through the communication circuit including a second secure preamble generated by the second electronic device from the external electronic device, authenticating the response signal based on the second secure preamble, and based on successful authentication, determining a distance to the second electronic device based on a transmission time of the distance measurement signal and a reception time of the response signal.

Various avionics systems may benefit from appropriate integration of distance measurement equipment, traffic collision avoidance systems, and transponders, with the distance measurement equipment using a dedicated antenna. A system can include a transponder processor. The system can also include a top antenna receiver configured to connect to a top antenna. The transponder processor can be configured to communicate using the top antenna. The system can also include a bottom antenna receiver configured to connect to a first bottom antenna, wherein the transponder processor is configured to communicate using the first bottom antenna. The system can further include a distance measure equipment processor integrated with the transponder processor and configured to measure distance using a second bottom antenna.

A method for detecting conflicts in the II/SI identification code of radars nearby a secondary mode-S radar, includes at least: a first step wherein the radar detects unsolicited unsynchronized replies, i.e. fruits, in a region of extended radar coverage; a second step wherein the radar detects a conflict in II/SI code by analyzing geographic regions of radar coverage common to the radar and to at least one nearby radar, a conflict being detected if the radar: detects, in the region of extended coverage, the presence of fruits that have as source the nearby radar; observes the absence of fruits caused by the nearby radar in that region of radar coverage of the radar which does not overlap with the region of radar coverage of the nearby radar; the region of overlap between the radar coverage of the radar and the radar coverage of the nearby radar forming a region of conflict in II/SI code.

A density of Mode S interrogations and responses in the environment covered by a secondary radar is characterized according to the following steps: a first step wherein the radar: detects and locates Mode S targets by way of their synchronous responses to the interrogations emitted by the radar; detects asynchronous responses emitted by the Mode S targets, and not elicited by the radar; for each target, associates its asynchronous responses with its synchronous response to the radar; a second step wherein the radar: based on the association, determines the response rate of each target by counting the number of synchronous and asynchronous responses received from the target per given time period; with the environment being divided into elementary space cells, determines the response rate per cell by counting the number of synchronous and asynchronous responses received by each target in each cell, the rate characterizing the density of Mode S interrogations per cell.

Computer assistance in interval management may be beneficial in a number of ways. For example, digital communication of interval management instructions or information related to interval management may beneficially be communicated to aircraft with respect to other aircraft. This information may be communicated overlaid on air traffic control (ATC) communications, or otherwise. A method can include, for example, obtaining a spacing goal for an aircraft relative to a target aircraft. The method can also include determining clearance instructions for the aircraft, wherein the speed guidance is based on the spacing goal. The method can further include transmitting the clearance instructions in a computer-readable format to the aircraft. The instructions can be provided by an overlay-modulated signal of a provided modulated ATC signal. The instructions can be configured to enable control of the aircraft to achieve the spacing goal.

An access control device of a vehicle is configured to detect the spatial position of the access element of the vehicle safety unit relative to the vehicle via electromagnetically detecting the distances and angles between several low-frequency transmitting antennas of the vehicle safety unit and the low-frequency receiver of the access element. The access control device is also configured to detect the location position of an external induction charging unit relative to the vehicle via electromagnetically measuring the distance and angle between at least two transmitting antennas of several low-frequency transmitting antennas and at least one receiving antenna of the induction charging unit.

There are provided methods and systems for producing a wave-beam having substantially constant lateral extent over a desired range of distances, and interrogation and response system and methods utilizing the same. The method for producing a wave-beam having substantially constant lateral extent includes generating a plurality of at least partially incoherent constituent wave-beams having different divergences and directing the plurality constituent wave-beams to propagate along substantially parallel propagation axes such that the constituent wave-beams at least partially overlap and superpose to form a combined wave-beam. The divergences and intensities of the constituent wave-beams are selected such that the combined wave-beam has a desired substantially constant extent over a desired range of distances along said propagation axes.