Apparatus for detecting misalignment of a radar unit (2; 22) of a vehicle (3; 23), the apparatus comprising: a magnet (1; 21), which may be a permanent magnet or an electromagnet, arranged to be mounted on the vehicle (3; 23) spaced from the radar unit (2; 22); a magnetic field sensor (4; 24), typically a three-axis magnetic field sensor, such as a Hall Effect Sensor, arranged to be coupled to the radar unit (2; 22) and having an output at which a signal indicative of the magnetic field at the magnetic field sensor (4; 24); and a processor (5; 25) coupled to the output and arranged to determine a misalignment of the radar unit (2; 22) based on the output of the magnetic field sensor (4; 24). Where the magnet is an electromagnet (21), the field strength of the electromagnet (21) can be varied by its drive circuit (30).

There is provided a detection device calibration method including: attaching a first reflector to a side surface of a vehicle such that a reflection surface of the first reflector is perpendicular to a vehicle width direction; adjusting a direction of a laser marker such that a first laser beam of the laser marker is emitted perpendicularly to the reflection surface of the first reflector; adjusting a direction of a second reflector disposed in front of or behind the vehicle such that a second laser beam of the laser marker is emitted perpendicularly to a reflection surface of the second reflector, the second laser beam being emitted in a vehicle length direction; emitting a detection wave from a detection device provided in the vehicle to the second reflector; and calibrating a transmission direction of the detection wave based on a detection result of a reflected wave.

A signal processing device, includes: an azimuth estimation unit configured to estimate an arrival azimuth of a radio wave based on a reception signal of plural antennas; an estimated reception signal calculation unit configured to calculate an estimated reception signal based on an estimation result of the arrival azimuth, for comparison with the reception signal; a residual signal calculation unit configured to calculate a residual signal which is a difference between the reception signal and the estimated reception signal; and a determination unit configured to determine whether the estimation result of the arrival azimuth is correct based on the residual signal.

Systems and methods for calibrating a radar sensor based upon synthetic aperture radar (SAR) principles are described herein. A relative motion is induced between a radar sensor and a calibration target in the field-of-view of the radar sensor. The radar sensor receives returns from the calibration target. The radar sensor outputs, based upon the relative motion between the radar sensor and the calibration target, detections that are indicative of locations of points on the calibration target. A computing system generates calibration data based upon the detections, the calibration data comprising a correction factor between a position measured by the radar sensor and a corresponding true position of an object. The computing system programs the radar sensor based on the calibration data such that subsequent to being programmed, the radar sensor outputs detections based upon radar returns and the calibration data.

Provided herein are: multiple object detection units each serving to detect positional information about detection targets; a stationary object extraction unit for extracting, from positional information detected by two object detection units in the multiple object detection units about their respective sets of detection targets, positional information about multiple detection targets that are common between the respective sets of detection targets; and an axial deviation determination unit for making a comparison between the positional information detected by an object detection unit in the object detection units about the detection targets, and the positional information detected, after detection about the detection targets by the object detection unit, by the other detection unit about the detection targets, to thereby determine presence/absence of an axial deviation of a central axis of the object detection unit or the other object detection unit. According to this configuration, an axial deviation amount is detected.

A radar system (2) for a vehicle (1), having a radar transceiver (3) and a control unit (4), where the control unit (4) is adapted to control the radar transceiver to apply an initial signal power level (P.sub.i) for transmitted radar signals (5); and to receive reflected radar signals (6) that have been reflected by at least one object (7). The control unit (4) is further adapted to determine a total signal reduction level (L) for which at least one predetermined criterion is not met; to compare the total signal reduction level (L) to a threshold; and to determine whether the radar transceiver (3) is working in an acceptable manner or not in dependence of the comparison.

A method is provided for calibrating a radar sensor. According to the method, a plurality of radar detections is acquired via the radar sensor, and an angle of arrival is determined for each of the radar detections. Equidistant bins of an electric angle are defined which are related to the angle of arrival, and the radar detections are assigned to the equidistant bins of the electric angle. Based on the assignment, a reconstructed array manifold is determined for calibrating the radar sensor.

A sensor holder for a sensor for object detection includes: an installation unit for the sensor; a holding frame on which the installation unit is pivotably held; and an adjustment shaft mounted on the holding frame, the adjustment shaft having a guidance contour which proceeds helically around the adjustment shaft and is in engagement with a guidance element of the installation unit.

Provided herein is a system on a vehicle, the system comprising an active Doppler sensor; one or more processors; and a memory storing instructions that, when executed by the one or more processors, causes the system to perform: obtaining a Doppler signature from each of one or more entities; and determining one or more calibration parameters of the active Doppler sensor based on the Doppler signature from at least a portion of the one or more entities.

A method for controlling the function of a vehicle radar transceiver (3), where the method includes transmitting (S100) a radar signal (5) and collecting and storing (S300) target data comprising a received detected signal level obtained from the reflected radar signals (6) that have been reflected by at least one target object (7) during a measurement angular interval (21). The method further includes determining (S400) that the radar transceiver (3) is functioning properly when at least one of the following conditions is met: the detected signal level exceeds a minimum signal level (12) during an angular interval (θ.sub.i) included in a measurement angular interval (21); and a detected signal level change for a certain angular change falls below a certain limit during an angular interval (θ.sub.i) included in the measurement angular interval (21).