The present invention relates to a multi-stage control system comprising at least one control device at a first location and at least a follow-up control point at a second location with a follow-up control device. The control device according to the invention comprises for the automatic inspection of a person with respect to hidden objects an inspection device for contactless inspection of the person. Said control device is configured to determine a follow-up control area of the person, to store data defining the follow-up control area in a data set, to generate a unique identification feature for the person on the basis of a detected external feature of the person, and to allocate the person to the data set. The follow-up control device comprises a display device for displaying a graphical representative of a person, wherein the display device is designed to display a follow-up control area of the person in a visually recognizable manner for finding hidden objects in accordance with a data set allocated to the person. The follow-up control device can be configured to generate the unique identification feature for the person on the basis of a detected feature of the person. Alternatively, the follow-up control device can be designed to display an identification feature, in particular a recording, more particularly a recording of the facial view of the person, which is allocated to the data set of a follow-up control area at another control point, for visual verification whether the data set is associated with the person. The invention further relates to a corresponding control method, to a corresponding follow-up control method and to a corresponding multi-stage control method.

Systems and methods are described, and one system includes a three-dimensional (3D) geometric tracker connected to a multiband (MB) inverse synthetic aperture array radar (ISAR), and a classification/alarm logic. The MB ISAR includes spatially distributed radar transmitters (TXs) and receivers (RXs), a TX/RX allocation logic, and a tomographic (TM) image logic. The TX/RX allocation logic is configured to receive 3D tracking data from the 3D geometric tracker, indicating subject 3D position and 3D orientation and, in response, dynamically allocate TXs and RXs to maintain MB illumination of and maintain MB reception of multiple scatter angles from subjects. The TM image processor is configured to construct TM images from the scatter angles, using 3D tracking data, for input to the classification and alarm logic. Optionally, the TX/RX resource allocation logic is configured to receive situation feedback data, for feedback adjusting of allocation of TXs and RXs.

An electromagnetic wave imaging method, system, and apparatus are provided. The method includes collecting an electromagnetic echo signal, where the electromagnetic echo signal is used to indicate electromagnetic wave scattering feature information of a target object, obtaining location information of a reception point of the electromagnetic echo signal, where the location information indicates relative location information between the reception point and a positioning label, and performing electromagnetic wave imaging on the target object based on the electromagnetic wave scattering feature information and the location informati

An efficient RADAR imaging method that is able to detect an object within an interested area. This method uses electromagnetic waves transmitted by one or many transmitters to illuminate the interested area, and then estimates the phase shift of the scattered wave of an object according to the path that the electromagnetic wave propagated. By reversing the phase of the obtained scattered signal to the transmitters' position, an image is constructed for the entire interested area according to the correlation of signals in all channels. The present method works in the frequency domain. It produces a microwave image by using the phase and magnitude of the obtained signal, or using the phase information only. Other unique features include the way it synthesizes the signals obtained in multiple channels and at multiple frequencies. Its overwhelming high efficiency makes rapid microwave imaging and real-time imaging possible.

An array of scattering and/or reflector antennas are configured to produce a series of beam patterns, where in some embodiments the scattering antenna and/or the reflector antenna includes complementary metamaterial elements. In some embodiments circuitry may be configured to set a series of conditions corresponding to the array to produce the series of beam patterns, and to produce an image of an object that is illuminated by the series of beam patterns.

The present invention relates to a detector device for detection of unauthorised objects or substances, comprising a support base (110) designed to receive at least one foot covered by its shoe, of an individual to be controlled, characterised in that it comprises in combination microwave sender/receiver means (140), measuring means (150) of the width of an element inserted in between the microwave sender/receiver means (140), analysis means of at least one parameter of the transmission time between the microwave sender/receiver means (140) and/or the amplitude of the signal transmitted between the microwave sender/receiver means (140), and standardisation means of the abovementioned analysis relative to a size unit of standard width obtained on the basis of the width-measuring means (150).

According to one embodiment, an electronic apparatus comprises antenna elements and processor circuitry. The antenna elements are arranged respectively at least at first, second, third, and fourth positions. The first and second positions are arranged in a first direction. Spacing between the first positions and spacing between the second positions are coprime. The third and fourth positions are arranged in a second direction. Spacing between the third positions and spacing between the fourth positions are coprime.

A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a first frequency range using frequency steps of a first step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing from the first step size to a second step size, wherein the second step size is different from the first step size, and performing stepped frequency scanning across a second frequency range using the at least one transmit antenna and the two-dimensional array of receive antennas and using frequency steps of the second step size.

Data is received characterizing a plurality of measurements for a scene received by a plurality of sensor elements forming a sensor array. A plurality of scene sub-domains is mapped to the plurality of sensor elements. A plurality of voxels associated with one of the plurality of scene sub-domains is mapped to a plurality of measurement sub-domains. One or more scattering coefficients of the scene is determined by applying the mapping to the received data. Related apparatus, systems, techniques, and articles are also described.

A multi-pixel terahertz transceiver is constructed using a stack of semiconductor layers that communicate using vias defined within the semiconductor layers. By using a stack of semiconductor layers, the various electrical functions of each layer can be tested easily without having to assemble the entire transceiver. In addition, the design allows the production of a transceiver having pixels set 10 mm apart.