Receiver for real-time location system and real-time location system using same

Abstract

The present invention provides a receiver for a real-time location system and a real-time location system using same, the receiver comprising: a housing; an antenna provided on the upper side of the housing and receiving radio waves, transmitted from a transmitter, only through one side thereof while rotating 360° around an axis which is on a vertical line in the vertical direction; and a drive control unit provided on the lower side of the housing and controlling the driving of the antenna, wherein, while rotating the antenna of the receiver 360°, three sides among the four sides of the antenna are shielded by a shielding member, and thus interference radio waves reflected from an indoor wall surface or obstacle may be blocked, and radio waves transmitted from the transmitter may be received only through the remaining one side, and thus precision of indoor positioning may be improved, and additionally, interference from the interference radio waves may be minimized.

Description

Receiver for real-time location tracking system and real-time location tracking system using the receiver

[0001] The present invention relates to a receiver for a real-time location tracking system and a real-time location tracking system using the receiver, and more specifically, to a receiver for a real-time location tracking system capable of recognizing in real time the two-dimensional absolute position of logistics equipment in a logistics workspace where a plurality of transmitters are arranged at regular intervals, and a real-time location tracking system using the receiver.

[0002] In general, a real-time location system (RTLS) refers to a system that provides various services through real-time location information of objects.

[0003] Currently, RTLS systems are being used in various fields related to the Internet of Things (IoT), such as logistics, healthcare, and production facilities.

[0004] Typically, 'Real-time Location Systems' (RTLS) are a general term for positioning and tracking systems in confined spaces such as short distances and indoors, and are also called Indoor Positioning Systems (IPS) because they are primarily utilized in confined spaces.

[0005] When loading a variety of products and materials in an indoor logistics warehouse, if you fail to properly check which items are stored in which locations, you cannot avoid significant losses in terms of time, cost, and manpower.

[0006] Therefore, many companies are investing a lot of money to efficiently manage their logistics warehouses. If a real-time location tracking system (RTLS) is applied to an indoor logistics warehouse management system, it will be possible to identify the exact location of items stored in real time, and it will be possible to manage all of the loading, removal, and movement of items using transport devices such as forklifts.

[0007] For unmanned logistics transport equipment used in indoor logistics work environments, RTLS (Real-Time Location and Mapping) technology is important, and for this purpose, it can be classified as follows depending on the sensors installed.

[0008] Depth RTLS (ToF) is a ToF sensor that illuminates a target with laser light and measures distance from the time it takes for the laser light to reflect. Because it performs distance measurement using laser illumination, it can measure even in low-light environments.

[0009] And Visual RTLS (HD camera) is an RTLS technology that uses camera images. It measures the distance to the target from image data, performs self-location estimation and map creation, and the camera has the advantage of reducing RTLS implementation costs at a relatively low cost.

[0010] Additionally, since a lot of information, such as obstacle and person recognition, can be obtained from image information, it has the advantage of being usable for purposes other than self-location estimation.

[0011] However, when calculating distance from image data, there is a weakness in obtaining distance in environments where there is little change in color, such as in the same scenery, as changes in the angle or brightness of the object are required.

[0012] LiDAR RTLS (Lidar) is a RTLS technology that uses LiDAR. Like a time-of-flight sensor, LiDAR projects laser light and measures the distance until the light reflects back. Measurements can be made even at night when light levels are low.

[0013] By combining LiDAR and RTLS technologies, it is possible to create a 3D point cloud while moving, which increases the accuracy of the measurement. However, the amount of information in the point cloud data is large, so the computational load is high, and the sensor itself is expensive compared to Tof sensors and cameras.

[0014] Existing sensor technologies for implementing RTLS functions still have issues such as the possibility of location recognition errors due to interference between people and equipment in logistics workplaces, changes in sensing accuracy depending on the environment such as lighting, slowdowns due to data processing, and location error errors. Furthermore, using hybrid sensors to address these issues can lead to increased prices.

[0015] Therefore, existing sensor technologies for implementing RTLS technology had problems due to obstacles, processing speed, and price.

[0016] As for prior art, please refer to the registered patent No. 10-0772500 (October 26, 2007) “Radio wave identification detection unit and object location tracking device and method using the same.”

[0017] The purpose of the present invention is to provide a receiver for a real-time position tracking system and a real-time position tracking system using the receiver, which can improve the accuracy of indoor positioning and additionally minimize interference of interference waves by shielding three of the four sides of the antenna with a shielding member while rotating the antenna of the receiver by 360°, thereby shielding interference waves reflected from indoor walls or obstacles, and receiving waves transmitted from a transmitter only through the remaining one side.

[0018] A receiver for a real-time location tracking system according to the present invention comprises: a housing; an antenna provided on the upper side of the housing for receiving radio waves transmitted from a transmitter while rotating on an axis; a drive control unit provided on the lower side of the housing for controlling the drive of the antenna; and a shielding member arranged on one side of the antenna for shielding the antenna from receiving interference radio waves entering from a direction other than a specific direction.

[0019] At this time, the antenna according to the present invention includes a rotating support that supports the antenna and rotates vertically in an up-and-down direction about the center as an axis, and an electric motor that is mechanically connected to the lower side of the rotating support and selectively rotates the rotating support.

[0020] And, it is preferable that the shielding member according to the present invention has a material that absorbs radio waves applied to the surface of the insulating plate to a certain thickness.

[0021] In addition, the shielding member according to the present invention shields three of the four sides of the antenna array based on the axis, and allows radio waves to be received only in the remaining one side.

[0022] Here, the shielding member according to the present invention can be formed to extend outward longer than the width of the antenna array.

[0023] In addition, the antenna according to the present invention may include a second electric motor coupled to the side of the rotating support to rotate the antenna about an axis in a horizontal line on the upper side of the rotating support, and an 'L'-shaped support bracket having one end connected to the rotational axis of the electric motor that rotates the rotating support and the other end supporting the second electric motor.

[0024] A real-time location tracking system according to the present invention comprises: a short-range wireless communication module, comprising: a plurality of transmitters that are arranged on each measuring point and transmit radio waves; a short-range wireless communication module, comprising: a receiver that receives radio waves transmitted from the plurality of transmitters; and a server that is connected to the receivers through wireless communication and tracks the location of the logistics transportation equipment by displaying the location of the logistics transportation equipment as two-dimensional location coordinates (x, y) based on the transmitter ID and signal strength each received by the receiver.

[0025] At this time, it is preferable that the receiver and transmitter according to the present invention be placed on the same height line.

[0026] And, when the real-time location tracking system according to the present invention detects the location of the receiver, it detects the location of the receiver by triangulation with two adjacent transmitters among a plurality of transmitters whose radio waves received by the receiver are the strongest.

[0027] A receiver for a real-time location tracking system according to the present invention and a real-time location tracking system using the receiver have the following effects.

[0028] By rotating the antenna of the receiver 360° and shielding three of the four sides of the antenna with a shielding member, interference waves reflected from indoor walls or obstacles are shielded, and waves transmitted from the transmitter are received only through the remaining one side, thereby improving the accuracy of indoor positioning and further minimizing interference from interference waves.

[0029] By using gigahertz (GHz) radio waves, it is less affected by obstacles in the workplace, and by using two or more transmitters and one receiver, it recognizes the location of a moving receiver through triangulation, and can provide a more precise real-time location tracking system than before.

[0030] Since multiple transmitters and receivers are positioned at the same height, the absolute position of the receiver can be determined in two dimensions, making it easy to implement a real-time location system (RTLS).

[0031] FIG. 1 is an exemplary diagram showing a receiver for a real-time location tracking system according to an embodiment of the present invention.

[0032] FIG. 2 is an exemplary diagram showing the configuration of a drive control unit of a receiver according to an embodiment of the present invention.

[0033] FIG. 3 is an exemplary diagram showing an antenna according to an embodiment of the present invention.

[0034] FIG. 4 is an exemplary diagram showing shielding of an antenna according to an embodiment of the present invention.

[0035] Figure 5 is an example diagram showing the phase difference according to the transmission position of multiple receivers for one transmitter.

[0036] Figure 6 is an exemplary diagram showing a real-time location tracking system according to the first embodiment of the present invention.

[0037] Figure 7 is an exemplary diagram showing a real-time location tracking system according to a second embodiment of the present invention.

[0038] FIG. 8 is a schematic diagram showing a receiver of a real-time location tracking system according to a second embodiment of the present invention.

[0039] FIG. 9 is a simplified exemplary diagram showing rotation control of a receiver of a real-time location tracking system according to a second embodiment of the present invention.

[0040] The present invention provides a receiver for a real-time location tracking system, which includes a housing, an antenna provided on the upper side of the housing for receiving radio waves transmitted from a transmitter while rotating on an axis, a drive control unit provided on the lower side of the housing for controlling the driving of the antenna, and a shielding member arranged on one side of the antenna for shielding the antenna from receiving interference radio waves coming in from a direction other than a specific direction.

[0041] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, the terms and concepts should be interpreted in a way that conforms to the technical spirit of the present invention.

[0042] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be equivalent modified examples that can replace them at the time of this application.

[0043] The present invention relates to a receiver for a real-time position tracking system that can improve the precision of indoor positioning and, in addition, minimize interference of interference waves reflected from indoor walls or obstacles and received, and a real-time position tracking system using the receiver, and the drawings are as follows.

[0044] A receiver (10) for a real-time location tracking system according to an embodiment of the present invention with reference to FIGS. 1 to 5 includes a housing (100) and an antenna (200).

[0045] The housing (100) has a cylindrical overall shape like a typical receiver, and is divided into an antenna section (110) where the antenna (200) is placed, and a drive control section (120) that controls the drive of the antenna (200).

[0046] Here, the antenna unit (110) is positioned at the upper portion of the housing (100), and forms a receiving space (111) inside the housing to receive the antenna (200), and a protective cover (112) is combined to protect the antenna (200) received in the receiving space (111), thereby forming the outer wall of the receiving space (111).

[0047] At this time, it is preferable that the antenna (200) be provided so as to be able to rotate 360° about a vertical axis within the receiving space (111) and so as to be able to rotate 180° about a horizontal axis, and the protective cover (112) is made of a material that is easy to transmit radio waves and covers the circumferential direction of the receiving space (111) so as not to affect the rotation of the antenna (200).

[0048] Accordingly, the antenna (200) rotates 360° about a vertical axis and 180° about a horizontal axis within the receiving space (111) formed on the upper portion of the housing (100) to receive GHz radio waves transmitted from the transmitter (20).

[0049] Here, the antenna (200) includes a rotation support (210), an antenna array (220), and a shielding member (230). The rotation support (210) supports the antenna array (220) and the shielding member (230) and rotates 360° about an axis in a vertical direction.

[0050] At this time, the rotating support (210) has a body that forms a block in the shape of a 'ㅂ', and an antenna array (220) and a shielding member (230) are provided on the upper surface of the rotating support (210) in a state where the area is erected in a vertical line in the upper and lower directions.

[0051] And the lower side of the above-mentioned rotary support (210) is mechanically connected to the electric motor (121) of the drive control unit (120) placed on the lower side of the above-mentioned antenna unit (110), and rotates about the center in conjunction with the rotation of the rotation axis of the above-mentioned electric motor (121).

[0052] Accordingly, as the rotation support (210) rotates about the center as an axis, the antenna array (220) and shielding member (230) provided on the upper surface of the rotation support (210) also rotate about the center as an axis of the rotation support (210).

[0053] Here, the antenna including the antenna array (220) and the shielding member (230) is connected to the upper side of the rotation support (210) so as to be rotatable 180° about an axis in a horizontal line.

[0054] At this time, a connecting part (241) is provided on the lower side of the shielding member (230) that surrounds the three sides of the antenna array (220). The connecting part (241) is placed in a groove formed on the upper side of the rotating support (210), and the rotating shaft of the second electric motor (240) is connected.

[0055] Here, the above-mentioned connecting portion (241) can be integrally formed on the lower surface of the shielding member (230), and at this time, it is formed to protrude downward from the lower surface of the shielding member (230), so that the rotational axis of the second electric motor (240) is connected.

[0056] The second electric motor (240) selectively provides rotational force so that the antenna including the antenna array (220) and the shielding member (230) rotates 180°.

[0057] And the second electric motor (240) is coupled to the side of the rotating support (210) and is supported by an ‘L’ shaped support bracket (242).

[0058] Accordingly, the second electric motor (240) and the support bracket (242) rotate about an axis in a vertical line in synchronization with the rotation of the rotation support (210), and cause the antenna including the antenna array (220) and the shielding member (230) to rotate about an axis in a horizontal line.

[0059] And the above antenna array (220) is an array of antennas that receive GHz radio waves in an orthogonal manner, and as it can be implemented in various ways, a detailed description thereof will be omitted in the present invention.

[0060] And the surrounding area of ​​the antenna array (220) is shielded by the shielding member (230). The shielding member (230) is an insulating plate on which a material that absorbs radio waves is applied to a certain thickness. The shielding member (230) shields three of the four sides of the antenna array (220) based on the axis, and leaves only the remaining one side open without shielding to receive radio waves.

[0061] Here, the shielding member (230) is provided with a first shielding member arranged in front of the antenna array (220), a second shielding member arranged in the rear of the antenna array (220), and a third shielding member arranged inside the antenna array (220).

[0062] Accordingly, the shielding member (230) composed of three third shielding members shields the front, rear, and inner (or either left or right) areas of the antenna array (220) based on the center of the receiving space (111), and the outer (or either left or right) area is open, so that the antenna array (220) can receive GHz radio waves transmitted from the transmitter only through the open area, thereby reducing the influence of interference radio waves received by being reflected from indoor walls or obstacles.

[0063] Here, it is preferable that the shielding member (230) be formed to extend outward relatively longer than the width of the antenna array (220).

[0064] Accordingly, the antenna array (220) that rotates 360° in the receiving space (111) receives radio waves only through a single open area, and when the transmitter (20) and the open area are in a straight line, the reception intensity of the radio waves is the strongest, and regression machine learning is performed based on this.

[0065] And, a driving control unit (120) is positioned at the bottom of the antenna unit (110). The driving control unit (120) provides a rotational force to rotate the antenna (200) provided in the antenna unit (110), and uses the radio waves of the transmitters (20) obtained from the antenna (200) to derive the absolute position 2-dimensional coordinates of the corresponding receiver (10) in the indoor space and transmits them to the server (30).

[0066] Accordingly, the drive control unit (120) includes a power supply unit (121) that supplies power to the antenna array (220), an electric motor (122) that provides rotational force to the rotating body, a calculation unit (123) that calculates the two-dimensional absolute position coordinates of the corresponding receiver (10) in an indoor space using the radio waves of the received transmitters (20), and a communication unit (124) that communicates the two-dimensional absolute position coordinates of the corresponding receiver (10) calculated in the calculation unit (123) to a server (30).

[0067] Figure 5 shows the phase difference according to the transmission position when there are multiple receivers (10) for one transmitter (20), and can be expressed by [Mathematical Formula 1] below.

[0068]

[0069] Here, ψ is the phase difference, λ is the wavelength (12.5 cm), and d is the distance between adjacent antennas.

[0070] When the receiver (10) and transmitter (20) form a 90° angle, the phase difference is the largest, and when the antenna of the receiver (10) is rotated 360° at high speed to analyze the signal, the relative angle between the transmitter (20) and receiver (10) can be measured with high resolution (e.g., within 0.1°).

[0071] Additionally, accuracy can be improved by performing analysis using real-time regression machine learning.

[0072] [Example 1]

[0073] A real-time location tracking system using a receiver according to an embodiment of the present invention with reference to FIG. 6 includes a plurality of transmitters (20), a plurality of receivers (10), and a server (30). The plurality of transmitters (20) and receivers (10) are installed at positions at the same height from the ground, and the absolute position of the receiver (10) can be determined by triangulation in a two-dimensional space by the transmitters (20) and receivers (10).

[0074] For example, a location tracking system using a plurality of transmitters (20) (at least two or more) and a receiver (10) includes a first transmitter (21), a second transmitter (22), a third transmitter (23), a receiver (10), and a server (30).

[0075] The first transmitter (21) is a short-range wireless communication module and is installed on the first measuring point (x1, y1), which is a temporary measuring point inside the logistics warehouse.

[0076] The second transmitter (22) is a short-range wireless communication module and is installed on the second measuring point (x2, y2), which is a temporary measuring point inside the logistics warehouse, at a distance from the first transmitter (21).

[0077] And the third transmitter (23) is also a short-range wireless communication module, and is installed on the third measuring point (x3, y3), which is a temporary measuring point inside the logistics warehouse, spaced apart from the first transmitter (21) and the second transmitter (22).

[0078] Here, the first, second and third transmitters (21, 22, 23) are each implemented based on Bluetooth 4.0 LE (Low Energy) and are short-range wireless communication modules having a communication range of 50 to 70 m, and communicate in the UWB (UltraWide Band) mode.

[0079] In the embodiment of the present invention, UWB communication is used, but various other communication methods may also be applied.

[0080] Although it has been described that the first to third transmitters (21, 22, 23) are used, the two-dimensional absolute position coordinates can be determined more accurately by using three or more transmitters (20).

[0081] The above receiver (10) is mounted on the transport equipment (1) deployed in the logistics work site, and receives the transmitter ID and signal strength from the first to third transmitters (21, 22, 23), respectively.

[0082] Additionally, the transport equipment (1) can wirelessly transmit the transmitter ID and signal strength data received from the receiver (10) to the server (30).

[0083] The above server (30) is connected to the receivers (10) through wireless communication, and tracks the location of the transport equipment (1) by displaying the location of the transport equipment (1) as a two-dimensional absolute position coordinate (x, y) based on the transmitter ID and signal strength each received by the receiver (10).

[0084] Specifically, the server (30) determines the position (x', y') of the receiver (10) based on the transmitter ID and signal strength each received by the receiver (10), and then determines the two-dimensional absolute position coordinates (x, y) of the transport equipment (1) based on the distance between the receiver (10) and the reference point of the transport equipment (1).

[0085] Here, d1 represents the horizontal distance from the first transmitter (21) to the first receiver (10), d2 represents the horizontal distance from the second transmitter to the first receiver, and d represents the horizontal distance from the first transmitter to the second transmitter.

[0086] At this time, since the coordinate positions of the first and second measuring points are already known, the above d is a given value that can be obtained through calculation.

[0087] Therefore, the absolute coordinates of the first receiver (10) can be obtained through triangulation using the two transmitters (20) with the strongest signal strength from the positioning target receiver (10) and the positioning target receiver (10).

[0088] The positioning accuracy by general GHz radio waves is about 10 cm, but by the present invention, a positioning accuracy of less than 2.5 cm, which is improved by more than four times, can be obtained.

[0089]

[0090] [Example 2]

[0091] A real-time location tracking system using a receiver according to an embodiment of the present invention with reference to FIGS. 7 and 9 includes a single transmitter (20), a receiver (10), and a server (30). The single transmitter (20) and the single receiver (10) are installed at the same height from the ground, and the absolute position of the receiver (10) in a two-dimensional space can be determined by the transmitter (20), the receiver (10), and the geomagnetic sensor (11).

[0092] For example, a location tracking system using a single transmitter (20) and receiver (10) includes a transmitter (20), a receiver (10), a geomagnetic sensor (11), and a server (30).

[0093] The above transmitter (20) is a short-range wireless communication module and is installed on a temporary measuring point (x1, y1) inside the logistics warehouse.

[0094] Here, the transmitter (20) is a short-range wireless communication module implemented based on Bluetooth 4.0 LE (Low Energy) and having a communication range of 50 to 70 m, and communicates in the UWB (Ultra Wide Band) method.

[0095] In the embodiment of the present invention, UWB communication is used, but various other communication methods may also be applied.

[0096] The above receiver (10) is also a short-range wireless communication module implemented based on Bluetooth 4.0 LE (Low Energy) and has a communication range of 50 to 70 m, and communicates using the UWB (Ultra Wide Band) method.

[0097] The above receiver (10) is mounted on a transport equipment (1) deployed in a logistics work site and receives a signal transmitted from the transmitter (20).

[0098] Here, the receiver (10) can be divided into a fixed part (40) and a rotating part (50). First, the rotating part (50) includes an antenna that receives radio waves, and the antenna can rotate about an axis in a vertical direction.

[0099] At this time, the rotation angle of the antenna can be rotated clockwise (+ angle) or counterclockwise (- angle) within a range of 360° or 180° based on the front of the transport equipment (1).

[0100] The above fixed part (40) is equipped with an angle sensor (41) that measures the rotation angle of the above rotating part (50), a rotation driving part (42) that generates a driving force to rotate the above rotating part (50), and a control part (43) that controls the rotation part (50) and the rotation driving part (42) according to a received signal.

[0101] At this time, the control unit (43) can communicate wirelessly with the server (30) and receives the rotation angle of the antenna measured by the angle sensor (41) and the drive control signal.

[0102] At this time, the angle at which the front of the antenna (rotating part) of the receiver (10) faces the transmitter (20) based on the center of the receiver (10) is usually 0° when the front of the receiver (10) faces the transmitter (20).

[0103] Referring to FIG. 9 here, the transmitter (20) and receiver (10) can communicate continuously, so that the antenna is directed toward the transmitter (20), and at this time, the receiver (10) can be controlled to rotate within a range of +30° to -30° with 0° as the standard.

[0104] In addition, the fixed part (40) is further equipped with a geomagnetic sensor (11), and the geomagnetic sensor (11) measures the true north direction through the detected geomagnetism (the Earth's magnetic field lines) and transmits the measured true north direction data to the server (30) through the control part (43).

[0105] In addition, the above transport equipment (1) can wirelessly transmit signal strength data of the transmitter received from the receiver (10) to the server (30).

[0106] The above server (30) is connected to the receiver (10) via wireless communication, and calculates the position of the receiver (10) by using the distance (L) between the transmitter (20) and the receiver (10) and the azimuth (θ₁) of the receiver (10) based on the transmitter (20) using the signal received by the receiver (10).

[0107] Based on the True North direction, the azimuth (θ₁) of the transmitter (20) with respect to the receiver (10), the rotation angle (θ₂) of the receiver (10), and the direction (θ₃) of the transport equipment (1) with respect to the receiver (10), the position of the transport equipment (1) can be measured and tracked by indicating the position of the transport equipment (1) as a two-dimensional absolute position coordinate (x, y).

[0108] Specifically, the distance (L) between the transmitter (20) and the receiver (10) can be obtained by converting the intensity of the signal received by the receiver (10), and the true north direction can be obtained through the geomagnetic sensor (11).

[0109] And, based on the transmitter (20), the azimuth (θ₁) of the receiver (10) is the relative angle between the receiver (10) and the transmitter (20), and is the angle between the true north direction (N) and the line connecting the center of the receiver (10) and the transmitter (20).

[0110] In addition, the azimuth (θ₂) of the receiver (10) is an azimuth measured in UWB, and is an angle formed by the front direction of the receiver and the direction of the transmitter, and can be expressed numerically on the UWB board and used.

[0111] The angle at which the front of the antenna (rotating part) of the receiver (10) faces the transmitter (20) based on the center of the receiver (10), is usually 0° when the front of the receiver (10) faces the transmitter (20).

[0112] The rotation angle (θ₃) of the receiver (10) is the rotation angle of the receiver (rotating part) based on the transport equipment (1) and is measured by the angle sensor (41) included in the receiver (10).

[0113] In addition, a correction angle (θ₄) based on the true north direction can be obtained, which is the angle between the true north direction based on the receiver and the front direction of the transport equipment.

[0114] Here, the azimuth angle (θ₁) of the receiver (10) based on the transmitter (20) is equal to the sum of the azimuth angle (θ₂) of the receiver (10), the rotation angle (θ₃) of the receiver (10), and the correction angle (θ₄) based on the true north direction, as in [Mathematical Formula 2] below.

[0115]

[0116] Therefore, the absolute coordinates of the receiver (10) can be obtained using the azimuth (θ₁) of the receiver (10) based on the transmitter (20) and the distance (L) between the transmitter (20) and the receiver (10).

[0117] The positioning accuracy by general GHz radio waves is about 10 cm, but by the present invention, a positioning accuracy of less than 2.5 cm, which is improved by more than four times, can be obtained.

[0118] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. In a receiver that receives GHz radio waves transmitted from a transmitter, housing; An antenna provided on the upper side of the housing, which receives radio waves transmitted from a transmitter while rotating on an axis; A driving control unit provided on the lower side of the housing and controlling the driving of the antenna; and A receiver for a real-time location tracking system, comprising a shielding member arranged on one side of the antenna and shielding the antenna from receiving interference waves coming from a direction other than a specific direction.

2. In claim 1, The above antenna A rotating support that supports the above antenna and rotates vertically in an axis with the center as the axis, A receiver for a real-time position tracking system, comprising an electric motor mechanically connected to the lower side of the above-mentioned rotating support and selectively rotating the above-mentioned rotating support.

3. In claim 1, The above shielding member A receiver for a real-time location tracking system characterized in that a radio wave absorbing material is applied to the surface of an insulating plate to a certain thickness.

4. In claim 1, The above shielding member A receiver for a real-time position tracking system that shields three of the four sides of the antenna array based on the axis and allows radio waves to be received only on the remaining one side.

5. In claim 4, The above shielding member A receiver for a real-time position tracking system characterized by being formed to extend outward longer than the width of the antenna array.

6. In claim 2, The above antenna A second electric motor coupled to the side of the above-mentioned rotating support and rotating the antenna about an axis in a horizontal line on the upper side of the above-mentioned rotating support; A receiver for a real-time position tracking system, comprising an 'L'-shaped support bracket, one end of which is connected to the rotational axis of an electric motor that rotates the above-mentioned rotating support, and the other end of which supports the second electric motor.

7. A short-range wireless communication module comprising: a plurality of transmitters arranged on each measuring point and transmitting radio waves; A short-range wireless communication module comprising: a receiver that receives radio waves transmitted from the plurality of transmitters; A real-time location tracking system comprising a server that is connected to the receiver via wireless communication and measures the location of the logistics transport equipment on which the receiver is installed based on the transmitter ID and signal strength received by the receiver.

8. In claim 7, A real-time location tracking system having the above receivers and transmitters arranged on the same height line.

9. In claim 7, When detecting the location of the above receiver, A real-time location tracking system that detects the location of a receiver by triangulating with two adjacent transmitters among multiple transmitters whose radio waves are the strongest.

10. A short-range wireless communication module, which is placed at a designated measuring point and transmits radio waves; A short-range wireless communication module comprising: a receiver that receives radio waves transmitted from the transmitter; A geomagnetic sensor that measures the true north direction through the detected geomagnetism (the Earth's magnetic field lines); and A real-time location tracking system comprising a server that is connected to the receiver via wireless communication and measures the location of logistics transportation equipment on which the receiver is installed based on the distance, reception angle, and true north direction according to the signal received by the receiver.

11. In claim 10, The above receiver The antenna that receives the radio waves rotates around an axis in a vertical direction, A real-time location tracking system further comprising an angle sensor that measures the rotation angle of the antenna based on the front of the logistics transport equipment.

12. In claim 11, The above antenna A real-time position tracking system characterized in that the rotation is controlled so that the azimuth angle with respect to the transmitter is 0°.

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