A wireless transmission device transmits a radio signal with a plurality of beam patterns and outputs transmission beam identifiers corresponding to the beam patterns to an object detection device, a wireless reception device receives the radio signal transmitted by the wireless transmission device with a plurality of beam patterns, measures received signal strength for each of the beam patterns and outputs reception beam identifiers and the received signal strength to the object detection device, and the object detection device detects an object within a detection area on the basis of the transmission beam identifiers, the reception beam identifiers and the received signal strength. This enables device-free object detection by utilizing a beamforming function, so that it is possible to achieve high detection accuracy while preventing increase in cost.

A wireless transmission device transmits a radio signal with a plurality of beam patterns and outputs transmission beam identifiers corresponding to the beam patterns to an object detection device, a wireless reception device receives the radio signal transmitted by the wireless transmission device with a plurality of beam patterns, measures received signal strength for each of the beam patterns and outputs reception beam identifiers and the received signal strength to the object detection device, and the object detection device detects an object within a detection area on the basis of the transmission beam identifiers, the reception beam identifiers and the received signal strength. This enables device-free object detection by utilizing a beamforming function, so that it is possible to achieve high detection accuracy while preventing increase in cost.

A distributed directional aperture (DDA) system provides the capability to receive and/or transmit signals, limiting that reception or transmission to a 3-dimensional beam. The DDA system includes sensing and/or emitting array subsystems which comprise sensors and/or emitters distributed across, within, or under the skin of an aircraft, ship, ground vehicle, or fixed installation. The sensors receive energy, convert the received signals to digital information, and transmit that information via a telemetry subsystem to a beamformer subsystem. The beamformer subsystem analyzes the received signals from the sensors and/or emitters in order to determine the signal content from a specific direction. The emitters transmit energy, converting signals received from the beamformer subsystem via the telemetry subsystem into energy emissions. Methods of providing the DDA system including subsystems thereof are also disclosed.

An angularly resolving radar sensor having multiple antenna elements that, in a direction in which the radar sensor is angularly resolving, are disposed in different positions, and having a control and evaluation device that is designed for an operating mode in which several of the antenna elements transmit signals that are respectively received by several of the antenna elements, and the angle (θ) of a located object is identified on the basis of amplitudes and/or phase relationships between signals which correspond to different configurations of transmitting and receiving antenna elements, wherein the control and evaluation device is embodied to supply several of the transmitting antenna elements simultaneously with identical-frequency signals (f.sub.1-f.sub.4) in such a way that the common phase center of said signals is located between the positions of two adjacent antenna elements.

An angularly resolving radar sensor having multiple antenna elements that, in a direction in which the radar sensor is angularly resolving, are disposed in different positions, and having a control and evaluation device that is designed for an operating mode in which several of the antenna elements transmit signals that are respectively received by several of the antenna elements, and the angle (θ) of a located object is identified on the basis of amplitudes and/or phase relationships between signals which correspond to different configurations of transmitting and receiving antenna elements, wherein the control and evaluation device is embodied to supply several of the transmitting antenna elements simultaneously with identical-frequency signals (f.sub.1-f.sub.4) in such a way that the common phase center of said signals is located between the positions of two adjacent antenna elements.

Device-free localization for smart indoor environments within an indoor area covered by wireless networks is detected using active off-the-shelf-devices would be beneficial in a wide range of applications. By exploiting existing wireless communication signals and machine learning techniques in order to automatically detect entrance into the area, and track the location of a moving subject within the sensing area a low cost robust long-term tracking system can be established. A machine learning component is established to minimize the need for user annotation and overcome temporal instabilities via a semi-supervised framework. After establishing a robust base learner mapping wireless signals to different physical locations from a small amount of labeled data; during its lifetime, the learner automatically re-trains when the uncertainty level rises significantly. Additionally, an automatic change-point detection process is employed setting a query for updating the outdated model and the decision boundaries.

A multi-channel radar method is provided for carrying out a transmission by at least two channels, in which at least one channel is provided with a frequency detuning by at least one respective switch for switching a signal amplitude and/or signal phase of the channel.

A multi-channel radar method is provided for carrying out a transmission by at least two channels, in which at least one channel is provided with a frequency detuning by at least one respective switch for switching a signal amplitude and/or signal phase of the channel.

Embodiments are generally directed to determination of mobile display position and orientation using micropower impulse radar. An embodiment of an apparatus includes a display to present images; radar components to generate radar signal pulses and to generate distance data based on received return signals; radar antennae to transmit the radar signal pulses and to receive the return signals; and a processor to process signals and data, wherein the processor is to: process the return signals received by the radar antennae to determine a position and orientation of the display with respect to real objects in an environment and to determine a position of a vantage point of a user of the apparatus, and generate an augmented image including rendering a virtual object and superimposing the virtual object on an image including one or more real objects, the rendering of the virtual image being based at least in part on the determined position and orientation of the display and the determined vantage point of the user of the apparatus.

Embodiments are generally directed to determination of mobile display position and orientation using micropower impulse radar. An embodiment of an apparatus includes a display to present images; radar components to generate radar signal pulses and to generate distance data based on received return signals; radar antennae to transmit the radar signal pulses and to receive the return signals; and a processor to process signals and data, wherein the processor is to: process the return signals received by the radar antennae to determine a position and orientation of the display with respect to real objects in an environment and to determine a position of a vantage point of a user of the apparatus, and generate an augmented image including rendering a virtual object and superimposing the virtual object on an image including one or more real objects, the rendering of the virtual image being based at least in part on the determined position and orientation of the display and the determined vantage point of the user of the apparatus.