A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.

A device for the radio stimulation of an antenna includes at least one transmission sub-assembly formed by an array of radiating elements and an array of photoelectric receivers; as well as a generator that synthesizes a set of electrical signals that are intended to excite each radiating element. The electrical signals are transmitted to the transmission sub-assembly in the form of modulated light waves that are multiplexed to form a composite laser beam that illuminates the array of photoelectric receivers. Each of the photoelectric receivers receives a light wave. The array of photoelectric sensors and the array of radiating elements have substantially identical arrangements. Each photoelectric receiver is connected to a radiating element in its array at a position identical to the one that said receiver occupies within its own or a position symmetrical thereto.

A soft body system adapted to form the body and exterior surface of a Guided Soft Target for testing crash avoidance technologies in a subject vehicle is disclosed. The soft body system is adapted to be mounted atop a motorized Dynamic Motion Element (DME) and when so mounted is adapted to collide with the subject vehicle while the DME is moving. The soft body system includes a semi-rigid form with an exterior surface. The form is sufficiently yielding so as to impart a minimal force to the subject vehicle upon impact. The form may be shaped like a vehicle or a part of a vehicle. The exterior surface includes a side skirt made of radar absorptive material (RAM), radar reflective material (RRM) or a combination of both, which is positioned adjacent to the ground and constructed to prevent radar wave from entering the soft body system.

Systems and methods are provided for generating a radar model for a target object. In embodiments, a target simulation model is received that represents one or more physical aspects of a target object, an environment simulation model is received that represents one or more physical aspects of an environment object, and a target distance parameter is received that identifies a reference distance between the target object and a radar system to be simulated. A simulation model is generated based, at least in part, on the target simulation model, the environment simulation model, and the reference distance, and further based on a target aspect angle that identifies an angular position of the target object in relation to the radar system. Interaction of the radar system with the target object and the environment object is simulated using the simulation model, and results of the simulation are used to generate a range profile for the target object at the target aspect angle, wherein the range profile identifies a radar return strength for the reference distance. The target aspect angle is then incremented, and the operations are repeated until range profiles are generated for the target object at a plurality of target angles amounting to a 360 degree rotation of the target object. The range profiles at the plurality of target angles are then accumulated to generate the radar model for the target object.

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.

The present invention relates to an apparatus and a method for converting a radar signal for further signal processing in a test bench with a radar target emulator as well as a test bench having such an apparatus. A divider assembly preferably comprises a divider device configured to reduce a frequency and a bandwidth of the radar signal by a first factor for the further signal processing. A multiplier assembly preferably comprises a multiplier device configured to increase a frequency and a bandwidth of the radar signal by the first factor subsequent the further signal processing.

An assembly is configured for connection to an unmanned aerial vehicle (UAV) and comprises a plurality of emulator devices each configured for attachment to the UAV and a plurality of first connection tethers each configured to operably couple a respective one of the plurality of emulator devices to the UAV at a respective spacing from the UAV. The emulator devices each comprise an emulation component configured to provide, to a target detection system, a characteristic associated with a respective type of airborne object. The plurality of respective first connection tethers each comprises material that does not substantially reflect RF energy. During flight of the UAV, when the assembly is connected, each respective emulator device maintains the respective spacing from the UAV and emulates the characteristic to the target detection system, such that the assembly emulates, to the target detection system, a plurality of airborne objects.

A system for infrastructure system calibration includes a sensor configured to be mounted to an infrastructure component and configured to detect an object. A corner reflector has an optical pattern and is arranged within a field of view of the sensor. The corner reflector has three surfaces that meet at a point.

Systems, methods, tangible non-transitory computer-readable media, and devices associated with radar validation and calibration are provided. For example, target positions for targets can be determined based on imaging devices. The targets can be located at respective predetermined positions relative to the imaging devices. Radar detections of the targets can be generated based on radar devices. The radar devices can be located at a predetermined position relative to the imaging devices. Filtered radar detections can be generated based on performance of filtering operations on the radar detections. A detection error can be determined for the radar devices based on calibration operations performed using the filtered radar detections and the target positions determined based on the one or more imaging devices. Furthermore, the radar devices can be calibrated based on the detection error.

A radar detection system can be calibrated by a method which includes selecting location indicators with corresponding locations. A transmitter of a sensor emits a radar signal to the location of each of the location indicators. The radar signal is reflected off of a target at the location of each of the location indicators. The radar signal which has been reflected off of the target is received with a receiver of the sensor. The location of the target at each of the location indicators is communicated between the sensor and a controller. Locations which define a protected region are selected with the controller. The controller designates the protected region, thereby calibrating the radar detection system such that the radar detection system is capable of detecting an object in the protected region. The calibrated radar detection system can detect targets in an operational mode.