Illustrative methods and circuits to verify operation of phase shifters. One illustrative method includes: obtaining a first set of in-phase and quadrature components (I.sub.1,Q.sub.1) of a phase shifter output signal with a first setting; measuring a second set of components (I.sub.2,Q.sub.2) with a second setting, the second setting being offset from the first by a predetermined phase difference; and combining the first and second sets to determine whether their relationship corresponds to the predetermined phase difference. An illustrative transmitter includes: a phase shifter, an I/Q mixer, and a processing circuit. The phase shifter converts a transmit signal into an output signal having a programmable phase shift. The I/Q mixer mixes the output signal with a reference signal to obtain in-phase and quadrature components of the output signal. The processing circuit is coupled to the I/Q mixer implement the disclosed method.

Illustrative methods and circuits to verify operation of phase shifters. One illustrative method includes: obtaining a first set of in-phase and quadrature components (I.sub.1,Q.sub.1) of a phase shifter output signal with a first setting; measuring a second set of components (I.sub.2,Q.sub.2) with a second setting, the second setting being offset from the first by a predetermined phase difference; and combining the first and second sets to determine whether their relationship corresponds to the predetermined phase difference. An illustrative transmitter includes: a phase shifter, an I/Q mixer, and a processing circuit. The phase shifter converts a transmit signal into an output signal having a programmable phase shift. The I/Q mixer mixes the output signal with a reference signal to obtain in-phase and quadrature components of the output signal. The processing circuit is coupled to the I/Q mixer implement the disclosed method.

A device and method for detecting motion using an adjustable detection shell. The motion detector includes an antenna; a reception circuit configured to receive a reflected radio frequency (RF) signal via the antenna; a time gate circuit electrically connected to the reception circuit and configured to generate a control signal for the reception circuit based on a timing setpoint signal; and an electronic processor electrically connected to the reception circuit and the time gate circuit. The electronic processor is configured to receive a signal from the reception circuit indicative of motion occurring within a detection shell that is adjustable via the timing setpoint signal. The signal is based on the reflected RF signal. The electronic processor is further configured to generate a notification when the signal received from the reception circuit is indicative of motion occurring within the detection shell.

A device and method for detecting motion using an adjustable detection shell. The motion detector includes an antenna; a reception circuit configured to receive a reflected radio frequency (RF) signal via the antenna; a time gate circuit electrically connected to the reception circuit and configured to generate a control signal for the reception circuit based on a timing setpoint signal; and an electronic processor electrically connected to the reception circuit and the time gate circuit. The electronic processor is configured to receive a signal from the reception circuit indicative of motion occurring within a detection shell that is adjustable via the timing setpoint signal. The signal is based on the reflected RF signal. The electronic processor is further configured to generate a notification when the signal received from the reception circuit is indicative of motion occurring within the detection shell.

A method and apparatus for processing a constant false alarm rate (CFAR) of sensor data are disclosed. The method includes determining whether a skip condition for an averaging operation on a current frame of radar data is satisfied based on a data variation level of the current frame, skipping the averaging operation on the current frame and obtaining previous mean data of a previous frame of the radar data, in response to the skip condition being satisfied, generating current mean data by performing the averaging operation on the current frame, in response to the skip condition not being satisfied, and performing a CFAR operation on the current frame based on one of the previous mean data or the current mean data.

A radar system with transmitting circuitry to generate a frequency-modulated output that includes an up-chirp and a down-chirp. The radar system includes receiving circuitry configured to: receive radar returns from a target, calculate a first frequency difference based on the up-chirps and calculate a second frequency difference based on the down-chirps. The radar system calculates an unambiguous but coarse estimate of the Doppler frequency shift corresponding to the target radial velocity relative to the radar from the first and second frequency differences. The system also calculates a fine but ambiguous estimate of the Doppler frequency shift by using multiple chirps either from the same triangular waveform or from a separate waveform. The system calculates an unambiguous and accurate Doppler frequency shift estimate for the target by combining the unambiguous but coarse estimate of the Doppler frequency shift and the fine but ambiguous estimate of the Doppler frequency shift.

A radar system with transmitting circuitry to generate a frequency-modulated output that includes an up-chirp and a down-chirp. The radar system includes receiving circuitry configured to: receive radar returns from a target, calculate a first frequency difference based on the up-chirps and calculate a second frequency difference based on the down-chirps. The radar system calculates an unambiguous but coarse estimate of the Doppler frequency shift corresponding to the target radial velocity relative to the radar from the first and second frequency differences. The system also calculates a fine but ambiguous estimate of the Doppler frequency shift by using multiple chirps either from the same triangular waveform or from a separate waveform. The system calculates an unambiguous and accurate Doppler frequency shift estimate for the target by combining the unambiguous but coarse estimate of the Doppler frequency shift and the fine but ambiguous estimate of the Doppler frequency shift.

A vehicle, radar system of the vehicle and method of operating the vehicle. A transmit antenna transmits a radio wave and a plurality of receive antennae receive echo radio waves from an object receptive to the transmitted radio wave, wherein the echo radio waves includes short-range interference. A processor generates a plurality of radar data arrays for the return signals, wherein each radar data array represents the return signal received at a corresponding receiver antennae, estimates an amount of short-range interference present in the return signal of each radar data array, subtracts the estimate of short-range interference from each of the radar data array to obtain a plurality of clutter-free radar data arrays, and detects the object using at least the plurality of clutter-free radar data arrays. A navigation system navigates the vehicle based on the detection of the object.

A method for measuring, using a radar or sonar, the velocity with respect to the ground of a carrier moving parallel to the ground, includes the following steps: a) orienting the line of sight of the radar or sonar toward the ground; b) emitting a plurality of radar or sonar signals (P.sub.1-P.sub.N) that are directed toward the ground, and acquiring respective echo signals (E.sub.1-E.sub.N); c) processing the acquired echo signals so as to obtain, for one or more echo delay values, a corresponding Doppler spectrum; d) for the or at least one the echo delay value, determining a high cut-off frequency of the corresponding Doppler spectrum; and e) computing the velocity of the carrier with respect to the ground on the basis of the one or more high cut-off frequencies. A system allowing such a method to be implemented.

A method for measuring, using a radar or sonar, the velocity with respect to the ground of a carrier moving parallel to the ground, includes the following steps: a) orienting the line of sight of the radar or sonar toward the ground; b) emitting a plurality of radar or sonar signals (P.sub.1-P.sub.N) that are directed toward the ground, and acquiring respective echo signals (E.sub.1-E.sub.N); c) processing the acquired echo signals so as to obtain, for one or more echo delay values, a corresponding Doppler spectrum; d) for the or at least one the echo delay value, determining a high cut-off frequency of the corresponding Doppler spectrum; and e) computing the velocity of the carrier with respect to the ground on the basis of the one or more high cut-off frequencies. A system allowing such a method to be implemented.