US-12626076-B2 - System and method for scanning persons and/or objects

Abstract

A system for scanning persons and/or objects is provided. Said system comprises at least two scan modules for transmitting and/or receiving radio frequency, RF, signals with respect to the persons and/or objects, each of said at least two scan modules comprising at least one transmit antenna and/or at least one receive antenna and/or at least one transceiver, and a crossing-through passage to be passed by the persons and/or objects, wherein the at least two scan modules are angled to allow reflections of the RF signals from at least one of the at least two scan modules to at least one other one of the at least two scan modules.

Inventors

• Matthias GAREIS
• Maya Radzinski
• Andreas Schiessl

Assignees

• ROHDE & SCHWARZ GMBH & CO. KG

Dates

Publication Date

20260512

Application Date

20241024

Claims (17)

1. 1 . A system for scanning persons and/or objects, comprising: at least two scan modules for transmitting and/or receiving radio frequency (RF) signals with respect to the persons and/or objects, each of said at least two scan modules comprising at least one transmit antenna and/or at least one receive antenna and/or at least one transceiver, a crossing-through passage to be passed by the persons and/or objects, and a processing unit connected to the at least two scan modules, wherein the at least two scan modules are angled to allow reflections of the RF signals from at least one of the at least two scan modules to at least one other one of the at least two scan modules, wherein the at least two scan modules are partially or pairwise synchronized, and wherein synchronization concerns code multiplexing.
2. 2 . The system according to claim 1 , wherein at least one of the at least two scan modules comprises or is a scan panel, or wherein at least one of the at least two scan modules comprises multiple transmit antennas and/or multiple receive antennas and/or multiple transceivers.
3. 3 . The system according to claim 1 , wherein the at least two scan modules are symmetrically angled with respect to an axis of symmetry or a center axis at an angle of more than 0 and less than 90 degrees or at an angle between 30 and 70 degrees.
4. 4 . The system according to claim 3 , wherein the axis of symmetry or the center axis runs parallel or substantially parallel to the crossing-through passage, or wherein the crossing-through passage is symmetric or substantially symmetric to the axis of symmetry or the center axis.
5. 5 . The system according to claim 1 , wherein the processing unit is configured to synchronize the transmitting by the at least two scan modules with the receiving by the at least two scan modules, especially with respect to a part or at least one pair or each of the at least two scan modules.
6. 6 . The system according to claim 1 , wherein the processing unit is configured to use corresponding reflections of the RF signals from the persons and/or objects, caused by at least one of the at least two scan modules, to at least one other one of the at least two scan modules, especially to improve scan quality, or wherein the processing unit is configured to use corresponding reflections of the RF signals from the persons and/or objects, caused by at least one of the at least two scan modules, to at least one same one of the at least two scan modules.
7. 7 . The system according to claim 6 , wherein the processing unit is configured to combine the corresponding reflections of the RF signals from the persons and/or objects, caused by the at least one of the at least two scan modules, to the at least one other one of the at least two scan modules with the corresponding reflections of the RF signals from the persons and/or objects, caused by the at least one of the at least two scan modules, to the at least one same one of the at least two scan modules.
8. 8 . The system according to claim 5 , wherein the processing unit is configured to obtain multiple squared channels, especially for calculating a scan image, by synchronizing the transmitting by the at least two scan modules with the receiving by the at least two scan modules.
9. 9 . The system according to claim 1 , wherein the at least two scan modules are angled with crowns, or wherein at least two of the at least two scan modules are arranged in different planes.
10. 10 . The system according to claim 1 , wherein the system further comprises a floor having RF mirror functionality, and wherein the processing unit is configured to use the floor as mirror channels.
11. 11 . The system according to claim 1 , wherein the at least two scan modules comprise or are two sets of angled scan modules facing in that create a portal for the crossing-through passage.
12. 12 . The system according to claim 11 , wherein the two sets of angled scan modules form an X-geometry or an X-like geometry or a parenthesis-geometry or a parenthesis-like geometry.
13. 13 . The system according to claim 1 , wherein the at least two scan modules comprise or are three pairs of scan modules in an octagon or an octagon-like configuration, especially with two sides open for the crossing-through passage.
14. 14 . The system according to claim 1 , wherein at least a part or at least one pair or each of the at least two scan modules is rotatory and/or translatory movable.
15. 15 . The system according to claim 1 , wherein the processing unit is configured to distinguish and/or classify the objects based on different scan scenarios with multiple objects.
16. 16 . A method for scanning persons and/or objects, comprising the steps of: transmitting and/or receiving radio frequency (RF) signals with respect to the persons and/or objects with the aid of at least two scan modules, each of said at least two scan modules comprising at least one transmit antenna and/or at least one receive antenna and/or at least one transceiver, providing a crossing-through passage to be passed by the persons and/or objects, arranging the at least two scan modules such that the at least two scan modules are angled to allow reflections of the RF signals from at least one of the at least two scan modules to at least one other one of the at least two scan modules, and a processing unit synchronizing the transmitting by the at least two scan modules with the receiving by the at least two scan modules, especially with respect to at least one pair or the at least two scan modules, wherein synchronization concerns code multiplexing.
17. 17 . The method according to claim 16 , wherein the method further comprises the step(s) of: using corresponding reflections of the RF signals from the persons and/or objects, caused by at least one of the at least two scan modules, to at least one other one of the at least two scan modules, especially to improve scan quality, or using corresponding reflections of the RF signals from the persons and/or objects, caused by at least one of the at least two scan modules, to at least one same one of the at least two scan modules.

Description

TECHNICAL FIELD The disclosure relates to a system for scanning persons and/or objects, and a method for scanning persons and/or objects. BACKGROUND ART In recent years, activities at public spaces like airport entrances and government buildings have significantly increased in public perception. A number of solutions for ensuring security have been suggested in the past. For instance, U.S. Pat. No. 10,261,177 B2 relates to systems and methods for scanning objects and persons, for example, persons in security gates, by means of microwave radiation. Such a system includes an arrangement of several panels between which an angled walk-through passage is formed. Furthermore, U.S. Pat. No. 10,585,185 B2 discloses a system for scanning a form of interest, while the form of interest is in motion. The system comprises a first detector panel-pair, comprising a first detector panel and a second detector panel, spatially offset from the first detector panel by a first continuous passageway for the motion of the form of interest. A second detector panel-pair comprises a third detector panel and a fourth detector panel, spatially offset from the third detector panel by a second continuous passageway for the motion of the form of interest, and a location-tracking device adapted to monitor the location of the form of interest. Disadvantageously, detection performance cannot be increased in a particularly efficient manner with reduced costs. SUMMARY Thus, there is a need to provide an improved system and an improved method for scanning persons and/or objects, especially in the sense of an efficiently increased detection performance with reduced costs. This is achieved by the embodiments provided in the enclosed independent claims. Advantageous implementations of the present disclosure are further defined in the dependent claims. According to a first aspect of the present disclosure, a system for scanning persons and/or objects is provided. Said system comprises at least two scan modules for transmitting and/or receiving radio frequency, RF, signals with respect to the persons and/or objects, each of said at least two scan modules comprising at least one transmit antenna and/or at least one receive antenna and/or at least one transceiver, and a crossing-through passage to be passed by the persons and/or objects, wherein the at least two scan modules are angled to allow reflections of the RF signals from at least one of the at least two scan modules to at least one other one of the at least two scan modules. Advantageously, detection performance can be increased in a particularly efficient manner with reduced costs. Further advantageously, not only illumination improves scan quality, but also additional channels enhance scan quality especially due to lower side lobes and lower noise. According to an implementation form of the first aspect of the present disclosure, at least one, preferably each, of the at least two scan modules comprises or is a scan panel. In addition to this or as an alternative, at least one, preferably each, of the at least two scan modules comprises multiple transmit antennas and/or multiple receive antennas and/or multiple transceivers. Advantageously, for instance, efficiency can be increased. According to an implementation form of the first aspect of the present disclosure, the at least two scan modules are symmetrically angled with respect to an axis of symmetry or a center axis at an angle of more than 0 and less than 90 degrees, preferably at an angle between 30 and 70 degrees. Advantageously, for example, scan quality or detection performance, respectively, can further be increased. According to an implementation form of the first aspect of the present disclosure, the axis of symmetry or the center axis runs parallel or substantially parallel to the crossing-through passage. In addition to this or as an alternative, the crossing-through passage is symmetric or substantially symmetric to the axis of symmetry or the center axis. Advantageously, for instance, complexity can be reduced, thereby increasing efficiency. With respect to the above-mentioned term “substantially parallel”, it is noted that said term may especially be understood as a deviation of not more than 30 degrees, preferably not more than 20 degrees, more preferably not more than 10 degrees, most preferably not more than 5 degrees, from parallelism. With respect to the above-mentioned term “substantially symmetric”, it is noted that said term may especially be understood as a deviation of not more than 30 percent, preferably not more than 20 percent, more preferably not more than 10 percent, most preferably not more than 5 percent, from symmetry. According to an implementation form of the first aspect of the present disclosure, the at least two scan modules are partially or pairwise synchronized. Advantageously, for example, detection performance can further be improved. Further advantageously, synchronization can concern time and/or