A GPR system the implements a modified multistatic mode of operation is provided. The GPR is suitable for mounting on an unmanned aerial vehicle. The GPR system has radar transceivers. The GPR system transmits transmit signal serially via the transceivers. For each transceiver that transmits a transmit signal, the GPR system receives a return signal acquired by each transceiver except for a return signal for the transceiver that transmits the transmit signal. The GPR system outputs of matrix of return signals that includes a null value for the return signals of the transceivers that transmit.

According to an example aspect of the present invention, there is provided a method comprising, receiving, from a radar, a first reflected signal and a second reflected signal, determining a reference signal of the first reflected signal and training an artificial neural network using the first reflected signal and the reference signal of the first reflected signal, upon training, determining an output of the artificial neural network associated with the first reflected signal and providing a magnitude and angle image of the radar associated with the second reflected signal based on the output of the artificial neural network associated with the first reflected signal.

A stimulation device notably for testing radio reception devices is provided. It includes a signal generator delivering an amplitude-phase law for beam-forming purposes, transmitted in the form of a composite laser beam which illuminates a matrix of photodiodes of an emission subassembly with active modules separate from the generator, each wavelength of the beam carrying one of the signals defining the amplitude-phase law, intended for an active module. The device comprises means for measuring the orientation of the composite laser beam relative to the matrix of photodiodes of the emission subassembly and the distance traveled by the beam thereto, and correcting the phase law generated by the signal generator so as to neutralize the stray phase-shifts induced by these parameters on the signals transmitted to the emission subassembly.

A GPR system the implements a modified multistatic mode of operation is provided. The GPR is suitable for mounting on an unmanned aerial vehicle. The GPR system has radar transceivers. The GPR system transmits transmit signal serially via the transceivers. For each transceiver that transmits a transmit signal, the GPR system receives a return signal acquired by each transceiver except for a return signal for the transceiver that transmits the transmit signal. The GPR system outputs of matrix of return signals that includes a null value for the return signals of the transceivers that transmit.

A MIMO target emulation system for testing a mmWave radar sensor having multiple radar transmitters and receivers includes a coupling probe antenna array for receiving radar signals from the radar transmitters and for sending emulated target echo signals to the radar receivers; emulator receivers for down converting and digitizing the radar signals; a processing unit that decouples the digital radar signals, retrieves target parameters corresponding to emulated targets, generates emulated target echo signals corresponding to the targets in response to the decoupled digitized radar signals using the target parameters, and pre-decoupling the emulated target echo signals; and emulator transmitters for performing digital to analog conversion of the emulated target echo signals and up converting frequencies of the analog emulated target echo signals. The emulator transmitters simultaneously send the analog emulated echo target signals to the radar sensor via the antenna array to emulate target echoes responsive to the radar signals.

A signal generation system for signal simulation includes at least one data input, a pulse description word generator, a multi-frequency signal generator, and at least one radio frequency output. The multi-frequency signal generator is configured to simulate a multi-frequency global navigation satellite system signal. The pulse description word generator and the multi-frequency signal generator are assigned to the data input in order to process data received via the data input. The pulse description word generator and the multi-frequency signal generator are configured to generate an output signal based on at least one instruction for a certain generator behavior of the pulse description word generator and/or the multi-frequency signal generator. The at least one instruction is encompassed in the data received. Further, a method of signal generation is described.

A test apparatus and method for testing a semiconductor device. The semiconductor device includes an integrated circuit and a plurality of external radiating elements located at a surface of the device. The external radiating elements include at least one transmit element and receive element. The test apparatus includes a plunger. The plunger includes a dielectric portion having a surface for placing against the surface of the device. The plunger also includes at least one waveguide. Each waveguide extends through the plunger for routing electromagnetic radiation transmitted by one of the transmit elements of the device to one of the receive elements of the device. Each waveguide comprises a plurality of waveguide openings for coupling electromagnetically to corresponding radiating elements of the device. The dielectric portion is configured to provide a matched interface for the electromagnetic coupling of the waveguide openings to the plurality of external radiating elements of the device.

An electromagnetic non-line-of-sight imaging method based on time reversal and compressed sensing is provided. The electromagnetic signal passively scattered by the target behind the obstacle is received by the antenna, the contour imaging of the target is realized by using compressed sensing, the signal-to-noise ratio of the electromagnetic signal of the target is improved by using time reversal for the contour area, so as to achieve the purpose of staring at and detecting the non-line-of-sight target; a random radiation signal is transmitted for multiple times through active metasurface modulation, compressed sensing is performed for calculation imaging after receiving the signal to judge the number of targets and the contour area in the occluded area; for the target contour area, the amplitude and phase of signals obtained at different positions are adjusted by the active metasurface, so as to focus and scan the electromagnetic signals at different positions behind the obstacle. The method can detect the target in the unsealed scene behind the wall and the metal structure (3) which cannot be penetrated by electromagnetic signals, and expand the detection capability of the traditional detection and imaging radar.

A transposed delay line oscillator including a mode selection filter and a transposed delay line is provided. An output of the transposed delay line is coupled to an input of the mode selection filter to establish an oscillator loop. Based on the transposed delay line output, the mode selection filter generates a mode selection signal including an isolated oscillatory mode, in a Radio Frequency (RF) band. The transposed delay line receives the mode selection signal for transposition to an intermediate frequency of an intermediate frequency (IF) delay line. The IF delay line includes a delay filter and a phase noise suppression loop configured to suppress de-correlated transposition phase noise resulting from a delay of the delay filter. Suppression of phase noise in the IF delay line enables cancellation of transposition phase noise when transposing the IF delay line output to the RF band.

A method of estimating a radar cross section of a target in an environment using a detection device, wherein the detection device is configured to transmit transmission signals into a field of view and to receive reception signals, may include: generating a calibration curve that provides signal amplitude values as a function of positions in the field of view; detecting a reception signal, obtaining a corresponding detection profile, and analyzing the detection profile to identify the target, having a target signal amplitude and a target position corresponding thereto; and estimating the radar cross section of the target by comparing the target signal amplitude with a signal amplitude base value, provided by the calibration curve at the target position. The generating of the calibration curve may include: generating a combined profile as a function of position; and optionally, generating a filtered profile by applying a filter to the combined profile.