Beacon receiving device and beacon receiving method

Abstract

To make it possible to improve a reception probability by reducing radio wave reception failures and also to stabilize the radio wave intensity of received radio waves, particularly even when using a battery-less beacon.SOLUTION: A beacon receiving device 10 receives radio waves of a plurality of frequencies emitted by a BLE beacon. The receiving device 10 includes a plurality of receivers 12A to 12C. The plurality of receivers 12A to 12C are dedicated receivers for respective radio waves that receive radio waves of specific frequencies assigned among the radio waves of the plurality of frequencies emitted by the beacon for each of the receivers 12A to 12C. The plurality of receivers 12A to 12C receive the radio waves of the plurality of frequencies by simultaneously opening reception windows for receiving the radio waves of the specific frequencies assigned to them.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an improvement to a beacon receiving device and receiving method for receiving radio waves of multiple frequencies transmitted by a BLE (Bluetooth (registered trademark) Low Energy: hereinafter referred to as "BLE" in this specification) beacon, and in particular to reducing missed radio wave reception and realizing stabilization of radio wave strength indicator (RSSI) even for battery-less beacons, which have a longer radio wave transmission interval compared to battery-powered beacons. [Background technology]

[0002] Recently, BLE beacons have been used to process various types of information wirelessly. Specifically, for example, in indoor facilities where GPS signals cannot reach, they are used to measure the distance to an object from the strength of the received radio waves, and to determine the object's position from this measured distance. They are also used to issue coupons to users, provide information about various facilities, and, most recently, to check for contact with close contacts of people infected with the new coronavirus.

[0003] These BLE beacons transmit packets at specified intervals on the advertising channel to announce their own information as peripheral devices, which are then scanned (connection requests) by surrounding central devices, who then receive the information transmitted by the peripheral devices at a receiver such as a gateway.

[0004] In this case, BLE performs advertising using the 2.4 GHz frequency band, which is a frequency band that can generally be used as the IMS (Industry, Science, and Medical) band. More specifically, to avoid interference with Wi-Fi (registered trademark), which also uses the same 2.4 GHz band, three specific frequency channels, 37 ch (2402 MHz), 38 ch (2426 MHz), and 39 ch (2480 MHz), out of a total of 40 channels in the 2.4 GHz band. A BLE beacon, as a peripheral device, transmits these three frequency channels in one advertising transmission (one beacon signal), as shown in Figure 5.

[0005] On the other hand, in a receiving device such as a gateway device equipped with a receiver such as a gateway that is a central device, conventionally, only one receiver and one antenna are installed in one receiving device, and multiple frequency channels are received using this one receiver and one antenna (see, for example, Patent Document 1, particularly Figures 5a, 5b, 9a, and 9b). For this reason, in a conventional receiving device, when receiving this advertising transmission, as shown in Figure 5, in one receiver, a reception window for receiving radio waves is opened periodically for a set time at predetermined intervals for each reception window of 37ch, 38ch, and 39ch, and communication is performed by receiving the frequency channel whose open reception window matches the transmission channel.

[0006] Therefore, depending on the timing of transmission and reception of radio waves of each frequency, radio wave reception may be missed. For example, if the reception window for 37ch is open and only radio waves of frequencies 38ch and 39ch are arriving at the receiving device, the radio waves of these frequencies, as well as 37ch, which is not being received, cannot be received, resulting in radio wave reception misses.

[0007] This problem may not be a major problem if the battery-powered beacon has a relatively short radio wave transmission interval, as shown in Figure 5(A), as it may be possible to receive multiple advertising transmissions (multiple times) when the reception window for a certain channel is open, and it may be possible to receive a channel with a frequency that matches the open reception window (for example, in the case of the battery-powered beacon in Figure 5(A), the number of matches shown in the solid boxes is one for channel 37, two for channel 38, and one for channel 39, for a total of four matches).

[0008] However, particularly when the BLE beacon is a battery-less beacon (a beacon powered by energy harvesting, powered by external environmental factors such as vibrations and lighting), it stores electricity in an internal capacitor before transmitting radio waves, which inevitably necessitates a longer radio wave transmission interval compared to a battery-powered beacon, as shown in Figure 5. Therefore, compared to a battery-powered beacon, the number of matches and reception probability between radio waves of the channel frequency received by the receiving device and the reception window that is open at that time are inevitably lower, and this missed signal problem can become a major obstacle to reception performance. (For example, in the case of the battery-less beacon in Figure 5(B), the number of matches (filled in) is zero for channel 37, one for channel 38, and one for channel 39, for a total of two matches. As shown in Figure 5(B), if the number of transmissions is half that of a battery-powered beacon, the number of matches and reception probability may also be about half that of an electronic beacon.)

[0009] Furthermore, because the wavelengths of the channels 37 (2402 MHz), 38 (2426 MHz), and 39 (2480 MHz) are slightly different, the interference caused by radio wave reflection, refraction, and scattering also differs for each channel. Therefore, the radio wave strength (RSSI) measured when receiving signals from each channel varies depending on the reception conditions (reception environment). Conventionally, when a single receiver receives only radio waves from a specific channel, the radio wave from that channel is not necessarily the strongest among the three channels. This can lead to the risk of missing radio waves from channels with better reception conditions. Furthermore, when receiving radio waves from different channel frequencies with different radio wave strengths each time the reception window changes, the radio wave strength can vary. This issue is particularly desirable when detecting distance and location information using BLE beacons, as mentioned above, because distance and location are often measured by converting the radio wave strength of the received radio waves. Therefore, stabilizing this radio wave strength has been desired for some time. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Special Publication No. 2019-512175 Summary of the Invention [Problem to be solved by the invention]

[0011] In view of the above problems, the problem that the present invention aims to solve is to provide a beacon receiving device and a beacon receiving method that can reduce missed radio wave reception and improve reception probability, even in the case of a battery-less beacon, and can stabilize the radio wave intensity of the received radio waves. [Means for solving the problem]

[0012] (1. Beacon receiving device) As a first means for solving the above-mentioned problems, the present invention provides a beacon receiving device that receives radio waves of multiple frequencies transmitted by a BLE beacon, the receiving device including three receivers and three dedicated antennas corresponding to the three receivers, each of which is a dedicated receiver for receiving radio waves of a specific frequency assigned to it from the radio waves of the multiple frequencies transmitted by the beacon, and the dedicated antennas corresponding to the receiver receive the radio waves of the specific frequency assigned to it, and the three receivers simultaneously open reception windows for receiving the radio waves of the specific frequency assigned to each of the three receivers to receive the radio waves of the multiple frequencies, and the distances between the three dedicated antennas are all set to be equal to each other. Among the radio waves of multiple frequencies received by the three receivers, the radio wave with the greatest radio wave intensity is regarded as the received radio wave. The present invention provides a beacon receiving device characterized by the above.

[0013] The present invention is a first method for solving the above problems. 2 As a means of 1 of The solution provides a beacon receiving device characterized in that all three dedicated antennas are installed at equal intervals of 6 cm to 6.50 cm from each other.

[0014] The present invention is a first method for solving the above problems. 3 As a means of 1 or 3 In any one of the solutions, a beacon receiving device is provided, characterized in that the three receivers receive radio waves transmitted by the battery-less beacon.

[0015] (2. How to receive beacons) The present invention also provides the first to third 3 The present invention also provides a beacon receiving method for receiving a beacon using a receiving device that is a means for solving the above problem. 4As a means for the above, a beacon receiving method in which radio waves of multiple frequencies transmitted by a BLE beacon are received by a receiving device, the receiving device is provided with three receivers and three dedicated antennas corresponding to each of these three receivers, the distances between each of these three dedicated antennas are all set to be equal to each other, each receiver receives radio waves of a specific frequency assigned to it out of the radio waves of multiple frequencies transmitted by the beacon, making the three receivers dedicated receivers for each radio wave, the radio waves of the specific assigned frequency are received by the dedicated antennas corresponding to the receivers, and a receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers is opened simultaneously to receive radio waves of the multiple frequencies. Among the radio waves of multiple frequencies received by the three receivers, the radio wave with the greatest radio wave strength is determined as the received radio wave. The present invention provides a beacon receiving method characterized by:

[0016] The present invention is a first method for solving the above problems. 5 As a means of of 4 The solution provides a beacon receiving method characterized in that three dedicated antennas are all installed at equal intervals of 6 cm to 6.50 cm from each other.

[0017] The present invention is a first method for solving the above problems. 6 As a means of 4 or No. 5 In any one of the above solutions, a beacon receiving method is provided, characterized in that radio waves transmitted by a battery-less beacon are received by three receivers. [Effects of the Invention]

[0018] According to the present invention, as described above, a plurality of receivers, specifically three receivers, are installed in the beacon receiving device, and rather than simply installing three receivers, these three receivers are dedicated to each receiver to receive radio waves of a specific frequency assigned to it from the radio waves of the multiple frequencies (each channel) transmitted by the beacon, and further, the multiple receivers simultaneously open reception windows for receiving radio waves of the specific frequency assigned to each of them to receive radio waves of multiple frequencies. Therefore, regardless of the state in which radio waves of any frequency reach the receiver, when the reception window is open, radio waves of at least one of the frequencies can be received, which has the practical benefit of reducing radio wave misses and improving the probability of receiving radio waves.

[0019] Furthermore, according to the present invention, as described above, the radio wave with the greatest radio wave strength among the radio waves of multiple frequencies received by the three receivers via the three dedicated antennas is used as the received radio wave. Therefore, each time radio waves of multiple frequencies are received in the reception window, the signal can be processed using the radio wave of the frequency with the greatest radio wave strength. Therefore, each time reception is performed, it is possible to switch to the radio wave with the greatest radio wave strength without being affected by the radio wave strength of the received radio wave, and there is the practical benefit of being able to stably maintain high radio wave strength and more accurately process location information, etc.

[0020] Furthermore, according to the present invention, as described above, three corresponding antennas are installed for each dedicated receiver, and the dedicated antennas corresponding to the receiver receive radio waves of the specific frequency assigned to each of the three receivers, which has the practical benefit of allowing each receiver to more efficiently receive radio waves of the specific frequency assigned to it, thereby stabilizing reception.

[0021] In this case, particularly according to the present invention, these three dedicated antennas are all installed at equal intervals of 6 cm to 6.50 cm from each other. This interval is approximately half the distance of approximately 12.5 cm, which is the wavelength of 2.4 GHz, the frequency used by BLE. Therefore, by arranging the three antennas at equal intervals from each other, it is possible to prevent the effects of multipath fading, which occurs when radio waves on different paths interfere with each other due to reflection, refraction, and scattering of radio waves, causing fluctuations in radio wave strength. This means that radio waves can be reliably received without being affected by the distance from the beacon, the orientation of the beacon, or the radio wave reflection conditions, resulting in the practical benefit of improving the reception probability.

[0022] In addition, according to the present invention, even in the case of a battery-less beacon in which the beacon (transmitter) stores electricity in an internal capacitor before transmitting radio waves, resulting in a relatively long radio wave transmission interval, as described above, it is possible to improve the reception probability and maintain high radio wave strength to stabilize reception, which has the practical benefit of being able to improve reception probability and maintain high radio wave strength. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a schematic diagram showing an example of installation of a beacon receiving device of the present invention and a state in which a beacon receiving method is implemented using the beacon receiving device of the present invention. [Figure 2] 1 is a schematic diagram illustrating the configuration of a beacon receiving device according to the present invention. [Figure 3] 1 is a diagram showing an installation state of a plurality of antennas used in a beacon receiving device of the present invention. [Figure 4] 10 is a diagram showing the timing of transmission and reception with a battery-less beacon in the beacon receiving device and receiving method of the present invention. FIG. [Figure 5] 1A and 1B are diagrams showing the timing of beacon transmission and reception in a conventional beacon receiving device and receiving method, where FIG. 1A shows the timing of transmission and reception in an electronic beacon, and FIG. 1B shows the timing of transmission and reception in a battery-less beacon. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 shows a state in which a beacon 1 receiving method is implemented using a beacon 1 receiving device 10 of the present invention. As shown in Figure 1, the receiving device 10 of the present invention can be installed, for example, in multiple locations indoors, and can be used to measure the position of a beacon 1 carried by an object by receiving radio waves of multiple frequencies emitted by a BLE beacon 1 (beacon transmitter) carried by the object and locating the distance to the beacon 1.

[0025] As shown in Figure 1, the system used for this transmission and reception method is composed of a BLE beacon 1 (beacon transmitter) equipped on the target and a beacon receiver 10 that receives radio waves of multiple frequencies emitted by this BLE beacon 1.

[0026] (1. Beacon) A conventional beacon 1 (transmitter) can be used, and the radio waves transmitted by this beacon 1 are three specific frequency channels, 37ch (2402MHz), 38ch (2426MHz), and 39ch (2480MHz), assigned for BLE, out of a total of 40 channels in the 2.4GHz band. As a peripheral device, beacon 1 transmits these three frequency channels with one advertisement transmission (one beacon signal), as shown in Figures 4 and 5. Specifically, examples of such beacons 1 include dedicated beacon transmitters, as well as smartwatches, health devices, and lost item tags, depending on the application.

[0027] In this case, it is particularly noteworthy that, in the present invention, even when a battery-less beacon 1 is used as the beacon 1, i.e., a beacon 1 that does not have its own power source but is powered by an environmentally-powered energy harvester that is powered by influences from the external environment, as shown in Figures 4 and 5, the beacon 1 can contribute to stabilizing the reception probability and radio wave strength. More specifically, an example of this battery-less beacon 1 is one that generates power from vibrations generated by a person walking. In the case of this vibration-powered beacon 1, for example, it can be worn by a person or attached to a moving object to be located in a facility such as a building or a large ship, and used to locate the target person or object, or worn by a child, etc., to locate the child's location. Furthermore, for example, it can be powered by photovoltaic power generation from lighting installed in a factory, etc., and similarly used to locate moving objects moving within the factory.

[0028] (2. Receiving device) On the other hand, the receiving device 10 that receives the radio waves transmitted from this beacon 1 is equipped with a receiver 12 as shown in Figure 2, and as a central device, this receiver 12 opens a receiving window for a predetermined time at a predetermined interval as shown in Figure 4, and receives the radio waves that reach the receiving window by scanning (requesting connection) the advertisements transmitted by the beacon 1 as a peripheral device.

[0029] A gateway device can be cited as an example of this receiving device 10. Specifically, for example, as shown in Fig. 1, a plurality of gateway devices as receiving devices 10 are installed in a facility, and as shown in Fig. 2, these gateway devices as receiving devices 10 are connected to a central management system 2 by wire or wirelessly, and the gateway devices as receiving devices 10 receive radio waves transmitted from a beacon 1, and the received radio waves are signal-processed and transmitted to the central management system 2, and the central management system 2 measures the distance between the beacon 1 and the plurality of gateway devices as receiving devices 10 from the radio wave intensity of the radio waves received by the receiving device 10 (the received radio wave intensity is converted into distance), and further, the distance can be used for information processing to detect the position of a target person or object equipped with the beacon 1 from the distance.

[0030] In this case, the gateway device, which is a receiving device 10 for determining the distance to such an object or the object's position, can be installed in locations such as to determine the positions of workers in a factory, doctors and patients in a hospital, store clerks and customers in a store, and even crew members on board a large ship, and ultimately to avoid danger and analyze the behavior of the object through this positioning.In addition, the gateway device can be installed outdoors, such as at school gates or on school routes, and used to determine the current position of children in order to keep an eye on them.

[0031] However, the receiving device 10 of the present invention is not limited to such a dedicated gateway device, and its use and installation location are not particularly limited. For example, as long as a BLE beacon 1 is used, a smartphone, a personal computer, or a peripheral device thereof can be used as the receiving device 10, which serves as a central device, to provide guidance, award points, and coupons at facilities such as stores, tourist spots, museums, train stations, and airports. In this case, a beacon 1 that transmits radio waves according to the purpose is installed at each facility, and advertisements are scanned by a receiving device 10, which serves as a central device such as a smartphone, located in the vicinity. It can also be used for evacuation guidance during disasters, checking school attendance, and so on. Thus, the receiving device 10 and receiving method of the present invention are not particularly limited in use or installation location as long as the receiving device 10 is for a system that transmits and receives a BLE beacon 1, and can be widely applied to information processing systems in general that use beacons 1.

[0032] Therefore, the receiving device 10 of the present invention, like the previous receiving device 10, can perform advertisement scanning of beacons 1 as multiple peripheral devices, and can also simultaneously receive multiple advertisements, which are broadcast communications emitted by multiple beacons 1.

[0033] (3. Multiple receivers) In the present invention, the receiving device 10 includes a plurality of receivers 12A to 12C, as shown in Fig. 2. Each of the plurality of receivers 12A to 12C is provided as a dedicated receiver for receiving radio waves of a specific assigned frequency among the radio waves of the plurality of frequencies transmitted by the beacon 1. More specifically, for example, the receiver 12A is a receiver dedicated to channel 37, the receiver 12B is a receiver dedicated to channel 38, and the receiver 12C is a receiver dedicated to channel 39. Therefore, each of the receivers 12A to 12C does not function as three receivers that receive all channels (i.e., it does not simply increase the number of receivers), but functions as a receiver that receives only the radio waves of the channel that is assigned to it.

[0034] Each of these receivers 12A to 12C has a receive window for receiving radio waves of a specific frequency assigned to it, i.e., in the above example, receiver 12A has a receive window for receiving channel 37, receiver 12B has a receive window for receiving channel 38, and receiver 12C has a receive window for receiving channel 39. Unlike the conventional receiver shown in Fig. 5, the receive windows of these receivers 12A to 12C do not open sequentially for a predetermined time at predetermined intervals for each of the receivers 12A to 12C, but as shown in Fig. 4, all of the receive windows of the receivers 12A to 12C open simultaneously. In this case, these receive windows can be set at the installation location of the receiving device 10 to open simultaneously at appropriate intervals corresponding to the transmission interval of the radio waves of the beacon 1 to be received, and for an appropriate predetermined time corresponding to the transmission interval of the radio waves of the beacon 1.

[0035] Therefore, if beacon 1 transmits three radio waves on channels 37, 38, and 39 in one advertising transmission (one beacon signal), regardless of the channel of the radio waves that arrive at receiving device 10 when the receiving window is open, the radio waves will always be received because all receiving windows are open at the same time. As a result, in the conventional receiving device shown in Figure 5, even if radio waves on channels 38 and 39 arrive at receiving device 10 when the receive window for channel 37 is open, the radio waves on these channels cannot be received because the receive windows for channels 38 and 39 are not open, resulting in a missed reception.In contrast, in the present invention, for example, as shown in the reception state at the left end of Figure 4, even if the receive windows are open and only radio waves on channels 38 and 39 arrive at receiving device 10 (channels shown filled in in Figure 4), all receive windows for channels 37 to 39 are open at the same time, so the transmit and receive channels and receive windows match, the timing is synchronized, and the radio waves on the channels that arrive at receiving device 10 can be received without fail.

[0036] Therefore, in the present invention, the beacon 1 is a battery-less beacon with a relatively long transmission interval, and as shown in Figures 4 and 5(B), the number of times that the open timing and the timing for receiving radio waves match is at least, so that radio waves can be reliably received with the few reception opportunities, reducing missed radio waves and improving the probability of receiving radio waves.

[0037] (4. Multiple Antennas) Furthermore, in the present invention, the receiving device 10 has multiple dedicated antennas 14A to 14C corresponding to multiple receivers 12A to 12C, respectively, as shown in Figures 2 and 3. As shown in Figure 2, the multiple receivers 12A to 12C receive radio waves of specific assigned frequencies using the dedicated antennas 14A to 14C corresponding to the receivers 12A to 12C. That is, as shown in Figure 2, the receiver 12A dedicated to channel 37 receives radio waves of channels 37, 38, and 39 assigned to it using the antenna 14A dedicated to channel 37, the receiver 12B dedicated to channel 38 receives radio waves using the antenna 14B dedicated to channel 38, and the receiver 12C dedicated to channel 39 receives radio waves of channels 37, 38, and 39 assigned to it, respectively. This allows each of the receivers 12A to 12C to more efficiently receive radio waves of the specific frequency assigned to it, thereby stabilizing reception.

[0038] 2 and 3, these dedicated antennas 14A to 14C are installed at predetermined intervals, specifically, at intervals of 6 cm to 6.50 cm, between adjacent dedicated antennas 14A to 14C. In this case, as shown in Fig. 3, the intervals between antenna A and antenna B, between antenna B and antenna C, and between antenna C and antenna A in Fig. 3 can all be set to 6 cm to 6.50 cm so that the distances between each of the dedicated antennas 14A to 14C are all equal to one another. Alternatively, as shown in Fig. 2, the intervals between adjacent dedicated antennas 14A to 14C can simply be set to 6 cm to 6.50 cm, i.e., if the intervals between antenna A and antenna B and between antenna B and antenna C in Fig. 2 are 6 cm to 6.50 cm, the distance between non-adjacent antennas C and A can be set to 12 cm to 13 cm.

[0039] This interval between 6 cm and 6.50 cm is approximately half the length of the wavelength of 2.4 GHz, which is approximately 12.5 cm, the frequency used by BLE, so by arranging multiple antennas 14A to 14C at these intervals, it is possible to prevent the reception status from being affected by fluctuations in radio wave strength caused by interference between radio waves that take different paths due to reflection, refraction, and scattering of radio waves (multipath fading), and to reliably receive radio waves without being affected by the distance to the beacon 1, the orientation of the beacon 1, or the radio wave reflection conditions, thereby improving the reception probability. In this case, it is most preferable to set the interval to 6.25 cm, which is half the BLE wavelength of 12.5 cm. However, as long as the interval is within the above-mentioned range of 6 cm to 6.50 cm, which is 0.25 cm around the median value, reception will be possible without any problems because the difference is in the millimeter range.

[0040] (5. Radio wave strength) Furthermore, in the present invention, the radio wave with the greatest radio wave intensity among the radio waves of multiple frequencies received by the multiple receivers 12A to 12C is determined to be the received radio wave. Specifically, for example, when the first receive window is open at the left end of Figure 4, the radio waves of 38ch and 39ch (filled in) are shown to be received by the receive window, and of the radio waves of 38ch and 39ch received by these receive windows, the radio wave with the higher radio wave intensity (RSSI) is adopted as the received radio wave. Similarly, when the second receive window is open at the center of Figure 4, the radio waves of 37ch and 38ch (filled in) are shown to be received by the receive window, and of the radio waves of 37ch and 38ch received by these receive windows, the radio wave with the higher radio wave intensity (RSSI) is adopted as the received radio wave. Similarly, when the third receiving window at the right end of Figure 4 is open, it is shown that all radio waves from channels 37 to 39, which are filled in, are received by the receiving window, but of all the radio waves from channels 37 to 39 received by these receiving windows, the radio wave with the highest radio wave strength (RSSI) is adopted as the received radio wave.

[0041] This allows reception to be switched to maximum radio wave strength each time radio waves are received from beacon 1, and reception at high radio wave strength at all times, thereby preventing fluctuations in the radio wave threat level each time reception occurs when the radio waves received due to a coincidental match are not at maximum strength, as occurs with the conventional receiving device and receiving method shown in Fig. 5. Therefore, each time radio waves of multiple frequencies are received in the reception window, the signal can be processed using the radio wave of the frequency with the maximum radio wave strength, and therefore, each time reception occurs, the signal can be switched to radio waves with the maximum radio wave strength without being affected by the radio wave strength of the received radio waves, and high radio wave strength can be stably maintained, allowing for more accurate and precise processing of location information, etc. [Industrial Applicability]

[0042] The present invention is not limited to any particular use or installation location as long as it is a receiving device for a system that transmits and receives BLE beacons, for example, for measuring the distance to an object or detecting the object's position, and can generally be widely applied to information processing systems that use beacons. [Explanation of symbols]

[0043] 1 Beacon 2. Central Management System 10 Receiving device 12 Receivers 12A 37ch dedicated receiver 12B 38ch dedicated receiver 12C 39ch dedicated receiver Dedicated antenna for 14A 37ch Dedicated antenna for 14B 38ch Dedicated antenna for 14C 39ch

Claims

1. A beacon receiving device that receives radio waves of multiple frequencies transmitted by a beacon for BLE (Bluetooth (registered trademark) Low Energy), the receiving device comprising three receivers and three dedicated antennas corresponding to each of the three receivers, the three receivers being dedicated receivers for each of the radio waves to receive radio waves of a specific frequency assigned to it from the radio waves of the multiple frequencies transmitted by the beacon, the radio waves of the specific frequency assigned to each of the three receivers being received by the dedicated antennas corresponding to each of the receivers, the three receivers simultaneously opening reception windows for receiving radio waves of the specific frequency assigned to each of the three receivers to receive the radio waves of the multiple frequencies, the distances between each of the three dedicated antennas being set to be equal to each other, and the radio wave of the multiple frequencies received by the three receivers being the radio wave with the greatest radio wave intensity being the received radio wave.

2. A beacon receiving device as described in claim 1, characterized in that all three dedicated antennas are installed at equal intervals of 6 cm to 6.50 cm from each other.

3. 3. The beacon receiving device according to claim 1, wherein the three receivers receive radio waves transmitted by a battery-less beacon.

4. a receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers; a receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers; a receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers; and a receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers. The receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers is simultaneously opened to receive the radio waves of the specific frequency assigned to each of the three receivers. The receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers is simultaneously opened to receive the radio waves of the specific frequency assigned to each of the three receivers. The receiving window for receiving the radio waves of the specific frequency assigned to each of the three receivers is the radio wave with the greatest radio wave intensity among the radio waves of the multiple frequencies received by the three receivers.

5. A method for receiving a beacon as described in claim 4, characterized in that each of the three dedicated antennas is installed at equal intervals of 6 cm to 6.50 cm from each other.

6. A method for receiving a beacon as described in either claim 4 or claim 5, characterized in that the three receivers receive radio waves emitted by a battery-less beacon.

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