A method for determining angular orientation of an object in two or more directions. The method includes: generating a scanning polarized RF source signal; receiving the scanning polarized RF source signal at one or more cavities of a sensor disposed on the object; measuring the scanning polarized RF source signal at a first portion of the sensor; reflecting the scanning polarized RF source signal toward a second portion of the sensor; measuring the scanning polarized RF source signal at the second portion of the sensor; and determining the angular orientation of the object in the two or more directions based on the measured signal at the first and second portions of the sensor.

A millimeter or mm-wave system includes transmission of a millimeter wave (mm-wave) radar signal by a transmitter to an object. The transmitted mm-wave radar signal may include at least two signal orientations, and in response to each signal orientation, the object reflects corresponding signal reflections. The signal reflections are detected and a determination is made as to location of the object.

A radar sensor for a motor vehicle, in particular a passenger car, is disclosed. The radar sensor has a control unit, an antenna arrangement, and a reflector device for reflecting transmitted radar signals from the antenna arrangement into a measurement region and radar signals, which are to be received by the antenna arrangement from the measurement region. The reflector device has a parabolic reflector. The control unit is designed to change the measurement region by changing the radiation characteristic and/or the reception characteristic, in particular by beamsteering and/or beamforming, during control of the antenna arrangement such that various reflection regions of the reflector device that correspond to different measuring regions are used.

A high-frequency detection system (100) such as a terahertz camera is disclosed which includes a first detector array (102), a second detector array (104), and a polarizing plate (106). The polarizing plate is interposed between the detector arrays such that it passes and/or reflects radiation signals (110) from a source (108) to the detector arrays. A first radiation signal (112) having a first polarization is passed through the polarizing plate to the first detector array, and a second radiation signal (114) having a second polarization is reflected from the polarizing plate to the second detector array. Both radiation signals are from source (108), which can be one or more human beings emitting radiation towards the detection system. In some embodiments, the detector arrays (102, (104) may be joined. Each of the detector arrays comprises one or more input channels, such as feedhorns (116, 118, 120) which capture radiation from source (108) and pass the received signal into other portions of the system for subsequent processing. Input channels and local oscillator channels are aligned to one axis, and output channels are aligned to an axis perpendicular thereto. The system may further include a scanning mechanism (126). The detection systems described herein can use a heterodyne mixer. For instance, the array of feedhorns deliver incoming radiation via waveguides to a diode-based mixer with an intermediate frequency output to processing circuitry. System (100) can be used for the detection and identification of weapons, threats, illicit goods, and stolen items.

Method and device for radar transmission and reception by dynamic change of polarization notably for the implementation of interleaved radar modes are provided. A radar transmission-reception method and a device for implementing this method, the method alternatively implementing two modes of operation, a short range mode exploiting short pulses and a long range mode exploiting modulated long pulses, the method consisting, for each mode, in: producing two synchronous radiofrequency (RF) transmission signals having between them a phase-shift θ of controllable given value; radiating two radiofrequency waves, each corresponding to one of the transmission RF signals produced, by means of two colocated radiating sources each having a given polarization axis; handling the reception of the backscattered radiofrequency signals picked up by each of the radiating sources, and delivering two radiofrequency (RF) reception signals each corresponding to a radiofrequency signal picked up by one of the radiating sources, a phase-shift θ′ being applied between the two signals delivered, θ′ being able to be determined as being equal to θ.

Example embodiments describe a method for estimating a number of persons present in a room including i) obtaining measurements of electromagnetic sounding signals transmitted within the room; ii) determining at least one reverberation time from the measurements; iii) determining the number of people in the room based on the at least one reverberation time, on a room parameter indicative for a capacity of the room for absorbing the signals and a person parameter indicative for an average capacity of a person for absorbing the signals.

A method for confusing the electronic signature of a signal transmitted by a radar, includes the generation by the radar of at least one pulse, wherein the method comprises a step of modulation, in the pulse, of the polarization of the transmitted signal, according to two orthogonal or opposite polarizations, the modulation of the polarization being performed according to a predetermined modulation code.

An antenna system for a mobile communications base station and a method of operating a communications network including a base station is described. The antenna system includes an antenna array for beamforming and is configured either as a radar sensor, a communications antenna or a combined radar sensor. A radar image may be used to determine a map of objects in the vicinity of the antenna system and to adapt the beamsteering or beamforming of the antenna system.

A method is provided for radar ranging using an IR-UWB radar transceiver. The range is determined by measuring a time required by a transmitted pulse to be reflected by an object and returned to the transceiver. The method includes transmitting a ranging signal having a predetermined sequence of positive and negative pulses using a transmitter of the transceiver. A receiver of the transceiver receives a signal having a reflected portion and a feedthrough portion. In the method, the receiver cancels the feedthrough portion using a delayed pulse polarity signal such that when the delayed pulse polarity signal is multiplied and accumulated with the received signal, the feedthrough portion is canceled, and the reflected portion is amplified. In another embodiment, a transceiver is provided that cancels the feedthrough portion while amplifying the reflected portion. Cancelling the feedthrough portion allows short-range operation by removing a blind range of the transceiver.

The present disclosure relates to a radar apparatus and a method for processing a signal using a radar apparatus, and more particularly, to an apparatus and a method for receiving and processing reception signals having different polarization characteristics using one array antenna. Specifically, the present disclosure provides a radar apparatus including: a long-range transmission antenna unit including one or more long-range transmission array antennae which transmit a first polarized transmission signal; a short-range transmission antenna unit including one or more short-range transmission array antennae which transmit a second polarized transmission signal; a complex array antenna unit which includes one or more complex array antennae receiving a first polarized reception signal and a second polarized reception signal which are received by reflecting the first polarized transmission signal and the second polarized transmission signal from a target; and a signal processing unit which detects the target using the first polarized reception signal and the second polarized reception signal, in which the first polarized reception signal has a cross polarization characteristic with respect to the second polarized reception signal, and a radar signal processing method.