CONTROL METHOD, CONTROL DEVICE AND CONTROL SYSTEM

Abstract

A position-dependent control method is provided. The method involves receiving a first part of the UWB packet from a first UWB transceiver via a first antenna of a second UWB transceiver, where the first antenna is located within an accessible space; determining a first distance between the first UWB transceiver and the first antenna from the first part of the UWB packet; receiving a second part of the UWB packet from the first UWB transceiver via a second antenna of the second UWB transceiver, where the second antenna is located outside the accessible space; determining a second distance between the first UWB transceiver and the second antenna from the second part of the UWB packet; comparing a value of the first distance with a value of the second distance; and determining whether the first UWB transceiver is located inside or outside the accessible space.by determining that the first UWB transceiver is located within the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-free space.

Description

AREA OF TECHNOLOGY

[0001] The present disclosure relates to a position-dependent control method, a control device and a control system. STATE OF THE ART

[0002] In the prior art, some systems require knowledge of the position of a device in relation to a closed structure, in particular whether the device is located inside or outside a barrier-protected space, also known as inside-outside detection (or IA detection for short), which can be a common problem.

[0003] For example, WO 2022 / 253949 A1 discloses a UWB localization device designed to determine a first arrival time between a further device and a first antenna and a second arrival time between the further device and a second antenna, wherein both antennas are located inside the device and are separated from each other by a UWB shield designed to ensure that a UWB signal from the further device has an unshielded path either only to the first antenna or only to the second antenna.

[0004] The determined first and second arrival times are used to determine whether the device is closer to the first antenna or the second antenna.

[0005] However, the device described above has a complex and expensive design, which includes the UWB shielding in combination with the two transmit / receive paths (for the first antenna and the second antenna). BRIEF SUMMARY OF THE INVENTION

[0006] A position-dependent control method is provided. The method involves receiving the first part of a UWB packet from a first UWB transceiver via the first antenna of a second UWB transceiver, where the first antenna is located within an accessible space; determining the first distance between the first UWB transceiver and the first antenna from the first part of the UWB packet; receiving the second part of the UWB packet from the first UWB transceiver via the second antenna of the second UWB transceiver, where the second antenna is located outside the accessible space; determining the second distance between the first UWB transceiver and the second antenna from the second part of the UWB packet; comparing a value of the first distance with a value of the second distance; and determining whether the first UWB transceiver is located inside or outside the accessible space.by determining that the first UWB transceiver is located within the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-free space.

[0007] Experts will recognize additional features and advantages upon reading the following detailed description and examining the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present disclosure is illustrated by way of example, but not as an exhaustive limitation, in the figures of the accompanying drawings, in which the same reference numerals refer to similar or identical elements. The elements of the drawings are not necessarily to scale relative to one another. The features of the various illustrated examples may be combined, unless they are mutually exclusive. Fig. Figure 1 shows a schematic illustration of a control device according to different embodiments. Fig. Figure 2 shows a schematic illustration of a control device according to different embodiments. Each of the Fig. Figures 3A to 3C illustrate a position-dependent control method according to various embodiments. Fig. Figure 4 illustrates how to determine a phase difference between parts of a control device according to different embodiments. Fig. Figure 5 shows a flowchart of a position-dependent control method according to different embodiments. DETAILED DESCRIPTION

[0009] The examples described herein provide a position-dependent control method and a device and system designed to execute the position-dependent control method.

[0010] In various embodiments, the position dependency can refer to a so-called inside-outside detection (IA detection; a detection of whether a device is located inside or outside a barrier-protected space).

[0011] Various implementations can provide control (e.g., of a function) based on whether a device (e.g., a UWB (ultra-wideband) transceiver) is detected inside or outside the accessible area. For example, the accessible area can be an enclosed space (e.g., of a house or a vehicle), and control of an opening and / or closing function can depend on whether a USB transceiver key is inside or outside the accessible area.

[0012] In various embodiments, IA detection is provided via two antennas and an RF switching element (in other words, an antenna switch). This can enable the use of a cost-effective / efficient UWB IC (integrated circuit) with a limited receive (RX) and / or transmit (TX) path.

[0013] In the control device according to various embodiments, a UWB transceiver can be used which has a single receive / transmit (RX / TX) path, and UWB shielding may not be required.

[0014] Figuratively speaking, a barrier that separates the inside from the outside can itself be used as a spatial separator, allowing a first antenna of the control device to be placed inside the barrier and a second antenna of the control device to be placed outside the barrier.

[0015] A switch can be used to activate either the first antenna or the second antenna for distance measurement (in the UWB-related standard IEEE 802.15.4 and the associated protocol, the respective distance measurement is also referred to as range measurement).

[0016] In various embodiments, a protocol implementation is provided to ensure the safe distance measurement process during the switching procedure.

[0017] Each of the Fig. 1 and Fig. Figure 2 shows a schematic illustration of a control device 100 according to various embodiments, and each of the Fig. Figures 3A to 3C illustrate a position-dependent control method according to various embodiments. The control device 100 of Fig. 1 or Fig. 2 or another control device according to various embodiments can be used to execute the control method of Fig. 3A to 3C can be used.

[0018] Furthermore, it shows Fig. 4 a control system 400 comprising a control device 100 according to various embodiments and a first UWB transceiver 440, wherein the first UWB transceiver 440 may be configured to transmit a UWB packet 446, 448, in particular a first part 446 of the UWB packet and a second part 448 of the UWB packet.

[0019] The control device 100 according to various embodiments includes a second UWB transmitter receiver 101, which includes a first antenna Ant1 designed to receive a first part 446 of the UWB packet from the first UWB transmitter receiver 440.

[0020] The first antenna Ant1 is located within a space protected by a barrier 150. The space protected by the barrier 150 can be any type of space for which it may be useful to define an "inside" and an "outside" and to perform an IA detection to determine whether the first UWB transceiver 440 is located inside or outside. The barrier 150 can, for example, form one or more walls, a floor, a roof, a window, and / or a door, which can be configured in various ways.

[0021] The second UWB transmitter 101 further includes a second antenna Ant2, which is designed to receive a second part 448 of the UWB packet from the first UWB transmitter 440, the second antenna Ant2 being located outside the space protected by the barrier 150.

[0022] The control device 100 further includes a processor 102, which is designed to determine a first distance between the first UWB transmitter 440 and the first antenna Ant1 from the first part 446 of the UWB packet and to determine a second distance between the first UWB transmitter 440 and the second antenna Ant2 from the second part 448 of the UWB packet.

[0023] In some embodiments, the distance determination process itself can be performed as a regular distance measurement process according to the IEEE 802.15.4z standard and protocol. Distance determination can be performed, for example, using round-trip time (RTT) determination (also known as two-way distance measurement), which measures the round-trip time of a signal transmitted, for example, from the first antenna Ant1 to antenna 442 of the first transceiver 440 and back to the first antenna Ant1, or, for example, from the second antenna Ant2 to antenna 442 of the first transceiver 440 and back to the second antenna Ant2.

[0024] In various embodiments, the round-trip time can be measured either from the first transceiver 440 or from the second transceiver 101, as long as it can be ensured that the resulting values ​​for the first and second distances are available in the second transceiver 101. Thus, results of a distance determination process originating from the first transceiver 440 can be transmitted to the second UWB transceiver 101 either in a dedicated transmission or as auxiliary data in a transmission serving a different purpose.

[0025] In various embodiments, instead of a round-trip time, an arrival time (TOA) measurement can be used for distance measurement, provided that synchronization is first performed between the first UWB transmitter 440 and the second UWB transmitter 101.

[0026] In various embodiments, a phase difference measurement, as in connection with Fig. 4 described, to determine the first distance and the second distance.

[0027] The processor 102 is further designed to compare a value of the first distance with a value of the second distance and to determine whether the first UWB transceiver 440 is located inside or outside the space protected by the barrier 150, by determining that the first UWB transceiver 440 is located inside the space protected by the barrier 150 if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver 440 is located outside the space protected by the barrier 150.

[0028] The processor 102 further includes a switch 112 designed to connect either the first antenna Ant1 or the second antenna Ant2 to the processor 101, for example, to a signal processing section of the processor 101, which may include, for example, an amplifier, e.g., a low-noise amplifier (LNA) 108, a mixer 108, a variable-gain amplifier (VGA) 112, an analog-to-digital converter (ADC) 114, a clock generator 116, and a subprocessor 104 for demodulating a digital baseband from its carrier frequency. In various embodiments, except where otherwise specified or implicitly indicated, the signal processing for distance determination may be carried out substantially as known in the prior art, and the processor 102 may include or consist of the respective known parts.

[0029] Various types of switches 112 can be used as the (RF) switch 112. For example, a so-called SPDT switch (Single Pole Double Throw) can be used. An SPDT switch can have two inputs (in this case, the first antenna Ant1 and the second antenna Ant2) and one output (here, the connection to the processor 102). The SPDT switch 112 can connect either the first antenna Ant1 or the second antenna Ant2 to the output. Since both antennas Ant1 and Ant2 can only be connected to one receiver section of the processor 102, an additional antenna AntTX may be required as a transmitting antenna. A corresponding embodiment is shown in Fig. 2 shown.

[0030] In various embodiments, a DPDT (Double Pole Double Throw) switch can be used as the switch 112. In this case, only two antennas Ant1 and Ant2 are required for signal reception (RX) and signal transmission (TX), since the switch can connect either the first antenna Ant1 or the second antenna Ant2 to the receiver section of the processor 102, and the other antenna Ant1 and the second antenna Ant2 to the transmit section of the processor 102. This transmit section can include, for example, amplifiers 118, such as a power amplifier, a preamplifier, and / or a pulse shaper, and phase-locked loop (PLL) components 120, such as for an all-digital phase-locked loop (ADPLL), which can essentially correspond to components known in the prior art. One embodiment is described in Fig. 1 shown.

[0031] The processor 102 may also include standard components such as a power management unit 106, a processor core 124 and an oscillator 122.

[0032] The processor 102 can be configured in various embodiments to execute the method according to different embodiments, for example to provide a trigger for the switch 112 and to analyze measured distance values.

[0033] The terms "first antenna" and "second antenna" are not intended to represent a sequence or ranking of the antennas. These terms primarily serve to facilitate differentiation between the two antennas. For the sake of simplicity, however, the first antenna is described herein as the antenna located within the barrier-free area, and the second antenna is described herein as the antenna located outside the barrier-free area. Although the procedure can be described as first determining the distance to the first antenna and then the distance to the second antenna, this can actually be done in reverse order.

[0034] Therefore, in various embodiments, switching between the first antenna Ant1 and the second antenna Ant2 can involve switching from the first antenna Ant1 to the second antenna Ant2 between receiving the first part 446 of the UWB packet and receiving the second part 448 of the UWB packet, or switching from the second antenna Ant2 to the first antenna Ant1 between receiving the second part 448 of the UWB packet and receiving the first part 446 of the UWB packet.

[0035] Each of the Fig. Sections 3A to 3C specify in their upper part a data structure for a data transmission according to an IEEE 802.15.4 standard protocol. The data structure for transmission according to the protocol typically includes an initial synchronization section (SYNC) to synchronize the communicating transmitters / receivers, a Start Frame Delimiter (SFD) that marks the beginning of a data frame, and the data transmission itself.

[0036] The UWB packet 446, 448 can contain an encrypted timestamp sequence (STS) signal.

[0037] The STS signal can be transmitted as a plurality of segments that may be separated by gaps.

[0038] Markers (specified as RMARKER and SRMARKERx (where x is a digit)) can be placed before each gap.

[0039] The data structure according to the IEEE-802.15.4 standard protocol offers various possibilities for switching between the first antenna Ant1 and the second antenna Ant2.

[0040] In various embodiments, data transmission between the first UWB transceiver 440 and the first antenna Ant1 can be completed (and optionally, the distance between the first UWB transceiver 440 and the first antenna Ant1 can be determined) before a trigger signal is sent to switch 112 to switch from the first antenna Ant1 to the second antenna Ant2, for which another complete data transmission is performed, including determining the distance between the first UWB transceiver 440 and the second antenna Ant2. Distance determination can, for example, be performed as one of the distance measurement processes described above. A corresponding embodiment is shown in Fig. 3A shown.

[0041] In various embodiments, data transmission between the first UWB transceiver 440 and the first antenna Ant1 can be initiated and followed until a gap occurs after one of the data segments (e.g., STS data segments), such as the first segment. The data transmitted up to this point may be sufficient to determine the distance between the first UWB transceiver 440 and the first antenna Ant1. During the gap, the trigger to activate switch 112 to switch from the first antenna Ant1 to the second antenna Ant2 can be sent, and data transmission continues after the gap with the subsequent (e.g., second) segment until data transmission is complete. Data transmission during the subsequent segment can enable the determination of the distance between the first UWB transceiver 440 and the second antenna Ant2.Distance determination can be carried out, for example, as one of the distance measurement processes described above. A corresponding embodiment is shown in [reference]. Fig. 3B shown (which has two parts, Fig. 3B - 1 / 2 and Fig. 3B - 2 / 2).

[0042] In various embodiments, data transmission between the first UWB transceiver 440 and the first antenna Ant1 can be initiated and tracked up to at least a portion of one of the data segments (e.g., STS data segments), such as the first segment. The data transmitted up to this point may be sufficient to determine the distance between the first UWB transceiver 440 and the first antenna Ant1. During the data transmission segment, for example, at a predefined specific time, a trigger can be sent to activate the switch 112 to switch from the first antenna Ant1 to the second antenna Ant2, and data transmission can continue with the remainder of the segment after the switchover. A corresponding embodiment is described in Fig. 3C shown. The timing of the switchover can be crucial; for example, it can be performed in the middle of the data transmission, e.g., of a data packet, for example, 32 µs after the Start Frame Delimiter (SFD).

[0043] Fig. Figure 4 illustrates determining a phase difference between parts of a control device according to different embodiments. The phase difference can be used in various embodiments (e.g., embodiments where switching occurs in a gap between two data segments or in a gap between synchronization and the first data segment; the phase difference method may not work with legacy packets (SP0)) instead of directly determining the first and second distances. Here, the distance between the first UWB transceiver 440 and only one of the antennas, e.g., the first antenna Ant1, can be determined, and the second distance can be determined from the first distance and a distance d between the first antenna Ant1 and the second antenna Ant2, as determined from a phase difference p between the first antenna Ant1 and the second antenna Ant2 and an arrival angle Φ.To determine the arrival phase difference (PDoA), in-phase (I) components, representing a component of the signal that is in phase with a reference signal, and quadrature (Q) components, representing the component of the signal that is 90 degrees out of phase with the reference signal, must be accessible for both data transmission parts, e.g., data packet parts, i.e., the data transmission part transmitted between the first UWB transceiver 440 and the first antenna Ant1, and the data transmission part transmitted between the first UWB transceiver 440 and the second antenna Ant2. A combination of I and Q components (also referred to as IQ data) can provide a complete representation of the signal in the complex plane, thus enabling the determination of amplitude and phase information and, from this, the phase difference p and the separation d.

[0044] The trigger signal to activate switch 112 for switching between the first antenna Ant1 and the second antenna Ant2 can be provided, for example, by a GPIO connector of processor 102. Since it may be important for data analysis that the switching occurs specifically within a gap or segment, precise timing may be required.

[0045] For example, the gaps can have a length of about 1 µs, which means that for an RF switching operation to be performed within a gap, the RF switching time must be less than 1,025 µs.

[0046] In various embodiments, the strict timing requirements may mean that the trigger signal is not provided by a control device 100, but rather must be provided by the digital baseband block 104 (this is shown in Fig. 3B is displayed). The trigger can be placed, for example, after the RMARKER or after the SRMARKER1.

[0047] Although it is described here that determining the first distance and determining the second distance and / or comparing the values ​​of the first distance and the second distance can be performed by the processor 102 of the second UWB transceiver 101 of the control device 100, it is clear that any or all of these functions can instead be performed in the first UWB transceiver 440 and that results can be transmitted to the second UWB transceiver 101.

[0048] The control device 100 may further include a (not shown) functional element which may be designed to control a function depending on a position determined for the first UWB transceiver 440.

[0049] For example, the functional element can include a lock that can enable or disable access to the space protected by the barrier 150, and an activation / disabling of the lock, which can be requested, for example, by the first UWB transceiver 440, can be granted or denied by the control device 100 based on whether it is determined that the first UWB transceiver 440 is inside or outside the space protected by the barrier 150.

[0050] A combination of the first UWB transceiver 440 and the control device 100 can be considered to form a control system.

[0051] Fig. Figure 5 shows a flowchart 500 of a position-dependent control method according to different embodiments.

[0052] The procedure involves receiving a first part 446 of the UWB packet from a first UWB transmit-receiver via a first antenna of a second UWB transmit-receiver, the first antenna being located within an accessible space (510), determining a first distance between the first UWB transmit-receiver and the first antenna from the first part 446 of the UWB packet (520), receiving a second part 448 of the UWB packet from the first UWB transmit-receiver via a second antenna of the second UWB transmit-receiver, the second antenna being located outside the accessible space (530), determining a second distance between the first UWB transmit-receiver and the second antenna from the second part 448 of the UWB packet (540), comparing a value of the first distance with a value of the second distance (550), and determining whether the first UWB transmit-receiver is located inside or outside the accessible space. space is located by determining,that the first UWB transmit receiver is located within the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transmit receiver is located outside the barrier-free space (560).

[0053] The following are several examples: Example 1 is a position-dependent control method. The method involves receiving a first part 446 of the UWB packet from a first UWB transceiver via a first antenna of a second UWB transceiver, where the first antenna is located within an accessible space; determining a first distance between the first UWB transceiver and the first antenna from the first part 446 of the UWB packet; receiving a second part 448 of the UWB packet from the first UWB transceiver via a second antenna of the second UWB transceiver, where the second antenna is located outside the accessible space; determining a second distance between the first UWB transceiver and the second antenna from the second part 448 of the UWB packet; comparing a value of the first distance with a value of the second distance; and determining whether the first UWB transceiver is located inside or outside the accessible space.by determining that the first UWB transceiver is located within the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-free space. In Example 2, the subject of Example 1 may optionally further include a switching between the first antenna and the second antenna, including a switching from the first antenna to the second antenna between receiving the first part 446 of the UWB packet and receiving the second part 448 of the UWB packet, or a switching from the second antenna to the first antenna between receiving the second part 448 of the UWB packet and receiving the first part 446 of the UWB packet. In Example 3, the subject of Example 1 or 2 may optionally further include the fact that the UWB packet 446, 448 contains an encrypted timestamp sequence (STS) signal. In Example 4, the subject of Example 3 may optionally further include the first part 446 of the UWB packet and / or the second part 448 of the UWB packet being provided and received as parts of at least one STS segment, with switching between the first antenna and the second antenna being performed during the reception of the UWB packet. In Example 5, the subject of Example 3 or 4 may optionally further include the switching between the first antenna and the second antenna being performed in a gap between STS segments, e.g., between a first STS segment and a second STS segment. In Example 6, the subject of Example 3 or 4 may optionally further include the switching between the first antenna and the second antenna being performed within an STS segment. In Example 7, the subject of one of Examples 1 to 6 may optionally further include the transmission of the received first part 446 of the UWB packet and the received second part 448 of the UWB packet along a common path between a switch for toggling between the first UWB antenna and the second UWB antenna and a processor for determining the first distance and the second distance. In Example 8, the object of one of Examples 1 to 7 may optionally further include a barrier of the barrier-free space that intersects a line of sight between the first antenna and the second antenna. In Example 9, the subject of one of Examples 1 to 8 may optionally further include controlling a function based on a result of determining that the first UWB transceiver is located within the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-free space. Example 10 is a control device. The control device includes a second UWB transceiver, comprising a first antenna designed to receive a first part 446 of the UWB packet from a first UWB transceiver, wherein the first antenna is located within a barrier-protected space, and a second antenna designed to receive a second part 448 of the UWB packet from the first UWB transceiver, wherein the second antenna is located outside the barrier-protected space, a processor designed to determine a first distance between the first UWB transceiver and the first antenna from the first part 446 of the UWB packet, to determine a second distance between the first UWB transceiver and the second antenna from the second part 448 of the UWB packet, to compare a value of the first distance with a value of the second distance and determinewhether the first UWB transceiver is located inside or outside the barrier-free space by determining that the first UWB transceiver is located inside the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-free space, and a switch designed to connect either the first antenna or the second antenna to the processor. In Example 11, the subject of Example 10 may optionally further include the fact that the switch is also designed to switch between the first antenna and the second antenna, including either switching from the first antenna to the second antenna between receiving the first part 446 of the UWB packet and receiving the second part 448 of the UWB packet, or switching from the second antenna to the first antenna between receiving the second part 448 of the UWB packet and receiving the first part 446 of the UWB packet. In Example 12, the subject of Example 10 or 11 may optionally further include that UWB packet 446, 448 of the UWB packet contains an encrypted timestamp sequence (STS) signal. In Example 13, the subject of one of Examples 10 to 12 may optionally further include the provision of the first part 446 of the UWB package and / or the second part 448 of the UWB package as parts of at least one STS segment. In Example 14, the subject of Example 12 or 13 may optionally further include the fact that the switch is designed to switch between the first antenna and the second antenna during reception of the UWB packet. In Example 15, the subject of Example 12 or 13 may optionally further include the fact that the switch is designed to switch between the first antenna and the second antenna within an STS segment. In Example 16, the subject of one of Examples 10 to 15 may optionally further include a common path between the switch and the processor, wherein the common path is designed to transmit the received first part 446 of the UWB packet and the received second part 448 of the UWB packet. In Example 17, the object of one of Examples 10 to 16 may optionally further include a barrier of the barrier-free space that intersects a line of sight between the first antenna and the second antenna. In Example 18, the subject of one of Examples 10 to 17 may optionally further include that the processor is also designed to control a function based on a result of determining that the first UWB transceiver is located within the barrier-protected space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-protected space. In Example 19, the subject of Example 18 may optionally also include the function of enabling access to the barrier-free space. Example 20 is a control system that includes the control device of one of Examples 10 to 19 and the first UWB transceiver.

[0054] Although specific examples are illustrated and described herein, it will be clear to those skilled in the art that a variety of alternative and / or equivalent implementations can be substituted for the specific examples shown and described without altering the scope of the present invention. This application is intended to cover all adaptations or variations of the specific examples discussed herein. Therefore, this invention is intended to be limited only by the claims and their equivalents.

[0055] It should be noted that the methods and devices, including their preferred embodiments, as outlined in this document, can be used independently or in combination with other methods and devices disclosed herein. Furthermore, the features described in connection with a device are also applicable to a corresponding method, and vice versa. Moreover, all aspects of the methods and devices described in this document can be combined as desired. In particular, the features of the claims can be combined with one another as desired.

[0056] It should be noted that the description and drawings merely illustrate the principles of the proposed methods and systems. Those skilled in the art are able to implement various arrangements which, although not expressly described or shown herein, embody the principles of the invention and are contained within its concept and scope of protection. Furthermore, all examples and embodiments presented in this document are expressly intended to serve only explanatory purposes, to facilitate the reader's understanding of the principles of the proposed methods and systems. Moreover, all statements herein that provide principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to include their equivalents. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2022 / 253949 A1

[0003] Cited non-patent literature

[0000] UWB connected standard IEEE 802.15.4

[0015]

Claims

[1] Position-dependent control method, comprising: • Receiving a first part of the UWB packet from a first UWB transceiver via a first antenna of a second UWB transceiver, the first antenna being located within an accessible space; • Determining an initial distance between the first UWB transceiver and the first antenna from the first part of the UWB packet; • Receiving a second part of the UWB packet from the first UWB transmitter-receiver via a second antenna of the second UWB transmitter-receiver, the second antenna being located outside the barrier-protected space; • Determining a second distance between the first UWB transceiver and the second antenna from the second part of the UWB packet; • Comparing a value from the first distance with a value from the second distance; • Determine whether the first UWB transmit receiver is inside or outside the barrier-free space by determining that the first UWB transmit receiver is inside the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transmit receiver is outside the barrier-free space. [2] Control method according to claim 1, further comprising: a switching between the first antenna and the second antenna, including a switching from the first antenna to the second antenna between receiving the first part of the UWB packet and receiving the second part of the UWB packet, or a switching from the second antenna to the first antenna between receiving the second part of the UWB packet and receiving the first part of the UWB packet. [3] Control method according to claim 1 or 2, wherein the UWB packet 446, 448 includes an encrypted timestamp sequence (STS) signal. [4] Control method according to claim 3, wherein the first part of the UWB packet and / or the second part of the UWB packet are provided and received as parts of at least one STS segment, wherein switching between the first antenna and the second antenna is performed during the reception of the UWB packet. [5] Control method according to claim 3 or 4, wherein the switching between the first antenna and the second antenna is performed in a gap between STS segments. [6] Control method according to claim 3 or 4, wherein the switching between the first antenna and the second antenna is performed within an STS segment. [7] Control method according to any one of claims 1 to 6, wherein the received first part of the UWB packet and the received second part of the UWB packet are sent along a common path between a switch for switching between the first UWB antenna and the second UWB antenna and a processor for determining the first distance and the second distance. [8] Control method according to any one of claims 1 to 7, wherein a barrier of the barrier-protected space intersects a line of sight between the first antenna and the second antenna. [9] Control method according to any one of claims 1 to 8, further comprising: Controlling a function based on the result of determining that the first UWB transceiver is located within the barrier-free space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-free space. [10] Control device comprising: • a second UWB transceiver, comprising: ◯ a first antenna designed to receive a first part of the UWB packet from a first UWB transceiver, wherein the first antenna is located within an accessible space; and ◯ a second antenna designed to receive a second part of the UWB packet from the first UWB transmit-receiver, the second antenna being located outside the barrier-protected space; • a processor that is designed to: ◯ to determine an initial distance between the first UWB transceiver and the first antenna from the first part of the UWB packet; ◯ to determine a second distance between the first UWB transmit-receiver and the second antenna from the second part of the UWB packet; ◯ to compare a value of the first distance with a value of the second distance; and ◯ to determine whether the first UWB transmit / receiver is located inside or outside the accessible space by determining that the first UWB transmit / receiver is located inside the accessible space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transmit / receiver is located outside the accessible space; and • a switch designed to connect either the first antenna or the second antenna to the processor. [11] Control device according to claim 10: wherein the switch is further designed to switch between the first antenna and the second antenna, including either switching from the first antenna to the second antenna between receiving the first part of the UWB packet and receiving the second part of the UWB packet, or switching from the second antenna to the first antenna between receiving the second part of the UWB packet and receiving the first part of the UWB packet. [12] Control device according to claim 10 or 11, wherein the UWB packet 446, 448 includes an encrypted timestamp sequence (STS) signal. [13] Control device according to one of claims 10 to 12, wherein the first part of the UWB packet and / or the second part of the UWB packet are provided as parts of at least one STS segment. [14] Control device according to claim 12 or 13, wherein the switch is designed to switch between the first antenna and the second antenna in a gap between STS segments. [15] Control device according to claim 12 or 13, wherein the switch is designed to switch between the first antenna and the second antenna within an STS segment. [16] Control device according to any one of claims 10 to 15, further comprising: a common path between the switch and the processor, the common path being designed to transmit the received first part of the UWB packet and the received second part of the UWB packet. [17] Control device according to one of claims 10 to 16, wherein a barrier of the barrier-protected space intersects a line of sight between the first antenna and the second antenna. [18] Control device according to one of claims 10 to 17, wherein the processor is further configured to control a function based on a result of determining that the first UWB transceiver is located within the barrier-protected space if a result of the comparison indicates that the first distance is less than the second distance, and that otherwise the first UWB transceiver is located outside the barrier-protected space. [19] Control device according to claim 18, wherein the function includes enabling access to the barrier-free space. [20] Control system, comprising: • the control device according to any one of claims 10 to 19; and • the first UWB transceiver.

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