Abstract: In a general aspect, a monitoring system detects presence of an object in a space, e.g., when no motion is detected. Motion of an object in a space is detected by analyzing a first set of signals based on wireless signals transmitted in a first time period. Lack of motion in the space is detected by analyzing a second set of signals based on wireless signals transmitted in a second, subsequent time period. Whether the object was present in the space during the second time period is detected by analyzing the second set of signals.

Abstract: A trailer-detection system includes a radar-sensor and a controller. The radar-sensor is used to determine a range, an azimuth-angle, and an elevation-angle of a radar-signal reflected by a trailer towed by a host-vehicle. The controller is in communication with the radar-sensor. The controller is configured to determine a size of the trailer towed by the host-vehicle based on the range, the azimuth-angle, and the elevation-angle of the radar-signal.

Abstract: Method and apparatus for leakage signal cancellation in a simultaneous transmit and receive RF system includes: generating a digital transmit signal for transmission from the system; receiving a receive signal produced by reflection of the transmit signal from an object or generated by a second RF system; adaptively filtering the transmit signal by an adaptive finite input response (FIR) filter; calculating filter coefficients for the adaptive FIR filter in real-time at a different sampling rate; adaptively inputting the calculated filter coefficients to the adaptive FIR filter to generate a cancellation signal in real-time; and applying the cancellation signal to the receive signal to cancel leakage in the receive signal to generate an optimum receive signal.

Abstract: In an example method, a vehicle configured to operate in an autonomous mode could have a radar system used to aid in vehicle guidance. The method could include transmitting at least two signal pulses. The method further includes, for each transmitted signal pulse, receiving a reflection signal associated with reflection of the respective transmitted signal pulse. Each reflection signal may be received when the apparatus is in a different respective location. Additionally, the method includes processing the received reflection signals to determine target information relating to one or more targets in an environment of the vehicle. Also, the method includes correlating the target information with at least one object of a predetermined map of the environment of the vehicle to provide correlated target information. Yet further, the method includes storing the correlated target information for the at least one object in an electronic database.

Abstract: The present invention relates to an apparatus for estimating an arrival-angle of a reception signal and a beam-forming apparatus in a radio wave receiver, such as radar. More specifically, the present invention relates to an apparatus for accurately estimating an arrival-angle of a reception signal, or an apparatus for performing the beam-forming of a reception signal by using a multi-reception array antenna, by using a reference value that is obtained by calculating the degree of distortion of the magnitude and phase of a signal for each reception angle.

Abstract: To improve the problems of conventional mine detectors, the purpose of the present invention is to provide a smart wearable mine detector comprising a human body antenna unit 100, a main microprocessor unit 200, a smart eyeglasses unit 300, a body-mounted LCD monitor unit 400, a wireless data transmission and reception unit 500, a belt-type power supply unit 600, a black box-type camera unit 700, and a security communication headset 800, the smart wearable mine detector: can be detachably worn on the head, torso, arm, waist, leg and the like of a body while a combat uniform is worn, thereby having excellent compatibility with conventional combat uniforms; enables a human body antenna unit which is detachably attached to a body and detects a mine through a super high-frequency RF beam and a neutron technique to be applied so as to detect the mine by identifying metals, nonmetals, and initial explosives of the mine; enables mines buried on the ground and under the ground to be detected in all directions (360°),

Abstract: Location of a device within a monitored environment with compromised communication with ranging communication nodes. Specifically, an intermediate device previously located by communication with ranging communication nodes is provided to provide a ranging signal to a device to be located. The device to be located may in turn use a ranging signal received from communication with the previously located device and one or more ranging communication nodes to resolve a location.

Abstract: A method for characterizing a phase shifter in a device under test (DUT) using automated test equipment (ATE) is disclosed. The method comprises down converting an input signal received from the transmitter DUT to an intermediate frequency and routing the down converted input signal to a signal processor, wherein the signal processor generates I and Q signals using the input signal. The method further comprises setting an initial phase state on the phase shifter in the transmitter DUT and toggling at least one phase state bit to control the phase shifter to cycle through a plurality of phase states, wherein the changing phase states appear on the I and Q signals. Finally, the method comprises processing the I and Q signals to extract individual phase states programmed by the at least one phase state bit.

Abstract: A mm-wave antenna apparatus with beam steering function that includes: a Butler Matrix feeding network; a plurality of power combiners, each power combiner having one input and N outputs, configured to apply equal phase and power to a phase distributed output signal generated by the Butler Matrix feeding network and to generate N processed signals; and a plurality of millimeter wave switched beam planar antenna arrays having at least 1.5 GHz of bandwidth and located on a top low loss dielectric substrate, each antenna array of N elements, configured to obtain direct and narrow width beams from the N processed signals combined by each power combiner.

Abstract: A multi-input multi-output (MIMO) radar system and method of performing low-latency decoding in a MIMO radar system. The method includes transmitting a different linear frequency-modulated continuous wave (LFM-CW) transmit signal from each of N transmit elements of the MIMO radar system, each transmit signal associated with teach of the N transmit elements including a respective code, and receiving reflections associated with each of the transmit signals from each of the N transmit elements at each receive element of the MIMO radar system. Processing each symbol corresponding with each received reflection on a symbol-by-symbol basis is done to obtain a respective decoded signal prior to receiving all the received reflections associated with all the N transmit elements, wherein the processing includes using a Hadamard matrix with N columns in which each column is associated with the respective code transmitted by each of the N transmit elements.

Abstract: A radar device includes: radar transmitting circuitry which, in operation, generates Nt radar signals by modulating Nt transmission code sequences and transmits the radar signals via Nt transmission antennas, Nt being more than 1; and radar receiving circuitry which, in operation, receives reflection wave signals via Nr reception antennas and performs Doppler frequency analysis, Nr being more than 1. The radar transmitting circuitry stores a predetermined pulse sequence and Nt or more orthogonal code sequences, second half elements of the Nt or more orthogonal code sequences are arranged in an order reverse to first half elements of the Nt or more orthogonal code sequences and generates each of the Nt transmission code sequences by multiplying elements of the predetermined pulse sequence by elements of the Nt or more orthogonal code sequences different from each other.

Abstract: The present disclosure is directed to a receiver for Automatic Dependent Surveillance Broadcast (ADS-B) verification of a target aircraft including a first input for receiving flight tracking information from a target aircraft that indicates positional information of the target aircraft. The receiver further includes a second input for receiving positional and heading information indicating the location and orientation of a multi-element array antenna configured to be attached to the receiver, and a processing module that generates a measured bearing derived from angle of arrival data, and an expected bearing of the target aircraft derived from the indicated positional information of the target aircraft and the positional and heading information defining the receiver location and orientation. A comparator compares the expected bearing to the measured bearing and verifies the ADS-B flight tracking information of the target aircraft and outputs an indication of authenticity based on the verification.

Abstract: A radar system includes an independent multibeam antenna which outputs at least one reception signal in response to at least one arriving wave, and a signal processing circuit in which a learned neural network has been established. The signal processing circuit receives the at least one reception signal, inputs the at least one reception signal or a secondary signal generated from the at least one reception signal to the neural network, performs computation by using the at least one reception signal or secondary signal and learned data of the neural network, and outputs a signal indicating the number of at least one arriving wave from the neural network.

Abstract: A method for coherent stereo radar tracking includes, at a stereo radar system, transmitting a probe signal, receiving a reflected probe signal in response to reflection of the probe signal by a tracking target, calculating first and second target ranges from the reflected probe signal data, transforming the reflected probe signal data based on the first and second target ranges, and calculating a first target angle from the transformed reflected probe signal data.

Abstract: A coded aperture sensing system includes a tunable coding aperture positioned relative to one or more electromagnetic (EM) detectors and voxels to scatter EM radiation traveling from the voxels towards the EM detectors. The system also includes a controller configured to determine EM fields at each of the voxels. A method includes determining a desired aggregate coding matrix of the tunable coding aperture, determining control parameters corresponding to the desired aggregate coding matrix, applying sequentially each of the control parameters to tunable inputs of the tunable coding aperture, and determining the EM fields at each of the voxels. Determining the EM fields includes determining the EM fields at least in part as a function of EM fields detected at the EM detectors responsive to each of the controls being applied to the tunable inputs of the tunable coding aperture.

Abstract: Disclosed is method of computing a round trip delay between a pair of nodes, the method comprising transmitting at least one beacon at a known transmit time from each of the nodes; measuring the times-of-arrival of the beacons at other of the nodes; and estimating a round trip delay between the nodes from the measured times-of-arrival and the transmit times; and correcting the round trip delay for either or both of a frequency offset between the nodes and relative motion between the nodes.

Abstract: A radar hardware accelerator (HWA) includes a fast Fourier transform (FFT) engine including a pre-processing block for providing interference mitigation and/or multiplying a radar data sample stream received from ADC buffers within a split accelerator local memory that also includes output buffers by a pre-programmed complex scalar or a specified sample from an internal look-up table (LUT) to generate pre-processed samples. A windowing plus FFT block (windowed FFT block) is for multiply the pre-processed samples by a window vector and then processing by an FFT block for performing a FFT to generate Fourier transformed samples. A post-processing block is for computing a magnitude of the Fourier transformed samples and performing a data compression operation for generating post-processed radar data. The pre-processing block, windowed FFT block and post-processing block are connected in one streaming series data path.

Abstract: An information display device (100) is provided, which includes a distance setting module (20) configured to set a distance, a closest approach position estimating module (32) configured to estimate a closest approach position (Psa, Psb) of a first ship (S) and a closest approach position (Pa, Pb) of a second ship (Ea, Eb) at a time point when the first and second ships (S, Ea, Eb) approach each other the closest, based on navigational information of the ships (S, Ea, Eb), and a display controlling module (35) configured to cause a display screen to display the estimated closest approach position (Pa, Pb) of the second ship (Ea, Eb), a risk area (Aa, Ab), and current positions of the ships (S, Ea, Eb), the risk area (Aa, Ab) formed into a circle based on the set distance, centering on the estimated closest approach position (Psa, Psb) of the first ship (S).

Abstract: A two-dimensional (2-D) beam steerable phased array antenna is presented comprising a continuously electronically steerable material including a tunable material or a variable dielectric material, preferred a liquid crystal material. A compact antenna architecture including a patch antenna array, tunable phase shifters, a feed network and a bias network is proposed. Similar to the LC display, the proposed antenna is fabricated by using automated manufacturing techniques and therefore the fabrication costs are reduced considerably.

Abstract: A system and method to sense an environment based on data acquired by side looking radar. For example, a side looking radar is mounted on one or both sides of a ground-based vehicle and performs measurements from environment while the vehicle is moving. As the vehicle moves, a scan of the environment is therefore performed, wherein movement of the vehicle provides another dimension of information for the scan. In another example, the radar can further scan in the vertical plane at a fixed side looking angle to increase the field of view. A 3D map and localization can be determined from the scan.