KR20230080370A - Method and apparatus for constructing terrestrial satellite navigation system using satellite navigation information - Google Patents

Abstract

The present invention relates to technology providing technology and methods for building a terrestrial satellite navigation system which links a terrestrial communication network with a satellite navigation signal generation system applying technology to generate a communication carrier modulating in-phase/quadrature-phase (I/Q) data or navigation messages of an intermediate frequency (IF), which is a digital data area of a satellite navigation system. According to an embodiment of the present invention in a process of resolving the shadow areas of a satellite navigation system, such as indoors, underground cities, tunnels, etc., some telecommunication companies can achieve a desired goal of providing a navigation signal generation system for using only communication media thereof or only the communication infrastructure of a specific telecommunication company. The apparatus comprises a satellite navigation signal generator and a satellite navigation signal receiver.

Description

Ground navigation system construction method and apparatus using satellite navigation system information

The present invention relates to a satellite navigation signal system using a frequency for communication on the ground, and more particularly, to a signal generator and receiver system for a satellite navigation system using a cellular network frequency for communication on the ground.

In the case of using a global satellite navigation system such as the existing GPS (Global Positioning System), GLONASS (Globalnaya Navigazionnaya Sputnikovaya Sistema, or Global Navigation Satellite System), BDS (BeiDou Navigation Satellite System), that is, GNSS (global navigation satellite system), A corresponding position can be accurately calculated only by a receiver capable of normally directly receiving signals from external navigation satellites, that is, a receiver in an outdoor environment. That is, the position, altitude, and speed of an object moving or stationary throughout the earth can be grasped using a plurality of artificial satellites and satellite signals transmitted from the satellites.

The GNSS system was developed for military purposes, but in recent years, it has been developed at the national level, such as navigation for all means of transportation, surveying, agriculture and earth science as well as emergency patient search and rescue, criminal location tracking, and response to natural disasters. It is used in a wide range of fields such as welfare and crisis management systems.

When positioning a user's location through GNSS, it is very important to accurately analyze a satellite signal received from a satellite to calculate the user's location. However, the satellite signal received from the satellite includes orbital error of the satellite, clock error between the receiver and the satellite, error due to the ionosphere and convection layer, or error due to multipath. It happens. In order to solve this problem, various positioning correction techniques such as DGPS (differential GPS) or RTK (real time kinematic), such as DGNSS (differential GNSS), have been developed and applied.

In addition, the Korea Positioning System (KPS), which is similar to Japan's QZSS and India's NAVIC, which is classified as a Regional Navigation Satellite System, unlike the global satellite navigation system, is based on satellite orbits deployed around Korea. In the case of a satellite navigation system capable of precise positioning using , it is possible to create new technologies and services through linkage with terrestrial communication networks.

Nevertheless, when a user's position is determined indoors through a satellite navigation system, it is impossible to accurately calculate the user's position because a signal does not reach the user's position from a satellite. Furthermore, since it is impossible to receive satellite signals indoors, it is impossible to apply the positioning correction technique.

To compensate for this, mixed positioning using MEMS (Microelectromechanical systems) type inertial sensors, image positioning using LIDAR and cameras, and signal processing of wireless communication systems such as Wi-Fi, Bluetooth, and UWB (ultra wide band) developed for communication purposes. By applying radio navigation technology using trilateration, which is similar to the satellite navigation system, research is being actively conducted to perform positioning for users located indoors. However, these technologies are used only as an aid and do not completely replace the satellite navigation system.

Therefore, recently, a technology for generating and transmitting navigation satellite signals on the ground has been developed, and this is designed to be compatible with actual navigation satellite signals by using real-time navigation satellite information based on a satellite navigation system simulator.

The present invention relates to a terrestrial navigation signal generation system that uses a technology for generating I/Q (in-phase/quadrature-phase) data of an intermediate frequency (IF), which is a digital data area of a satellite navigation system, in conjunction with a terrestrial communication network. It is intended to provide technology and methods for constructing a satellite navigation system for use. According to an embodiment of the present disclosure, in the process of resolving the shadow area of the satellite navigation system, such as indoors, underground cities, tunnels, etc., some carriers use only their own communication media or a navigation method for using only the communication infrastructure of a specific carrier. It is possible to achieve the desired goal of providing a signal generation system.

In order to achieve the above object, the navigation satellite signal system using a frequency for communication according to the present invention uses a frequency band used in a terrestrial communication network rather than the L band allocated to the existing satellite navigation system, and uses RF for communication containing navigation satellite data. It may include a navigation satellite signal generator for generating a signal, and a satellite navigation positioning receiver for receiving the navigation satellite signal generated by the navigation satellite signal generator and restoring satellite navigation data.

In one embodiment, the navigation satellite signal generator may include a receiving unit receiving satellite signals of a plurality of navigation satellites; a satellite navigation information storage unit for storing reference satellite navigation information for a plurality of navigation satellites including the plurality of navigation satellites; a navigation satellite selector selecting a navigation satellite having a poor reception state based on the received navigation signal; a satellite navigation information generating unit generating satellite navigation information for the selected navigation satellite based on the reference satellite navigation information for the selected navigation satellite among the reference satellite navigation information; and a communication converter for transmitting the signal including the generated satellite navigation information to a communication frequency by means of a modulation technique.

One embodiment of the present disclosure provides a memory that stores one or more instructions; and at least one processor executing the one or more instructions, wherein the at least one processor determines an object whose location is to be identified, receives orbital information of a navigation satellite, and receives orbital information of the navigation satellite, based on the orbital information of the navigation satellite. to generate a virtual navigation satellite that does not actually exist to correspond to the navigation satellite, obtain a signal of the virtual navigation satellite based on the virtual navigation satellite, track information of the navigation satellite, and signal of the virtual navigation satellite Based on the information, it is intended to provide a terrestrial satellite navigation system server that identifies the location of the object.

In one embodiment, the orbit information of the navigation satellite may include information about an actual orbit of the navigation satellite, synchronization time information of the navigation satellite, and atmospheric information related to the navigation satellite.

In one embodiment, the orbit information of the navigation satellite may be transmitted and received from at least one of a satellite navigation system ground station and the navigation satellite.

In one embodiment, even if the navigation satellite does not actually exist, a ground station system that generates and manages navigation satellite information is established and interlocked with a ground communication network to operate an independent ground satellite navigation system that can be operated only in a specific area indoors and outdoors. can build.

According to an embodiment of the present invention, an operator that has installed a navigation satellite signal generator infrastructure, for example, a KT, SKT, or U+ operator, can provide a terrestrial satellite navigation service only to its communication subscribers.

1 is a diagram illustrating a navigation satellite signal system using a communication frequency according to an embodiment of the present invention.
2 is a block diagram showing the configuration of an apparatus for generating a navigation satellite signal according to an embodiment of the present invention.
3 is a block diagram showing the configuration of a satellite navigation receiver according to an embodiment of the present invention.
4 is a diagram illustrating a terrestrial satellite navigation system according to an embodiment of the present invention.
5 is a diagram illustrating an operating concept of a terrestrial satellite navigation system according to an embodiment of the present invention.
6 is a diagram illustrating an actual navigation satellite and a virtual navigation satellite according to an embodiment of the present invention.

In order to clarify the technical spirit of the present disclosure, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the present disclosure, if it is determined that a detailed description of a related known function or component may unnecessarily obscure the subject matter of the present disclosure, the detailed description will be omitted. Elements having substantially the same functional configuration in the drawings are assigned the same reference numerals and reference numerals as much as possible, even though they are displayed on different drawings. For convenience of description, the device and method are described together if necessary. Each operation of the present disclosure need not necessarily be performed in the order described, and may be performed in parallel, selectively, or separately.

The terms used in the embodiments of the present disclosure have been selected from general terms that are currently widely used as much as possible while considering the functions of the present disclosure, but they may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technologies, and the like. . In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding embodiment. Therefore, the term used in this specification should be defined based on the meaning of the term and the overall content of the present disclosure, not a simple name of the term.

Throughout this disclosure, singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof exists, but that one or more other features, numbers, steps, operations, or configurations exist. It should be understood that it does not preclude the possibility of the presence or addition of elements, parts, or combinations thereof. That is, when a certain part "includes" a certain component in the entire present disclosure, it means that other components may be further included without excluding other components unless otherwise stated.

An expression such as "at least one" modifies the list of elements as a whole and does not modify the elements of the list individually. For example, "at least one of A, B, and C" and "at least one of A, B, or C" means only A, only B, only C, both A and B, both B and C, A and C All, A, B, and C, or a combination thereof.

In addition, terms such as "...unit" and "...module" described in this disclosure refer to a unit that processes at least one function or operation, which is implemented as hardware or software or a combination of hardware and software. can be implemented

Throughout the present disclosure, when a part is said to be “connected” to another part, this includes not only the case where it is “directly connected” but also the case where it is “electrically connected” with another element in between. do. In addition, when a part "includes" a certain component, it means that it may further include other components, not excluding other components unless otherwise stated.

The expression “configured to” used throughout this disclosure may mean, depending on the situation, for example, “suitable for”, “having the capacity to” )”, “designed to”, “adapted to”, “made to”, or “capable of” . The term “configured (or set) to” may not necessarily mean only “specifically designed to” hardware. Instead, in some contexts, the expression "a system configured to" may mean that the system "is capable of" in conjunction with other devices or components. For example, the phrase "a processor configured (or configured) to perform A, B, and C" can be used by a dedicated processor (eg, embedded processor) to perform those operations, or by executing one or more software programs stored in memory; It may mean a general-purpose processor (eg, CPU or application processor) capable of performing corresponding operations.

Throughout the present disclosure, a terminal or a terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. Of course, it is not limited to the above examples.

In addition to GNSS and GPS, a Regional Navigation Satellite System (RNSS) is being developed for the purpose of providing navigation services in a specific area. Representative systems as RNSS include India's Navigation with Indian Constellation (NAVIC), Japan's Quasi-Zenith Satellite System (QZSS), and Korea's Korean Positioning System (KPS). NAVIC consists of a total of 7 satellites, including 3 GEOs and 4 IGSOs with an orbital inclination of 5 degrees. QZSS will also operate with a total of seven satellites, including four GEOs and three IGSOs. Throughout the present disclosure, the satellite navigation system may include GNSS, GPS, RNSS, and the like. An embodiment of the present disclosure intends to provide a satellite navigation system combined with a terrestrial communication network.

1 relates to a navigation satellite signal system using a communication frequency according to an embodiment of the present invention.

Referring to FIG. 1 , the navigation satellite signal system includes a navigation satellite signal generator 100 and a navigation satellite signal receiver 200 . The navigation satellite signal generator 100 may generate a radio frequency (RF) signal for communication including navigation satellite in-phase quadrature-phase (I/Q) data using a frequency band used in a terrestrial communication network. In addition, the satellite navigation receiver 200 may receive the navigation satellite signal generated by the navigation satellite signal generator and restore navigation satellite signal data.

In one embodiment, the navigation satellite signal generator 100 uses a radio frequency (RF) signal for communication including navigation satellite signals and information by using a frequency band other than the L band allocated to the existing satellite navigation system and used in the terrestrial communication network. generate

The generated RF signal may be transmitted on a carrier by a 5G/6G converter. For example, a carrier may include a carrier using a 5G or 6G communication system. In addition, operators (eg, KT, SKT, and U+ operators) may have different carrier frequencies.

The satellite navigation receiver 200 may include an RF front-end unit, an ADC-to-TSN IF unit, and a SW TSN processing unit. In one embodiment, the navigation satellite receiver 200 may receive the navigation satellite signal generated by the navigation satellite signal generator 100 and restore the navigation satellite signal and data.

2 is a block diagram showing the configuration of an apparatus for generating a navigation satellite signal according to an embodiment of the present invention.

Referring to FIG. 2, the navigation satellite signal generator 100 includes a satellite signal receiver 101, a satellite navigation information storage unit 110, a current time storage unit 120, and a position relative to the corresponding satellite signal generator 100. It includes a location information storage unit 130 for storing information, a navigation satellite selection unit 140 for selecting navigation satellites, a satellite signal generation unit 150, a satellite signal conversion unit 160 and a security module 170.

The satellite signal receiver 101 receives satellite signals from a plurality of navigation satellites. The satellite signal receiver 101 may be, for example, a satellite navigation receiver. As described above, the satellite signal is an RF signal, and satellite navigation information (ephemeris, almanac, etc.) can be obtained by performing sampling and signal processing on the satellite signal. That is, the satellite signal received by the satellite signal receiver 101 includes satellite navigation information.

Among the received satellite signals for a plurality of navigation satellites, at least some of the satellite signals for the navigation satellites may be received abnormally, such as non-received or weak or distorted signal strength. That is, the satellite signal receiving unit 101 may receive a satellite signal in which at least some of the satellite signals necessary for positioning are incomplete.

Alternatively, all of the received satellite signals for the plurality of navigation satellites may be normally received. For example, in the case of a demonstration area for testing autonomous driving such as K-city, all satellite signals may be normally received because the height of the feature is not high.

The satellite navigation information storage unit 110 stores satellite navigation information for a plurality of navigation satellites including navigation satellites received by the satellite signal receiving unit 101 . That is, the satellite navigation information storage unit 110 includes not only satellite navigation information for navigation satellites that transmit satellite signals received from the satellite signal receiver 101, but also satellite navigation information located below the reference horizontal plane of the destination due to the structure of the earth. Satellite navigation information for navigation satellites is also stored.

In this specification, the satellite navigation information stored in the satellite navigation information storage unit 110 is referred to as "reference satellite navigation information".

The current time storage unit 120 stores the current time. The current time storage unit 120 may receive the current time from the satellite navigation receiver.

The location information storage unit 130 stores location information of the corresponding navigation satellite signal generator 100 . The location information storage unit 130 receives location information about the corresponding satellite signal generator 100 from an external control terminal (not shown) and sets the location information of the corresponding navigation satellite signal generator 100. Do it.

Meanwhile, the location information is measured in advance when the navigation satellite signal generator 100 is installed, received from a control terminal, or stored in the location information storage unit 130 of the navigation satellite signal generator 100 in advance. It can be. In addition, the location information may be newly set by the control terminal when the navigation satellite signal generator 100 is moved and installed from a current location to another location.

The navigation satellite selection unit 140 selects a navigation satellite that satisfies a predetermined condition from among navigation satellites corresponding to the reference satellite navigation information based on the reference satellite navigation information.

At this time, the current time stored in the current time storage unit 120 and the location information of the satellite signal generator 100 stored in the location information storage unit 130 may be used. Also, the navigation satellite selector 140 may select a navigation satellite based on the satellite signal received by the satellite signal receiver 101 .

The satellite signal generator 150 generates a satellite signal for the navigation satellite selected by the navigation satellite selector 140 . The generated satellite signal is a carrier modulated with IQ data or navigation message, and is transmitted through a 5G or 6G RF antenna for communication.

The satellite signal changing unit 160 changes the satellite signal of the navigation satellite selected by the navigation satellite selecting unit 140 among the satellite signals received by the satellite signal receiving unit 101 .

The security module 170 performs access control and encryption of transmitted/received messages (commands), and a network security protocol may be employed for wired/wireless communication.

The security module 170 supports security functions including access control (authentication) through an authentication process, encryption, or a combination thereof. For the above access control, authentication can be performed using a password, certificate, biometric information, one-time password (OTP), etc., and encryption and decryption algorithms can be used for security functions for message transmission and reception. It uses an asymmetric encryption technique that uses a public key and a private key (private key) for sending and receiving messages. Also, prepare for network security protocols, intrusion prevention, and DOS (Denial Of Service) attacks to strengthen security in wired and wireless communication.

3 is a block diagram showing the configuration of a navigation signal signal receiver according to an embodiment of the present invention.

Referring to FIG. 3 , the satellite navigation receiver 200 may include a receiver 210, a control unit 220, and a storage unit 230.

The receiver 210 receives a navigation satellite signal through a communication frequency from the navigation satellite signal generator (100 in FIG. 1) through a communication antenna.

The controller 220 separates the carrier from the signal received through the navigation satellite signal receiver 210 and restores the received IQ data.

The storage unit 230 stores data and programs for the satellite navigation receiver to receive navigation satellite signals and restore IQ data.

4 is a diagram illustrating a terrestrial satellite navigation system according to an embodiment of the present invention.

Referring to FIG. 4 , the satellite navigation system is a system that determines a user's three-dimensional position in real time by triangulation by measuring the arrival time difference between satellite orbit information and a received signal. That is, the satellite navigation system is a system that receives signals from navigation satellites deployed in space and calculates the position of a user terminal on the earth.

In one embodiment, the ground station managing the normal orbit of the navigation satellite may periodically upload accurate actual orbit and time information of the navigation satellite to the satellite, and may disclose the corresponding information.

In one embodiment, satellite information such as a satellite orbit, synchronization time, atmospheric modeling, etc. periodically updated by a ground station is collected through a terrestrial communication network, and a navigation satellite signal may be generated.

In one embodiment, a ground station may transmit satellite orbit information to a cellular base station.

In one embodiment, the server may create virtual navigation satellites below the earth's surface to be symmetrical to the navigation satellites with respect to the ground. Alternatively, the virtual navigation satellites may be virtually deployed indoors of a building.

In one embodiment, a terrestrial satellite navigation (TSN) related server can perform high-precision 3D positioning by minimizing an error in the vertical direction of a position to be measured using navigation satellites and virtual satellites.

According to an embodiment of the present disclosure, the satellite navigation system can be used even in areas where satellite signals do not reach by constructing a navigation signal generation system in a building interior or underground space where satellite signals do not reach.

In addition, according to an embodiment of the present disclosure, it is possible to solve problems such as an insufficient number of satellites in the vertical direction and an error in vertical position due to a narrow orbit, which are limitations of the local satellite navigation system.

In addition, according to an embodiment of the present disclosure, if the ground station that manages the orbit of the navigation satellite shares satellite orbit information, the satellite navigation system can be operated even if there is no actual satellite.

5 is a diagram illustrating a terrestrial satellite navigation system according to an embodiment of the present invention.

Referring to FIG. 5 , the satellite navigation system ground station may transmit navigation satellite information of the ground station to the TSN server. The navigation satellite information may include actual orbit and time information of the navigation satellite. In addition, the ground station may collect satellite information such as a satellite orbit, synchronization time, atmospheric modeling, etc. through a terrestrial communication network, and transmit the collected information to the TSN server.

Accordingly, the TSN server may receive navigation satellite information from the ground station. Alternatively, the TSN server may receive navigation satellite information from the navigation satellite.

In one embodiment, the TSN server may create virtual navigation satellites based on received navigation satellite information. The TSN server can synchronize the virtual navigation satellites to the same time as the communication system. In addition, the TSN server determines the user's 3D location in real time based on at least one of orbit information of a real satellite, arrival time of a signal received from a real satellite, orbit information of a virtual satellite, and arrival time of a signal received from a virtual satellite. can be determined by

In addition, the TSN server may perform a GNSS Generator (GG) or Dead-Reckoning GNSS Generator (DRGG) integrated control procedure. For example, the TSN server may generate a signal according to the movement coordinates of the virtual satellite and determine the position of the object by fusing the signal of the actual navigation satellite with the signal of the virtual satellite.

Also, the TSN server can control and manage the quality of the TSN system. Also, the TSN server may manage stability of the TSN system and security of the TSN system. Furthermore, the TSN server can manage the performance of the TSN side.

In addition, the TSN server determines an object whose location is to be identified, receives orbit information of a navigation satellite, creates a virtual satellite to correspond to the navigation satellite based on the orbit information of the navigation satellite, and generates a virtual satellite to correspond to the navigation satellite. Based on this, signal information of the virtual satellite may be acquired, and the position of the object may be identified based on orbit information of the navigation satellite and signal information of the virtual satellite. In an embodiment, the orbit information of the navigation satellite may include information about an actual orbit of the navigation satellite, synchronization time information of the navigation satellite, and atmospheric information related to the navigation satellite.

6 is a diagram illustrating an actual navigation satellite and a virtual navigation satellite according to an embodiment of the present invention.

Referring to FIG. 6 , the TSN server may create virtual navigation satellites to correspond to actual navigation satellites. Specifically, the TSN server may clone and create virtual navigation satellites to compensate for the disadvantages of the local satellite navigation system. Based on the real navigation satellite and the virtual navigation satellite, the location of the object can be more accurately identified.

As such, the present invention provides IF I/Q satellite navigation signal conversion technology, communication frequency-to-RF conversion technology, frequency utilization technology for each major carrier, navigation satellite IF I/Q recovery technology in communication carriers, 5G/6G base station/repeater It is composed of convergence technology and can transmit navigation satellite signals using only the frequency of a specific carrier.

Various embodiments of the present document are software (including instructions stored in a machine-readable storage media (eg, memory) (internal memory or external memory)) that can be read by a machine (eg, a computer). e.g. program). A device is a device capable of calling a stored command from a storage medium and operating according to the called command, and may include an electronic device according to the disclosed embodiments. When the command is executed by a processor, the processor may perform a function corresponding to the command directly or by using other components under the control of the control unit. An instruction may include code generated or executed by a compiler or interpreter. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' only means that the storage medium does not contain a signal and is tangible, but does not distinguish whether data is stored semi-permanently or temporarily in the storage medium.

According to one embodiment, the method according to various embodiments disclosed in this document may be included and provided in a computer program product.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art can make various substitutions, modifications, and changes within the scope not departing from the essential characteristics of the present invention. You will easily see that this is possible. That is, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments.

Therefore, the protection scope of the present invention should be construed according to the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (6)

A navigation satellite that generates a radio frequency (RF) signal for communication that includes GNSS (Global navigation satellite system) or RNSS (Regional navigation satellite system) I/Q (inphase quadrature-phase) data using a frequency band used in terrestrial communication networks signal generator; and
A navigation satellite signal system using a communication frequency comprising a navigation satellite signal receiver configured to receive the navigation satellite signal generated by the navigation satellite signal generator and restore intermediate frequency (IF) I/Q data of the navigation satellite signal. The method of claim 1, wherein the frequency band used in the terrestrial communication network,
A navigation satellite signal system using a communication frequency, which is a frequency band different from the L band allocated to the satellite navigation system. The method of claim 1, wherein the navigation satellite signal generator,
a receiver for receiving satellite signals from a plurality of navigation satellites;
a satellite navigation information storage unit for storing reference satellite navigation information for a plurality of navigation satellites including the plurality of navigation satellites;
a navigation satellite selecting unit that selects a navigation satellite having a poor reception state based on the received satellite signal;
a satellite navigation information generating unit generating satellite navigation information for the selected navigation satellite based on the reference satellite navigation information for the selected navigation satellite among the reference satellite navigation information; and
A navigation satellite signal system using a communication frequency comprising a communication converter for transmitting a signal containing the generated satellite navigation information on a communication frequency. a memory that stores one or more instructions; and
at least one processor to execute the one or more instructions, the at least one processor comprising:
determine the object whose location you want to identify;
Receive orbital information from navigation satellites;
Based on orbit information of the navigation satellite, creating a virtual satellite to correspond to the navigation satellite;
Obtaining signal information of the virtual satellite based on the virtual satellite;
The terrestrial navigation system server for identifying the location of the object based on the orbit information of the navigation satellite and the signal information of the virtual satellite. The method of claim 4, wherein the orbit information of the navigation satellite,
A terrestrial satellite navigation system server comprising information about an actual orbit of the navigation satellite, synchronization time information of the navigation satellite, and atmospheric information related to the navigation satellite. The method of claim 4, wherein the orbit information of the navigation satellite,
A terrestrial satellite navigation system server that is transmitted and received from at least one of a ground station and the navigation satellite.

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