An embodiment system may include a first millimeter-wave radar sensor coupled to a driver-side door of a vehicle, and a second millimeter-wave radar sensor coupled to a side-view mirror of the vehicle adjacent to the driver-side door. The first millimeter-wave radar sensor may be configured to produce a first set of radar data indicative of a presence of an object within a first field of view, and the second millimeter-wave radar sensor may be configured to produce a second set of radar data indicative of a presence of the object within a second field of view. The system may further include a processing circuit coupled to the first millimeter-wave radar sensor and the second millimeter-wave radar sensor, and a controller coupled to the processing circuit, the controller being configured to control an operation of the vehicle based on a control signal provided to the controller by the processing circuit.

A method in an illustrative embodiment includes determining that a first object authenticated by an electronic device is accessing the electronic device. The method further includes, in response to a second object being detected within a detection range using a radar of the electronic device, determining, based on a detected signal, that the second object is a person. The method further includes determining a distance and an angle between the second object and the electronic device based on an azimuth signal in the detected signal. The method further includes in response to determining that the distance is less than a distance threshold and the angle is less than an angle threshold, determining, based on the biological feature signal, whether the second object is trustworthy. The method further includes deauthenticating the first object in response to determining that the second object is untrustworthy.

A radar sensor for use within a vehicle includes blockage detection functionality. In at least one embodiment, the radar sensor collects information on stationary infrastructure around the vehicle. The infrastructure information may be used to generate a Doppler Monopulse Image (DMI) or other graph for the sensor. A clutter ridge within the DMI or other graph may be analyzed determine a blockage condition of the sensor (i.e., unblocked, partially blocked, or fully blocked).

A method for spectral estimation of the clutter of a haline liquid medium received by an oceanographic radar, such as a lake, a river, a sea or an ocean, from an array of antennas including at least three antennas. The method includes forming at least two sub-arrays of antennas from the array of antennas, each of the sub-arrays including at least one antenna less than the array of antennas, calculating a beam in one direction for each sub-array of antennas, locating in azimuth all the sources included in the beam from data of the beam coming from each of the sub-arrays, estimating the energy of each of the located sources, selecting a source, referred to as preferred source, among a plurality of sources according to a predetermined criterion when the beam includes a plurality of sources.

An example device includes motion sensing and processing circuitry to generate compensated motion data for a first time based on raw motion data and a set of motion indicators including a velocity indicator for the device calculated based on the raw motion data; a radar sensor to receive reflections indicating detections and generate data points for the first time representing the detections, in which each data point includes position and velocity information of a corresponding detection relative to the radar sensor; a first circuit to generate object data for the first time based on the set of the data points and the compensated motion data for the first time; and a second circuit to calculate, based on the object data for the first time and a characteristic of the radar sensor, for each cell in a grid representing an FOV of the radar sensor at the first time, probabilities of the cell being in a free state, a stationary state, and a dynamic state.

Reception antennas include first antennas at positions different in a first direction, second antennas at positions different in a second direction perpendicular to the first direction, and a third antenna different from the first or second antenna. The first and second antennas include one overlapping antenna. The third antenna is arranged at a position different in the second direction from a position of the first antennas. The third antenna is arranged at a position a prescribed spacing apart in the first direction from a position of the second antennas. At least one spacing of the first antennas is the prescribed spacing. Transmission antennas include fourth antennas arranged in the first direction and fifth antennas arranged in the second direction. The fourth antennas and the fifth antennas include one overlapping antenna. A spacing of the fourth antennas is wider in the first direction than an aperture length of the first antennas.

A millimeter or mm-wave system includes transmission of a millimeter wave (mm-wave) radar signal by a transmitter to an object. The transmitted mm-wave radar signal may include at least two signal orientations, and in response to each signal orientation, the object reflects corresponding signal reflections. The signal reflections are detected and a determination is made as to location of the object.

A radar system comprises a plurality of transmit antennas that transmit a radar signal toward a target, wherein each transmit antenna transmits its signal using a different space-time block code in a given transmission time slot. In one embodiment, no two transmit antennas transmit using the same space-time block code in the same transmission time slot.

Method and apparatus for enhance medical imaging and identification with potential image resolution up to 1000 times smaller than diffraction limit, wavelength. Recording of wavefront of good body penetrating Radio Frequency (RF) electromagnetic waves in form of digital hologram allows to recreate 3 dimensional images of objects. Reference signals in set of monopulse antennas with overlapping squinted beams provides enhanced image resolution and allows suppression of scattering medium influence. Transforming of reflected near field signals to frequency-space-time domains allows identification of objects and scattering medium by spectrum signatures. Direct digitizing and digital interface for connection to multi-channel signal processor allows loose distributing of transceiver antenna modules around object or in small space.

A radar receiver includes an analogue receiver for receiving a radar echo signal and a digital receiver. The digital receiver includes an analogue-to-digital converter arranged to receive and sample an IF analogue signal from the analogue receiver. The sampling is undersampling according to the Nyquist criterion, so that a plurality of IF digital signals are produced, in different Nyquist zones, including one or more aliased IF digital signals. The digital receiver is arranged to select an IF digital signal from the one or more aliased digital signals.