A radar sensing system for a vehicle includes a transmitter configured for installation and use on a vehicle and able to transmit radio signals. The radar sensing system also includes a receiver and a processor. The receiver is configured for installation and use on the vehicle and able to receive radio signals. The received radio signals include transmitted radio signals that are reflected from objects in the environment. The received radio signals further include radio signals transmitted by at least one other radar system. The processor samples the received radio signals to produce a sampled stream. The processor is configured to control an adaptive filter. Responsive to the processor, the adaptive filter is configured to filter the sampled stream, such that the radio signals transmitted by the at least one other radar system are removed from the received radio signals.

A radar system processes signals in a flexible, adaptive manner to determine range, Doppler (velocity) and angle of objects in an environment. The radar system processes the received signal to achieve different objectives depending on the environment, the current information stored in the radar system, and/or external information provided to the radar system. The system allows improved resolution of range, Doppler and/or angle depending on the desired objective.

A signal processing device includes: an amplitude reducing unit to reduce, when a phase shift control signal indicating a phase shift of a transmission wave whose frequency is modulated is output, among amplitudes of a beat signal having a difference frequency between the transmission wave and a reception wave, an amplitude of the beat signal at a timing at which a phase of the transmission wave is shifted in accordance with the phase shift control signal; and a signal converting unit to convert the beat signal whose amplitude at the timing at which the phase of the transmission wave is shifted is reduced by the amplitude reducing unit into a signal in a frequency domain.

A radar sensing system includes at least one transmitter, at least one receiver and a processor. The at least one transmitter transmits a power shaped RF signal. The transmitted RF signal decreases in power over time. The at least one receiver receives a reflected RF signal. The reflected RF signal is the transmitted RF signal reflected from targets in the environment. The reflected RF signal is down-converted and the result provided to the processor. The processor samples the down-converted reflected RF signal during a plurality of time intervals to produce a sampled stream. The different time intervals of the plurality of time intervals will contain different signal levels of RF signals reflected from the targets. The processor also selects samples in the sampled stream over a selected time interval of the plurality of time intervals that is free of RF signals reflected off of near targets.

Methods, systems, and devices for wireless communications are described. A user equipment (UE), such as a vehicle UE may determine, based on one or more communication parameters of the UE, a radar field of view (FOV) for radar communications at the UE relative to a fixed frame of reference for the wireless communications system. The UE may determine a set of radar transmission parameters based on the radar FOV, where each radar transmission parameter of the set of radar transmission parameters is a function of the radar FOV. The UE may transmit a radar message using the set of radar transmission parameters according to the radar FOV relative to the fixed frame of reference.

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.

Methods and apparatuses pertaining to radar interference mitigation are described. A processor associated with an apparatus may generate a plurality of wave frames such that one or more aspects of the plurality of wave frames vary from one wave frame to another wave frame of the plurality of wave frames. Each of the plurality of wave frames may respectively include a plurality of chirps. A wireless transmitter associated with the apparatus may transmit the plurality of wave frames. A wireless receiver associated with the apparatus may receive one or more reflected waves comprising at least a portion of one or more of the wave frames reflected by an object. The processor may determine a distance between the object and the apparatus, a speed of the objet, or both, based on an analysis of the one or more reflected waves.

An orthogonal separation device of the invention includes a demodulator that performs a demodulation process corresponding to each of a plural number N of antennas for each of a plural number P (=M×N) of pulse waves (R11 to R1M), . . . , (RN1 to RNM) which arrives at the plural number N of antennas by transmitting, at the same time, a plural number M of pulse waves having phases φ.sub.1 to φ.sub.M set as different arrays of known discrete values and that generates a plural number P of demodulated signals (R′.sub.11 to (R′.sub.1M), . . . (R′.sub.N1 to .sub.R′NM), and includes a phase adjuster that adjusts difference among the phases of a plural number P of demodulated signals (R′.sub.11 to R′.sub.1M), . . . , (R′.sub.11 to R′.sub.NM) according to the arrays of known discrete values and generates a plural number P of in-phase signals (r11 to r1M), . . . , (rN1 to rNM).

A system for radar interference mitigation, preferably including one or more transmitter arrays, receiver arrays, and/or signal processors, and optionally including one or more velocity sensing modules. A method for radar interference mitigation, preferably including transmitting a set of probe signals, receiving a set of reflected probe signals, and/or evaluating interference, and optionally including decoding the set of received probe signals and/or compensating for interference.

There is described a method of determining phase error caused by impairments in a phase rotator, said impairments including leakage in mixers and/or multipliers of the phase rotator, gain/amplitude imbalance and a known phase imbalance between an I path and a Q path in the phase rotator, the phase rotator having an input for receiving a reference phase value, a local oscillator and circuitry configured to provide an output signal with a phase corresponding to the reference phase value. The method comprises (a) forcing the Q path of the phase rotator to zero and obtaining a first sequence of successive measurement values indicative of a power of the phase rotator output signal, each successive measurement value in the first sequence corresponding to one of a plurality of successive reference phase values, (b) forcing the I path of the phase rotator to zero and obtaining a second sequence of successive measurement values indicative of the power of the phase rotator output signal, each successive measurement value in the second sequence corresponding to one of the plurality of successive reference phase values, (c) forming a sequence of successive measurement value pairs, each measurement value pair comprising one measurement value from the first sequence of successive measurement values and one measurement value from the second sequence of successive measurement values, wherein the first sequence of successive measurement values is shifted relative to the second sequence of successive measurement values by an amount corresponding to the known phase imbalance, (d) calculating an actual phase value for each of the successive measurement value pairs, and (e) determining the phase error by comparing the actual phase values with the corresponding reference phase values. Furthermore, a corresponding device and a radar system comprising such a device are described.