Abstract: Described is a stripmap SAR system on a vehicle comprising an antenna that is fixed and directed outward from the side of the vehicle, a SAR sensor, a storage, and a computing device. The computing device comprises a memory, one or more processing units, and a machine-readable medium on the memory. The machine-readable medium stores instructions that, when executed by the one or more processing units, cause the stripmap SAR system to perform various operations. The operations comprise: receiving stripmap range profile data associated with observed views of a scene; transforming the received stripmap range profile data into partial circular range profile data; comparing the partial circular range profile data to a template range profile data of the scene; and estimating registration parameters associated with the partial circular range profile data relative to the template range profile data to determine a deviation from the template range profile data.

Abstract: A method and system for determining a position of a non-cooperative object using a reflected signal from Secondary Surveillance Radar (SSR) system is disclosed. The method enables the ownship to detect a non-cooperative intruder, an aircraft which does not have a functioning transponder. The position and altitude of the non-cooperative intruder are determined from reflected signals by a phased array antenna or mechanically scanned directional antenna (MSDA) to perform tracking and avoidance of the non-cooperative object. In the case that a phased array antenna or MSDA is not available, a co-altitude assumption is applied to conservatively determine an avoidance area around the non-cooperative object, which defines coordinates to be tracked and avoided by the ownship.

Abstract: A coupling device includes a plurality of couplers. Each coupler includes a transmission main line and a coupling subline. The transmission main line is used for providing an input end and an output end. The coupling subline is coupled with the transmission main line to provide two coupling ends. The coupling subline includes two first parts located on opposite sides of the transmission main line and a second part connected between the two first parts. The coupling sublines of the plurality of couplers are connected in series to provide a first coupling output port and a second coupling output port. The first part of the coupling subline of at least one of the plurality of couplers has a shared section with the second part of the coupling subline of an adjacent one of the plurality of couplers.

Abstract: A monopulse secondary surveillance radar is configured to integrate replies to active interrogations and passive squitter reception into a single surveillance system, and includes: a three-channel antenna arrangement; a redundant ADS-B antenna arrangement including a first and second omnidirectional ADS-B antenna, each having a low noise amplifier, and each being integrated with a GPS antenna; and a pair of redundant four-channel interrogators. The three-channel antenna arrangement is configured to transmit interrogations, and to receive corresponding replies from an aircraft transponder. The first ADS-B antenna is coupled to a first of the pair of redundant four-channel interrogators, and the second ADS-B antenna is coupled to a second of said pair of redundant four-channel interrogators, for the monopulse secondary surveillance radar to provide real-time passive detection of ADS-B-equipped aircraft and active radar detection of aircraft to each of the pair of redundant four-channel interrogators.

Abstract: A ground control point device includes an SAR wave reflector configured to receive an SAR wave incident from an SAR in an incident direction and to reflect the SAR wave in the incident direction; a GNSS receiver configured to receive a GNSS wave to generate, based on the GNSS wave, time information and positional information indicative of a position of a control point; an SAR wave receiver configured to receive the SAR wave; and a control point data generator/transmitter configured to generate control point data obtained by associating the positional information when the SAR receiver receives the SAR wave with a time instant of reception of the SAR wave that is determined based on the time information, and to transmit the control point data to outside.

Abstract: Devices, systems, and methods for multi-band radar sensing are disclosed. In an embodiment, an integrated circuit device includes transmit components and receive components, a low-band transmit interface connected to output a first signal at a low-band frequency, a high-band transmit interface connected to output a second signal at a high-band frequency, a low-band receive interface connected to receive a third signal at the low-band frequency, a high-band receive interface connected to receive a fourth signal at the high-band frequency, and mixers connected to upconvert the first signal at the low-band frequency to the second signal at the high-band frequency for transmission from the high-band transmit interface and to downconvert the fourth signal at the high-band frequency received at the high-band receive interface to a fifth signal at the low-band frequency, wherein the upconversion and the downconversion are implemented using a conversion signal at a conversion frequency.

Abstract: A system for augmenting 360-degree aspect monostatic radar cross section of an aircraft. The system may comprise a pair of pods mountable on opposing wing tips of an aircraft and each having a pod housing with an elongate body tapering forwardly to a nose and rearwardly to a tail. Each pod may comprise a forward SDL disposed within the nose, a rear SDL disposed within the tail, and a pair of mid-body SDLs disposed within a mid-section of the pod housing. The SDLs may be arranged within the pods to reflect radiation and provide coverage around the aircraft over a region of about 360 azimuth degrees. Each SDL may comprise radar absorbing material located on an interior reflective surface, and portions of the elongate bodies may be constructed of radome material. The SDLs may be Luneburg lens having diameters of at least approximately 8-inches.

Abstract: The method carries out a measurement of the distance from the ground of an aircraft by undertaking the emission of waveforms making it possible to obtain, after demodulation, of the signals received in return and sampling of the demodulated signals at a frequency Féch, two signals E*0(t) and E*1(t), taking the form of two frequency ramps, of respective slopes K0 and K1, of respective passbands B0 and B1 and of respective durations TE0 and TE1, the N-point FFT spectral analysis of which is carried out. The values of the durations TE0 and TE1 as well as those of the passbands B0 and B1, are defined in such a way as to be able to determine, on the basis of the spectra of the signals E*0(t) and E*1(t), a measurement of non-ambiguous distance d1 covering the maximum distance dmax to be instrumented and an ambiguous distance d0 exhibiting the desired distance resolution. The distance d to be measured being determined by combining these two measurements.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for multistatic radar communications. In one aspect, a wireless communication device may determine a distance and direction of one or more receiving devices. The wireless communication device may transmit, to the one or more receiving devices, timing information indicating a timing relationship between a codeword sequence and one or more pulses. The wireless communication device may transmit a respective codeword of the codeword sequence in the direction of each of the one or more receiving devices. The wireless communication device may further transmit the one or more pulses in a plurality of directions. The wireless communication device may receive feedback from at least one of the one or more receiving devices and determine ranging information about an object based on the feedback and the distance or direction of at least one receiving device.

Abstract: An object detection apparatus 1 includes: an emitting unit 101 for emitting an RF transmission signal; a receiving unit 201 for receiving, if the RF transmission signal is reflected off an object, the reflected RF transmission signal as an RF reception signal; an IF signal generating unit 202 for generating, in every period, a complex IF signal based on a signal obtained by mixing the RF transmission signal with the RF reception signal; a position detecting unit 203 for detecting the position of the object based on an evaluation function generated based on the complex IF signal generated in every period; and a displacement detecting unit 204 for detecting a displacement of the object based on the position of the object and the phase of complex reflectance of the object calculated based on the complex IF signal.

Abstract: A device for checking the consistency of a positioning includes: a transmitter, a receiver, a time measuring unit, a distance determining module and a check module. The transmitter emits at least one signal, and the receiver receives at least four response signals from at least four different response elements. A response element receives the at least one signal and, upon receipt, emits a response signal. The time measuring unit determines, for each response signal, a total delay time from a transmission time of the signal and a reception time of the respective signal. The distance determination module determines a distance to the respective response element based on each total delay time, and the check module performs a consistency check of a determination of a position based on distances to the different response elements. With the device, erroneous distance values may be detected in ground-based positioning systems.

Abstract: A radar fill level measurement device for determining a fill level of a medium is provided, including a transmitter configured to transmit a transmission signal towards the medium; a receiver configured to receive a reception signal reflected by the medium; and a controller configured to determine the fill level of the medium based on the reception signal and based on at least one evaluation parameter, the radar fill level measurement device being configured to vary a transmitting power of the transmission signal, the controller being further configured to determine a current transmitting power of the transmission signal, and the controller being further configured to vary, based on the determined current transmitting power, a value of the at least one evaluation parameter and/or at least one measurement signal that correlates with the reception signal, such that the fill level is determined taking into account the transmitting power.

Abstract: A radar apparatus and an automobile including the radar apparatus are provided. The radar apparatus may measure the elevation/declination angle of a target with high accuracy by using simple circuits at low cost without use of a detection circuit and an AD conversion circuit having high time resolution. A transmit antenna transmits transmit signal waves modulated through the multilevel FSK, and receive antennas receive reflected waves obtained by reflecting, off a target, the transmit signal waves which return. The multilevel FSK is used as a modulation method so that the beat frequency between the receive signal waves from the target and the transmit signal waves serves as the Doppler frequency. Thus, the elevation/declination angle ? of the target is calculated by a computing unit, not from the frequencies of the receive signal waves as in the related art, but from the frequency of the transmit signal waves.

Abstract: A millimeter-wave three-dimensional holographic imaging method and system. The method comprises: transmitting a continuous frequency wave to a measured human body, and receiving an echo signal reflected back; performing Fourier transform, phase compensation, inverse Fourier transform, and “non-uniform sampling to uniform sampling” interpolation; and projecting three-dimensional echo data to obtain two-dimensional reconstruction data, and generating a two-dimensional reconstructed image.

Abstract: An emergency position indicating radio beacon that includes a waterproof rigid housing, antenna, a retention carriage strap securely mounted around its exterior periphery on a spool in a storage position. In an emergency the user can unwind the retention carriage strap and form an adjustable loop in the strap using hook and loop fasteners to firmly attach the strap connected to the EPIRB housing to the user's arm that allows a user to transport the radio beacon with the retention carriage strap in a hands-free configuration.

Abstract: In a position estimation processing unit, by using the reflected wave signal of an array composed of receiving antennas arranged in a first direction among a plurality of receiving antennas, a maximum likelihood value extraction unit extracts the angle of arrival of a reflected wave signal in a first direction. An angle spread detection unit detects the angle spread in the first direction around the angle of arrival by using the reflected wave signal of the array. A target height estimation unit estimates the position of the target in the first direction by using the angle of arrival and the angle spread.

Abstract: Embodiments include a system and a method for determining a geographic location corresponding to pixels in a scan. For a scan of an area including a plurality of pixels, measurements of at least one physical property may be received. An embodiment may include identifying in the scan at least a first pixel and a second pixel corresponding to known at least a first and a second geographical locations; creating a set of pixel values vectors, for each pixel values vector calculating a correlation factor between the pixel values vector and a vector that includes the measurements; selecting a pixel values vector, from the set of pixel values vectors, for which a correlation factor higher than a threshold value was calculated; and determining the actual geographic location of the area represented by each pixel in the selected pixel values vector based on the known geographic locations.

Abstract: Various communication systems may benefit from suitable architectures. For example, L-band radio frequency (RF) architectures may be beneficial to systems including avionics systems. A system can include a mode-s function as well as a traffic alert and collision avoidance system function separate from the mode-s function. The system can further include a directional antenna in reception and transmission connection with the traffic alert and collision avoidance system function. The system can additionally include an omni-directional antenna in reception and transmission connection with the mode-s function.

Abstract: An embodiment of an antenna array includes a transmit antenna and a receive antenna. The transmit antenna has, in one dimension, a first size, and has, in another dimension that is approximately orthogonal to the one dimension, a second size that is greater than the first size. And the receive antenna has, in approximately the one dimension, a third size that is greater than the first size, and has, in approximately the other dimension, a fourth size that is less than the second size. For example, such an antenna array, and a radar system that incorporates the antenna array, can provide a high Rayleigh resolution (i.e., a narrow Half Power Beam Width (HPBW)) with significantly reduced aliasing as compared to prior antenna arrays and radar systems for a given number of antenna-array channels.

Abstract: A transmission antenna unit includes a plurality of transmission antennas, a reception antenna unit, and a processor. The plurality of transmission antennas that are arranged in a row along a predetermined array direction. The reception antenna unit includes a plurality of reception antennas that are arranged in a row along the array direction. The plurality of transmission antennas and the plurality of reception antennas form a virtual array in which a plurality of virtual reception antennas are arranged in a row along the array direction. The processor corrects a plurality of virtual reception signals by multiplying a virtual reception signal matrix by an inverse matrix of a reception mutual coupling matrix and an inverse matrix of a transmission mutual coupling matrix.