A disclosed radio frequency (RF) system, such as a cognitive radar, includes a software defined radio (SDR), an adaptive transmit amplifier, and a host computer. The system performs optimization operations including selecting an initial impedance as a load impedance for the RF device and iteratively performing image completion operations until a convergence criterion is satisfied. The image completion operations may include measuring a performance of the RF device to obtain a measured performance corresponding to the load impedance, storing the measured performance as a point on a measured load-pull contour image, performing a load-pull extrapolation to extrapolate, from the load impedance, a predicted optimal impedance, and saving the predicted impedance as the load impedance for a next iteration of the image completion operations. The convergence criterion may be satisfied when a predicted impedance matches one of the previously measured impedances.

A phase correcting device includes a local oscillator that includes an all digital phase-locked loop configured to output a local oscillation signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.

In an embodiment, a method for testing a millimeter-wave radar module includes: providing power to the millimeter-wave radar module; performing a plurality of tests indicative of a performance level of the millimeter-wave radar module; comparing respective results from the plurality of tests with corresponding test limits; and generating a flag when a result from a test of the plurality of test is outside the corresponding test limits, where performing the plurality of tests includes: transmitting a signal with a transmitting antenna coupled to a millimeter-wave radar sensor, modulating the transmitted signal with a test signal, and capturing first data from a first receiving antenna using an analog-to-digital converter of the millimeter-wave radar sensor, where generating the flag includes generating the flag based on the captured first data.

A distributed radar includes a control unit, a receive antenna, and N transmit antennas. The N transmit antennas include a first transmit antenna, a second transmit antenna, and a third transmit antenna. There is a first distance (Δx1) between the first transmit antenna and the second transmit antenna, there is a second distance (Δx2) between the first transmit antenna (201) and the third transmit antenna (203), and Δx1 is less than Δx2. The second transmit antenna is connected to the control unit by using a first cable (L1), the third transmit antenna is connected to the control unit by using a second cable (L2), a ratio of Δx1 to Δx2 is a first ratio, a ratio of a length of L1 to a length of L2 is a second ratio, and the second ratio is greater than the first ratio.

Machine learning network trained to tune settings and optimize images. In accordance with one aspect, a method is provided for image optimization with a medical ultrasound scanner. A medical ultrasound scanner images a patient using first settings. A first image from the imaging using the first settings and patient information for the patient are input to a machine-learned network. The machine-learned network outputs second settings in response to the inputting of the first image and the patient information. The medical ultrasound scanner re-images the patient using the second settings. A second image from the re-imaging is displayed.

A radar device includes a transmission unit that transmits an FMCW signal, a reception unit that receives the FMCW signal which is transmitted by the transmission unit and reflected by an object, a measurement unit that measures a spurious of the FMCW signal, and a signal control unit that controls the FMCW signal transmitted by the transmission unit on the basis of a measurement result of the measurement unit.

A radar sensor system having at least one transmitter device, all transmitter devices having a total of at least two transmit channels; and at least one receiver device, with all receiver devices having a total of at least two receive channels; a temperature sensor in each case for sensing the temperatures of the at least one transmitter device and the at least one receiver device, a modeling device for modeling at least one temperature dependency of the at least one transmitter device from the at least one receiver device; and a compensation device for compensating for the modeled temperature dependency.

The techniques of this disclosure describe a scalable cascading automotive radar system that generates a common oscillator signal enabling consecutive chirps to be output more quickly and precisely than any previous cascading automotive radar system, thereby reducing phase noise and improving performance. The scalable cascading automotive radar system combines a respective LO signal output from at least two primary transceivers to distribute the combined signals as a common oscillator signal to be input to all the transceivers of the radar system. Thus, settling time and resetting times that otherwise occur between chirps generated by other automotive radar systems are reduced because the common oscillator signal is no longer constrained to a single LO signal from a single primary transceiver.

In accordance with a first aspect of the present disclosure, a system is provided for facilitating detecting an external object, the system comprising: at least one radar device configured to transmit one or more radar signals; a controller configured to control said radar device; wherein the controller is configured to cause the radar device to operate in a first mode in which the radar device transmits a first radar signal for determining one or more communication channel characteristics; wherein the controller is further configured to cause the radar device to operate in a second mode in which the radar device transmits a second radar signal, wherein one or more properties of the second radar signal are based on the communication channel characteristics determined when the radar device operates in the first mode. In accordance with a second aspect of the present disclosure, a corresponding method is conceived for facilitating detecting an external object. In accordance with a third aspect of the present disclosure, a computer program is provided for performing said method.

A radar apparatus includes a radar transmission circuit that transmits a radar signal from a transmission array antenna, and a radar reception circuit that receives, from a reception array antenna, a reflected wave signal that is the radar signal reflected at a target. One of the transmission array antenna and the reception array antenna includes a first antenna element group having m antenna elements arranged at a first interval D.sub.t along a first axis direction, wherein m is an integer of 2 or larger. The other one of the transmission array antenna and the reception array antenna includes a second antenna element group having n antenna elements arranged at a second interval D.sub.r along the first axis direction, wherein n is an integer of 4 or larger. The second interval D.sub.r includes several different intervals.