An apparatus for estimating a DOA in a MIMO system includes a receiver and a signal processor. The receiver receives Rx signals from a target through Rx antennas after Tx signals having different phases are transmitted through Tx antennas, and transforms the Rx signals into time domain Rx signals. The processor transforms the time domain Rx signals into Rx signals in a frequency domain including a range-related domain and a velocity-related doppler domain; divides the doppler domain into regions according to a phase difference between the Tx signals; extracts signals from the regions; combines the signals to form first and second arrays; determines a minimum value for each of the first and second arrays using a DML algorithm; selects one of the first and second arrays having the minimum value as a true array; and estimates a DOA corresponding to the true array as an actual DOA of the target.

Disclosed are techniques for environment sensing. In an aspect, a first network node measures one or more first reference signals on a first carrier frequency, the one or more first reference signals received from a second network node to enable determination of one or more first characteristics associated with one or more target objects, and measures one or more second reference signals on a second carrier frequency, the one or more second reference signals received from the second network node to enable determination of one or more second characteristics associated with the one or more target objects, wherein an accuracy of the one or more second characteristics is higher than an accuracy of the one or more first characteristics based on the one or more first reference signals being measured on the first carrier frequency and the one or more second reference signals being measured on the second carrier frequency.

Implementations described and claimed herein provide systems and methods for obstacle detection. In one implementation, a beam is transmitted at an elevation orientation from a transmit array system. The transmit array system includes transmit antenna arrays each having one or more transmit antennas. Target scatter is received at a receive array system including one or more receive channels. A virtual array is synthesized for the elevation orientation from an incidence of the target scatter on each of the one or more receive channels for each of the one or more transmit antennas. The virtual array has a size corresponding to the one or more transmit antenna arrays convolved with the receive array system. Four dimensional space information is generated from the virtual array, and any obstacles along a travel path are detected from the four dimensional space information.

Disclosed is a method and apparatus for processing a radar signal by correcting a phase distortion. The method includes generating radar data based on a radar transmission signal transmitted through an array antenna of a radar sensor based on a frequency modulation model and a radar reception signal received through the array antenna as the radar transmission signal is reflected by a target, correcting the radar data using a correction vector for correcting a feedline error occurring due to a feedline delay difference between channels of the array antenna, and estimating a direction of arrival corresponding to the corrected radar data using a direction matrix reflecting a phase shift of the corrected radar data according to frequency modulation characteristics of the frequency modulation model.

An electronic device comprises: a transmission antenna configured to transmit transmission waves; a reception antenna configured to receive reflected waves resulting from reflection of the transmission waves; and a controller. The controller is configured to detect an object reflecting the transmission waves, based on a transmission signal transmitted as the transmission waves and a reception signal received as the reflected waves. The controller is configured to classify a detection result of the object reflecting the transmission waves depending on a degree of certainty, and output the classified detection result.

An electronic device comprises a plurality of sensors and a main controller. The plurality of sensors are each configured to detect, based on a transmission signal transmitted from a transmission antenna as transmission waves and a reception signal received by a reception antenna as reflected waves, an object reflecting the transmission waves T. The main controller is configured to control the plurality of sensors independently of each other.

A method for using a radar assembly to sense an environment includes a radar system that has an antenna assembly secured for 360-degree rotation, the antenna assembly having mounted thereon at least one transmit antenna, and a first set of three or more separate fixed receive antennas, with the antenna assembly having a greater width than height so as to create a fanbeam. In the method of the present invention, the antenna assembly is rotated to a first azimuth position, and then an FMCW waveform is transmitted within the fanbeam, and reflections are received from targets in the environment while in the first azimuth position. Based on the received reflections, data is processed and stored. These steps are repeated for all other azimuths until an azimuth sweep has been completed. At that time, a full environmental data set is compiled for the environment, where the data set comprises azimuth data, range data, elevation data and RCS data. The data set is gathered and delivered to a controller for analysis.

The disclosure relates to a radar system in which multiple radar transceivers are synchronised with a common clock signal. In example embodiments a radar system (200) comprises: a control module (205); a processing module (206); a plurality of radar transceivers (201.sub.1-n); and a communications bus (211) connecting the control module (205) to one or more of the plurality of radar transceivers (201.sub.1-n), wherein the control module (205) is configured to generate a first clock signal and transmit the first clock signal via the communications bus (211) to one or more of the plurality of transceivers (201.sub.1-n) and to receive radar data from the plurality of transceivers (201.sub.1-n) via the communications bus (211), wherein each of the plurality of transceivers (201.sub.1-n) is configured to generate a second clock signal extracted from the first clock signal and to transmit and receive frequency synchronized radar signals based on the second clock signal, and wherein the processing module (206) is configured to: calculate a phase difference between the frequency synchronized radar signals; compensate for the measured phase difference; and process received radar signals from the plurality of transceivers (201.sub.1-n).

According to various embodiments, a radar device is described comprising a processor configured to generate a scene comprising an object based on a plurality of receive wireless signals, generate a ground truth object parameter of the object and generate a dataset representative of the scene and a radar detector configured to determine an object parameter of the object using a machine learning algorithm and the dataset, determine an error value of the machine learning algorithm using a cost function, the object parameter, and the ground truth object parameter and adjust the machine learning algorithm values to reduce the error value.

Provided is a radar apparatus. The radar apparatus includes a controller configured to generate a variable delay control signal whose value varies with time, a clock generator configured to generate a transmission clock and a reception clock delayed by a delay time varying according to the variable delay control signal than the transmission clock, a transmitter configured to emit a transmission pulse through a transmission antenna based on the transmission clock, a first receiver configured to receive a first echo pulse that the transmission pulse is reflected from a target through a first reception antenna and configured to generate a first recovery signal corresponding to the first echo pulse based on the reception clock, and a second receiver configured to receive a second echo pulse that is the transmission pulse reflected from the target through a second reception antenna and configured to generate a second recovery signal corresponding to the second echo pulse based on the reception clock. The controller is configured to obtain a distance of the target based on at least one of a first delay time between the transmission clock and the reception clock corresponding to the first recovery signal and a second delay time between the transmission clock and the reception clock corresponding to the second recovery signal.