Abstract: Systems and methods for radar systems to produce a radar image of a region of interest (ROI with targets. Sensors to transmit source signals to the ROI and to measure echoes reflected back from the targets corresponding to the transmitted source signals. A processor to calculate an estimate of a noisy and a partial Euclidean Distance Matrix (EDM) of the sensors and the targets. Decompose the noisy and the partial EDM into a low rank EDM that corresponds to locations to actual sensors and target locations, and a sparse matrix of distance errors, using a constrained optimization process. The low rank EDM is mapped into the sensors and the targets locations, to obtain estimated actual sensor locations. Implement an inverse imaging process using the estimated actual sensor locations and the received data, to produce the radar image to output to a communication channel.

Abstract: Method, systems, and computer-readable media for receiving, from an application instance operating on a client device, information that indicates a client device identifier, a wireless proximity beacon identifier, and a proximity of the identified client device to the identified wireless proximity beacon. From the received information, a determination is made whether the proximity of the identified client device to the identified wireless proximity beacon satisfies a threshold proximity. Based at least on the determination, an action is determined that the application instance operating on the identified client device is permitted to perform while the proximity of the identified client device to the identified wireless proximity beacon satisfies the threshold proximity. Information is transmitted to the identified client device that enables the application instance operating on the identified client device to perform the action.

Abstract: A method for facilitating real time tracking of an airborne asset via downlink of GPS signals that are usable for determining asset location information from the asset to a ground station may include receiving a first GPS signal and a second GPS signal at a device disposed on the airborne asset and combining the first and second GPS signals to form combined signal responsive to filtration and amplification of the first and second GPS signals. The method may further include employing an overlay analog translation to convert the combined signal into a composite signal at a different frequency than the combined signal, generating a pilot carrier frequency for association with the composite signal, and amplifying the composite signal prior to transmission via the downlink from the airborne asset to the ground station. The pilot carrier frequency and amplitude may be adjustable.

Abstract: An embodiment method includes: receiving radar data at a millimeter-wave radar sensor, the radar data being generated in response to an incident radio-frequency signal reflecting off an object located in a field of view of the millimeter-wave radar sensor; filtering the radar data to generate a first-filtered signal; determining a trajectory of motion corresponding to the first-filtered signal; and determining whether the trajectory of motion corresponds to a human signature, the human signature being associated with a respective operation of a vehicle.

Abstract: Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.

Abstract: An interferometric radar comprising an arm (2), which rotates with respect to an axis (z) of a plane (zx) orthogonal to an axis of rotation (y), a system of linear-polarization antennas (1), which is fixed to said arm (2) for describing complete revolutions along a circular path (c) about said axis (y) and is oriented in a direction of sight (a) parallel to the axis (y), motor-drive means (3) for driving the arm (2), a data-acquisition and processing unit (10) operatively connected to said antenna (1) for acquiring a succession of images detected by the antenna during its revolution about the axis (y) and making differential interferometric calculations for measuring at least one component of the displacement of one or more targets in the field of view, or else for measuring the digital elevation map (DEM) of the scenario in the field of view.

Abstract: There is provided a radar sensor and method. The radar sensor comprises a plurality of transmit and receive antennas, a transceiver, a digital signal processor, a filter and an interface. The transceiver is configured to digitize received radar signals to provide a plurality of digital samples. The digital signal processor is configured to form a measurement matrix by transforming the plurality of digital samples into a distance/relative velocity matrix for each combination of the transmit and receive antennas. The filter is configured to identify samples forming the measurement matrix having a signal to noise ratio higher than a threshold value. The interface is configured to transmit the identified samples and their location in the measurement matrix to a remote host processor configured to further carry out direction of arrival processing on the identified samples.

Abstract: A polarimetric phase array radar system (PPARS) for determination of parameters of a target and a method of operating the PPARS are described. The PPARS includes an array having transceiver elements configured to transmit transmitting signal components of a dual-polarization signal having either a single type polarization or simultaneously two types of polarization. The array also configured to receive a receiving signal component having a single type of polarization. In transmitting mode, the transceiver elements are operative to transmit a signal component having one or two types of polarization. In receiving mode, the transceiver elements are divided into at least two sub-arrays.

Abstract: A measuring system for determining a directional characteristic of a first signal is provided. The device under test comprises sensor means for determining its position and/or orientation. The measuring system comprises positioning means for positioning and/or orienting the device under test, and a measuring device. The position and/or orientation are transmitted by the device under test to the measuring device. The measuring device comprises antenna means for receiving or sending the first signal and processing means for processing the position and/or orientation information. The processing means determine the directional characteristic at least from the position and/or orientation.

Abstract: A measuring device serves the purpose of testing a location tracking of a device under test. The measuring device comprises a global navigation satellite system simulator adapted to wirelessly transmit a radio frequency global navigation satellite system signal to a device under test, and a base station simulator adapted to wirelessly transmit a real-time kinematic signal to the device under test. The measuring device is adapted to compare a location, determined by the device under test based on the radio frequency global navigation satellite system signal and the real-time kinematic signal, with an ideal location, upon which the radio frequency global navigation satellite system signal and the real-time kinematic signal are based.

Abstract: Disclosed is a calibration method of performing dual radiometric compensation by using an antenna gain pattern of a synthetic aperture radar (SAR) both in a time domain and in a frequency domain. The method may include performing frequency-domain radiometric compensation in relation to an elevation angle and performing time-domain radiometric compensation in relation to a frequency to calibrate the antenna gain pattern.

Abstract: Systems and methods for providing a MIMO capable antenna with unique properties are provided herein. In some embodiments, a 4×4 MIMO capable antenna is provided with unique properties. Circular polarization from the antennas ensures that both vertical and horizontal polarizations are energized to the full extent provided by local regulations. A system includes a radio and a plurality of antennas coupled to the radio, the plurality of antennas servicing a broadcast area that has a 360 degree coverage area. Each of the plurality of antennas transmits and receives in an isolated sub-sector of the 360 degree coverage area.

Abstract: Method and MIMO radar apparatus using correlated motion decomposed from reflectance data of multiple time frames to enhance discriminatory capacity in imaging. Such imaging has application in tracking temporal patterns of respiratory and cardiac activities in addition to recognition of targets within non-stationary environments.

Abstract: An automotive detection system includes a first sensor which transmits first transmitted signals into a region and receives first reflected signals and generates first receive signals. A second sensor transmits second transmitted signals into the region and receives second reflected signals and generates second receive signals. A processor: receives first portions of the first and second receive signals and processes the first portions to generate a relative misalignment angle related to misalignment of the first and second sensors relative to each other; receives a second portion of the first receive signals; uses the received second portion of the first receive signals to determining an absolute misalignment angle of the first sensor independent of an absolute misalignment angle of the second sensor; and uses the relative misalignment angle and the absolute misalignment angle of the first sensor to generate the absolute misalignment angle of the second sensor.

Abstract: Systems and method are provided for calibrating a radar system of an autonomous vehicle. In one embodiment, a method includes: obtaining, by a processor, a training set of data from at least one radar system; processing, by a processor, the training set with a machine learning method to obtain centroids of interdependent clusters within the training set; and calibrating, by a processor, the radar system based on the centroids.

Abstract: A method for automatic target recognition in synthetic aperture radar (SAR) data, comprising: capturing a real SAR image of a potential target at a real aspect angle and a real grazing angle; generating a synthetic SAR image of the potential target by inputting, from a potential target database, at least one three-dimensional potential target model at the real aspect angle and the real grazing angle into a SAR regression renderer; and, classifying the potential target with a target label by comparing at least a portion of the synthetic SAR image with a corresponding portion of the real SAR image using a processor.

Abstract: A radar apparatus includes: a radar transmitter transmitting a radar signal; and a radar receiver receiving a reflection wave signal being a reflection of the radar signal on a target. The radar transmitter includes: a radar transmission signal generator that generates the radar signal composed of a transmission code with each sub-pulse given a predetermined phase shift; and a transmission radio unit that transmits the radar signal generated by the radar transmission signal generator in a predetermined transmission cycle. In radar signals transmitted by the transmission radio unit in a predetermined number of transmission cycles, code imbalances of transmission codes are included in all of four quadrants of the IQ plane. Each of the code imbalances is an imbalance between the positions where a plurality of sub-pulses constituting a transmission code included in a radar signal transmitted in each of the transmission cycles are mapped on the IQ plane.

Abstract: A method of estimating position of an obstacle of a plurality of obstacles with a radar apparatus. An azimuth frequency, an elevation frequency and a range of the obstacle are estimated to generate an estimated azimuth frequency, an estimated elevation frequency and an estimated range of the obstacle. A metric is estimated from one or more of the estimated azimuth frequency, the estimated elevation frequency and the estimated range of the obstacle. The metric is compared to a threshold to detect an error in at least one of the estimated azimuth frequency and the estimated elevation frequency. On error detection, a sign of at least one of the estimated azimuth frequency and the estimated elevation frequency is inverted to generate a true estimated azimuth frequency and a true estimated elevation frequency respectively.

Abstract: An aircraft ice detection system is configured to determine a condition of a cloud and includes a radar system, a lidar system, optics and a dichroic filter. The radar system is configured to project quasi-optical radiation to the cloud and receive reflected quasi-optical radiation from the cloud. The lidar system is configured to project optical radiation to the cloud and receive reflected optical radiation from the cloud. The optics are configured to direct the quasi-optical radiation and the optical radiation to the cloud and receive the reflected quasi-optical radiation and the reflected optical radiation from the cloud. The dichroic filter is configured to direct the quasi-optical radiation from the radar system to the optics, direct the optical radiation from the lidar system to the optics, direct the reflected quasi-optical radiation from the optics to the radar system and direct the reflected optical radiation from the optics to the lidar system.

Abstract: An integrated circuit (IC) is provided with a plurality of diode based mm-wave peak voltage detectors (PVD)s. During a testing phase, a multi-point low frequency calibration test is performed on one or more of the PVDs to determine and store a set of alternating current (AC) coefficients. During operation of the IC, a current-voltage sweep is performed on a selected one of the PVDs to determine a process and temperature direct current (DC) coefficient. A peak voltage produced by the PVD in response to a high frequency radio frequency (RF) signal is measured to produce a first measured voltage. An approximate power of the RF signal is calculated by adjusting the first measured voltage using the DC coefficient and the AC coefficient.