KR102428516B1 - A system and method for providing radio wave quality at a long distance using radio signals received from an aircraft flying at a short distance - Google Patents

Abstract

The present invention relates to a system and a method for providing a radio wave quality at a long distance by using a radio signal received from an aircraft flying at a short distance. To achieve the purpose, in accordance with one embodiment of the present invention, the system for providing a radio wave quality at a long distance by using a radio signal received from an aircraft flying at a short distance, includes: a radio wave collection device mounted on an aircraft, measuring the quality of a radio signal transmitted from a radio wave analyzer, generating array data based on the measured quality, and transmitting the generated array data to the radio wave analyzer; and the radio wave analyzer receiving the array data from the radio wave collection device, acquiring a radio wave quality at a long distance using the received array data, and outputting the acquired radio wave quality.

Description

A system and method for providing radio wave quality at a long distance using radio signals received from a flying vehicle at a short distance }

The present invention relates to a system and method for providing radio wave quality at a long distance by using a radio signal received from an aircraft flying at a short distance.

The aircraft receives information from the navigation safety facility from take-off to landing, and operates based on the received information. Accordingly, for the safety of the aircraft, it is necessary to periodically inspect the navigation safety facilities so that the navigation safety facilities can operate normally without errors.

Since the radio wave signal transmitted from the navigation safety facility is very important information directly related to the safe operation of the aircraft, it must be managed so that it is transmitted accurately while always checking to prevent deviations from occurring.

To this end, airport operators regularly inspect and correct navigation safety facilities by means of inspection planes, but the quality of radio waves transmitted from navigation safety facilities due to changes in buildings, topographical features, and electrical noise around the airport. There is a limit to quickly identifying and taking action on distortions.

In addition, airport operators monitored, measured, and analyzed radio wave signals transmitted from navigation safety facilities using various equipment, and related personnel improved or resolved the operating environment according to the results. Measuring equipment for analysis of navigational safety facilities, which is currently mainly used, is large and heavy, making it difficult to move and difficult to operate.

The prior art (Korean Patent Publication No. 10-2166683) relates to a method and apparatus for analyzing a navigation facility signal using a drone, and a navigation facility signal analysis using a drone that allows an administrator to easily monitor the navigation facility signal measured by the drone Methods and apparatus are provided.

However, the prior art only acquires navigation facility information including the location of the runway and the location of a signal generator that transmits the navigation facility signal from an external server, and calculates and transmits a flight route based on the obtained information. It does not measure the quality of the radio signal by applying the near position of the airplane and the signal generator to the far distance.

In addition, in the prior art, since only radio wave measurement results in a short distance are provided, the validity of radio wave quality at a long distance in which an actual aircraft operates could not be confirmed.

In addition, there is a limit in checking the normality of the navigation safety facility for various cases of numerous aircraft flying in three-dimensional space in the related art.

Therefore, there is a need to improve the accuracy of navigation safety facilities by measuring the radio wave quality at a long distance even through an aircraft flying in a short distance.

Korean Patent Publication No. 10-2166683

Accordingly, an object of the present invention is to provide a system and method for providing radio wave quality at a long distance by using a radio signal received from an aircraft flying at a short distance.

In addition, the present invention provides a spatial three-dimensional electric field strength, AM/FM modulation index, phase shift, etc. for radio waves transmitted from an antenna of a navigation safety facility (or radio wave analysis device) required for inspection and maintenance of a navigation safety facility. It is possible to provide an observational display device that converts near field radio data into a far field radio system that considers the actual flight distance of the aircraft.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve this object, a system for providing radio wave quality at a long distance using a radio signal received from an air vehicle flying at a short distance according to an embodiment of the present invention is mounted on the air vehicle and transmitted from the radio wave analysis device. a radio wave collecting device for measuring the quality of a signal, generating sequence data based on the measured quality, and transmitting the generated sequence data to the radio wave analysis device; and receiving the sequence data from the radio wave collecting device; , the radio wave analyzer for obtaining radio wave quality at a long distance by using the received sequence data and outputting the obtained radio wave quality.

In addition, in the method of providing radio wave quality at a long distance using a radio signal received from an aircraft flying in a short distance according to an embodiment of the present invention, the radio wave collecting device determines the quality of the radio signal transmitted from the radio wave analysis device. measuring, the radio wave collecting device generating sequence data based on the measured quality, the radio wave collecting device transmitting the generated sequence data to the radio wave analyzing device, the radio wave analyzing device , receiving the sequence data from the radio wave collecting device, the radio wave analyzing device acquiring radio wave quality at a long distance using the received arrangement data, and the radio wave analyzing device receiving the obtained radio wave quality It may include the process of outputting .

The present invention measures the quality of a radio signal transmitted from the radio wave analysis device according to the present invention, generates sequence data based on the measured quality, and transmits the generated sequence data to the radio wave analysis device by transmitting the generated sequence data to the radio wave analysis device. It is possible to improve the accuracy of navigation safety facilities by measuring the radio wave quality in the

In addition, according to the present invention, it is possible to check and correct navigation safety facilities while predicting the quality of radio waves received by the aircraft in the actual route, thereby maintaining a more practical and faithful radio wave transmission environment.

In addition, according to the present invention, the normality of the navigation safety facility can be checked even at a long distance by receiving the sequence data from the radio wave collecting device and acquiring the radio wave quality at a long distance using the received sequence data.

In addition, the present invention observes and compares the radio wave quality measurement result and the long-distance conversion prediction result at a short distance of a navigation safety facility using an air vehicle through a present device to which 3D spatial coordinate modeling is applied, thereby providing an airport operator with more accurate and stable Facility inspection and maintenance can be performed.

In addition, according to the present invention, the radio wave collection device acquires the three-axis geographic coordinates for the current position of the vehicle in real time, and maps the spatial three-dimensional electric field strength, AM/FM index, and phase shift to the obtained three-axis geographic coordinates. , it is possible to measure the radio wave quality according to the real-time location of the vehicle in real time.

In addition, in the present invention, in a state in which the vehicle is flying at a short distance based on the first distance from the radio wave analyzer, the electric field strength measured by the radio wave analyzer for the radio signal corresponds to a second distance greater than the first distance. By converting the radio wave quality to obtain the radio wave quality, it is possible to measure the radio wave quality at a long distance even through an aircraft flying in the short distance, thereby improving the accuracy of the navigation safety facility.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is a block diagram illustrating a system for providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to an embodiment of the present invention.
2 is an exemplary diagram illustrating array data generated by a radio wave collecting device according to an embodiment of the present invention.
3 is a flowchart illustrating a process of providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to an embodiment of the present invention.
4 is an exemplary diagram illustrating a loss according to a distance from an aircraft in the radio wave analysis apparatus according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to refer to the same or similar components.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, the first component may be the second component, of course.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "top (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when it is described that a component is “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components are “interposed” between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected” through another component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Throughout the specification, when referring to “A and/or B”, it means A, B or A and B, unless otherwise stated, and when referring to “C to D”, it is Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

Hereinafter, a system and method for providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to some embodiments of the present invention will be described.

1 is a block diagram illustrating a system for providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to an embodiment of the present invention. 2 is an exemplary diagram illustrating array data generated by a radio wave collecting device according to an embodiment of the present invention.

1 and 2, the system 100 for providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to an embodiment of the present invention is a radio wave collecting device 140 It may include an onboard aircraft 110 , a navigation safety facility 130 , and a radio wave analysis device 150 .

According to an embodiment, the vehicle 110 may include a transportation means 120 and a radio wave collection device 140 .

According to an embodiment, the radio wave collecting device 140 includes a radio wave receiving unit 141, a global positioning system (GPS) receiving unit 142, an image collecting unit 143, a short-range wireless communication unit 144, and a long-distance wireless communication unit ( 145) may be included.

According to an embodiment, the radio wave analysis apparatus 150 may include a display unit 151 , a short-range wireless communication unit 152 , a long-range wireless communication unit 153 , and a processor 154 .

The configuration of the system 100 for providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance shown in FIG. 1 is according to an embodiment, and a radio signal received from an aircraft flying at a short distance The components of the system 100 that provide radio wave quality at a long distance using

According to an embodiment, the aircraft 110 may acquire the navigation facility signal transmitted by the navigation safety facility 130 while flying around the runway to monitor the navigation facility signal transmitted by the navigation safety facility 130 .

For example, the aircraft 110 may be an unmanned aerial vehicle (eg, a drone), and a three-dimensional flight path from the navigation safety facility 130 using the vehicle 110 to the navigation safety facility 130 . , and may automatically fly according to the three-dimensional flight path.

During automatic flight, the vehicle 110 may periodically measure the navigation signal value from the navigation safety facility 130 through the mounted signal processing unit 146 , and for each device included in the navigation safety facility 130 . Different kinds of navigation signal values can be measured.

In addition, the vehicle 110 may periodically acquire GPS data through the mounted GPS module, and acquire a flight image through an image sensor. The vehicle 110 may provide a navigation signal value, GPS data, and a flight image to the navigation safety facility 130 using the vehicle in real time.

According to an embodiment, the navigation safety facility 130 includes, for example, an Instrument Landing System (ILS), a radar, a VHF Omni Range (VOR), and a tactical navigation system. , TACAN), a distance measuring equipment (DME), and at least one of an air traffic control communication facility may be included, and different navigation signal values may be generated for each device.

According to an embodiment, the DME is a system that provides information on the slant distance between the vehicle 110 and ground equipment (eg, the navigation safety facility 130 ) to the vehicle 110 . When the DME mounted on the vehicle 110 transmits a pulse signal to the ground station, the DME ground station receives this signal and transmits a response signal to the vehicle 110 after a predetermined time delay (eg, 50 μs). The time interval between the interrogation pulse and the response pulse is proportional to the inclination distance between the vehicle 110 and the DME ground facility. The DME calculates the distance by measuring the round-trip time of the pulse signal.

For example, if the DME frequency is transmitted at 1,025 to 1,150 MHz from the aircraft 110, the ground station responds with 960 to 1,215 MHz after 50 μsec, and the maximum operating distance is 400 NM (about: 725 km).

The interrogation pulse transmitted by the aircraft 110 is a pulse pair consisting of two pulses configured in a predetermined random pattern form within a certain period. Sending two pulses (3μsec width, 12μsec interval) is to prevent loss due to interference or noise. The ground station receiving this (eg, navigation safety facility 130) responds with a different frequency after 50 μsec time.

According to an embodiment, the VOR provides azimuth information based on a ground transmission station (eg, navigation safety facility 130) to the vehicle 110 to support the vehicle 110 to fly in a predetermined route. is a facility VOR was adopted by the ICAO in 1949 as the standard for non-precision approach support facilities. It provides a wide range of radio signals up to an altitude of 60,000 ft (about: 18 km) and a distance of 130 NM (about: 240 km).

The principle of VOR is based on the phase relationship between two 30 Hz signals, that is, a reference phase signal and a variable phase signal. The reference phase signal is radiated omni-directionally as a 30Hz sine wave, and the phase of the reference signal is obtained the same regardless of which direction the vehicle 110 is in. The variable phase signal is radiated by rotating a 30Hz sine wave at a rate of 30 times per second. With the phase difference of 0° at 0° magnetic north as the reference point, the phase difference is changed by 360° according to the azimuth, and the phase difference obtained varies according to the position of the airplane.

The navigation safety facility 130 obtains an azimuth from the phase difference between these two signals and displays it on a bearing indicator. The frequency used by VOR is the very high frequency (VHF) band of 108 to 118 MHz.

In addition, the VOR signal includes a unique code for identification of the VOR transmitting station in addition to the above-mentioned two signals, and may optionally include a voice signal. The identification code consists of two or three different alphabets or numbers for each VOR transmitting station, and a 1020Hz sine wave signal amplitude-modulated on a carrier is transmitted as a Morse code corresponding to the allocated identification code. The voice signal is transmitted as voice in the 300Hz ~ 3,000Hz band amplitude-modulated on the carrier wave or used for airport information broadcasting.

According to an embodiment, the ILS includes a ground azimuth facility (LLZ) that provides left and right azimuth information of the runway centerline, a glide path (GP) that provides vertical and elevation glide angle information, and a step-by-step distance of a runway touchdown point. It consists of a Marker Beacon (MB) that provides information.

According to an embodiment, the LLZ emits radio waves so that a beam can be transmitted from an altitude of 2,000 ft to a minimum of 25 NM (about: 45,312 km). The width in the direction of travel is usually 3~6°, 700ft (about: 210km) from the end of the runway, and the frequency range is 108.10~111.975MHz. In the instrument of the vehicle 110, the LLZ indicator moves left and right due to the difference in the strength and weakness of the electric field according to the modulation component of the left and right frequencies (90 Hz, 150 Hz) from the ground transmitter, so the pilot can position the vehicle 110 in the center of the runway. .

In addition, the right antenna of the LLZ transmits a positive phase 150 Hz signal and an antiphase 90 Hz signal, and the left antenna transmits a positive phase 90 Hz signal and an antiphase 150 Hz signal, on the contrary. When signals of different phases on the left and right are synthesized, null (no signal or zero) is created on the center line of the runway. Therefore, when the intensity of the received signal of the LLZ receiver of the vehicle 110 becomes 0, it can be determined that the vehicle is located at the center line of the runway.

According to one embodiment, the GP transmitter emits radio waves to provide glide angle information of about 3°, which is a safe landing angle, to the approaching vehicle 110 to land on the runway, and 750 to 1,250 ft from the runway approach end, the runway. They are installed 400 to 600 feet away from the center line. It provides radio signals up to an altitude of 4,500 ft (1.4 km) and a distance of 10 NM (18 km).

And, the GP frequency range is 328.6MHz~335.4MHz, and it is set to the automatically assigned frequency when the LLZ frequency is selected. The frequency emitted from the GP transmitter also emits a directional wave modulated at 150 Hz and 90 Hz on the lower side of the drop path, and the receiver of the aircraft 110 causes the GP indicator to move up and down due to the difference in the strength and weakness of the electric field according to the two modulation components. It informs the appropriate glide angle so that the aircraft 110 can land safely

According to one embodiment, MB is a facility that informs the distance where the aircraft 110 is located from the slide, and emits an inverted cone-shaped 75 MHz directional radio wave toward the sky. According to the distance, it is divided into outer marker (4~7NM, 400Hz), middle marker (3,500ft, 1,300Hz), and inner marker (200~1,500ft, 3,000Hz).

According to one embodiment, the transportation means 120 of the vehicle 110 may directly control the vehicle 110, but the vehicle 110 is a three-dimensional flight path provided by the navigation safety facility 130 using the vehicle. Accordingly, in the case of automatic flight, control of the vehicle 110 may be limited.

According to an embodiment, in the transportation means 120 , the navigation safety facility 130 is determined to be abnormal by the navigation safety facility 130 using the aircraft 110 , or the inspection of the navigation safety facility 130 is performed. When completed, by directly controlling the aircraft 110, it is possible to adjust a flight path, a landing point, a landing time, and the like.

According to an embodiment, the radio wave receiver 141 of the aircraft 110 may receive a radio wave transmitted from the navigation safety facility 130 or the radio wave analysis device 150 . The radio wave receiving unit 141 is a navigation safety facility 130 or a radio wave analysis device ( 150) of various types of information can be received.

According to an embodiment, the GPS receiver 142 of the vehicle 110 may receive a geographic coordinate signal from a GPS satellite.

According to an embodiment, the image collection unit 143 of the aircraft 110 may acquire ground surface image data.

According to an embodiment, the short-range wireless communication unit 144 of the vehicle 110 may transmit a signal or data to the radio wave analysis device 150 .

According to an embodiment, the remote wireless communication unit 145 of the aircraft 110 may transmit data by accessing a mobile communication network such as 5G (5 generation).

According to an embodiment, the signal processing unit 146 of the aircraft 110 may receive a signal propagated from the navigation safety facility 130 or the radio wave analysis device 150 .

For example, when the radio signal is a signal related to an Instrument Landing System (ILS), the signal processing unit 146 may be configured to perform 90 Hz to 150 Hz AM index, DDM, based on the signal related to the instrument landing system. (Difference in Depth of Modulation), SDM (Sum in Depth of Modulation), CDI (Course Deviation Indicator), and frequency may be analyzed.

For example, if the signal is a signal related to an omni-directional beacon (VHF Omni Range, VOR), the signal processing unit 146 may include a 30 Hz AM index, a 30 Hz FM index, a received power, and a sine/cosine (Sine/cosine) signal. Cosine) signal phase shift, and frequency can be analyzed.

For example, when the radio signal is a signal related to a tactical navigation device (TACAN) or a distance measuring equipment (DME), the signal processing unit 146 is 15Hz to 135Hz AM index, pulse width , the number of squiters, bearings, bearing errors, received power and frequency can be analyzed.

In this way, the signal processing unit 146 may analyze and process a signal received from the navigation safety facility 130 or the radio wave analysis device 150 .

According to an embodiment, the signal processing unit 146 may measure the quality of the radio wave signal transmitted from the radio wave analysis apparatus 150 . For example, the signal processing unit 146 analyzes the radio signal transmitted from the radio wave analysis device 150 to measure a spatial three-dimensional electric field strength, an AM/FM (Amplitude Modulation/Frequency Modulation) index, and a phase shift or can be analyzed. And, the signal processing unit 146 is

According to an embodiment, when the signal processing unit 146 receives the radio signal, it obtains in real time three-axis geographic coordinates for the current position of the vehicle 110, and the spatial three-dimensional electric field strength, the AM/ The FM index and the phase shift may be mapped to the obtained three-axis geographic coordinates based on the current position of the vehicle 110 .

According to an embodiment, the signal processing unit 146 may acquire image data for the operation of the aircraft 110 through the image collection unit 143 .

According to an embodiment, the signal processing unit 146 may generate sequence data based on the measured quality. The signal processing unit 146 generates array data including the mapped three-axis geographic coordinates, the image data, and a radio wave quality measurement value composed of the spatial three-dimensional electric field strength, the AM/FM index, and the phase shift. can

Referring to FIG. 2 , the array data 210 includes a time stamp 211 indicating the time when the array data is generated, a latitude and longitude/elevation three-axis geographic coordinate 212 , and a radio wave quality measurement value 213 . , and image data 214 .

The signal processing unit 146 may measure the quality of the radio signal received from the radio wave analysis device 150 or the navigation safety facility 130 . For example, in the signal processing unit 146, the latitude/longitude/elevation three-axis geographic coordinates 212 are three-dimensional electric field strength, AM/ Measure the data for the FM index, and the phase shift.

In addition, the signal processing unit 146 is the latitude/longitude/elevation three-axis geographic coordinates 212, the three-dimensional electric field strength, AM/FM index, and the phase shift are the distance between the aircraft 110 and the radio wave analysis device 150 ( Alternatively, it is mapped to the array data 210 based on the current location of the vehicle 110 ).

When a radio signal is received from the radio wave analysis device 150 or the navigation safety facility 130, the signal processing unit 146 is the distance between the vehicle 110 and the radio wave analysis device 150 (or the current of the vehicle 110). position) in real time, and based on the distance between the vehicle 110 and the radio wave analysis device 150 (or the current position of the vehicle 110), three-dimensional electric field strength, AM / FM index, and phase shift can be calculated Then, each calculated value is recorded in the latitude/longitude/elevation 3-axis geographic coordinates of the array data 210 .

In the image data 214 of the array data 210 , image data acquired through the image collecting unit 143 is recorded.

According to an embodiment, the radio wave collection device 140 may transmit the array data 210 generated through the short-range wireless communication unit 144 to the radio wave analysis device 150 . For example, the short distance may be within a few hundred meters, and the far distance may be in the range of several tens of kilometers (eg, 40 km to 60 km).

According to an embodiment, the radio wave analysis apparatus 150 may include a display unit 151 , a short-range wireless communication unit 152 , a long-range wireless communication unit 153 , and a processor 154 .

According to an embodiment, the short-range wireless communication unit 152 may receive a signal transmitted from the radio wave collection device 140 (eg, the short-range wireless communication unit 144). The signal reception range of the short-range wireless communication unit 152 may be within several hundred meters. The short-range wireless communication unit 152 may receive a signal transmitted from the radio wave collection device 140 (eg, the short-range wireless communication unit 144 ), and then transmit the received signal to the processor 154 .

According to an embodiment, the remote wireless communication unit 153 may receive a signal transmitted through a 5G mobile communication network. The signal reception range of the remote wireless communication unit 153 may be a range of several tens of kilometers (eg, 40 km to 60 km). The remote wireless communication unit 153 may transmit the received signal to the processor 154 .

According to an embodiment, the display unit 151 may display various information related to the navigation of the aircraft 110 . The display unit 151 may display array data generated by the radio wave collection device 140 under the control of the processor 154 . In addition, the display unit 151 displays information on the signal quality in a short distance measured by the radio wave collecting device 140 under the control of the processor 154 and the radio wave quality when the signal quality in the short distance is applied at a long distance. can

According to an embodiment, the processor 154 may drive software to control at least one component connected to the processor 154 based on wired communication or wireless communication. In addition, the processor 154 may perform various data processing and operations based on the wired communication or the wireless communication.

According to an embodiment, the processor 154 stores commands or data received from the short-range wireless communication unit 152, the long-distance wireless communication unit 153, the memory (not shown), and the display unit 151 to the memory (not shown). ) can be loaded and processed, and the processed data can be stored in a memory (not shown). Alternatively, the processor 154 may display the processed data through the display unit 151 .

According to an embodiment, the processor 154 may estimate (or acquire) the radio wave quality when the distance to the aircraft 110 is long by using the array data received from the radio wave collection device 140 . have.

For example, when the distance between the radio wave collection device 140 and the flying vehicle 110 is a short distance (eg, within several hundred meters), the radio wave collection device 140 has a long distance ( For example, in order to determine what the radio wave quality is at a distance of 40 km to 60 km), it is possible to estimate (or obtain) radio wave quality at a long distance based on the sequence data 210 .

According to an embodiment, the processor 154 analyzes the radio waves in a state in which the vehicle 110 is flying at a short distance based on the radio wave analysis device 150 and a first distance (eg, within several hundred meters). The radio wave collected by the radio wave collecting device so that the electric field strength measured for the radio signal transmitted by the device 150 corresponds to the first distance (e.g., a second distance (e.g., 40 km to 60 km) that is farther than within several hundred meters) By transforming the quality measurement value, the propagation quality based on the second distance may be obtained.

For example, the radio wave collection device 140 measures the radio wave quality based on the distance between the air vehicle 110 and the radio wave analysis device 150 and the current position of the air vehicle 110 , and then the measured radio wave quality , when the array data 210 mapped to the current position of the vehicle 110 is transmitted to the radio wave analysis device 150, the radio wave analysis device 150 applies the received radio wave quality value as the second distance, and the second Propagation quality based on distance can be obtained.

For example, the processor 154 may convert the electric field strength with respect to the first distance to correspond to the second distance using Equation 1 below.

In <Equation 1>, P _t represents the transmission power of the radio signal, r ₁ represents the distance between the radio wave collection device and the radio wave analyzer, and r ₂ represents the radio wave collecting device and the represents the direct distance between the radio wave analyzers, λ represents the wavelength of the signal, Γ(α) represents the complex reflection coefficient as a function of the angle of incidence (α) and the complex permittivity of the ground, and θ for each vertical or horizontal polarization is 90-α, q is 1 or (e _r ) ⁻¹ , and e _r represents the complex state permittivity.

According to an embodiment, the processor 154 may obtain an AM/FM index and a phase shift proportional to the electric field strength.

In addition, the processor 154 may output the obtained radio wave quality through the display unit 151 . The processor 154 may display a screen including the quality of the radio signal at the first distance and the radio quality converted based on the second distance through the display unit 151 .

For example, the screen may include radio wave quality converted in real time based on the distance between the aircraft 110 and the radio wave analysis device 150 .

3 is a flowchart illustrating a process of providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to an embodiment of the present invention. 4 is an exemplary diagram illustrating a loss according to a distance from an aircraft in the radio wave analysis apparatus according to an embodiment of the present invention.

Hereinafter, with reference to FIGS. 3 and 4, a process of providing radio wave quality at a long distance using a radio signal received from an aircraft flying at a short distance according to an embodiment of the present invention will be described in detail as follows.

According to an embodiment, the radio wave collecting apparatus 140 may measure the quality of the radio signal transmitted from the radio wave analyzing apparatus 150 ( S310 ). The distance between the aircraft 110 and the radio wave analysis device 150 is maintained in a short distance (eg, within several hundred meters), and the radio wave collection device 140 receives the radio signal transmitted by the radio wave analysis device 150 by the radio wave receiving unit 141 . can be received through Thereafter, the radio wave receiving unit 141 may transmit a signal transmitted by the radio wave analyzing apparatus 150 (eg, the short-range wireless communication unit 152 ) to the signal processing unit 146 .

According to an embodiment, the radio wave collection device 140 may acquire image data for the operation of the aircraft 110 in real time (S312). The radio wave collection device 140 (eg, the image collection unit 143 ) may acquire image data (eg, image data on the ground) according to the operation of the aircraft 110 in real time. For example, the radio wave collecting device 140 (eg, the image collecting unit 143 ) transmits image data about the radio wave analysis device 150 (or the navigation safety facility 130 ) in real time while the aircraft 110 is in flight. can be obtained with Through this, the signal processing unit 146 may estimate the distance between the aircraft 110 and the radio wave analysis device 150 .

According to an embodiment, the radio wave collection device 140 may acquire in real time three-axis geographic information for latitude/longitude and altitude of the aircraft 110 ( S314 ). The radio wave collection device 140 may acquire in real time three-axis geographic information (eg, the current location of the vehicle 110) for latitude, longitude, and altitude of the vehicle 110 while the vehicle 110 is in operation. . In addition, the radio wave collection device 140 may measure in real time a distance (eg, a direct distance or a distance through reflection of the ground) between the aircraft 110 and the radio wave analysis device 150 while the aircraft 110 is in operation.

According to an embodiment, the radio wave collecting apparatus 140 may generate the arrangement data by mapping the measured quality of radio signals and the obtained image data to triaxial geographic information ( S316 ). The radio wave collecting apparatus 140 may generate sequence data including the quality, image data, and 3-axis geographic information obtained in the above steps S310, S312, and S314, respectively. For example, the constellation data includes the acquired quality and image data, and also, when the vehicle 110 is in operation, three-axis geographic information (eg, the vehicle ( 110) of the three-axis geographic coordinates reflecting the current location) may be included.

According to an embodiment, the radio wave collecting device 140 may transmit the generated array data to the radio wave analyzing device 150 ( S318 ). The radio wave collecting device 140 propagates through the short-range wireless communication unit 144 the array data in which the acquired quality, image data, and three-axis geographic information (eg, three-axis geographic coordinates reflecting the current position of the aircraft 110) are reflected. may be transmitted to the analysis device 150 .

According to an embodiment, the radio wave analysis apparatus 150 may measure radio wave quality using the array data ( S320 ). The radio wave analyzer 150 is a state in which the vehicle 110 is flying at a short distance based on the radio wave analyzer 150 and the first distance (eg, within several hundred meters), the electric field strength measured for the radio signal is said It may be converted to correspond to a second distance (eg, 50 km) that is greater than the first distance (eg, within several hundred meters), and radio wave quality may be obtained based on the converted electric field strength. For example, the radio wave analysis device 150 receives the arrangement data in units of a predetermined time (eg, 3 seconds) from the radio wave collection device 140, and then according to the distance of the aircraft 110 through the received arrangement data. The electric field strength may be calculated, and a radio wave quality may be obtained based on the calculated electric field strength.

Also, the radio wave analyzer 150 may obtain an AM/FM index and a phase shift based on the electric field strength.

According to an embodiment, the radio wave analysis apparatus 150 may convert the array data into long-distance analysis data by using the array data (S322). In a state in which the vehicle 110 is flying at a short distance based on the first distance (eg, within several hundred meters) with the radio wave analysis device 150 , the electric field strength measured for the radio signal is measured at the first distance (eg, within several hundred meters). : It can be converted to correspond to a second distance (eg, 50 km) that is greater than a few hundred meters).

Referring to FIG. 4 , the radio wave analyzer 150 shows the electric field strength according to the distance of the aircraft 110 through a graph 411 showing the electric field strength of the signal according to the distance between the aircraft 110 and the radio wave analyzer 150 . can be calculated. Although FIG. 4 shows the electric field strength for 20 km, this is only an example, and the radio wave analyzer 150 may calculate the electric field strength for 50 km. And, this graph 411 can be calculated through <Equation 1>.

According to an embodiment, the radio wave analysis apparatus 150 may display the measured radio wave quality and the converted distance analysis data (S324). The radio wave analysis apparatus 150 may display a screen including the radio signal quality at the first distance and the radio wave quality converted based on the second distance through the display unit 151 .

For example, the screen may include radio wave quality converted in real time based on the distance between the aircraft 110 and the radio wave analysis device 150 .

As described above, the radio wave analysis apparatus 150 according to an embodiment of the present invention estimates or calculates the radio wave quality according to flying at a long distance, even when the vehicle 110 flies within a short distance to measure the radio wave quality. By doing so, airport operators can perform more accurate and stable facility inspection and maintenance.

Each step in each of the above-described flowcharts may be operated regardless of the illustrated order, or may be performed simultaneously. In addition, at least one component of the present invention and at least one operation performed by the at least one component may be implemented in hardware and/or software.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

110: vehicle 120: means of transport
130: navigation safety facility 140: radio wave collection device
150: radio wave analysis device 151: display unit
152: short-range wireless communication unit 153: long-distance wireless communication unit
154: processor

Claims (10)

In the system for providing radio wave quality at a long distance by using a radio signal received from an aircraft flying in a short distance,
A radio wave collecting device mounted on the aircraft, measuring the quality of a radio signal transmitted from the radio wave analysis device, generating sequence data based on the measured quality, and transmitting the generated sequence data to the radio wave analysis device ; and
and the radio wave analysis device receiving the sequence data from the radio wave collection device, acquiring a radio wave quality at a long distance by using the received sequence data, and outputting the obtained radio wave quality,
When the radio signal is a signal related to an Instrument Landing System (ILS), the radio wave collection device is based on the signal related to the instrument landing system, 90Hz to 150Hz AM index, DDM (Difference in Depth of Modulation) , SDM (Sum in Depth of Modulation), CDI (Course Deviation Indicator), and frequency analysis,
If the radio signal is a signal related to a VHF Omni Range (VOR), the radio wave collection device may have a 30 Hz AM index, a 30 Hz FM index, a received power, a Sine/Cosine signal phase shift, and analyze the frequency,
When the radio signal is a signal related to a Tactical Navigation (TACAN) or a Distance Measuring Equipment (DME), the radio wave collecting device has an AM index of 15Hz to 135Hz, a pulse width, and a number of squiters. , a system that analyzes bearings, bearing errors, received power and frequency.
The method of claim 1,
The measured quality includes a spatial three-dimensional electric field strength, an Amplitude Modulation/Frequency Modulation (AM/FM) index, and a phase shift of the radio signal transmitted from the radio wave analysis device.
3. The method of claim 2,
The radio wave collection device,
Acquire the 3-axis geographic coordinates of the current location of the vehicle receiving the radio signal in real time,
A system for mapping the spatial three-dimensional electric field strength, the AM/FM index, and the phase shift to the obtained three-axis geographic coordinates.
4. The method of claim 3,
The radio wave collection device,
A system for acquiring image data on the operation of the aircraft in real time.
5. The method of claim 4,
The radio wave collection device,
a system for generating the array data including the mapped three-axis geographic coordinates, the image data, and a propagation quality measurement consisting of the spatial three-dimensional electric field strength, the AM/FM index, and the phase shift.
The method of claim 1,
The radio wave analysis device,
In a state in which the vehicle is flying at a short distance based on the first distance from the radio wave analysis device, the electric field strength measured for the radio signal is converted to correspond to a second distance greater than the first distance to obtain the radio wave quality and
The system of claim 1, wherein the first distance is within several hundred meters and the second distance is 50 km.
7. The method of claim 6,
The radio wave analysis device,
Converting the electric field strength for the first distance to correspond to the second distance using Equation 1 below,
<Equation 1>

In <Equation 1>, P _t represents the transmission power of the radio signal, r ₁ represents the distance between the radio wave collection device and the radio wave analyzer, and r ₂ represents the radio wave collecting device and the represents the direct distance between the radio wave analyzers, λ represents the wavelength of the signal, Γ(α) represents the complex reflection coefficient as a function of the angle of incidence (α) and the complex permittivity of the ground, and θ for each vertical or horizontal polarization is 90-α, q is 1 or (e _r ) ^-1 , and e _r represents the complex state permittivity.
7. The method of claim 6,
The radio wave analysis device,
A system for displaying the quality of the propagation signal at the first distance and the radio wave quality converted based on the second distance through a display unit.
delete In the method of providing radio wave quality at a long distance using a radio signal received from an aircraft flying in a short distance,
measuring, by the radio wave collecting device, the quality of the radio signal transmitted from the radio wave analyzing device;
generating, by the radio wave collecting device, sequence data based on the measured quality;
transmitting, by the radio wave collecting device, the generated sequence data to the radio wave analyzing device;
receiving, by the radio wave analysis device, the sequence data from the radio wave collecting device;
obtaining, by the radio wave analysis device, radio wave quality at a long distance using the received sequence data; and
and outputting, by the radio wave analysis device, the obtained radio wave quality,
The method is
When the radio signal is a signal related to an Instrument Landing System (ILS), the radio wave collection device is based on the signal related to the instrument landing system, 90Hz to 150Hz AM index, DDM (Difference in Depth of Modulation) , SDM (Sum in Depth of Modulation), CDI (Course Deviation Indicator), and the process of analyzing the frequency;
If the radio signal is a signal related to a VHF Omni Range (VOR), the radio wave collection device may have a 30 Hz AM index, a 30 Hz FM index, a received power, a Sine/Cosine signal phase shift, and the process of analyzing frequencies; and
When the radio signal is a signal related to a Tactical Navigation (TACAN) or a Distance Measuring Equipment (DME), the radio wave collecting device has an AM index of 15Hz to 135Hz, a pulse width, and a number of squiters. , bearing (Bearing), bearing error (Bearing Error), a method including the process of analyzing the received power and frequency.

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