A radar apparatus includes: a radar transmission signal generator, which in operation, outputs a plurality of radar signals; a switching controller, which in operation, switches among plurality of transmitting antennas in sequence in a determined order to every one radar signal transmission period; and a radio transmitter, which in operation, transmits one radar signal every one radar signal transmission period through a allocated transmitting antenna to which switching has been made. A plurality of transmission timings at which the allocated transmitting antennas to which switching have been made transmit each of the plurality of radar signals within a determined period have identical time differences from a reference timing within the determined period.

In a radar system, a cancellation circuit is described for compensating for the effects of spillover between each transmitter and a receiver. The cancellation circuit is configured for applying cancellation signals to the receiver which are generated in a cancellation filter utilizing a primary impulse response characteristic corresponding to the spillover, a signal to be transmitted from each transmitter in the radar system, and a range profile output from the receiver. The cancellation circuit may also include a secondary impulse response characteristic module and a dithering module to improve the sensitivity of the receiver.

In an embodiment, a downlight includes: a plurality of light emitting diodes (LEDs) disposed in a housing of the downlight, and a millimeter-wave radar. The millimeter-wave radar includes: an antenna disposed in the housing, a controller configured to: detect a presence of a human in a field-of-view of the millimeter-wave radar, determine a direction of movement of the detected human, and produce log data based on the direction of movement of the detected human, and a wireless module configured to transmit the log data to a wireless server.

A radar system and a method for detecting a target using the radar system. The radar system includes a waveform generator, a plurality of phase shifters, at least one mixer, an analog-to-digital converter, a fast Fourier transform (FFT) processor, and a processor. The waveform generator generates a frequency-modulated continuous wave (FMCW) signal including a set of chirps repeated for a predetermined number of times. The phase shifters shift a phase of each chirp on a transmit branch. The phases transmitted via first and second transmit branches are shifted in accordance with first and second sets of regularly spaced phases, respectively. The first and second sets of regularly spaced phases have first and second phase differences, respectively, that are different from each other. The FFT processor performs FFT processing and the processor determines an angle of direction of the target based on range Doppler map bins.

Apparatus and methods are presented for characterising the environment of a user platform. In certain embodiments RF signals are transmitted and received through an antenna array having a plurality of elements activated in a predetermined sequence, and received signals are manipulated with round-trip path corrections to enhance the gain of the array in one or more directions. Objects in those directions are detected from the receipt of returns of transmitted signals, and the manipulated received signals processed to estimate range to those objects. In other embodiments RF signals transmitted by one or more external transmitters are received and manipulated to enhance the gain of a local antenna array or antenna arrays associated with the one or more transmitters to enhance the gain of the arrays in one or more directions. Objects in those directions are detected from the receipt of reflected signals from the transmitters, and the manipulated received signals processed to estimate range to those objects.

A method is provided that includes a vehicle receiving data from an external computing device indicative of at least one other vehicle in an environment of the vehicle. The vehicle may include a sensor configured to detect the environment of the vehicle. The at least one other vehicle may include at least one sensor. The method also includes determining a likelihood of interference between the at least one sensor of the at least one other vehicle the sensor of the vehicle. The method also includes initiating an adjustment of the sensor to reduce the likelihood of interference between the sensor of the vehicle and the at least one sensor of the at least one other vehicle responsive to the determination.

In an embodiment, a millimeter-wave system includes a first circuit having M channels, one or more antennas coupled to the first circuit, and a controller that includes a resource scheduler module. The controller is configured to operate the millimeter-wave system as a radar device and as a communication device based on an output of the resource scheduler module.

A radar includes transmitters, receivers, a memory, and a processor. The transmitters transmit radio signals, and the receivers receive reflected radio signals. The processor produces samples by correlating reflected radio signals with time-delayed replicas of transmitted radio signals. The processor stores this information as a first data structure, with information related to signals reflected from objects as a function of time (one dimension of the data structure) at various distances (a second dimension of the data structure) for various receivers (a third dimension of the data structure). The first data structure is processed to compute velocity and angle estimates, which are stored in second and third data structures, respectively. One or more memory optimizations are used to increase performance. Before storing the second and third data structures in a memory, the second and third data structures are sparsified to only include the outputs in specific regions of interest.

Various examples of methods and systems are provided for generation of correlated finite alphabet waveforms using Gaussian random variables in, e.g., radar and communication applications. In one example, a method includes mapping an input signal comprising Gaussian random variables (RVs) onto finite-alphabet non-constant-envelope (FANCE) symbols using a predetermined mapping function, and transmitting FANCE waveforms through a uniform linear array of antenna elements to obtain a corresponding beampattern. The FANCE waveforms can be based upon the mapping of the Gaussian RVs onto the FANCE symbols. In another example, a system includes a memory unit that can store a plurality of digital bit streams corresponding to FANCE symbols and a front end unit that can transmit FANCE waveforms through a uniform linear array of antenna elements to obtain a corresponding beampattern. The system can include a processing unit that can encode the input signal and/or determine the mapping function.

A radar sensing system for a vehicle includes at least one transmitter, at least one receiver, and a processor. The at least one transmitter is operable to transmit a radio signal at one of a plurality of carrier frequencies. The at least one receiver is operable to receive a radio signal which includes a reflected radio signal that is the transmitted radio signal reflected from an object. The at least one receiver is operable to receive an interfering radio signal transmitted by a transmitter of another radar sensing system. The processor is operable to control the at least one transmitter to selectively transmit radio signals on one of the plurality of carrier frequencies. The processor is further operable to at least one of select a carrier frequency with reduced interference and avoid interference from the other radar sensing system.