System and method for outputting a pseudo-GNSS signal inside a tunnel

Abstract

To provide a system and a method for outputting a pseudo GNSS signal in a tunnel.SOLUTION: The pseudo GNSS signal output system includes a main device provided outside the tunnel, and a plurality of remote devices provided inside the tunnel at first intervals and communicating with the main device. The plurality of remote devices includes a radar device configured to output a radar signal and to detect a radar signal reflected from an object, at least one pseudo GNSS signal output device, a communication module configured to communicate with the main device, and a processor. The processor may be further configured to recognize a position and a speed of the vehicle while the vehicle is traveling in the tunnel based on the radar signal detected by the radar apparatus, transmit the recognized position and speed of the vehicle to the main apparatus through the communication module, receive pseudo-GNSS signal information from the main apparatus through the communication module, and generate and output a pseudo-GNSS signal through at least one pseudo-GNSS signal output apparatus based on the pseudo-GNSS signal information.SELECTED DRAWING: Figure 1

Description

Technical Field

[0003] , , , ,

[0001] The present invention relates to a pseudo GNSS signal output system and a pseudo GNSS signal output method for outputting a pseudo GNSS signal in a tunnel.

Background Art

[0002] GNSS (Global Navigation Satellite System) is a technology for calculating the position information of a receiver based on information received from satellites. GNSS systems include, for example, the GPS (Global Positioning System) of the United States, GLONASS of Russia, the Galileo system of the EU (European Union), Beidou of China, the Quasi-Zenith Satellite System (QZSS) of Japan, and IRNSS (Indian Regional Navigation Satellite System) of India. Since GNSS uses information received from satellites, there is a limit in grasping the position of the receiver in GNSS shadow areas where there are obstacles to line-of-sight communication (LOS) with satellites, such as underground facilities. As a result, it is difficult to provide accurate position information when trying to provide position information using GNSS indoors. For example, in systems that involve providing position information indoors, underground, or in tunnels, such as bus arrival time notification services and navigation guidance systems in underground facilities, due to the limitations of GNSS, there is a problem of deterioration in the quality of useful public services for citizens. When buses are located in underground transfer centers and long tunnels, GNSS reception is impossible, and it is impossible to track the position of the buses, resulting in problems such as a decrease in the accuracy of the position information and the scheduled arrival time of the buses provided by the scheduled arrival time service.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The technical problem that this invention aims to solve is to provide a system that outputs a pseudo-GNSS signal inside a tunnel.

[0004] Furthermore, a technical problem that the present invention aims to solve is to provide a pseudo-GNSS signal output method that outputs a pseudo-GNSS signal inside a tunnel. [Means for solving the problem]

[0005] According to one aspect of one embodiment of the present invention, a pseudo-GNSS signal output system is disclosed. The pseudo-GNSS signal output system includes a main unit located outside the tunnel; and a plurality of remote units located at first intervals inside the tunnel and communicating with the main unit. Each of the plurality of remote units includes a radar device that outputs a radar (RADAR; radio detection and ranging) signal and detects radar signals reflected from an object; at least one pseudo-GNSS signal output unit; a communication module that communicates with the main unit; and a processor. The processor uses the radar signal detected by the radar device to recognize the position and speed of a vehicle traveling in the tunnel, transmits the recognized position and speed of the vehicle to the main unit via the communication module, receives pseudo-GNSS signal information from the main unit via the communication module, and can generate and output a pseudo-GNSS signal via at least one pseudo-GNSS signal output unit using the pseudo-GNSS signal information.

[0006] Furthermore, according to one embodiment of the present invention, the main device determines the magnitude of the azimuth angle and the output power of a GNSS antenna that outputs a pseudo-GNSS signal based on the position and speed of the vehicle received from each of the multiple remote devices, and the pseudo-GNSS signal information may include the magnitude of the azimuth angle and the output power.

[0007] Furthermore, according to one embodiment of the present invention, the main device communicates with each of the multiple remote devices via optical fiber cables, sends a delay measurement message to each of the multiple remote devices to measure the optical delay, receives a response message to the delay measurement message, measures the optical delay between each of the multiple remote devices and the main device based on the response message, and transmits pseudo-GNSS signal information based on the optical delay.

[0008] Furthermore, according to one embodiment of the present invention, the main device can generate a C / A code that reflects the optical delay of each remote device in the GNSS signal information received from the server, and generate the pseudo-GNSS signal information including the generated C / A code.

[0009] Furthermore, according to one embodiment of the present invention, the main device generates the pseudo-GNSS signal in I / Q form modulated in QPSK form, and the pseudo-GNSS signal may include a C / A code in the Q phase and a C / A code and an arbitrary P code in the I phase.

[0010] Furthermore, according to one embodiment of the present invention, the pseudo-GNSS signal output device includes a plurality of directional GNSS antennas corresponding to each lane of the roadway in the tunnel and outputting pseudo-GNSS signals to the corresponding lanes, and the pseudo-GNSS signals may include lane information.

[0011] Furthermore, according to one embodiment of the present invention, the pseudo-GNSS signal output device may include a forward GNSS antenna that outputs a pseudo-GNSS signal forward and a rear GNSS antenna that outputs a pseudo-GNSS signal rear.

[0012] Furthermore, according to one embodiment of the present invention, the processor of each of the multiple remote devices uses radar signals to recognize the speed of vehicles traveling in each lane of the roadway within the tunnel, transmits the recognized vehicle speeds for each lane to the main device via a communication module, and the main device can adjust the magnitude of the azimuth angle and output power of the GNSS antenna of each remote device based on the recognized vehicle speeds in each lane.

[0013] Furthermore, according to one embodiment of the present invention, each of the multiple remote devices includes a camera, and the processor can recognize the position, speed, and vehicle number of a vehicle traveling in a tunnel based on radar signals detected by a radar device and images captured by a camera, and transmit the recognized position, speed, and vehicle number of the vehicle to the main device.

[0014] Furthermore, according to one embodiment of the present invention, each of the multiple remote devices further includes a BLE device that outputs a Bluetooth signal, and a vehicle in a tunnel can store BLE map information including the location and identification information of each of the multiple remote devices' BLE devices, calculate the angle at which the Bluetooth signal was received from the BLE device using the BLE map information and the RSSI phase of the Bluetooth signal output from the BLE device, and measure the distance from the BLE device using the BLE map information and the RSSI value.

[0015] Furthermore, according to one embodiment of the present invention, each of the multiple remote devices further includes a UWB device that outputs a UWB signal, and a vehicle in a tunnel can store UWB map information including the location and identification information of each of the multiple remote devices' UWB devices, and use the UWB map information and UWB signals output from four or more UWB devices to detect the vehicle's position.

[0016] According to one aspect of one embodiment of the present invention, a pseudo-GNSS signal output method is provided which outputs pseudo-GNSS signals from a plurality of remote devices arranged in a tunnel. The pseudo-GNSS signal output method includes the steps of: outputting radar signals from radar (RADAR; radio detection and ranging) devices of each of the plurality of remote devices; recognizing the position and speed of a vehicle traveling in the tunnel using the radar signals detected by the radar devices; transmitting the recognized position and speed of the vehicle to a main device located outside the tunnel; receiving pseudo-GNSS signal information from the main device; and generating and outputting a pseudo-GNSS signal via at least one pseudo-GNSS signal output device using the pseudo-GNSS signal information. [Brief explanation of the drawing]

[0017] [Figure 1] This is a diagram showing a pseudo-GNSS (Global Navigation Satellite system) signal output system according to one embodiment of the present invention. [Figure 2] This is a diagram showing the configuration of the main device and remote device according to one embodiment of the present invention. [Figure 3] This flowchart shows a method for outputting a pseudo-GNSS signal according to one embodiment of the present invention. [Figure 4] This is a drawing showing the arrangement and connection structure of the main device and remote device according to one embodiment of the present invention. [Figure 5] This diagram illustrates the process of measuring optical delay and generating pseudo-GNSS signal information that reflects the optical delay using one embodiment of the present invention. [Figure 6A] This is a perspective view of a remote device with its cover open, according to one embodiment of the present invention. [Figure 6B] This is a drawing showing the front view of the remote control device with its cover closed. [Figure 7] This diagram shows an embodiment of the system that outputs pseudo-GNSS signals for each lane. [Figure 8]A drawing showing an aspect of outputting a pseudo GNSS signal to the front and rear of a tunnel according to an embodiment of the present invention. [Figure 9] A block diagram showing the structure of a remote device according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0018] This specification clarifies the scope of the claims of the present invention, explains the principles of the embodiments of the present invention, and discloses the embodiments so that those with ordinary knowledge in the technical field to which the embodiments of the present invention belong can implement the embodiments of the present invention. The disclosed embodiments can be embodied in various forms.

[0019] Throughout the specification, the same reference numerals refer to the same components. This specification does not explain all the elements of the embodiments, and omits general content or overlapping content of the embodiments in the technical field to which the embodiments of the present invention belong. The term "part" used in the specification can be embodied as software or hardware, and in an embodiment, a plurality of "parts" can be embodied by one "unit" or "element", or one "part" can include a plurality of elements. Hereinafter, embodiments of the present invention and the operating principles of the embodiments will be described based on the accompanying drawings.

[0020] FIG. 1 is a drawing showing a pseudo GNSS (Global Navigation Satellite System) signal output system according to an embodiment of the present invention.

[0021] The pseudo GNSS signal output system 100 according to an embodiment of the present invention is provided in a GNSS shadow area 130 where the satellite signal 142 from the satellite 140 is not transmitted, and generates and outputs a pseudo GNSS signal 122. The GNSS shadow area 130 corresponds to, for example, a tunnel, the inside of a building, an underground space, etc. The GNSS shadow area 130 is an area where the satellite signal 142 is not transmitted due to obstacles such as concrete and steel bars.

[0022] Since satellite signal 142 is not transmitted to GNSS shadowed area 130, client devices 150 within GNSS shadowed area 130 cannot receive GNSS signals. As a result, client devices 150 within GNSS shadowed area 130 cannot receive satellite signal 142 from satellite 140. The pseudo-GNSS signal output system 100 according to an embodiment of the present invention generates a pseudo-GNSS signal 122 within GNSS shadowed area 130, as if it were generated and output by satellite 140, and outputs it to client devices 150 within GNSS shadowed area 130. Since the pseudo-GNSS signal 122 is a signal generated in the same way as the signal output from satellite 140, client devices 150 can process it in the same way as satellite signal 142 received from outside GNSS shadowed area 130 to obtain position information. Therefore, according to an embodiment of the present invention, position information can be obtained from the pseudo-GNSS signal 122 using the general-purpose GNSS module of the client device 150. In other words, according to the embodiment of the present invention, the client device 150 does not need to change its device structure for processing the pseudo-GNSS signal 122 according to the embodiment of the present invention.

[0023] The GNSS system, including satellite 140, may correspond to, for example, the US GPS (Global Positioning System), Russia's GLONASS, the EU's Galileo system, China's Beidou, Japan's Quasi-Zenith Satellite System (QZSS), or India's IRNSS (Indian Regional Navigation Satellite System). The pseudo-GNSS signal output system 100 can generate and output a pseudo-GNSS signal 122 corresponding to the GNSS system to be generated.

[0024] A pseudo-GNSS signal output system 100 according to one embodiment of the present invention may include a main unit 110 and a plurality of remote units 120. The pseudo-GNSS signal output system 100 may be located inside and outside the tunnel. The inside of the tunnel may correspond to a GNSS shaded area 130. The main unit 110 may be located inside or outside the tunnel. The plurality of remote units 120 may be located inside the tunnel.

[0025] The main device 110 may be positioned to receive GNSS signals 142 from satellite 140. The main device 110 can communicate with multiple remote devices 120. The main device 110 and the multiple remote devices 120 may be connected via fiber optic cables. The main device 110 and the multiple remote devices 120 can communicate using optical communication via fiber optic cables.

[0026] The main device 110 can receive future GNSS navigation information from the GNSS system server and generate pseudo-GNSS signal information used to generate pseudo-GNSS signals 122 using the future GNSS navigation information. The GNSS navigation information is information about the position of at least one satellite 140 at a predetermined point in the future. The GNSS navigation information may be updated at intervals of several seconds, several minutes, several days, or several weeks at the server. The main device 110 can receive GNSS navigation information from the server at the same frequency as the update interval, or at a shorter frequency than the update interval, and update the stored GNSS navigation information. The main device 110 receives GNSS navigation information from the server for a predetermined future time interval (e.g., 4 weeks) for at least one satellite 140. If there are 13 satellites 140, the main device 110 receives GNSS navigation information for each of the 13 satellites. According to one embodiment, there is at least one server that provides GNSS navigation information corresponding to each of the 13 satellites 140, and the main device 110 can receive GNSS navigation information from each of the at least one servers. The GNSS navigation information can be stored and transmitted, for example, in RINEX file format.

[0027] The main device 110 transmits the generated pseudo-GNSS signal information to a plurality of remote devices 120. The main device 110 can transmit the pseudo-GNSS signal information to the plurality of remote devices 120 at a predetermined period. The main device 110 may include an optical signal converter 112 and a signal generation unit 114. The optical signal converter 112 can convert the RF (Radio Frequency) signal generated by the signal generation unit 114 into an optical signal and transmit it through an optical fiber cable. The signal generation unit 114 generates pseudo-GNSS signal information corresponding to GNSS navigation information and outputs it to the optical signal converter 112. According to one embodiment of the present invention, the main device 110 can generate and output pseudo-GNSS signal information relating to each of the plurality of remote devices 120. For example, the main device 110 can generate first pseudo-GNSS signal information relating to a first remote device 120a and transmit it to the first remote device 120a. Furthermore, the main device 110 can generate and transmit second pseudo-GNSS signal information related to the second remote device 120b to the second remote device 120b. Also, the main device 110 can generate and transmit third pseudo-GNSS signal information related to the third remote device 120c to the third remote device 120c.

[0028] According to one embodiment of the present invention, the main device 110 can measure the Doppler shift from the real-time satellite signal 142 received from the satellite 140 and reflect the measured Doppler shift in the GNSS navigation information.

[0029] Multiple remote devices 120 may be positioned at different locations within the tunnel. The multiple remote devices 120 receive pseudo-GNSS signal information from the main device 110. The multiple remote devices 120 may use the pseudo-GNSS signal information to generate and output a pseudo-GNSS signal 122.

[0030] According to one embodiment of the present invention, each remote device 120 is equipped with a GNSS antenna and can output a pseudo-GNSS signal 122 via the GNSS antenna. The GNSS antenna is a directional antenna, and is also an antenna in which the direction of the signal and the output angle range can be adjusted. According to one embodiment of the present invention, a directional GNSS antenna can be used to output different pseudo-GNSS signals 122 for each lane. The signals output via the GNSS antenna for each lane may have different signal characteristics (e.g., frequency) or different additional information.

[0031] Furthermore, according to one embodiment of the present invention, multiple remote devices 120 may output pseudo-GNSS signals 122 via leak cables. Leak cables are provided to transmit signals in a predetermined direction from each of the remote devices 120a, 120b, and 120c. One end of the leak cable is connected to the output terminal of the remote devices 120a, 120b, and 120c, and the other end is connected to a predetermined signal transmission terminal. The leak cables are arranged to correspond to the signal transmission direction of the pseudo-GNSS signals 122. For example, two leak cables may be connected to one remote device 120a, 120b, and 120c, and the two leak cables may be arranged to transmit pseudo-GNSS signals 122 from one signal output device 120a, 120b, and 120c in opposite directions to each other. Leak cables may also be provided individually for each lane. The leak cables for each lane may have different signal characteristics (e.g., frequency) or different additional information.

[0032] Leakage cables, also known as leakage coaxial cables, are cables that perform the role of a GNSS antenna by processing the outer conductor of a coaxial cable to form signal leakage slots. Leakage cable 130 outputs a pseudo-GNSS signal by transmitting electromagnetic waves through artificial processing of the outer conductor of the coaxial cable, causing the signal to leak out around the cable. Leakage cables can be implemented to optimize signal transmission characteristics in the GNSSL1 frequency range.

[0033] Leaky cables have the characteristic of linearly decreasing signal intensity as the signal is transmitted. Therefore, the pseudo-GNSS signal 122 output from the remote device 120 decreases linearly in intensity as it is transmitted along the leaky cable. According to one embodiment of the present invention, by arranging leaky cables side by side and transmitting the pseudo-GNSS signal 122 in opposite directions to each other, it is possible to receive a pseudo-GNSS signal 122 of a predetermined size or larger at any location. Therefore, according to one embodiment of the present invention, it is possible to maintain a signal-to-noise ratio (SNR) above a predetermined level throughout the entire GNSS shadowed area 102 using leaky cables.

[0034] The tunnel environment is extremely barren, dusty, and experiences extreme temperature fluctuations. Temperature changes inside the tunnel are almost identical to those in the external environment. Therefore, even if industrial PCs are used, it is impossible to operate the equipment 24 hours a day, 365 days a year inside the tunnel. Furthermore, the system becomes difficult to maintain because there are maintenance and repair points at each location. According to one embodiment of the present invention, processing units requiring numerous calculations are located in a main device 110 provided inside the tunnel or in a separate space outside, and a remote device 120 with only minimal hardware is located inside the tunnel, thereby improving the durability of the system while making maintenance and repair easier.

[0035] Furthermore, according to one embodiment of the present invention, the remote device 120 may include a radar (RADAR; radio detection and ranging) sensor. The remote device 120 can use the radar sensor to identify a vehicle traveling in a tunnel and detect the vehicle's speed. The remote device 120 can transmit the vehicle information and vehicle speed information detected using the radar sensor to the main device 110. The main device 110 can use the vehicle information and vehicle speed information obtained from the remote device 120 to determine the attributes of the pseudo-GNSS signal output from the remote device 120. With this configuration, the pseudo-GNSS signal output system 100 according to one embodiment of the present invention can output a pseudo-GNSS signal that reflects the vehicle's driving state, thereby improving the reception rate of the pseudo-GNSS signal of the vehicle.

[0036] Figure 2 is a diagram showing the configuration of the main device and remote device according to one embodiment of the present invention.

[0037] According to one embodiment of the present invention, the main device 110 includes a processor 210, a communication module 212, and a memory 214.

[0038] The main device 110 may be located in a predetermined space outside or inside the tunnel. The main device 110 may be located in a position where it can communicate with the outside and receive satellite signals 142.

[0039] The communication module 212 can communicate with external devices via wired or wireless means. The communication module 212 can communicate with a server and multiple remote devices 120. The communication module 212 can communicate with the server and multiple remote devices 120 using different communication methods. The communication module 212 can perform short-range communication and may utilize, for example, Bluetooth®, BLE (Bluetooth Low Energy), Near Field Communication, WLAN (WiFi), Zigbee, infrared (IrDA, infrared Data Association) communication, WFD (Wi-Fi Direct), UWB (ultra wideband), Ant+ communication, etc. As another example, the communication module 212 can utilize mobile communication and send and receive wireless signals to and from at least one of a base station, an external terminal, or a server on a mobile communication network.

[0040] The communication module 212 can communicate with the remote device 120. According to one embodiment of the present invention, the communication module 212 can perform optical communication with the remote device 120 via an optical fiber cable or a coaxial cable. The communication module 212 may include a converter that converts a digital signal generated by the processor 210 into an optical signal, or a converter that converts a signal received via optical communication into a digital signal. For example, the communication module 212 may include an RF (Radio frequency) to Optic Converter.

[0041] Furthermore, the communication module 212 can communicate with the server. The communication module 212 can receive future GNSS navigation information from the server. The communication module 212 can receive GNSS navigation information from the server at predetermined intervals.

[0042] The processor 210 controls the overall operation of the main unit 110. The processor 210 may include one or more processors.

[0043] The processor 210 controls the communication module 212 to receive GNSS navigation information from the server. The processor 210 requests GNSS navigation information from the server at predetermined intervals and receives GNSS navigation information from the server. The processor 210 can receive GNSS navigation information from the server at various defined intervals, such as one week or one month. The processor 210 can connect to multiple servers to receive GNSS navigation information relating to multiple satellites 140. For example, the processor 210 can receive GNSS navigation information relating to the first satellite from the first server and GNSS navigation information relating to the second satellite from the second server. The timing and interval of receiving GNSS navigation information may differ for each server. For example, GNSS navigation information relating to the first satellite may be received every Monday at 9:00 AM at one-week intervals, and GNSS navigation information relating to the second satellite may be received every 10 days at 10:00 AM on the 1st of each month.

[0044] According to one embodiment of the present invention, the processor 210 can generate pseudo-GNSS signal information using GNSS navigation information received from a server. The processor 210 can generate pseudo-GNSS signal information relating to each of the multiple remote devices 120. The processor 210 can also generate pseudo-GNSS signal information relating to each of the multiple satellites. The processor 210 can generate pseudo-GNSS signal information reflecting the position of each remote device 120 using the GNSS navigation information. The processor 210 can transmit the generated pseudo-GNSS signal information to each remote device 120 via the communication module 212.

[0045] The processor 210 can generate IQ phase data using GNSS navigation information. IQ phase data is data containing information about the amplitude and phase of in-phase and quadrature carriers used for quadrature amplitude modulation (QAM). The processor 210 generates IQ phase data corresponding to the current position and current time using GNSS navigation information, and generates pseudo-GNSS signal information including IQ phase data. The processor 210 generates IQ phase data synchronized with the current time.

[0046] According to one embodiment of the present invention, the main device 110 can receive location and speed information of a vehicle in a tunnel from the remote device 120. The processor 210 can generate pseudo-GNSS signal information based on the location and speed information of the vehicle received from the remote device 120. The processor 210 can adjust the direction or angular range of the pseudo-GNSS signal output from the remote device 120 based on the location and speed information of the vehicle. The processor 210 can generate pseudo-GNSS signal information including information about the direction or angular range of the pseudo-GNSS signal and transmit it to the remote device 120.

[0047] Memory 214 may store information, signals, data, instructions, or programs necessary for the operation of the main unit 110. Memory 214 may include one or a combination of volatile memory and non-volatile memory. Memory 214 may include at least one type of recording medium from among flash memory type, hard disk type, multimedia card micro type, card type memory (e.g., SD or XD memory), RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory), magnetic memory, magnetic disk, and optical disk. Memory 214 may also support web storage or cloud servers that perform storage functions over the internet.

[0048] Memory 214 stores information about the server providing GNSS navigation information for each satellite, as well as information about the update cycle and update time. The processor 210 can obtain GNSS navigation information from the server using the information about the server providing GNSS navigation information for each satellite, as well as the update cycle and update time stored in memory 214. The server information providing GNSS navigation information may include, for example, the server name, server proximity address, authentication information for connecting to the server, the protocol for communicating with the server, and the server operator.

[0049] The processor 210 stores and manages GNSS navigation information received via the communication module 212 in memory 214. For example, the processor 210 can store and manage information in memory 214 such as the last update time of the GNSS navigation information stored in memory 214, information on how long the GNSS navigation information is retained, the source of the GNSS navigation information, and the types and number of satellites from which GNSS navigation information is currently available from memory 214. The processor 210 may update the GNSS navigation information management information in memory 214 each time it updates the GNSS navigation information received from the server.

[0050] The processor 210 can store and manage information about multiple remote devices 120 and information about connection paths in the memory 214. The processor 210 can also receive status information from multiple remote devices 120 and manage their status. The processor 210 can periodically receive status information from multiple remote devices 120, or receive status information from multiple remote devices 120 when an event such as an error occurs in one of them. The status information of multiple remote devices 120 may include, for example, the power on / off status of the remote devices 120, and their operating modes (e.g., normal mode, GNSS navigation information update mode, abnormal mode, etc.).

[0051] Each of the multiple remote devices 120 may have identification information. The main device 110 can store and manage the identification information, location information, etc., of the multiple remote devices 120.

[0052] The remote device 120 may include a processor 220, a communication module 222, a memory 224, a radar device 226, and a pseudo-GNSS signal output device 228. Each of the multiple remote devices 120 may correspond to the structure of the remote device 120 shown in Figure 2. The multiple remote devices 120 may be arranged at a first interval within the tunnel. The intervals between the multiple remote devices 120 may be constant or individually set differently from one another. For example, the multiple remote devices 120 may be arranged at a first interval in straight sections of the roadway within the tunnel, and at a shorter interval than the first interval in curved sections of the roadway within the tunnel.

[0053] The communication module 222 can communicate with external devices via wired or wireless means. The communication module 222 can communicate with the main device 110. According to one embodiment of the present invention, the communication module 222 can communicate with other remote devices 120.

[0054] According to one embodiment of the present invention, the communication module 222 can perform short-range communication and may utilize, for example, Bluetooth, BLE (Bluetooth Low Energy), Near Field Communication, WLAN (WiFi), Zigbee, infrared data association (IrDA) communication, WFD (Wi-Fi Direct), UWB (ultra wideband), Ant+ communication, etc. As another example, the communication module 222 can utilize mobile communication and send and receive radio signals to and from at least one of a base station, an external terminal, or a server on a mobile communication network.

[0055] The communication module 222 can communicate with the main device 110. According to one embodiment of the present invention, the communication module 222 can perform optical communication with the main device 110 via an optical fiber cable or a coaxial cable. The communication module 222 may include a converter that converts a digital signal generated by the processor 220 into an optical signal, or a converter that converts a signal received via optical communication into a digital signal. For example, the communication module 222 may include an Optic to RF Converter.

[0056] Furthermore, according to one embodiment of the present invention, the communication module 222 can communicate with a vehicle traveling in the roadway inside the tunnel. The communication module 222 can communicate with the vehicle inside the tunnel using short-range communication methods such as Bluetooth, BLE, short-range wireless communication, WLAN, ZigB, infrared communication, WFD, UWB, and Ant+ communication.

[0057] The processor 220 can control the overall operation of the remote device 120. The processor 220 may include one or more processors.

[0058] The processor 220 receives pseudo-GNSS signal information from the main device 110 via the communication module 222. The processor 220 may receive pseudo-GNSS signal information periodically or in real time. The processor 220 may store the received pseudo-GNSS signal information in the memory 224 or transmit it to the pseudo-GNSS signal output device 228.

[0059] Memory 224 may store information, signals, data, instructions, or programs necessary for the operation of the remote device 120. Memory 224 may include one or a combination of volatile memory and non-volatile memory. Memory 224 may include at least one type of recording medium from among flash memory type, hard disk type, multimedia card micro type, card type memory (e.g., SD or XD memory), RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory), magnetic memory, magnetic disk, and optical disk. Memory 224 may also support web storage or cloud servers that perform storage functions over the internet.

[0060] According to one embodiment of the present invention, the memory 224 can store pseudo-GNSS signal information received from the main device 110.

[0061] The radar system 226 detects vehicles traveling in the tunnel using radar signals. The radar system 226 includes a radar sensor. The radar sensor can generate electromagnetic waves, output them toward an object, and detect the distance to and direction of the object through the returning electromagnetic waves. The radar sensor is a type of ToF (Time of Flight) sensor. The radar system 226 can transmit the vehicle detection signal detected by the radar signal to the processor 220.

[0062] The processor 220 receives vehicle detection signals from the radar device 226 and can identify the vehicle's position and speed. The processor 220 uses the vehicle detection signals to identify the vehicle's position over time. The processor 220 can also calculate the speed of each vehicle based on its position over time. The processor 220 can transmit the identified vehicle position information and vehicle speed information to the main device 110 via the communication module 222.

[0063] The pseudo-GNSS signal output device 228 generates and outputs a pseudo-GNSS signal using pseudo-GNSS signal information received from the main device 110. According to one embodiment of the present invention, the pseudo-GNSS signal output device 228 may include a signal generation module 230 and a GNSS antenna 232.

[0064] The signal generation module 230 can generate a pseudo-GNSS signal from pseudo-GNSS signal information. The pseudo-GNSS signal information may include IQ phase data. The signal generation module 230 modulates the GNSSL1 carrier signal based on the IQ phase data to generate a pseudo-GNSS signal. The L1 frequency of the L1 carrier is determined to be 1575.42 MHz for GPS, 1602.0~1615.5 MHz for GLONASS, 1561.1 MHz for Beidou, 1575.42 MHz for QZSS, and 1176.45 MHz for IRNSS. The pseudo-GNSS signal output device 228 can be embodied in various forms, such as an analog circuit that generates and processes analog signals, or a microcontroller. The signal generation module 230 can also be implemented in the form of an SDR (software-defined radio) device having an RF transceiver, such as an FPGA-based transceiver (BladeRF, etc.), an ARM core-based transceiver (HackRF, etc.), an Intel core-based transceiver, or an AMD core-based transceiver. The signal generation module 230 outputs the generated pseudo-GNSS signal to the GNSS antenna 232.

[0065] The signal generation module 230 can generate a pseudo-GNSS signal synchronized with the real-time satellite signal output from the satellite 140. The main device 110 can measure the optical delay to a plurality of remote devices 120. According to one embodiment of the present invention, the main device 110 can periodically transmit delay measurement messages, receive response messages to the delay measurement messages from the remote devices 120, and measure the optical delay. Based on the optical delay value of each remote device 120, the main device 110 transmits pseudo-GNSS signal information that reflects the optical delay value to the remote devices 120 so as to output a pseudo-GNSS signal synchronized with the real-time satellite signal. For example, the main device 110 may insert pseudo-GNSS signal output timing information into the pseudo-GNSS signal information. Alternatively, for example, the main device 110 may stream the pseudo-GNSS signal information to the remote devices 120, reflecting the optical delay value.

[0066] According to one embodiment of the disclosure, the signal generation module 230 can generate C / A codes that reflect optical delay. The signal generation module 230 can define the location of each remote device 120 in accordance with the optical delay. The signal generation module 230 can generate C / A codes corresponding to the location of each remote device 120 defined by the optical delay. The signal generation module 230 can generate IQ data using the generated C / A codes.

[0067] The signal generation module 230 can generate pseudo-GNSS signals for each satellite. The pseudo-GNSS signal information may include pseudo-GNSS signal information for multiple satellites.

[0068] The GNSS antenna 232 outputs a pseudo-GNSS signal. The GNSS antenna 232 may include multiple GNSS antennas that output signals independently of each other. The multiple GNSS antennas may output pseudo-GNSS signals corresponding to different satellites.

[0069] The GNSS antenna 232 can be implemented as a highly directivity directional antenna. Alternatively, the GNSS antenna 232 can be implemented as an antenna with an adjustable angular range for the azimuth angle of the output signal. The GNSS antenna 232 may, for example, have a reflector attached to its back. The GNSS antenna 232 may include, for example, a collinear antenna.

[0070] Figure 3 is a flowchart showing a pseudo-GNSS signal output method according to one embodiment of the present invention.

[0071] A pseudo-GNSS signal output method according to one embodiment of the present invention can be performed by a pseudo-GNSS signal output system 100 including a main device 110 and a plurality of remote devices 120. In this invention, the present invention will mainly describe an embodiment in which the pseudo-GNSS signal output system 100 according to one embodiment of the present invention performs the pseudo-GNSS signal output method, but the embodiments of the present invention are not limited thereto.

[0072] Referring to Figure 3, in step S302, the remote device 120 outputs a radar signal. The remote device 120 outputs a radar signal in the direction of the road inside the tunnel and transmits or outputs a radar signal to a moving vehicle. Multiple remote devices 120 may each output a radar signal.

[0073] In step S304, the remote device 120 detects radar signals reflected from the vehicle and uses the detected radar signals to recognize the vehicle's position and speed. The remote device 120 can identify the vehicle's position using the detected radar signals. The remote device 120 can also calculate the change in the vehicle's position over time and detect the speed of each vehicle.

[0074] According to one embodiment of the present invention, the remote device 120 can detect lane information when detecting the position of a vehicle. The remote device 120 can identify the lane of each vehicle based on the vehicle's coordinates. The vehicle's position information may include lane information. The remote device 120 can also calculate the average speed for each lane. The remote device 120 can calculate the speed for each lane using the vehicle speed detected in each lane.

[0075] In step S306, the remote device 120 transmits the detected vehicle's position and speed to the main device 110. According to one embodiment of the present invention, the remote device 120 may transmit the vehicle's position and speed to the main device 110 via optical communication through an optical fiber cable.

[0076] In step S308, the main device 110 can determine the magnitude of the azimuth angle and the output power of the GNSS antenna 232 that outputs a pseudo-GNSS signal from the remote device 120, based on the vehicle's position and speed received from the remote device 120. The main device 110 can determine the magnitude of the azimuth angle and the output power of the GNSS antenna 232 for each of the multiple remote devices 120.

[0077] The main unit 110 can determine the magnitude of the azimuth angle based on the vehicle speed received from the remote unit 120. The main unit 110 can set the magnitude of the azimuth angle to be larger as the vehicle speed increases. Sufficient antenna exposure time (dwell time) is required for the vehicle to receive the GNSS signal. When the vehicle speed is high, the azimuth angle of the GNSS antenna 232 must be large in order to have sufficient antenna exposure time. The main unit 110 can ensure sufficient antenna exposure time for each vehicle by adjusting the azimuth angle of the GNSS antenna 232 according to the vehicle speed. The magnitude of the azimuth angle of the GNSS antenna 232 can increase as the vehicle speed increases.

[0078] Furthermore, according to one embodiment of the present invention, the main device 110 can adjust the output power of the GNSS antenna 232 according to the vehicle speed. The main device 110 can increase the output power of the GNSS antenna 232 as the magnitude of the azimuth angle increases. As the magnitude of the azimuth angle increases, the output range of the output signal widens, and therefore higher output power is required.

[0079] According to one embodiment of the present invention, the main device 110 can store a lookup table that stores the magnitude of the GNSS antenna azimuth angle and the output power value based on the vehicle speed. The main device 110 can use the lookup table to determine the magnitude of the GNSS antenna azimuth angle and the output power value based on the vehicle speed.

[0080] The main unit 110 can receive vehicle position and speed information from the remote units 120 in real time or periodically. The main unit 110 can adjust the azimuth angle and output power of the GNSS antennas of each remote unit 120 in real time or periodically based on the vehicle position and speed information.

[0081] Furthermore, in stage S310, the main device 110 may generate pseudo-GNSS signal information. The main device 110 may generate pseudo-GNSS signal information using GNSS navigation information. The main device 110 may generate IQ data based on the C / A (Coarse Acquisition) code of the GNSS navigation information. The main device 110 may generate IQ data synchronized with satellite signals and reflecting the optical delay for each remote device 120. The main device 110 may generate pseudo-GNSS signal information including IQ data and GNSS antenna output information. The GNSS antenna output information may include the magnitude of the azimuth angle and output power of the GNSS antenna. The pseudo-GNSS signal information may be generated over time in real time or periodically.

[0082] According to one embodiment of the present invention, the main device 110 generates IQ data in the form of QPSK (Quardratic phase-shift keying). The main device 110 transmits a C / A code to the Q phase of the IQ data and inserts the C / A code and an arbitrary P (Precise) code to the I phase. In this case, the C / A code is a valid value, and the P code is a pseudo-P code and is also an invalid P code.

[0083] When generating pseudo-GNSS signals, it is possible to generate and output BPSK (Binary phase-shift keying) signals based on publicly available C / A codes. However, in such cases, older GNSS signal receivers or precision receivers from before 2017 have no problem receiving these pseudo-GNSS signals, but the latest GPS receivers have problems receiving them. Older GNSS signal receivers use a method that extracts the GNSS signal according to the RF signal emitted in BPSK form. However, the latest GNSS receivers, due to the improved performance of their RF receivers, use a method that separates the I / Q signals after reception and decodes only the Q signal into CDMA. Generally, signals transmitted in BPSK form perform properly only when received in BPSK form, and signals transmitted in QPSK form perform properly only when received in QPSK form. It is unclear whether multiple BPSK signals are transmitted for each satellite, or whether they are combined with a QPSK signal and transmitted, and this information is a security matter and is not made public.

[0084] According to one embodiment of the present invention, when transmitting a pseudo-GNSS signal, the pseudo-GNSS signal can be output in a QPSK form having an I / Q configuration in which a C / A code is transmitted in the Q phase and a C / A code and an arbitrary P code are transmitted in the I phase. For this purpose, the main device 110 can generate IQ data in QPSK form, and the remote device 120 can generate and output a pseudo-GNSS signal in QPSK form. Even if the vehicle can normally receive an arbitrary P code, a typical receiver cannot decode the P code, so malfunctions or misrecognition of location due to arbitrary P codes do not occur. However, by outputting such a pseudo-GNSS signal in QPSK form, the decoding speed of the C / A code in the Q phase at the vehicle's receiver is increased. For example, when transmitting a GPSL1 signal, the decoding speed of the GPS signal was faster when both the I phase and Q phase were transmitted in a QPSK form signal compared to when the C / A code was transmitted in the Q phase in a BPSK form signal. Therefore, according to one embodiment of the present invention, by generating IQ data in QPSK format and generating and outputting a pseudo-GNSS signal, it is possible to increase the success rate of receiving the pseudo-GNSS signal in the vehicle and improve the decoding speed.

[0085] In step S312, the main device 110 transmits pseudo-GNSS signal information to the remote devices 120. The main device 110 can convert the pseudo-GNSS signal information into an optical signal and transmit it to multiple remote devices 120 via an optical cable.

[0086] In step S314, the remote device 120 can generate a pseudo-GNSS signal based on the pseudo-GNSS signal information received from the main device 110. The remote device 120 can generate a pseudo-GNSS signal using the IQ data included in the pseudo-GNSS signal information. Furthermore, the remote device 120 can control the azimuth angle and output power of the GNSS antenna 232 using the GNSS antenna output information included in the pseudo-GNSS signal information.

[0087] Figure 4 is a diagram showing the arrangement and connection structure of a main device and remote devices according to one embodiment of the present invention. Figure 4 illustrates an embodiment in which one main device 110 and eight remote devices 120 are arranged. However, the embodiments of the present invention are not limited thereto, and the number of remote devices 120 can be determined in various ways depending on the embodiment.

[0088] According to one embodiment of the present invention, the main device 110 may be located on the entrance side of the tunnel 410. The remote devices 120 may be located at equal intervals from the entrance of the tunnel 410. Multiple remote devices 120 may be located, for example, at intervals of 150 m.

[0089] The main unit 110 and each remote unit 120 may include an optical distribution box 420. The optical distribution box 420 is connected to an optical cable and transmits signals output from the device to the optical cable, or transmits signals transmitted via the optical cable to the device. The optical distribution box 420 terminates the connected optical cable with a connector and connects to the actual device. The main unit 110 and each remote unit 120 are connected to the optical cable via the optical distribution box 420. The optical distribution box 420 of the main unit 110 may be connected to two 8-core optical cables (optical cable 8C). An 8-core optical cable may consist of four 2-core optical cables.

[0090] The 8-core optical cable 440a connected to the first terminal of the optical distribution box 420 of the main device 110 is connected to the first optical connection box 430a. The 8-core optical cable 440b connected to the second terminal of the optical distribution box 420 is connected to the second optical connection box 430b. When an 8-core optical cable is input to the first optical connection box 430a and the second optical connection box 430b, they distribute it into four 2-core optical cables and connect each strand to the others.

[0091] The four 2-core optical cables distributed from the first optical junction box 430a are each connected to the first to fourth remote devices 120 from the input. The four 2-core optical cables distributed from the second optical junction box 430b are each connected to the fifth to eighth remote devices 120 from the input. The 2-core optical cables can be connected to the optical distribution box 420 of each remote device 120.

[0092] The pseudo-GNSS signal output system 100 may include a power cable supplying power to a plurality of remote devices 120. According to one embodiment of the present invention, a first power cable 450 may be connected to the first to fifth five remote devices 120 from the entrance. A second power cable 452 may be connected to the fifth to eighth four remote devices 120 from the entrance. The first power cable 450 may be powered from a power source outside the tunnel 410. The second power cable 452 may be powered by power transmitted from the fifth remote device 120 via the first power cable 450. The first power cable 450 is also a cable with a higher current capacity than the second power cable 452. For example, the first power cable 450 is a 6SQ power cable, and the second power cable 452 is a 4SQ power cable.

[0093] Figure 5 is a diagram illustrating the process of measuring optical delay and generating pseudo-GNSS signal information that reflects the optical delay using one embodiment of the present invention.

[0094] According to one embodiment of the present invention, in step S502, the main device 110 periodically measures the optical delay time of each remote device 120a, 120b, and 120c. The main device 110 transmits a delay measurement message S1 to each remote device 120a, 120b, and 120c. The main device 110 may transmit the delay measurement message S1 to the multiple remote devices 120a, 120b, and 120c simultaneously or sequentially. The main device 110 receives response messages S2 to the delay measurement message S1 from the multiple remote devices 120a, 120b, and 120c. The main device 110 can measure the optical delay time by measuring the delay time between the response messages S2 to the delay measurement message S1. Based on the response messages S2 of each remote device 120a, 120b, and 120c, the main device 110 can measure the optical delay time related to each remote device 120a, 120b, and 120c.

[0095] Next, in step S504, the main device 110 synchronizes the pseudo-GNSS signal output timing with each of the remote devices 120a, 120b, and 120c, taking into account the optical delay time. The main device 110 can determine the timing for transmitting the pseudo-GNSS signal information to each of the remote devices 120a, 120b, and 120c, taking into account the optical delay time.

[0096] According to one embodiment of the present invention, the optical delay time may correspond to a delay time that reflects the delay time for each remote device 120a, 120b, and 120c to generate and output a pseudo-GNSS signal from the pseudo-GNSS signal information, and the delay time for the pseudo-GNSS signal information to be transmitted to each remote device 120a, 120b, and 120c via the optical cable.

[0097] Next, in step S506, the main device 110 can generate pseudo-GNSS signal information whose pseudo-GNSS signal output timing is synchronized to reflect the optical delay time, and transmit it to the respective remote devices 120a, 120b, and 120c. The main device 110 can transmit the pseudo-GNSS signal information to the respective remote devices 120a, 120b, and 120c at a timing earlier by the optical delay time so that the pseudo-GNSS signal is output in synchronization with the satellite signal at the respective remote devices 120a, 120b, and 120c. According to one embodiment of the present invention, the main device 110 can stream the pseudo-GNSS signal information to the respective remote devices 120a, 120b, and 120c at a timing earlier by the optical delay time.

[0098] Figure 6A shows a perspective view of the remote device with the cover open, according to one embodiment of the present invention. Figure 6B shows the front view of the remote device with the cover closed.

[0099] According to one embodiment of the present invention, the remote device 120 may include a fixing member 610 that is fixed to the wall or ceiling of the tunnel 410. The fixing member 610 may have a structure that is coupled to the housing of the remote device 120 and can be fixed to the wall or ceiling by fastening means such as screws or nails.

[0100] The remote device 120 may include a radar antenna 620 and a plurality of GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2 on its front side facing the ground towards the vehicle from the top of the tunnel 410. The plurality of GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2 may independently output signals. The circuit section of the radar device 226 and the signal generation module 230 may be housed inside the housing of the remote device 120.

[0101] The radar antenna 620 outputs radar signals in the direction of the roadway and can detect radar signals reflected from vehicles. The radar device 226 can process the radar signals detected via the radar antenna 620 and transmit them to the processor 210.

[0102] Figure 7 is a diagram showing an embodiment of the present invention that outputs pseudo-GNSS signals for each lane.

[0103] Multiple GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2 can output pseudo-GNSS signals related to different lanes. For example, GNSS antennas 232a1 and 232a2 can output pseudo-GNSS signal 710a related to the first lane L1. GNSS antennas 232b1 and 232b2 can output pseudo-GNSS signal 710b related to the second lane L2. GNSS antennas 232c1 and 232c2 can output pseudo-GNSS signal 710c related to the third lane L3. GNSS antennas 232d1 and 232d2 can output pseudo-GNSS signal 710d related to the fourth lane L4.

[0104] Multiple GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2, being directional, can independently output pseudo-GNSS signals to target lanes, allowing for individual adjustment of the azimuth angle and output power of the pseudo-GNSS signal for each lane. As a result, the pseudo-GNSS signal output system 100 can individually adjust the azimuth angle and output power of the pseudo-GNSS signal according to the vehicle speed in each lane, thereby increasing the success rate of pseudo-GNSS signal reception while also increasing energy efficiency.

[0105] According to one embodiment of the present invention, the pseudo-GNSS signal may include lane information. For example, the pseudo-GNSS signal may include lane information in its header information. The pseudo-GNSS signal output for each lane may include lane information corresponding to that lane. According to one embodiment of the present invention, the remote device 120 may generate a pseudo-GNSS signal corresponding to each lane and insert lane information into each pseudo-GNSS signal.

[0106] Figure 8 is a diagram showing an embodiment of the present invention in which pseudo-GNSS signals are output to the front and rear of a tunnel.

[0107] According to one embodiment of the present invention, multiple GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2 can output pseudo-GNSS signals to the front and rear of the tunnel 410. Figure 8 illustrates the output process of the pseudo-GNSS signal related to the first lane L1. The second lane L2, the third lane L3, and the fourth lane L4 can also output pseudo-GNSS signals to the front and rear, as described in Figure 8. The front may mean the direction of the exit of the tunnel 410, and the rear may mean the direction of the entrance of the tunnel 410.

[0108] According to one embodiment of the present invention, the GNSS antenna 232a1 can output a first forward output signal 710a1 in front of the tunnel 410. The GNSS antenna 232a2 can output a first rear output signal 710a2 behind the tunnel 410. According to one embodiment of the present invention, the pseudo-GNSS signal output system 100 can expand the coverage of the pseudo-GNSS signal by the remote device 120 by outputting pseudo-GNSS signals in front and behind, respectively, using a GNSS antenna corresponding to the front and a GNSS antenna corresponding to the rear. Furthermore, by expanding the coverage of the pseudo-GNSS signal, the pseudo-GNSS signal output system 100 has the effect of increasing the success rate of reception when receiving the pseudo-GNSS signal in a vehicle.

[0109] Furthermore, according to one embodiment of the present invention, each of the GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2 can adjust the magnitude of the azimuth angle 810a1, 810a2 of the pseudo-GNSS signal. The signal generation module 230 can adjust the magnitude of the azimuth angle of each of the GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2. For example, the magnitude of the azimuth angle may be set differently depending on the speed of the vehicles in each lane L1, L2, L3, and L4.

[0110] Furthermore, according to one embodiment of the present invention, the azimuth angles 810a1 and 810a2 of the forward output signal 710a1 and the rear output signal 710a2 of the GNSS antennas 232a1, 232a2, 232b1, 232b2, 232c1, 232c2, 232d1, and 232d2 can be set differently from each other. Also, the output powers of the forward output signal 710a1 and the rear output signal 710a2 can be set differently from each other.

[0111] Figure 9 is a block diagram showing the structure of a remote device according to one embodiment of the present invention.

[0112] According to one embodiment of the present invention, the remote device 120 may include a processor 220, a communication module 222, a memory 224, a radar device 226, a pseudo-GNSS signal output device 228, a camera 910, a BLE device 912, and a UWB device 914. Figure 9 will explain the differences from the block diagram in Figure 2 in particular.

[0113] Camera 910 can photograph vehicles traveling on the roadway. Camera 910 generates real-time video footage and visual information related to the roadway. Processor 220 can recognize vehicles from the video footage. Processor 220 can match vehicles recognized from the video footage with vehicles recognized from the detection signals of the radar device 226 and display the vehicle's position and speed on the video footage. Processor 220 can transmit the video footage to the main device 110.

[0114] According to one embodiment of the present invention, the main device 110 or the remote device 120 can identify the vehicle number of a vehicle using the video footage captured by the camera 910. The main device 110 or the remote device 120 can recognize the vehicle number on the vehicle number plate and match the identified vehicle with the vehicle number. The main device 110 can collect vehicle location, speed, and vehicle number information.

[0115] The BLE device 912 outputs a BLE beacon (or BLE anchor). By outputting a BLE beacon, the BLE device 912 can provide location information within the tunnel as identification information via the BLE beacon.

[0116] According to one embodiment of the present invention, a vehicle may pre-store a BLE map showing the location of each BLE device 912 within the tunnel 410. Upon receiving a BLE beacon, the vehicle may identify its location within the tunnel using the identification information in the BLE beacon and the pre-stored BLE map. The vehicle may pre-install a predetermined program or application and utilize information or functions stored in the program or application. The vehicle's program or application may use BLE beacons to identify its location within the tunnel.

[0117] According to one embodiment of the present invention, a vehicle can determine the reception angle of a BLE signal using the RSSI phase of the BLE signal. The vehicle can also measure the attenuation of the BLE signal using the RSSI value and determine the distance from the BLE device 912. The vehicle can detect its position based on a BLE map, the RSSI phase of the BLE signal, and the RSSI value of the BLE signal using a program or application.

[0118] The UWB device 914 can perform UWB communication with a vehicle. If the vehicle has UWB communication capabilities, it can obtain location information within the tunnel by receiving UWB signals output from the UWB device 914. Since UWB signals are directional, the vehicle can determine its location by receiving UWB signals from at least four locations. For example, if the UWB signals transmit location information and transmission time corresponding to each signal, the vehicle can obtain its own location information based on the delay time and location information of each UWB signal. Furthermore, according to one embodiment of the present invention, the vehicle can store UWB map information including the location information of the UWB device 914. The vehicle can detect its own location using the UWB map information and UWB signals output from four or more UWB devices.

[0119] According to one embodiment of the present invention, the remote device 120 is provided together with an LED device arranged for the illumination of the tunnel 410. For example, the remote device 120 may be implemented integrally with the LED device. By implementing the remote device 120 integrally with the LED device, ease of installation may be improved.

[0120] According to one embodiment of the present invention, the remote devices 120 are arranged at a first interval, and sub-remote devices (not shown) including BLE devices 912 and UWB devices 914 may be arranged between the remote devices 120 at a second interval shorter than the first interval. For example, the remote devices 120 may be arranged at a first interval of 150 m, and the sub-remote devices may be arranged at a second interval of 20 m. For example, 5 to 7 sub-remote devices may be arranged between two remote devices 120. Since BLE and UWB have short signal ranges, the performance of BLE and UWB communication can be improved by further arranging sub-remote devices in the tunnel at 20 m intervals.

[0121] Furthermore, according to one embodiment of the present invention, the remote device 120 may include a plurality of radar reflectors (not shown) that reflect radar signals output from the radar device 226. The radar reflectors can accurately reflect signals from the opposite side in the opposite direction. In the case of short-range radar, the range can reach up to about 100m, but by amplifying the radar signal using radar reflectors, the range of the radar signal can be extended to about 150m. The remote device 120 can increase the range of the radar signal by using radar reflectors.

[0122] On the other hand, the disclosed embodiments can be embodied in the form of a computer-readable recording medium that stores computer-executable instructions and data. The instructions are stored in the form of program code and, when executed by a processor, can generate a predetermined program module and perform a predetermined operation. Furthermore, when executed by a processor, the instructions can perform a predetermined operation of the disclosed embodiments.

[0123] The embodiments disclosed with reference to the attached drawings have been described above. Those with ordinary skill in the art to which the present invention pertains will understand that the present invention can be carried out in forms different from those disclosed without altering the technical idea or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as restrictive. [Explanation of symbols]

[0124] 100 Pseudo-GNSS signal output systems 120 Remote control devices 120a, 120b, 120c Remote control devices 122 Pseudo GNSS signal 130 GNSS Shaded Area 140 satellites 142 Satellite Signal 150 client devices

Claims

1. The main equipment is installed outside the tunnel, It includes a plurality of remote devices installed at first intervals inside the tunnel and communicating with the main device, Each of the aforementioned multiple remote devices is: A radar device that outputs a radar (RADAR; radio detection and ranging) signal and detects radar signals reflected from an object, At least one pseudo-GNSS signal output device, A communication module that communicates with the aforementioned main device, Includes a processor, The aforementioned processor, Using the radar signals detected by the radar device, the position and speed of the vehicle traveling inside the tunnel are recognized. The recognized vehicle's position and speed are transmitted to the main device via the communication module. The communication module receives pseudo-GNSS signal information from the main device. Using the pseudo-GNSS signal information, a pseudo-GNSS signal is generated and output via the at least one pseudo-GNSS signal output device. The main device determines the magnitude of the azimuth angle and the output power of the GNSS antenna that outputs the pseudo-GNSS signal, based on the position and speed of the vehicle received from each of the plurality of remote devices. The pseudo-GNSS signal information includes the magnitude of the azimuth angle and the output power. A pseudo-GNSS signal output system.

2. The main device, Each of the aforementioned multiple remote devices communicates via an optical fiber cable. A delay measurement message is sent to each of the aforementioned multiple remote devices to measure the optical delay, and a response message is received to the delay measurement message. Based on the response message, the optical delay between each of the multiple remote devices and the main device is measured. The pseudo-GNSS signal output system according to claim 1, which transmits the pseudo-GNSS signal information based on the optical delay.

3. The main device, The pseudo-GNSS signal output system according to claim 2, which generates a C / A code that reflects the optical delay of each of the remote devices in the GNSS signal information received from the server, and generates the pseudo-GNSS signal information including the generated C / A code.

4. The main device, The pseudo-GNSS signal is generated in an I / Q form modulated in QPSK (Quadratic phase-shift keying) form, The pseudo-GNSS signal output system according to claim 1, wherein the pseudo-GNSS signal includes a C / A code in the Q phase and a C / A code and an arbitrary P code in the I phase.

5. The pseudo-GNSS signal output device includes a plurality of directional GNSS antennas corresponding to each lane of the roadway within the tunnel, which output pseudo-GNSS signals to the corresponding lanes. The pseudo-GNSS signal output system according to claim 1, wherein the pseudo-GNSS signal includes lane information.

6. The pseudo-GNSS signal output device includes a forward GNSS antenna that outputs a pseudo-GNSS signal forward and a rear GNSS antenna that outputs a pseudo-GNSS signal rear, according to claim 5.

7. The processor in each of the aforementioned multiple remote devices Using the aforementioned radar signal, the speed of vehicles traveling in each lane of the roadway within the tunnel is recognized. The vehicle speed is transmitted to the main device via the communication module for each recognized lane. The pseudo-GNSS signal output system according to claim 5, wherein the main device adjusts the magnitude of the azimuth angle and output power of the GNSS antenna of each of the remote devices based on the speed of the vehicles in each of the recognized lanes.

8. Each of the aforementioned multiple remote devices includes a camera, The aforementioned processor, Based on the radar signal detected by the radar device and the video footage captured by the camera, the position, speed, and vehicle number of the vehicle traveling inside the tunnel are recognized. The pseudo-GNSS signal output system according to claim 1, which transmits the recognized vehicle's position, speed, and vehicle number to the main device.

9. Each of the aforementioned multiple remote devices is: The invention further includes a BLE device that outputs a Bluetooth® signal, The vehicles inside the aforementioned tunnel, The system stores BLE map information, which includes the location and identification information of each of the aforementioned multiple remote devices. Using the BLE map information and the RSSI phase of the Bluetooth® signal output from the BLE device, the angle at which the Bluetooth® signal was received from the BLE device is calculated. The pseudo-GNSS signal output system according to claim 1, which can measure the distance from the BLE device using the BLE map information and RSSI value.

10. Each of the aforementioned multiple remote devices is: The device further includes a UWB device that outputs a UWB signal, The vehicles inside the aforementioned tunnel, The system stores UWB map information including the location and identification information of each of the aforementioned multiple remote devices. The pseudo-GNSS signal output system according to claim 1, which can detect the position of the vehicle using the UWB map information and UWB signals output from four or more UWB devices.

11. In a pseudo-GNSS signal output method that outputs pseudo-GNSS signals from multiple remote devices placed inside a tunnel, The steps include: outputting radar signals from each of the aforementioned multiple remote devices' radar (RADAR; radio detection and ranging) devices; The step of recognizing the position and speed of a vehicle traveling inside a tunnel using radar signals detected by the aforementioned radar device, The steps include transmitting the recognized vehicle's position and speed to a main device located outside the tunnel, The steps include receiving pseudo-GNSS signal information from the main device, The process includes the step of generating and outputting a pseudo-GNSS signal via at least one pseudo-GNSS signal output device using the pseudo-GNSS signal information, The main device determines the magnitude of the azimuth angle and the output power of the GNSS antenna that outputs the pseudo-GNSS signal, based on the position and speed of the vehicle received from each of the plurality of remote devices. The pseudo-GNSS signal information includes the magnitude of the azimuth angle and the output power. Pseudo GNSS signal output method.

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