An automotive radar system for detecting target objects in a traffic scene comprises an arrangement of transmit antennas, an arrangement of receive antennas, and a radar circuit connected to the transmit antennas and the receive antennas. Each transmit antenna is configured to transmit coherent superpositions of respective first transmit radar signals having first transmit polarizations and respective second transmit radar signals having second transmit polarizations. Each receive antenna is configured to separate target reflections of the transmitted radar signals received from the target objects into first signal portions having first receive polarizations and into second signal portions having second receive polarizations. The radar circuit is configured to vary resulting transmit polarizations of the transmitted superpositions of transmit radar signals and to coherently evaluate the first and second signal portions received by the individual receive antennas to determine polarization properties of the received target reflections.

The system and method for chromatic correlation interferometry direction finding (CIDF) used to resolve ambiguities. Ambiguities are overcome by correlating over a range of frequencies. In some cases, multiple (i.e., 2 or more) frequencies or a continuous range of frequencies are used to make a more robust correlation manifold. As the complex response manifold is frequency dependent, using a set of two or more manifolds provides a significant reduction of false peaks.

A problem to solve is ensuring communication stability in a service area. One example of a preferable embodiment of the invention is a radio communications method adapted to control physical characteristics of electromagnetic waves that are transmitted by radio units. The radio communications method comprises the following: creating an electromagnetic field model for presuming a communication environment in a service area where the radio units exist by using information on positions and dimensions of objects in the service area; presuming communication characteristics of the radio units through the electromagnetic field model; and modifying the physical characteristics based on the communication characteristics and carrying out communication.

An electronic device according to various embodiments of the present disclosure may include a plurality of antenna arrays and at least one processor operatively connected to the plurality of antenna arrays. The at least one processor may transmit a first radio signal including a specific polarization, generated through a first antenna array of the plurality of antenna arrays. The at least one processor may receive a second radio signal which is a reflected signal of the first radio signal and includes the specific polarization, generated through a second antenna array different from the first antenna array of the plurality of antenna arrays. The at least one processor may identify external objects around the electronic device on the basis of the second radio signal. Other various embodiments may be possible.

A full duplex dual polar radar transceiver comprising a dual polarisation radar antenna, a transmission path, a horizontal polarisation receive path, and a vertical polarisation receive path, a first cancellation path connected between the transmission path and the vertical polarisation receive path, and a second cancellation path connected between the transmission path and the horizontal polarisation receive path. Each cancellation path is configured to vary a transmission signal provided by the transmission path by varying at least one of a phase shift, a delay, or an amplitude so as to cancel self-interference on each of the vertical and horizontal polarisation receive paths.

A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.

In a general aspect, a system for sensing pulses of radio frequency (RF) fields includes a laser system and a vapor cell sensor. The laser system is configured to generate beams of light that include a probe beam of light. The vapor cell sensor has a vapor therein and is configured to allow the beams of light to pass through the vapor. The system also includes an optical detector configured to generate a detector signal based on the probe beam of light. The system includes a signal processing system configured to perform operations that include receiving the detector signal from the optical detector over a time period. The operations also include generating a digital signal based on the detector signal and applying a matched filter to the digital signal to generate a filtered signal. The filtered signal is processed to determine properties of an RF field experienced by the vapor.

A method for determining angular orientation of an object in two or more directions. The method includes: generating a scanning polarized RF source signal; receiving the scanning polarized RF source signal at one or more cavities of a sensor disposed on the object; measuring the scanning polarized RF source signal at a first portion of the sensor; reflecting the scanning polarized RF source signal toward a second portion of the sensor; measuring the scanning polarized RF source signal at the second portion of the sensor; and determining the angular orientation of the object in the two or more directions based on the measured signal at the first and second portions of the sensor.

An autonomous vehicle control system includes one or more processors. The one or more processors are configured to cause a transmitter to transmit a transmit signal from a laser source. The one or more processors are configured to cause a receiver to receive a return signal reflected by an object. The one or more processors are configured to cause one or more optics to generate a first polarized signal of the return signal with a first polarization, and generate a second polarized signal of the return signal with a second polarization. The one or more processors are configured to calculate a value of reflectivity based on a signal-to-noise ratio (SNR) value of the first polarized signal and an SNR value of the second polarized signal. The one or more processors are configured to operate a vehicle based on the value of reflectivity.

A method for detecting the presence of on-body concealed objects includes receiving a visible-domain camera image for a scene, determining, using the visible-domain camera image, a region of interest where a subject is present, receiving an infrared-domain camera image and a millimeter-wave (mmwave) radar image that each cover the region of interest, determining emissivity information for the region of interest using the infrared-domain camera image, determining reflectivity information for the region of interest using the mmwave radar image and determining a concealed object classification for the subject based on the emissivity information and the reflectivity information. A corresponding system and computer program product for executing the above method are also disclosed herein.