Abstract: A test device for testing a detection device includes a reflection element with reflective surface where the reflective surface is a radar reflective surface and/or an ultrasound reflective surface. The reflection element is movable by a drive device periodically back and forth in a translational movement along a movement axis with respect to a housing of the test device. A movement of the reflection element produces a relative speed unequal to zero of the test device with respect to the detection device.

Abstract: A device for controlling the efficiency of a scanning active antenna includes at least two transmission paths Txi, a transmission path comprising a phase control module, and a power stage at the output of which a radiating element is arranged, comprising at least: a voltage modulator located upstream of the power stage of each of the radiating elements, a control device transmitting a PWM drain voltage control signal configured so as to manage the gain of a power stage in accordance with a predefined first bias law and to control the phase applied to the drain of the power stage in accordance with a second bias law.

Abstract: An automotive radar arrangement includes a radar receiver configured to generate radar reception data from radio signals received by a plurality of radar receive antennas. A radar signal processor is configured to determine an estimate of an angular position of at least one object by processing the radar reception data. A communication interface is configured to receive information about a reference angular position of the at least one object. A determiner is configured to determine a compensation for the radar reception data based on the estimate of the angular position and the reference angular position of the at least one object. The radar signal processor is configured to correct the radar reception data and/or further radar reception data for the detection of a further object based on the compensation. An output interface is configured to provide information about the presence of the further object to a vehicle controller.

Abstract: A communication apparatus includes an antenna array having a plurality of antenna elements, a plurality of thermoelectric devices that are arranged on the plurality of antenna elements of the antenna array, and a processor that determines which subset of the antenna elements are in an activated state and which are in a deactivated state, and further executes an activation or a deactivation of each of the plurality of thermoelectric devices in synchronization with the activated state or the deactivated state of different subsets of antenna elements of the plurality of antenna elements. Further, the processor controls each of the first plurality of thermoelectric devices to apply adaptive cooling on a first subset of antenna elements to maintain a corresponding temperature in a first specified range and apply adaptive cooling on a second subset of antenna elements to maintain a corresponding temperature in a second specified range.

Abstract: A measurement method for a device includes, for each antenna group other than a target antenna group in an antenna array, determining compensation values of the antenna group based on characteristic parameters of the antenna group and characteristic parameters of the target antenna group, and adjusting, based on the compensation values of the antenna group, an electromagnetic wave transmitted by each antenna unit in the antenna group such that electromagnetic waves transmitted by all antenna units in the antenna array have a same phase or amplitude when the electromagnetic waves arrive at a measurement probe of a second device, where the electromagnetic wave is used to measure an over-the-air beam parameter of the first device, and a distance between the first device and the measurement probe is less than a far-field boundary distance.

Abstract: A method for determining direction information for at least one target object in a radar system for a vehicle. The first detection information is provided by at least two receive antennas of the radar system, wherein the first detection information is specific for a first radar signal transmitted by a first transmit antenna of the radar system. The second detection information is provided by the at least two receive antennas of the radar system, wherein the second detection information is specific for a second radar signal transmitted by a second transmit antenna of the radar system. A first angle determination and a second angle determination are performed. At least one comparison of the first angle information with the second angle information is performed in order to detect an ambiguity in the first angle determination for the determination of the direction information.

Abstract: A distributed radio access network (RAN) is provided. A selected wireless transceiver node(s) in a selected coverage cell receives a radio frequency (RF) test signal(s). The selected wireless transceiver node(s) determines an effective gain value based on a predefined characteristic of the RF test signal(s). The selected wireless transceiver node(s) communicates the effective gain value and other related parameters to a server apparatus in the distributed RAN. The server apparatus determines a common gain value for the selected wireless transceiver node(s) in the selected coverage cell based on the parameters. Accordingly, the selected wireless transceiver node(s) operates based on the common gain value.

Abstract: Techniques are provided to implement hardware accelerated application of preconditioners to solve linear equations. For example, a system includes a processor, and a resistive processing unit coupled to the processor. The resistive processing unit includes an array of cells which include respective resistive devices, wherein at least a portion of the resistive devices are tunable to encode entries of a preconditioning matrix which is storable in the array of cells. When the preconditioning matrix is stored in the array of cells, the processor is configured to apply the preconditioning matrix to a plurality of residual vectors by executing a process which includes performing analog matrix-vector multiplication operations on the preconditioning matrix and respective ones of the plurality of residual vectors to generate a plurality of output vectors used in one or more subsequent operations.

Abstract: A system for testing a radar under test is provided. The system comprises an antenna array with a plurality of antenna elements, a plurality of transceivers downstream to the plurality of antenna elements and a processing unit. In this context, the processing unit is configured to communicate the radar under test by transmitting and/or receiving a two dimensional test pattern and to compare the two dimensional test pattern with a reference pattern.

Abstract: An improved circuit configuration is disclosed for calibrating and/or verifying the operation of phase shifters in a phased array radar system. In one illustrative embodiment, a method includes: (i) programming a set of phase shifters to convert a radio frequency signal into a set of channel signals; (ii) splitting off a monitor signal from each channel signal while coupling the set of channel signals to a set of antenna feeds; and (iii) while taking the monitor signals in pairs associated with adjacent channels, measuring a relative phase between each pair of monitor signals.

Abstract: The invention relates to a method on a radar measuring system for determining a uniform speed, in which method two antenna pairs, each consisting of a transmitting antenna and a receiving antenna, are mapped to the same position within a virtual antenna arrangement.

Abstract: A vehicle ADAS target or fixture is configured with an Inertial Measurement Unit (IMU) consisting of a combination of accelerometers and gyroscopes capable of estimating a relative position and orientation within the spatial volume of the vehicle service area by tracking changes in acceleration and rotation. A controller monitors movement of the IMU relative to an established reference location, generating output utilized by a vehicle service system to guide a technician to position and orient the vehicle ADAS target or fixture at a selected location within the vehicle service area required to conduct a vehicle ADAS service procedure.

Abstract: Examples disclosed herein relate to an antenna calibration method for a beam steering radar. A first set of input voltages is determined for a plurality of phase shifters coupled to a plurality of antenna elements in an antenna array in the beam steering radar, the voltages to control phases of signals for transmission by the antenna array. A first set of input voltages is applied to the antenna array. Radiating signals resulting from the first set of input voltages are measured. Voltage and phase values for the plurality of phase shifters are iteratively optimized to determine voltage and phase value pairs that result in a desired gain for the antenna array. The voltage and phase value pairs are stored in a look-up-table in the beam steering radar.

Abstract: A method for improving an evaluation of object identification of a radar device of a motor vehicle. A first map is generated of the surroundings of said surroundings by a LiDAR scanner. A first object identification is performed on the basis of the generated first map of the surroundings by a first identification apparatus. A ground-truth model is created of the surroundings on the basis of the performed first object identification by the first identification apparatus. A second map is generated of the surroundings of the surroundings by the radar device. A second object identification is repeatedly performed using alternative object identification algorithms on the basis of the generated second map of the surroundings by a second identification apparatus of the radar device. A radar model is created of the surroundings on the basis of the repeatedly performed second object identification by means of the second identification apparatus.

Abstract: An electronic device may include radar circuitry. Control circuitry may calibrate the radar circuitry using a multi-tone calibration signal. A first mixer may upconvert the calibration signal for transmission by a transmit antenna. A de-chirp mixer may mix the calibration signal output by the first mixer with the calibration signal as received by a receive antenna or loopback path to produce a baseband multi-tone calibration signal. The baseband signal will be offset from DC by the frequency gap. This may prevent DC noise or other system effects from interfering with the calibration signal. The control circuitry may sweep the first mixer over the radio frequencies of operation of the radar circuitry to estimate the power droop and phase shift of the radar circuitry based on baseband calibration signal. Distortion circuitry may distort transmit signals used in spatial ranging operations to invert the estimated power droop and phase shift.

Abstract: A digitally modulated radar, DMR, transmitter module is disclosed comprising: a sequence generator, configured to generate a repeating digital sequence signal based on a relatively low-frequency clock signal; a mixer configured to combine the digital sequence signal with at least one phase-delayed copy of the digital sequence signal, to provide a combined signal; and a modulator configured to modulate a relatively high-frequency carrier signal, in dependence on the combined signal, to provide a modulated signal. Corresponding systems and methods are also disclosed.

Abstract: Antennas used aboard vehicles to communicate with satellites or ground stations may have complex antenna patterns, which may vary as the vehicle moves throughout a given coverage area. Techniques are disclosed for dynamically adjusting the instantaneous power fed to an antenna system to ensure that the antenna transmits at the regulatory or coordinated effective isotropic radiated power (EIRP) spectral limit. The antenna may transmit, in accordance with vehicle location and attitude, steerable beam patterns at different scan and skew angle combinations, causing variations in antenna gain and fluctuations in the transmitted EIRP. Using on-board navigational data, an antenna gain and ESD limit may be calculated for a particular scan and skew angle, which may be used to adjust power fed to the antenna such that the antenna transmits substantially at maximum allowable EIRP as the steerable beam pattern is adjusted.

Abstract: The present invention, Methods for RF or Acoustic Boresighting, is a collection of various methods of accounting for and correcting for the errors that occur in a receiver during signal collection, and are an extension of patent Ser. No. 10/185,022, by using Radio Frequency coupling as opposed to switches. These updated methods enable a means to ensure a collected signal can be calibrated at any point during the signal collection period without having to cease signal collection in order to switch in a reference signal. These methods also account for signal bandwidth and signal type, including wideband, pulse, and continuous signals.

Abstract: A radar reflector is positioned at a predetermined angle and distance from a device to be tested. The device to be tested includes at least one of a transmit phased array antenna and a receive phased array antenna. At least two antenna elements of the at least one of a transmit phased array antenna and a receive phased array antenna are activated to carry out one of transmitting and receiving. A plurality of phase control settings are cycled through to determine an optimum phase control setting for the predetermined angle.

Abstract: A calibration system calibrates one or more vehicle sensors. The calibration system includes a measuring tool coupleable to a vehicle including the vehicle sensors. The measuring tool generates measurement data associated with a first set of measurements between the measuring tool and a target spaced from the vehicle. The calibration system further includes a line-end tester that compares the measurement data with configuration data associated with a second set of measurements between the measuring tool and the vehicle sensors, and determines one or more aiming parameters associated with the vehicle sensors based on the comparison.

Abstract: A mechanism is provided for estimating mounting orientation yaw and pitch of a radar sensor without need of prior knowledge or information from any other sensor on an automobile. Embodiments estimate the sensor heading (e.g., azimuth) due to movement of the automobile from radial relative velocities and azimuths of radar target detections. This can be performed at every system cycle, when a new radar detection occurs. Embodiments then can estimate the sensor mounting orientation (e.g., yaw) from multiple sensor heading estimations. For further accuracy, embodiments can also take into account target elevation measurements to either more accurately determine sensor azimuth and yaw or to also determine mounting pitch orientation.

Abstract: A satellite receiver includes: demultiplexing units each demultiplexing, into subchannel signals of a predetermined band, a digital reception signal obtained by converting a calibration signal received by a corresponding one of receiving antenna elements into a digital signal; excitation coefficient multiplication units multiplying the subchannel signals by an excitation coefficient; a complex adder adding the subchannel signals multiplied by the excitation coefficient together for each subchannel signal of the same band; a correlation detection unit calculating, with the use of one demultiplexing unit as a reference demultiplexing unit, a cross-correlation value for each subchannel signal output from each demultiplexing unit different from the reference demultiplexing unit with respect to a subchannel signal of a same band output from the reference demultiplexing unit; and an excitation coefficient generation unit generating a corrected excitation coefficient based on a cross-correlation value and an excitat

Abstract: A polarization reconfigurable apparatus, a communications device, and a polarization reconfiguration method, the apparatus including a signal generation unit, a signal adjustment unit, a digital-to-analog conversion unit, and a transmission unit that are sequentially connected. A signal transmitted by a first port in the transmission unit is orthogonal to a signal transmitted by a second port in the transmission unit. The signal generation unit is configured to generate a first signal. The signal adjustment unit is configured to determine a polarization mode of a to-be-transmitted signal, divide the first signal into two first signals, and adjust an amplitude and a phase of a 1st first signal and an amplitude and a phase of a 2nd first signal based on the determined polarization mode.

Abstract: One or more radar sensors coupled to a vehicle receive readings during a calibration time period. Each radar sensor receives data covering a field of view of the sensor, which may be split into angle-based bins. A noise-reducing filter (e.g., median filter) may be applied. A function is generated by processing raw radar cross section (RCS) returns into values plotted against angles compared to the direction that the sensor is facing. The function may be smoothed. Radar sensor measurements captured after calibration are corrected using the function, for example by automatically subtracting or dividing amounts corresponding to the function.

Abstract: Apparatuses and methods for two-dimensional beam scanning for determining the position of an object in three-dimensional space are provided. An apparatus comprises a multiplicity of transmitters and receivers, which are arranged orthogonal to one another in an L-, U- or T-shaped structure. In one apparatus, the transmission signals are frequency and phase modulated in combination; and in another apparatus a single frequency carrier signal is subject to binary phase modulation. Here, this is a high-frequency encoding with a great code length, which is generated according to the pseudo-random number principle. The received signals, which include information from all transmitters, are decoded and consequently split into sub-signals, which can be assigned to a two-dimensional virtual array. According to the method of digital beamforming, the individual signals of the virtual antenna elements are formed into a plurality of highly focused beams in the horizontal and vertical direction.

Abstract: A communication apparatus includes an antenna array having a plurality of antenna elements, and a plurality of thermoelectric devices that are arranged on the plurality of antenna elements of the antenna array. The communication apparatus further includes a processor that determines which subset of the antenna elements of the plurality of antenna elements are in an activated state and which are in a deactivated state, and further control each of the plurality of thermoelectric devices to execute an activation or a deactivation of each of the plurality of thermoelectric devices in synchronization with the activated state or the deactivated state of different subsets of antenna elements of the plurality of antenna elements.

Abstract: Methods and systems for providing location fencing within a controlled environment are disclosed herein. A location fencing server determines a location of a first inmate based on a first beacon device, and determines a location of a second inmate based on a second beacon device. Further, the location fencing server determines a proximity status based on the location of the first inmate and the location of the second inmate. Additionally, the location fencing server determines that the first inmate and the second inmate are in violation of a proximity policy based on the proximity status. In some embodiments, the location fencing server sends a notification to an employee device based on the violation of a proximity policy.

Abstract: A radar system comprises a radar device defining upper and lower pairs of mounting tabs and being configured to transmit and receive electromagnetic waves based on a squint angle, a mounting device configured to be attached to a surface and to receive the radar device, wherein the mounting device defines upper and lower pairs of connection position assurance (CPA) features that correspond to the upper and lower pairs of mounting tabs, and a pair of mounting tab caps configured to be selectively installed on the upper or lower pairs of mounting tabs to offset the squint angle of the radar device.

Abstract: A laser radar device includes: a modulator (8) for causing a transmission seed light beam to branch, and giving different offset frequencies to a plurality of the transmission seed light beams having branched, and then modulating the plurality of transmission seed light beams into pulsed light beams and outputting the pulsed light beams, or for modulating the transmission seed light beam into a pulsed light beam, causing the pulsed light beam to branch, and giving the different offset frequencies to a plurality of the pulsed light beams having branched, and then outputting the plurality of pulsed light beams; a band pass filter (14) in which a frequency band including frequencies of signal components included in a plurality of beat signals detected by an optical heterodyne receiver (13) is set as a pass band and a frequency band not including the frequencies of the signal components is set as a cutoff band; and an ADC (15) for sampling the beat signals passing through the band pass filter (14) at a sampling f

Abstract: There are provided methods and systems configured to perform calibration of antenna array systems, for example during production, avoiding the use of external setups or external measurements. The method comprising: (i) measuring the delay of a dedicated calibration transmission line for each SUT, for example during production, using internal built-in system capabilities; (ii) comparing the measured delay to a known delay of an identical transmission line of a reference system; (iii) computing, based on this comparison, compensation values with respect to the reference system of delay (or phase), for all transmission lines of the SUT; (iv) calibrating the SUT using the computed compensation values for all transmission lines of the SUT.

Abstract: An object of the present invention is to provide a method capable of calibrating a sensor function required in a safety design of a radar safety sensor in real time. A calibration station (11) is provided on a traveling route of an unmanned vehicle (1) on which a safety sensor (3) for detecting an obstacle (2) ahead is mounted, and a standard reflection is provided at a position of a maximum measurement distance (L) of the safety sensor (3) at the calibration station (11). Prior to normal traveling of the unmanned trolley 1, the unmanned trolley 1 is moved to the calibration station 11 in advance, and the reference value obtained by measuring the standard reflector 12 with the safety sensor 3 is taught, During normal operation of the unmanned trolley 1, every time the unmanned trolley 1 reaches the calibration station 11, the measured value obtained by measuring the standard reflector 12 by the safety sensor 3 is compared with a reference value. Calibrate the sensor function of FIG. 1.

Abstract: Techniques for predicting safety metrics associated with near-miss conditions for a vehicle, such as an autonomous vehicle, are discussed herein. For instance, a training system identifies an object in an environment and determines a trajectory for the object. The training system may receive a trajectory for a vehicle and associate the trajectory for the object and the trajectory for the vehicle with an event involving the object and the vehicle. In examples, the training system determines a parameter associated with motion of the vehicle as indicated by the trajectory of the vehicle relative to the trajectory of the object, and the event. Then, the training system may determine a safety metric associated with the event that indicates whether the vehicle came within a threshold of a collision with the object during a time period associated with the event.

Abstract: A method includes outputting a plurality of simulated global navigation satellite system (GNSS) and interference signal pairs comprising a simulated GNSS signal and a simulated interference signal. Each of the simulated GNSS signals, or the simulated interference signals, has an associated reference signal. A calibration GNSS signal that combines the simulated GNSS signals and the associated reference signals, or a calibration interference signal that combines the simulated interference signals and the associated reference signals is received. A phase, time, or a power offset is calculated for the simulated GNSS signals based on the calibration GNSS signal and the associated reference signals, or for the simulated interference signals based on the calibration interference signal and the associated reference signals.

Abstract: A vector network analyzer is provided which includes a first measuring port, a digital interface connected to the first measuring port, a second measuring port adapted to be connected to a radio frequency (RF) input or output of a device under test (DUT), and a processor. The digital interface is adapted to be connected to a digital input or output of the DUT. The processor is adapted to determine scattering parameters (S-parameters) of the DUT based on measuring signals transmitted to the DUT and received from the DUT by the first measuring port and the second measuring port.

Abstract: Provided are an array communication device that makes phase correction between a plurality of arrays having bi-directional amplifiers possible and a method for controlling the array communication device. This array communication device comprises a plurality of array units that are connected to a common signal processing unit and each comprise an antenna, amplifier, and phase shifter. The array communication device further comprises first-directional couplers that are respectively disposed between the antennas and amplifiers of the array units and divide or combine signals, second-directional couplers that are respectively disposed between the phase shifters of the array units and the signal processing unit and divide or combine signals, and phase comparison means that each receive at least one from among a signal from a first-directional coupler and a signal from a second-directional coupler and a signal serving as a phase reference and carry out phase comparison and correction.

Abstract: A GPR system the implements a modified multistatic mode of operation is provided. The GPR is suitable for mounting on an unmanned aerial vehicle. The GPR system has radar transceivers. The GPR system transmits transmit signal serially via the transceivers. For each transceiver that transmits a transmit signal, the GPR system receives a return signal acquired by each transceiver except for a return signal for the transceiver that transmits the transmit signal. The GPR system outputs of matrix of return signals that includes a null value for the return signals of the transceivers that transmit.

Abstract: According to one embodiment, an electronic apparatus includes a receiver and a signal addition circuit. The receiver receives a reception signal of a first frequency band. The signal addition circuit is configured to input the reception signal and a calibration signal of a second frequency band which is different from the first frequency band to the receiver.

Abstract: A base station antenna includes a first antenna having first and second spaced-apart columns of first radiating elements therein, which are configured to operate within a first frequency band. An active antenna system (AAS) is provided, which is configured to operate within a second, typically higher, frequency band. The AAS includes a second antenna within a space between the first and second columns of first radiating elements. These first radiating elements may include tilted feed stalks which support higher integration by enabling the first radiating elements to overhang at least a portion of the second antenna.

Abstract: A computer includes a processor and a memory storing instructions executable by the processor to collect a plurality of data sets, each data set from a respective sensor in a plurality of sensors, and each data set including a range, an azimuth angle, and a range rate for a detection point of the respective one of the sensors on an object to determine, for each detection point, a radial component of a ground speed of the detection point based on the data set associated with the detection point and a speed of a vehicle, and to generate a plurality of clusters, each cluster including selected detection points within a distance threshold from each other and having respective radial components of ground speeds that are (1) above a first threshold and (2) within a second threshold of each other.

Abstract: A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.

Abstract: Illustrative methods and circuits to verify operation of phase shifters. One illustrative method includes: obtaining a first set of in-phase and quadrature components (I1,Q1) of a phase shifter output signal with a first setting; measuring a second set of components (I2,Q2) with a second setting, the second setting being offset from the first by a predetermined phase difference; and combining the first and second sets to determine whether their relationship corresponds to the predetermined phase difference. An illustrative transmitter includes: a phase shifter, an I/Q mixer, and a processing circuit. The phase shifter converts a transmit signal into an output signal having a programmable phase shift. The I/Q mixer mixes the output signal with a reference signal to obtain in-phase and quadrature components of the output signal. The processing circuit is coupled to the I/Q mixer implement the disclosed method.

Abstract: Systems and methods are provided for generating a radar model for a target object. In embodiments, a target simulation model is received that represents one or more physical aspects of a target object, an environment simulation model is received that represents one or more physical aspects of an environment object, and a target distance parameter is received that identifies a reference distance between the target object and a radar system to be simulated. A simulation model is generated based, at least in part, on the target simulation model, the environment simulation model, and the reference distance, and further based on a target aspect angle that identifies an angular position of the target object in relation to the radar system.

Abstract: A method for calibrating a vehicular radar sensing system includes disposing two spaced apart calibrating radars at respective transmitting locations that are spaced from a vehicle calibration location at an end of line portion of a vehicle assembly line, and moving a vehicle along the vehicle assembly line, the vehicle including an electronic control unit (ECU) and a vehicular radar operable to sense exterior of the vehicle. Signals are transmitted via the first and second calibrating radars at the transmitting locations and, with the vehicle at the vehicle calibration location, the plurality of radar receivers of the vehicular radar receive the transmitted signals transmitted by the first and second calibrating radars, and the vehicular radar generates an output that is processed at the ECU. Responsive to processing at the ECU of the output of the vehicular radar, misalignment of the vehicular radar at the vehicle is determined.

Abstract: The present disclosure provides a beam synthesis method for measuring an array antenna. The method includes: obtaining a phase, an amplitude, and related distance values of each antenna unit, where the related distance values include a first distance value and a second distance value; calculating a phase directivity pattern of each antenna unit, and compensating the phase directivity pattern of each antenna unit based on the phase and the first distance value of each antenna unit, to obtain a phase error value of each antenna unit; and synthesizing radio frequency signals of a plurality of antenna units based on the phase, the amplitude, the second distance value, and the phase error value of each antenna unit, to obtain an antenna beam.

Abstract: A method for receiving a wireless signal, performed by a first communication node, may comprise: storing a wireless signal received by the first communication node as samples in a buffer; performing partial correlation operations on the stored samples by a plurality of partial correlators; performing a first FFT operation on results of the partial correlation operations; performing a cumulative product operation on results of the first FFT operation; performing a second FFT operation based on a result of the cumulative product operation; and performing synchronization estimation based on the results of the first FFT operation and a result of the second FFT operation.

Abstract: Systems and methods are disclosed herein for self-calibration of an analog beamforming transceiver. In some embodiments, a method of operation of a self-calibration subsystem of an analog beamforming transceiver comprises, for each of multiple receive antenna elements for each of multiple transmit beam directions: transmitting a signal in the transmit beam direction via multiple transmit antenna elements of a second polarization and obtaining a measurement value for a received signal received via the receive antenna element of a first polarization responsive to the transmitted signal. The method further comprises computing calibration values for the receive antenna elements of the first polarization and calibration values for the transmit antenna elements of the second polarization based on the obtained measurement values.

Abstract: Techniques for accurately determining a velocity of a radar (or ultrasonic, sonar) device and/or a moveable platform associated with the radar device may comprise fitting a model to a set of Doppler values received from the device, and determining the velocity based at least in part on the model. Fitting the model to the set may comprise determining a residual between an estimated Doppler value generated by the model and a measured Doppler value and altering a parameter of the model based at least in part on an asymmetrical loss function and the residual. The asymmetrical loss function may comprise a first portion that comprises a square of the residual and a second portion that is linearly proportional to the residual. The second portion may be based at least in part on an estimated velocity and/or estimated Doppler value and may account for out-of-plane returns.

Abstract: A miniaturized, portable and automatic air-traffic control (ATC) system to determine the position of air vehicles is described. The system is composed by a portable control tower that detects manned air traffic equipped with ADS-B or transponder, and a computer compatible software to display the position of the detected air vehicles. This system is used in conjunction with a drone system, providing to the latter the air-traffic local information. The information given to the drone system allows performing automatic collision avoidance with the air vehicles detected in the flight area of the drone.

Abstract: A radar system includes a local oscillator for generating a local oscillator signal, transmission channels, and a reception channel. The transmission channels are designed to generate and output RF radar signals based on the local oscillator signal The transmission channels have phase shifters for setting the phase of the RF radar signals. The reception channel is designed to receive an RF signal and to convert it into a baseband signal by using the local oscillator signal supplied thereto. A method includes operating the local oscillator in a CW mode, setting a specific combination of phase shifts for the phase shifters of the transmission channels, altering the phase of the local oscillator signal supplied to the reception channel or of the phase shifts of the phase shifters by a phase offset, and ascertaining that phase offset for which the baseband signal at least approximately assumes a maximum.

Abstract: Methods and apparatus are provided for calibrating an antenna array in a receiver. A training signal for calibrating the antenna array is injected into a data signal received on each receive path to generate combined signals on each receive path. The combined signals are equalized by respective equalizers. The coefficients of the equalizers are determined by comparing a feedback signal for each receive path with the equalized signal to estimate the impairment on each received path. The estimated impairment on each receive path is used to adapt the equalize coefficients for a respective equalizer to compensate for the impairment. After equalization, an estimate of the observed training signal on each receive path is subtracted from the equalized signal for the same receive path to generate estimates of the received data signals for demodulation and decoding.