A Multiple Input Multiple Output (MIMO) radar system and method of using it for target recovery are disclosed. The MIMO radar system comprises an array of distributed radiating elements configured to transmit signals towards a target scene, an array of distributed receiving elements configured to receive signals backscattered from the target scene, a sampling module configured to sample the signals received, and a hardware processor configured to recover from the samples position parameters of one or more targets. Range, direction and optionally velocity, are estimated via simultaneous 2D or 3D sparse matrix recovery, wherein all channels defined by transmitter-receiver pairs are processed together. The digital processing may be applied either in Nyquist or sub-Nyquist scheme, reducing the number of samples, transmit and/or receive antennas. The radar system is optionally further enhanced by cognitive transmission scheme where transmitted signals are distributed over a wide frequency range with vacancy bands left therein.

This disclosure relates to systems and methods for measuring wave fields of a body of water. A system can include a radiation source and an antenna that can cooperate with the radiation source to transmit a radio frequency (RF) signal to a wave field having one or more waves. The antenna can receive backscattered signals from the wave field. The system can include a local oscillator and a processor. The local oscillator downconverts the backscattered signals into baseband signals and the processor can process the baseband signals to determine a relative velocity of each of the waves of the wave field. The processor can further be programmed to identify an observed portion of the backscattered signals as bad data and remove the bad data from further processing.

Method for measuring the flow velocity of a medium in an open channel with a radar meter, wherein a primary emission direction of the radar meter forms with a direction of a surface of the medium a first angle from 20° to 80° and with a flow direction of the medium a second angle between 0° and 80°, comprising the following steps: Sending a transmission signal with a plurality of frequency ramps, Receiving a reception signal per frequency ramp of the transmission signal, Saving the reception signals, Performing a first spectral analysis of the reception signals, Performing a second spectral analysis of several receiving signals or output signals of the first spectral analysis, Determining a flow velocity based on the phase change yielded from the output signals of the second spectral analysis in at least one distance in the distance range.

Techniques for radar detection based on preacquisition ramps are discussed. One example system comprises transmitter circuitry, receiver circuitry, and one or more processors. The transmitter circuitry can transmit preacquisition ramps and acquisition ramps. The receiver circuitry can receive preacquisition signals and acquisition signals based on interactions between the environment and the preacquisition ramps and acquisition ramps, respectively. The one or more processors can perform preprocessing based on the preacquisition signals to obtain interim results based on one or more of the environment or the system; generate a range Doppler map based at least in part on the acquisition signals; and evaluate the range Doppler map based at least in part on the interim results.

Techniques for radar detection based on preacquisition ramps are discussed. One example system comprises transmitter circuitry, receiver circuitry, and one or more processors. The transmitter circuitry can transmit preacquisition ramps and acquisition ramps. The receiver circuitry can receive preacquisition signals and acquisition signals based on interactions between the environment and the preacquisition ramps and acquisition ramps, respectively. The one or more processors can perform preprocessing based on the preacquisition signals to obtain interim results based on one or more of the environment or the system; generate a range Doppler map based at least in part on the acquisition signals; and evaluate the range Doppler map based at least in part on the interim results.

An electronic device detects an object reflecting transmitted waves based on transmitted signals transmitted as the transmitted waves from transmitting antennas and received signals received from receiving antennas as reflected waves obtained by reflection of the transmitted waves. The electronic device determines that the object have been detected when the peak in the result obtained by performing a Fourier transform process on the beat signals generated based on the transmitted and received signals is equal to or higher than a predetermined threshold value. The electronic device sets a predetermined threshold value based on an object detection probability.

A system for measuring phase coherence between two modulated radio frequency signals comprises at least two measurement receivers coupled with each other and a processing module assigned to the at least two measurement receivers. Each of the at least two measurement receivers is configured to acquire a radio frequency signal and to convert the respective radio frequency signal acquired into digital samples. The processing module is configured to receive the digital samples and to transform the digital samples into a frequency domain to obtain a respective transformed dataset assigned to each measurement receiver. The processing module is also configured to calculate a phase in dependency of the frequency from the respective transformed dataset. Moreover, the processing module is configured to determine a phase difference over frequency based on the transformed datasets. Further, a method of measuring phase coherence between two modulated radio frequency signals is described.

A system for measuring phase coherence between two modulated radio frequency signals comprises at least two measurement receivers coupled with each other and a processing module assigned to the at least two measurement receivers. Each of the at least two measurement receivers is configured to acquire a radio frequency signal and to convert the respective radio frequency signal acquired into digital samples. The processing module is configured to receive the digital samples and to transform the digital samples into a frequency domain to obtain a respective transformed dataset assigned to each measurement receiver. The processing module is also configured to calculate a phase in dependency of the frequency from the respective transformed dataset. Moreover, the processing module is configured to determine a phase difference over frequency based on the transformed datasets. Further, a method of measuring phase coherence between two modulated radio frequency signals is described.

A system and method for improving a resolution of a system may include providing to the ML module a set of input electromagnetic signals from an array included in a system; and improving, by the ML module, the resolution of the system by generating and providing at least one additional electromagnetic signal, based on the received set.

A transmission radar (1) divides each of multiple frequency bands in such a manner that differences between center frequencies in respective frequency bands after the division are equal, and transmits, in time division manner, transmission signals of which transmission frequencies are the center frequencies in respective frequency bands after the division; a rearrangement processing unit (13) rearranges each of the reception video signals converted by the reception radar (5) in such a manner that sets of reception video signals corresponding to the multiple frequency bands before being divided by the transmission radar (1) are arranged in a row; and a band synthesis processing unit (14) performs a band synthesis on each of the reception video signals rearranged by the rearrangement processing unit (13).