Abstract: An antenna array apparatus includes: first antenna elements arranged to form a first radiation pattern with a recessed portion at the center of the first radiation pattern; and second antenna elements arranged to form a second radiation pattern with a convex portion at the center of the second radiation pattern.

Abstract: A method is described for determining the position of a vehicle equipped with a radar system that includes at least one radar sensor adapted to receive radar signals emitted from at least one radar emitter of the radar system and reflected the radar sensor. The method comprises: acquiring at least one radar scan comprising a plurality of radar detection points, wherein each radar detection point is evaluated from a radar signal received at the radar sensor and representing a location in the vicinity of the vehicle; determining, from a database, a predefined map, wherein the map comprises at least one element representing a static landmark in the vicinity of the vehicle; matching at least a subset of the plurality of radar detection points of the at least one scan and the at least one element of the map; deter-mining the position of the vehicle based on the matching.

Abstract: A millimeter-wave real-time imaging based safety inspection system and safety inspection method. The safety inspection system includes a conveying device (10), a millimeter wave transceiver module (11), an antenna array (17, 18), a switch array (16a, 16b), a switch control unit (15a, 15b), a quadrature demodulation and data acquisition module (12), and an image display unit (13). By using an Inverse Synthetic Aperture Radar (ISAR) imaging principle, the millimeter-wave real-time imaging based safety inspection system performs real-time imaging on an object to be inspected when the object moves, so that not only the imaging speed is improved, but also the field of view is enlarged. A safety inspector can determine whether an inspected person carries dangerous goods by observing a three-dimensional diagram of the inspected person, thereby eliminating the inconvenience caused by back-and-forth movement of a safety inspection device used by the safety inspector around the inspected person.

Abstract: A radar apparatus includes a plurality of transmission antennae and a radar transmitter that transmits transmission signals by using the plurality of transmission antennae. In a virtual reception array including a plurality of virtual antennae formed of a plurality of reception antennae and the plurality of transmission antennae, disposition positions of at least two of the virtual antennae are the same as each other, and, transmission intervals of the transmission signals that are sequentially transmitted from transmission antennae corresponding to the at least two virtual antennae among the plurality of transmission antennae are an equal interval.

Abstract: A system is provided comprising: a plurality of receivers; a plurality of antennas; a calibration device coupled to the plurality of receivers; a plurality of antenna paths, each of the antenna paths being arranged to couple a respective one of the plurality of receivers with a respective one of the plurality of antennas; a plurality of first calibration paths, each of the first calibration paths being arranged to couple the calibration device to different respective first pair of the antenna paths; a plurality of second calibration paths, each of the second calibration paths being arranged to couple the calibration device to a different respective second pair of the antenna paths, each second pair of the antenna paths including at least one antenna path in common with any of the first pairs of the antenna paths.

Abstract: A global positioning system (GPS) registration tool (GRT) is provided that is configured to register GPS coordinates of a streetlight controller (SLC) during installation of the SLC at a light fixture and store the GPS coordinates of the SLC at the SLC. Related systems, methods and computer program products are also provided.

Abstract: Embodiments of an access point (AP), station (STA) and method of communication are generally described herein. In a null data packet (NDP) based ranging procedure between a responding STA and an initiating STA that is unassociated with the responding STA, the responding STA may: transmit a broadcast frame that indicates one or more ranging parameters; receive, from the initiating STA, an NDP announcement (NDPA) frame that indicates transmission of a first NDP from the initiating STA; detect the first NDP from the initiating STA; transmit a second NDP for transmission to the initiating STA; and transmit, to the initiating STA, a location measurement report (LMR) that indicates: a reception time of the first NDP at the responding STA, and a transmission time of the second NDP at the responding STA.

Abstract: A method for optimizing the elevational pointing of an antenna of an airborne radar system at an altitude h includes an antenna and processing and calculation means, the method comprising: a. selecting an area of interest b. calculating atmospheric losses Lref at a reference altitude href at the reference range Dref and calculating a reference criterion Kref=?40 log10 (Dref); c. for each possible elevational pointing distance of the antenna Dpt from the area of interest, calculating the antenna elevation S that makes it possible to target the distance Dpt via the centre of the antenna; d. for each distance D from the region of interest, calculating the angle ? at which the antenna observes the point of the ground at the distance D and calculating a criterion; 1. K(D)=Ge(?)+Gr(?)?40 log10 D+Lref(href,Dref)?Latmo(h,D) 2. where Ge(?),Gr(?) are respectively the gains of the antenna that are normalized at emission and at reception; e.

Abstract: Systems and methods for providing wide field-of-view radar arrays. Quadrature phase-shift keying (QPSK) beam forming reduces side lobes by applying a phase shift to transmitted signals to selected transmitting antennas. Super-hemispherical radar coverage at high gain in both broadside and end-fire directions is provided by beam directing elements mounted to a printed circuit board.

Abstract: This radar device can recognize the type of a specific target (in particular, a two-wheeled vehicle) with high precision, using only the radar device. The radar device comprises: a transmission unit that transmits a transmission wave, based on a transmission signal, toward the target; a receiving unit that receives a reflected wave generated by the transmission wave being reflected by the target, and thereby generates a reception signal; and a target detection unit that acquires information on the target on the basis of the transmission signal and the reception signal. The target detection unit calculates the relative speeds of a plurality of detection points within the same target, and determines the type of the target on the basis of the spread of the relative speeds.

Abstract: A vehicular radar sensing system includes a radar sensor disposed at a vehicle so as to sense exterior of the vehicle and having at least one transmitter that transmits radio signals and at least one receiver that receive radio signals. The radar sensor includes at least one wave guide antenna, a PCB, and a processor disposed on an inboard side of the PCB and operable to process radio signals received by the at least one receiver. The wave guide antenna includes a first wave guide slot disposed at the inboard side of the PCB that guides the radio signals to the at least one receiver or from the at least one transmitter, a second wave guide slot that guides the radio signals to and from the environment, and an air wave guide that guides the radio signals between the first wave guide slot and the second wave guide slot.

Abstract: Disclosed is a sensor device. The sensor device includes a sensor configured to be attached between a rear wheel of a vehicle and a rear body cover of the vehicle, configured to detect objects in proximity to the vehicle through the rear body cover. The sensor device also includes a vertical guard configured to be attached to the vehicle, such that the sensor is protected from adhesion of materials directed rearward by the rear wheel, and an angled guard coupled to the vertical guard and extending underneath the sensor and towards the rear body cover, such that a portion of the rear body cover, through which the sensor emits a signal for detecting objects in proximity to the vehicle, is protected from adhesion of materials directed rearward by the rear wheel.

Abstract: Described is a system for transferring learned knowledge from an electro-optical (EO) domain to a synthetic-aperture-radar (SAR) domain. The system uses a measured similarity between the EO domain and the SAR domain to train a model for classifying SAR images using knowledge previously learned from the electro-optical (EO) domain. Using the trained model, a SAR image is processed to determine regions of interest in the SAR image. A region of interest is classified to determine whether the region of interest corresponds to an object of interest, and classified regions of interest that contain the object of interest are output. The object of interest is displayed on a visualization map, and the visualization map is automatically updated to reflect a change in position of the object of interest.

Abstract: A time synchronization system an input interface configured to receive pseudorange measurements from a set of antennas of at least one Global Navigation Satellite System (GNSS) receiving system that operates the antennas at known positions according to a clock with an unknown time bias to receive signals from satellites in sight of the antennas and an output interface configured to output the determined time bias. The time synchronization system also includes a processor configured to compare the pseudorange measurements of different antennas to produce an antenna-specific clock offset for each of the antennas, correct the pseudorange measurements of the antennas according to the antenna-specific clock offsets of corresponding antennas to produce corrected pseudorange measurements, and determine the time bias of the clock using the corrected pseudorange measurements.

Abstract: The invention provides a millimeter wave radar modeling-based method for object visibility determination, to solve the problem of object visibility determination based on virtual sensor modeling in intelligent vehicle simulation and testing, and improve the fidelity of sensor modeling while meeting simulation efficiency requirements. It includes the steps of target vehicle information detection to obtain target vehicle information; target vehicle reflection intensity simulation: for each target vehicle performing geometry culling on the target vehicle, discarding completely-invisible target vehicles, and calculating visible section information for each target vehicle that has a visible section, and reflection intensity calculation; target vehicle visibility determination: analyzing visibility of the target vehicle according to the target vehicle reflection intensity, and converting and outputting information of a visible object into an expression form of a real millimeter-wave radar sensing an object.

Abstract: The example non-limiting technology herein provides a Synthetic Aperture Radar (SAR) solution on board a micro-satellite that provides global revisit within 1 month; a cost below US$ 10 million; and satellite mass lower than 100 kg. One solution uses an inflatable Cassegrain type antenna with a phased beam steering array in the 1.2 GHz band.

Abstract: The present disclosure relates to a transmission apparatus, including at least one first RF signal connection for an RF signal having a first phase, a ring coupler having a plurality of antenna connections for coupling a plurality of antennas in the first RF signal connection, wherein the ring coupler is configured to cause, at each of different antenna connections of the ring coupler, a constructive superposition of components of the RF signal that propagate from the first RF signal connection to the respective antenna connections in different directions in the ring coupler, wherein RF signals having different phases are obtained at the different antenna connections.

Abstract: Systems and methods to perform object surface estimation using a radar system involve receiving reflected signals resulting from reflection of transmit signals by an object. The method includes processing the reflected signals to obtain an image. The image indicates an intensity associated with at least one set of angle values and a set of range values. The method also includes processing the image to provide the object surface estimation. The object surface estimation indicates a subset of the at least one set of angle values and associated ranges within the set of range values.

Abstract: Disclosed are a method and apparatus for SAR image data enhancement, and a storage medium. The method includes: processing an SAR target image by electromagnetic simulation to acquire an SAR electromagnetic simulation image; and processing the SAR electromagnetic simulation image and the SAR target image by a generative adversarial network to obtain a set of virtual samples of the SAR target image.

Abstract: An ultra-wideband radar transceiver and an operating method thereof are provided. The ultra-wideband radar transceiver includes a receiving module. The receiving module includes an I/Q signal generator, a first sensing circuit and a second sensing circuit. The I/Q signal generator receives M consecutive echo signals and generates M consecutive in-phase signals and M consecutive quadrature-phase signals accordingly, wherein M is an integer greater than 1. The first sensing circuit is coupled to the I/Q signal generator to receive the M consecutive in-phase signals and is configured to perform integration and analog-to-digital conversion on the M consecutive in-phase signals to generate a first digital data. The second sensing circuit is coupled to the I/Q signal generator to receive the M consecutive quadrature-phase signals and is configured to perform integration and analog-to-digital conversion on the M consecutive quadrature-phase signals to generate a second digital data.