Methods for detecting the presence of a living object and a multi-statistical radar system

Abstract

Multi-statistical radar system (200) comprising multiple UWB tags (10) for simultaneously detecting multiple living objects (20) and / or for representing a space with UWB, wherein a UWB tag (10) comprises at least one UWB front-end transceiver (11) and the UWB tag (10) is configured to transmit multiple pulses (30) and receive multiple associated reflected channel pulse responses (32) and subsequently evaluate them for a change in the received associated reflected channel pulse responses (32), wherein the detection of the change in the associated reflected channel pulse responses (32) indicates the presence of the living object (20), wherein the UWB tag (10) is a disposable consumable product, wherein the multi-statistical radar system (100) is configured to include, for each pair of UWB front-end transceivers (11), a transmitting antenna (12), TX, and a receiving antenna (13, 14), RX,each of the two UWB front-end transceivers (11) is separated to obtain a single channel impulse response (32).

Description

[0001] The present invention relates to a method for detecting the presence of a living object using at least one UWB tag and a multi-statistical radar system.

[0002] These days, when special forces have to storm a house, it is common practice to blow up the front door. Fig. Figure 1 depicts a classic scenario where terrorists block a door. The special forces unit is positioned on the right, at a safe distance from the door, ready to detonate the explosive device they have planted and then storm the house. However, on the left side, hostages have been placed directly behind the door, who would be severely injured by the explosion. The special forces unit might be unaware of the hostages, meaning they would likely detonate the device and risk injuring the hostages. Ideally, however, the special forces unit receives information that hostages have been placed on the other side of the door and abort the detonation, opening the door by another method or choosing a different entrance to enter the house.

[0003] Blowing open the door can injure people or other living beings on the other side. Especially if the door has been barricaded by terrorists, there is a high probability that hostages are placed directly behind it. In such a scenario, blowing open the door would result in serious injury or death for the hostages.

[0004] Therefore, a solution is needed to be able to decide safely whether a door or wall, etc., can be blown open in order to reach living objects behind the door or wall, etc., without harming the living objects.

[0005] Reference [1] discloses an article on the application of the Fourier transform to UWB signals to see through walls and thereby detect movement and breathing.

[0006] The references under [2], [3] and [4] are links to a UWB GPR detector which can be used to detect people behind a wall, the UWB GPR detector being very expensive and intended to be reused.

[0007] US7999722B2 is a patent corresponding to reference [2]. US7999722B2 discloses a through-the-wall imaging device with antenna elements for transmitting and receiving signals adapted to pass through a wall to image objects behind it, and comprising a base with a support section and a plurality of spaced-apart extensions connected thereto. At least some of the antenna elements are mounted on the extensions. The area between adjacent extensions is free of any base material, at least when the extensions are in the operating state.

[0008] US 2016 / 0 043 771 A1 reveals a multi-sensor system for locating victims who may be trapped or buried.

[0009] The brochure Xaver 100: “Portable radar-based person tracking device”. Product data sheet created on May 12, 2023, pages 1 and 2. - Company publication URL: http: / / camerotech.com / wp-content / uploads / 2023 / 05 / camero-XA VER 100 brochure-DE-565.pdf discloses the Xaver 100 as a portable, radar-based person tracking device that can provide real-time information about the presence of living beings and their distance behind walls and structures.

[0010] One object of the present invention is to provide a multi-statistical radar system and a method for detecting the presence of a living object behind a visual barrier, such as a door or a wall, etc.

[0011] This problem is solved by the subject matter of the attached independent claims.

[0012] To avoid a scenario like the one just described, it is suggested that a UWB tag be attached to a visual barrier, such as a door or wall. This tag would be placed on the side of the special forces unit and would signal to them whether someone is in close proximity behind the door. Depending on whether the UWB tag indicates that someone is behind the door or wall, the door could be breached, or the building could be entered by another means to avoid harming living subjects, such as hostages.

[0013] The proposed multi-statistical radar system comprises multiple UWB tags to detect multiple living objects (20) simultaneously and / or to represent a space with UWB. A UWB tag is configured to transmit multiple pulses and receive multiple associated reflected channel pulse responses, and subsequently evaluate the received reflected channel pulse responses for any change in the associated reflected channel pulse responses, the detection of which indicates the presence of the living object. The UWB tag is a disposable, consumable product. The multi-statistical radar system is configured to receive a single channel pulse response per pair of UWB front-end transceivers, in which a transmit antenna, TX, and a receive antenna, RX, are separated from each other in each of the two UWB front-end transceivers.

[0014] The described UWB tag of the multi-statistical radar system can be used to attach the UWB tag to a door to detect whether someone is on the other side of the door and, if so, at what distance. This information can then be used to decide whether to force entry or to choose another method to open the door.

[0015] Another aspect of the present invention relates to a method for detecting the presence of a living object using the multi-statistical radar system described herein. The method comprises arranging the at least one UWB tag on a non-living object, transmitting several pulses through the at least one UWB tag, wherein the UWB tag comprises at least one UWB front-end transceiver, receiving several associated reflected channel pulse responses, and evaluating the received associated reflected channel pulse responses for a change in the received associated reflected channel pulse responses, wherein the detection of the change in the associated reflected channel pulse responses indicates the presence of the living object.The detection of the change in the received, reflected channel impulse responses suggests that a living object is present behind the screen.

[0016] The procedure described herein can be implemented and executed using a computer program product, provided that the computer program product is running on a computer.

[0017] Further advantageous embodiments of the present invention are the subject of dependent patent claims.

[0018] Preferred embodiments of the present teaching are described below in connection with the accompanying figures. It is understood that the described embodiments do not limit the scope of the teaching described herein. The figures show: Fig. 1. State of the art in how hostages are freed from a critical situation; Fig. 2 a situation in which the proposed UWB tag is applied; Fig. 3. Schematically illustrates the functionality of the proposed UWB tag; Fig. 4 schematically illustrates the structure of the proposed UWB tag; Fig. 5 schematically the situation according to Fig. 2, in which the proposed UWB tag is applied, and the UWB tag communicates with an external device; Fig. 6 schematically a multi-statistical radar system; Fig. 7 an evaluation result signal of a UWB tag; Fig. 8 a flowchart of a procedure for detecting the presence of a living object using at least one UWB tag; Fig. 9. Schematically, a 2D determination of a target object, and Fig. 10. A comparison of the measured phases with a UWB tag during two different linear movements.

[0019] The principle of the teaching disclosed herein will be further clarified below with reference to possible embodiments, whereby the detailed description of individual embodiments does not constitute a limitation of the teaching described herein.

[0020] Individual aspects of the invention described herein are set forth below. Fig. Figures 2 to 10 are described. In the present application, identical reference numerals refer to identical or equivalent elements, and it is not necessary for all reference numerals to be repeated in all drawings.

[0021] Fig. Figure 1 schematically shows how hostages are freed from a critical situation and has already been described in detail in the introductory section.

[0022] Fig. Figure 2 shows a situation in which the proposed UWB tag 10 is applied. Fig. Figure 3 schematically illustrates the functionality of the UWB tag 10. Fig. Figure 4 schematically shows the structure of a single UWB tag. Fig. 5 shows the UWB tag, which communicates with an external device 80. Fig. Figure 6 shows a multi-statistical radar system which includes at least two UWB tags. Fig. Figure 7 shows an evaluation result signal 70 of a single UWB tag 10. The proposed UWB tag is considered in conjunction with the Fig. 2 to 7s are explained below.

[0023] The proposed UWB tag 10 for detecting the presence of a living object 20, as described in the Fig. 2 to 5, which can be seen, includes at least one UWB front-end transceiver 11. The UWB tag 10 is designed to receive multiple pulses 30 (as in Fig. 3 can be seen) to send and to receive several associated reflected channel impulse responses 32 and then to evaluate with regard to a change in the received associated reflected channel impulse responses 32, whereby the detection of the change in the associated reflected channel impulse responses 32 indicates the presence of the living object 20.

[0024] The UWB front-end transceiver 11 is designed to transmit multiple pulses periodically and / or non-periodically on one or more carrier frequencies. For example, the carrier frequencies in UWB channels 5-9, i.e., between 6.5 and 8 GHz, can be used. Depending on whether energy conservation is desired, the carrier frequency of the measurements would be adaptively changed. In other words, there is a kind of wake-up mode in which pulses are transmitted less frequently and therefore less accurately, and a reflected channel pulse response is measured. During the transition between wake-up mode and an operating mode, the pulses would be transmitted more frequently, as a more accurate measurement is desired. The carrier frequency itself is periodic; only the measurement packets (i.e., the pulse sequences = the transmitted pulses) are transmitted non-periodically or with changing periods.

[0025] Fig. Figure 2 shows the scenario from Fig. 1 with the difference that a UWB tag 10 is also located at the door 22, i.e., the non-living object 22 that is to be detonated. This UWB tag 10 is located in the vicinity of an explosive device 25. The UWB tag 10 transmits, in particular periodic, pulses 30 and receives the corresponding channel pulse responses. These channel pulse responses 32 can be used to detect movements behind the door 22. For example, a movement behind the door 22 is the breathing of a living object 20, such as a human being 22. In other words, a detectable movement does not necessarily have to be a hand, leg, or movement of the whole body. A detectable movement can also be a small movement of the torso, such as that caused by human breathing or heartbeat. Of course, the significance of whether something has moved depends on the size of the surface area moved.However, the so-called radar cross-section of a breathing human body is normally sufficient to detect the breathing person with the proposed UWB tag 10.

[0026] Fig. Figure 3 schematically illustrates the operating principle of the UWB tag 10, which utilizes UWB radar technology. The UWB tag 10 emits a sequence of pulses 30 on one side of the door 22. This pulse sequence penetrates the door 22 and enters the room, where it then encounters a reflective surface, for example, a person 22, i.e., the living object 22, on the other side of the door 22. The signal reflected back from the person 22, i.e., the channel pulse response 32, then propagates back through the room towards the door 22 and penetrates it. On the other side of the door 22 is the UWB tag 10, which receives the reflected pulses, i.e., the channel pulse responses 32, and then processes them.

[0027] The UWB front-end transceiver 11 is configured to transmit pulses 30 convolved with a correlation identifier, based on which the corresponding reflected channel pulse responses 32 can be determined. In principle, a pulse is convolved with a code sequence that has good correlation properties. In other words, instead of transmitting just a single pulse, a sequence of positive and negative pulses, convolved with the code sequence, is transmitted. Ipatov preambles, for example, have good correlation properties. They possess ideal autocorrelation; that is, if the preamble is correlated with itself, only a single pulse is obtained as the correlation result. If the preamble is correlated with other Ipatov preambles, a comparatively very weak correlation result is obtained.

[0028] As in Fig. As shown in Figure 4, the UWB front-end transceiver 11 can comprise at least one transmitting antenna 12 for sending the multiple pulses 30 and at least two receiving antennas 13, 14 for receiving the reflected channel pulse responses 32. It is also possible for one antenna 12, 13, 14 to serve as both a receiving and a transmitting antenna. In other words, the at least one transmitting antenna 12 for sending the multiple pulses 30 and the at least one receiving antenna 13, 14 can be provided by a single antenna. Unlike in Figure 4, the UWB front-end transceiver 11 can be configured as follows: Fig. As shown in Figure 4, the UWB Tag 10 could be configured with only a single antenna, which serves as both a transmitting and receiving antenna. As shown in Fig. As shown in Figure 4, the at least two receiving antennas 13, 14 in the single UWB tag 10 can, for example, be arranged at a distance from each other. If, for example, at least two UWB tags are used, either two receiving antennas 13, 14 (one receiving antenna 13, 14 per UWB tag 10) or at least four receiving antennas 13, 14 (two receiving antennas 13, 14 per UWB tag 10) can be present, with the receiving antennas 13, 14 being arranged at a distance from each other. There are also many other possibilities for positioning the receiving antennas 13, 14 relative to each other. The number of antennas 12, 13, 14 and / or their relative positions can also be varied as desired.

[0029] The UWB tag 10 is designed to receive multiple, in particular different, channel pulse responses (32), especially sequentially and / or simultaneously, depending on the number of receiving antennas 13, 14. The number of antennas can be as small as one, which serves as both a transmit and receive antenna. Alternatively, the number of antennas can be two or more. In particular, transmit antennas can be used. For simultaneous reception, different preamble codes are required, which should differ as much as possible with respect to their correlation properties. For sequential reception of the channel pulse responses 32, the preambles need not differ, provided there are no external devices that use the same preambles and would impede coexistence.

[0030] The UWB tag 10 comprises a control unit 40 and a motion indicator interface 50. The control unit 40 communicates with the UWB front-end transceiver 11 and the motion indicator interface 50 to receive and evaluate the reflected channel pulse responses 32 for any changes. Upon successful detection of a change, the control unit transmits an evaluation result signal 72 to the motion indicator interface 50, which is configured to indicate the presence of the living object 20, in particular a user. The communication link between the control unit 40 and the motion indicator interface 50 can be unidirectional. However, bidirectional communication is also possible. Preferably, the communication link between the control unit 40 and the UWB front-end transceiver 11 is bidirectional.The control unit 40 is designed to evaluate the received reflected channel impulse responses 32 after reception. During evaluation, it can be determined whether the received reflected channel impulse responses 32 exhibit a change in their phase over time. The change is detected by a recorded period (sine or cosine waveform) in the determined phase. Fig. Figure 7 shows, for example, two evaluation result signals 70, 72, 73. Evaluation result signal 73 shows, on average, a horizontal straight line at 0 degrees and corresponds to the evaluation result signal obtained when no respiration by a living object 20 is detectable. If no movement, such as respiration and / or a heartbeat, is detected, the channel impulse response 32 does not record a period, but rather an average straight line over time (see Figure 73). Fig. 7) The evaluation result signal 72 is a periodically changing phase signal indicating that respiration by a living object 20 could be detected using the UWB tag 10. The evaluation result signal 72 exhibits one period. In other words, respiration is indicated by the phase / position change within the period of the evaluation result signal 72. Fig. 7 detected. If the living object 20, such as a person, were not breathing, then no period would be visible in the phase, as shown in the representation of the evaluation result signal 73 in Fig. 7 can be seen. Therefore, the evaluation result signal 70 without movement, such as breathing, is shown as a horizontal line 73 in Fig. 7 can be seen. The evaluation result signal 73 can be used to scan a room using UWB. In the evaluation result signal 70, 72 with movement, especially with breathing, the period in the phase signal can be seen. The duration of the period depends on the breathing rate. In Fig. Figure 7 shows, for example, a 10-second period, which indicates very slow breathing. The period would change with the breathing rate. The sine curve 73 in Fig. Figure 7 shows the rise and fall of the breathing person's chest. Mathematically, one would search for a periodic motion using a Fourier transform. Generally, however, it would suffice to detect any motion (such as movement of the living object, etc.) that stands out from the noise. For example, it is possible to detect upper body movement through the heartbeat if the living object is holding its breath.

[0031] How Fig. Figure 4 shows that the UWB tag 10 includes the power management unit 81 (PMU), which is preferably powered by batteries 82, since cables would have disadvantages regarding flexibility and maximum distance when positioning the UWB tag 10 on a non-living object 22. The control unit 40 manages the device status and the control of the UWB front-end transceiver 11. Furthermore, the control unit 40 also reads the channel pulse responses 32 from the UWB front-end transceiver 11 and evaluates them. Changes in the channel pulse response 32 indicate movement. Such a change in the channel pulse response 32 can be detected by means of a definable threshold value that is exceeded. The threshold is a value that indicates, for example, how large the movement should be, such as 1-2cm amplitude in channel impulse response 32 to indicate respiration.This value is just one example and may differ depending on the application (e.g., detection of breathing and heartbeat). It is also conceivable that a signal indicating the noise ratio determines the threshold value alone or influences it in addition to the possibilities already described. If the threshold value is exceeded, the motion indicator interface 50 is instructed by the control unit 40 to signal a movement. Depending on the system implementation, the motion indicator interface 50 can be relatively simple, for example, using an LED, or more complex and send a signal to one or more external devices 80 so that they can visualize the movement accordingly. Such a visualization could, for example, take place on a mobile device held by the special unit (see...). Fig. 5).

[0032] The motion indicator interface 50 is designed to display the change directly at the UWB tag 11 and / or, after forwarding the evaluation result signal 70, 72, 73 indicating the change, to at least one external device 80, either visually and / or audibly to a user 90. Visually, the detected change could be indicated, for example, by a light indicator (such as an LED) in different colors. Green light could indicate the detection of a change, i.e., breathing by a living object 20. Red light could indicate the absence of a change, i.e., no breathing. Naturally, such color codes could vary as desired. Audibly, the detected change could be indicated, for example, by an audible signal, i.e., by emitting a specific tone in the respective situation.The change could be displayed, for example, on an external, especially mobile, device 80, such as a mobile phone or a smartphone.

[0033] The evaluation result signal 70, 72, 73 includes information for reproducing a radar response, such as scanning a room using UWB, and / or information about the type of movement of the living object 20. A radar response is given here by the associated channel pulse response, which changes over time (see the evaluation result signal 72 in Fig. 7) These temporal changes are evident from phase and amplitude changes in the channel impulse response. As already mentioned in Fig. As described in section 7, respiration is detected by the phase / position change of the peaks. Depending on the movement, the phase and amplitude of the channel impulse response will change differently. For example, during respiration, a periodic change in the breathing frequency is observed. During linear movement, the movement speed is reflected in the phase. Fig. Figure 10 shows a comparison of the measured phases with a UWB Tag 10 during a first linear movement of 0.1 m / s and a second linear movement of 0.2 m / s. The second linear movement is twice as fast as the first. Consequently, the phase period of the second linear movement is twice as fast as the phase period of the first.

[0034] The UWB tag 10 and the external device 80 are designed to communicate with each other, especially bidirectionally, via a data channel 55 such as UWB, Wi-Fi, or BLE. Fig. Figure 5 shows the external device 80, for example, as a smartphone. The external device 80 could be an external mobile device such as a laptop or the like. The control unit 40 could be controlled via the external device 80.

[0035] The mobile external device 80 can, for example, display the detailed evaluated radar response, i.e., an evaluation result signal 70, 72, 73, and reveal more information about the type of movement (see Fig. 5) For example, a radar response can indicate the speed and / or direction of movement of a living object and / or the distance at which the living object is moving. Data channel 55 between the UWB tag 10 and the external device 80 can be transmitted via UWB, but other data channels 55, such as Wi-Fi, BLE, etc., would also be suitable candidates depending on the system implementation. The UWB front-end transceiver 11 itself can potentially transmit pulses 30 on one or more carrier frequencies. Combining the channel pulse responses of the carrier frequencies can improve accuracy, i.e., system performance. Combining the channel pulse responses of the carrier frequencies is called channel stitching or band stitching. This involves combining time-shifted measurements on different channels to obtain a measurement with a higher virtual bandwidth.Normally, UWB radar technologies use simple pulse transmissions without a specific correlation identifier (correlation code). However, coexistence can be improved using Ipatov preambles, which are defined in IEEE 802.15.4z / ab, leading to better system scalability. Whether or not correlation codes are used depends on the implementation of UWB Tag 10. Ipatov preambles are mathematical convolutional codes with ideal autocorrelation properties and relatively good isolation between codes.

[0036] The UWB tag 10 is preferably a disposable product that would be destroyed in the event of an explosion. This is because, as in the Fig. 2 and Fig. As shown in Figure 5, if explosive 25 were applied near the UWB tag 10 to a non-living object 22, such as a door 22 or a wall 22a, and the non-living object 22 were detonated after the detection of the change, i.e., the breathing of a living object 20 behind the non-living object 22, the UWB tag 10 would be destroyed in the explosion. The proposed UWB tag could have an adhesive on its back for attaching the UWB tag 10 to a non-living object 22. The UWB tag 10 is designed as a circuit board housed, in particular encased, in a casing.

[0037] A UWB tag 10 is preferably attached to a non-living object 22 that does not have a solid surface in the direction of radiation. If the non-living object 22 to which a UWB tag 10 is attached contains too much metal, the emitted pulses can no longer transmit to the non-living object.

[0038] Fig. Figure 6 shows another aspect of the present invention. Fig. Figure 6 shows a multi-statistical radar system 200. The proposed multi-statistical radar system 200 comprises several UWB tags 10 described herein to detect multiple living objects 20 simultaneously and / or to represent a space with UWB. "Representing the space" here refers to a representation of living objects 20 in space. When a pulse is reflected by a non-living object 22, the reflected channel pulse response exhibits no phase shift. If the different pulses of the multi-statistical radar system 200 are reflected by different living objects 20, the different positions of the living objects can be represented three-dimensionally using the detected changes. Fig. Figure 9 shows, for example, how the 2D position of a target can be determined in two dimensions. The two dimensions comprise an X and a Y coordinate. For example, a UWB tag 10 could be used to transmit multiple pulses and to receive the channel pulse responses 32 reflected from the object 20, 22. Furthermore, additional UWB tags 10 could be used solely to receive the same channel pulse responses 32, with the additional UWB tags 10 being located at different points, i.e., spaced apart from each other. In other words, only one UWB tag 10 transmits pulses, while multiple UWB tags 10 detect the channel pulse responses. From the detected channel pulse responses, the position of the target can then be determined in two dimensions (X, Y).

[0039] In Fig. For example, 6 four UWB tags 10 are attached to a door 22, the inanimate object 22. In other words, with the multi-statistical radar system 200 from Fig. Up to four living objects could be detected. It should be noted that each UWB tag scans a different solid angle using UWB.

[0040] Preferably, the multiple UWB tags 10 are arranged on at least one inanimate object 22, in particular wherein an inanimate object 22 is a door 22 or a wall 22a or a substantially stationary or immobile device. The immobile device could, for example, be a submachine gun or the like. The UWB tag 10 can be placed directly on an immobile device such as a weapon, thereby also enabling the detection of movement in other rooms, provided that this device is kept relatively still.

[0041] The placement and number of UWB tags can also vary from scenario to scenario. For example, to improve system performance and imaging, the multi-static radar system can be built from several UWB tags to detect multiple living objects simultaneously.

[0042] Fig. Figure 6 shows an example of how multiple UWB tags can be placed to create a kind of X-ray image of the room using UWB technology. The placement and number of tags can vary depending on how many objects need to be detected and how detailed the image of the room needs to be.

[0043] The multi-statistical radar system 200 is designed to receive a single channel pulse response 32 per pair of UWB front-end transceivers 11, in which the transmitting antenna 12, TX, and the receiving antenna 13, 14, RX, are separated from each other in either of the two UWB front-end transceivers 11 or in one and the same UWB front-end transceiver 11. In other words, a single pair of UWB front-end transceivers 11 can receive one channel pulse response. The more pairs of UWB front-end transceivers 11 are used, the more channel pulse responses can be received. This allows for the reception of multiple signals or multiple channel pulse responses 32, thereby improving the accuracy of the radar response or of an image corresponding to the radar response.

[0044] In other words, in a multi-static radar system 200, multiple UWB tags 10 allow the creation of multiple channel pulse responses 32. The multi-static radar system 200 can also be formed by UWB tags, each of which has only one TX / RX antenna. If only one TX / RX antenna is present in a UWB tag, it transmits TX / RX pulses and receives the reflected channel pulse responses 32. In this case, with N UWB tags 10, one can create N*(N-1) channel pulse responses 32, since one channel pulse response 32 can be created from each pair of UWB tags, thus creating a much more detailed picture of the constellation of space. In the equation above, N is actually the number of TX / RX antennas; that is, the more antennas a tag has, the more channel pulse responses 32 can be created.

[0045] One advantage of the multi-static radar system 200, as it is used in Fig. Figure 6 shows that the multi-static radar system 200 typically improves antenna isolation because the antennas 12, 13, 14 of the multiple UWB tags 10 are spatially further separated from each other due to the arrangement of the UWB tags 10, which allows direct crosstalk to be suppressed more effectively.

[0046] The multi-statistical radar system 200 described herein is designed to perform a procedure 100, which is described below.

[0047] Fig. 8 second a further aspect of the present invention. Fig. Figure 8 shows a flowchart of a procedure 100 for detecting the presence of a living object 20 using at least one UWB tag 10.

[0048] Method 100 for detecting the presence of a living object 20 using at least one UWB tag 10 comprises, in step 110, placing the at least one UWB tag 10 on a non-living object 22. In step 120, method 100 comprises transmitting several pulses 30 through the at least one UWB tag 10, which includes at least one UWB front-end transceiver 11. In step 130, method 100 comprises receiving several associated reflected channel pulse responses 32. Finally, in step 140, method 100 comprises evaluating the received several associated reflected channel pulse responses 32 for a change in the received associated reflected channel pulse responses 32, the detection of which indicates the presence of the living object 20.Procedure steps 110, 120, 130, 140 are to be carried out in ascending order.

[0049] Method 100 can comprise periodic or non-periodic transmission of multiple pulses 30 on one or more carrier frequencies. Additionally or alternatively, the method can include transmitting each pulse 30 with a correlation identifier (correlation code) based on which the corresponding reflected channel pulse response 32 can be determined. As already described in connection with device 10, it is possible to switch from periodic to non-periodic transmission or vice versa. The periodic and non-periodic transmissions preferably occur sequentially.

[0050] The method 100 can include, in particular sequential and / or simultaneous, reception of several channel pulse responses 32, in particular from different transmitters 11.

[0051] Method 100 comprises, upon detection of the change, transmitting an evaluation result signal 70, 72 to a motion indication interface 50 and / or to at least one external device 80 to indicate the presence of the living object 20, wherein Method 100 includes displaying the change directly on the UWB tag 10 and / or on the at least one external device 80. The method further comprises transmitting an evaluation result signal 70, 72 to a motion indication interface 50 and / or to at least one external device 80 to indicate that no living object 20 has been detected. Details regarding this have already been described in connection with the UWB tag 10, to which reference is hereby made.

[0052] The procedure 100 further includes communication between the UWB tag 10 and the external device 80 via a data channel 55 such as UWB or Wifi or BLE.

[0053] According to another aspect, the UWB tag 10 described herein may be intended as a computer program product for carrying out a procedure 100 described herein, if the computer program product runs on a computer.

[0054] Although some aspects relating to a device have been described, it is understood that these aspects also constitute a description of a corresponding method, so that a block or component of the device can also be understood as a corresponding method step or as a feature of a method step. A complete description of the present invention in the form of method features is omitted here for reasons of redundancy.

[0055] In the preceding detailed description, various features were sometimes grouped together in examples to streamline the disclosure. This type of disclosure should not be interpreted as indicating that the claimed examples have more features than are expressly stated in each claim. Rather, as the following claims reflect, the subject matter may consist of fewer than all the features of a single disclosed example. Consequently, the following claims are hereby incorporated into the detailed description, with each claim potentially representing a separate example.While each claim can stand as a separate example, it should be noted that, although dependent claims refer back to a specific combination with one or more other claims, other examples also include a combination of dependent claims with the subject matter of any other dependent claim, or a combination of any feature with other dependent or independent claims. Such combinations are included unless it is stated that a specific combination is not intended. Furthermore, it is intended that a combination of features of a claim with any other independent claim is also included, even if that claim is not directly dependent on the independent claim. References 1. https: / / jwen-eurasipjournals.springeropen.com / articles / 10.1186 / 1687-1499-2011-20 2. https: / / spyassociates.com / ultra-wideband-gapr-detector-to-see-throuah-walls-Qround / 3. https: / / retwis.eu / 4. https: / / themedialine.org / life-lines / new-israeli-tech-that-can-see-through-walls-tobe-unvei1ed-at-paris-mi1itary-expo

Claims

[1] Multi-statistical radar system (200) comprising multiple UWB tags (10) for the simultaneous detection of multiple living objects (20) and / or for the representation of a space with UWB, wherein a UWB tag (10) comprises at least one UWB front-end transceiver (11) and the UWB tag (10) is configured to transmit multiple pulses (30) and to receive multiple associated reflected channel pulse responses (32) and subsequently evaluate them for a change in the received associated reflected channel pulse responses (32), wherein the detection of the change in the associated reflected channel pulse responses (32) indicates the presence of the living object (20), wherein the UWB tag (10) is a disposable consumable product, wherein the multi-statistical radar system (100) is configured to include, for each pair of UWB front-end transceivers (11), a transmitting antenna (12), TX, and a receiving antenna (13, 14), RX,each of the two UWB front-end transceivers (11) is separated to obtain a single channel impulse response (32). [2] Multi-statistical radar system (200) according to claim 1, wherein the UWB front-end transceiver (11) is configured to transmit the multiple pulses periodically and / or non-periodically on one or more carrier frequencies. [3] Multi-statistical radar system (200) according to claim 1 or 2, wherein the UWB front-end transceiver (11) is configured to send the pulses (30) folded with a correlation identifier on the basis of which the corresponding reflected channel pulse response (32) can be determined. [4] Multi-statistical radar system (200) according to one of claims 1 to 3, wherein the UWB front-end transceiver (11) comprises at least one transmitting antenna (12) for transmitting the multiple pulses (30) and at least one receiving antenna (13, 14) for receiving the reflected channel pulse responses (32). [5] Multi-statistical radar system (200) according to claim 4, wherein the UWB tag (10) is configured to receive multiple channel pulse responses (32), in particular sequentially and / or simultaneously, depending on the number of receiving antennas (13, 14), in particular from different transmitters. [6] Multi-statistical radar system (200) according to one of the preceding claims, wherein the UWB tag (10) comprises a control unit (40) and a motion indication interface (50), wherein the control unit (40) is in communication connection with the UWB front-end transceiver (11) and with the motion indication interface (50) in order to receive the reflected channel pulse responses (32) and evaluate them with respect to the change and subsequently, after positive detection of the change, to transmit an evaluation result signal (70, 72, 73) to the motion indication interface (50), which is configured to indicate the presence of the living object (20). [7] Multi-statistical radar system (200) according to claim 6, wherein the motion display interface (50) is configured to display the change directly at the UWB tag (11) and / or after forwarding the evaluation result signal (70) indicating the change to at least one external device (80) optically and / or acoustically to a user (90). [8] Multi-statistical radar system (200) according to claim 7, wherein the evaluation result signal (70) comprises information to reproduce a radar response and / or information about the nature of a movement of the living object (20). [9] Multi-statistical radar system (200) according to claim 7 or 8, wherein the UWB tag (10) and the external device (80) are configured to communicate with each other via a data channel such as UWB or Wifi or BLE, in particular bidirectionally. [10] Multi-statistical radar system (200) according to one of the preceding claims, wherein the UWB tag (10) comprises a power control unit (81), PMU, wherein the power control unit (81) is configured to supply the UWB tag (10) with power via a battery (82). [11] Multi-statistical radar system (200) according to any one of claims 1 to 10, wherein the multiple UWB tags (10) are arranged on at least one non-living object (20), in particular wherein a non-living object (20) is a door or a wall or a substantially stationary or stationary device. [12] Method (100) for detecting the presence of a living object (20) using at least one multi-statistical radar system (200) according to any one of claims 1 to 11, wherein the method comprises: Arranging at least one UWB tag (10) on a non-living object (22); Transmitting multiple pulses (30) through at least one UWB tag (10) which includes at least one UWB frontend transceiver (11); Receiving several associated reflected channel impulse responses (32); and Evaluating the received multiple associated reflected channel impulse responses (32) with respect to a change in the received associated reflected channel impulse responses (32), wherein the detection of the change in the associated reflected channel impulse responses (32) indicates the presence of the living object (20). [13] Method (100) according to claim 12, wherein the method (100) comprises: periodic or non-periodic transmission of the multiple pulses (30) on one or more carrier frequencies; and / or Sending each pulse (30) with a correlation identifier on the basis of which the corresponding reflected channel pulse response (32) can be determined. [14] Method according to claim 12 or 13, wherein the method comprises: in particular sequential and / or simultaneous reception of multiple channel pulse responses, especially from different transmitters (32). [15] Method according to any one of claims 12 to 14, wherein the method comprises: Upon detection of the change, an evaluation result signal (70) is transmitted to a motion indication interface (50S) and / or to at least one external device (80) to indicate the presence of the living object (20), wherein the procedure (100) includes displaying the change directly on the UWB tag (10) and / or on the at least one external device (80). [16] Method (100) according to claim 15, wherein the method (100) comprises: Communication between the UWB tag (10) and the external device (80) via a data channel such as UWB or Wifi or BLE. [17] Computer program product for carrying out a method (100) according to any one of claims 12 to 16, when the computer program product runs on a computer.

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