Abnormal propagation information output device, abnormal propagation information output method, and abnormal propagation information output program

Abstract

To output information about the occurrence of abnormal propagation.SOLUTION: An abnormal propagation information output device acquires transmission location information contained in a signal received by receiving means that receives the signal including the transmission location information indicating a transmission location, which is the location of a source that transmits the signal, acquires reception location information indicating a reception location, which is the location of the receiving means, calculates a two-point distance, which is the distance between the transmission location and the reception location, based on the transmission location information and the reception location information, generates and outputs abnormal propagation information, which is information about the occurrence of abnormal propagation of radio waves, and in generating the abnormal propagation information, if the value of the two-point distance is greater than a predetermined specified value, generates the abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmission location and the reception location.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an abnormality propagation information output device, an abnormality propagation information output method, and an abnormality propagation information output program. [Background technology]

[0002] Due to weather conditions, etc., radio waves transmitted from a transmitting device may be received at a point farther than normal. This phenomenon of radio waves being received at a point farther than normal is called anomalous radio wave propagation. Hereinafter, anomalous radio wave propagation may be simply referred to as anomalous propagation.

[0003] Anomalous propagation can occur, for example, due to radio ducts or sporadic E layers occurring in the atmosphere.

[0004] The Japan Meteorological Agency publishes on its website numerical weather forecast data calculated using the NWP (Numerical Weather Prediction) model, as well as real-time weather data. The National Institute of Information and Communications Technology also publishes information on the status of sporadic E layers. Patent Document 1 also describes sporadic E layers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2020-536458 Summary of the Invention [Problem to be solved by the invention]

[0006] When abnormal propagation occurs, radio waves may travel longer distances than expected, which may result in radio interference, such as noise on the radio or degradation of communication quality due to interference.

[0007] Furthermore, if a signal is transmitted while abnormal propagation is occurring, the signal may travel a greater distance than expected, potentially allowing it to be intercepted by someone who does not want it to be intercepted, or allowing someone who does not want the location of the signal source to know the location of the source.

[0008] Furthermore, as mentioned above, the Japan Meteorological Agency and the National Institute of Information and Communications Technology (NICT) publish information such as meteorological data, but the published information does not include information on whether or not abnormal propagation is occurring.

[0009] In view of the above-mentioned problems, the object of the present disclosure is to provide an abnormal propagation information output device, an abnormal propagation information output method, and an abnormal propagation information output program that enable the output of information regarding the occurrence of abnormal propagation. [Means for solving the problem]

[0010] In one aspect of the present disclosure, an abnormal propagation information output device includes a transmission location acquisition unit that acquires transmission location information included in a signal received by a receiving means that receives a signal including transmission location information indicating the transmission location, which is the location of a source that transmits a signal; a receiving location acquisition unit that acquires reception location information indicating the reception location, which is the location of the receiving means; a calculation unit that calculates a two-point distance, which is the distance between the transmission location and the reception location, based on the transmission location information and the reception location information; and an output unit that generates and outputs abnormal propagation information, which is information regarding the occurrence of abnormal propagation of radio waves, and when the value of the two-point distance is greater than a predetermined specified value, the output unit generates the abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmission location and the reception location.

[0011] In another aspect of the present disclosure, an abnormal propagation information output method acquires transmission location information included in a signal received by a receiving means that receives a signal including transmission location information indicating a transmission location, which is the location of a source that transmits a signal, acquires reception location information indicating a reception location, which is the location of the receiving means, calculates a point-to-point distance, which is the distance between the transmission location and the reception location, based on the transmission location information and the reception location information, generates and outputs abnormal propagation information, which is information regarding the occurrence of abnormal propagation of radio waves, and generates the abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmission location and the reception location if the value of the point-to-point distance is greater than a predetermined specified value in generating the abnormal propagation information.

[0012] In another aspect of the present disclosure, an abnormal propagation information output program causes a computer to realize a transmission location acquisition function that acquires transmission location information contained in a signal received by a receiving means that receives a signal including transmission location information indicating the transmission location, which is the location of the source that transmits the signal; a receiving location acquisition function that acquires reception location information indicating the reception location, which is the location of the receiving means; a calculation function that calculates a point-to-point distance, which is the distance between the transmission location and the reception location, based on the transmission location information and the reception location information; and an output function that generates and outputs abnormal propagation information, which is information regarding the occurrence of abnormal radio wave propagation, and the output function generates the abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmission location and the reception location when the value of the point-to-point distance is greater than a predetermined specified value. [Effects of the Invention]

[0013] According to the present disclosure, it becomes possible to output information regarding the occurrence of anomalous propagation. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram illustrating a configuration example of an abnormality propagation information output device according to the present disclosure. [Figure 2] FIG. 10 is a diagram illustrating an example of an operation flow of the anomaly propagation information output device of the present disclosure. [Figure 3] 1 is a diagram illustrating a configuration example of an anomaly propagation information output system according to the present disclosure. [Figure 4] 1 is a diagram illustrating a configuration example of an anomaly propagation information output system according to the present disclosure. [Figure 5] 1 is a diagram illustrating a configuration example of an anomaly propagation information output system according to the present disclosure. [Figure 6] 1 is a diagram illustrating a configuration example of an anomaly propagation information output system according to the present disclosure. [Figure 7] 1 is a diagram illustrating a configuration example of an abnormality propagation information output device according to the present disclosure. [Figure 8] FIG. 10 is a diagram illustrating an example of an anomalous propagation image of the present disclosure. [Figure 9] FIG. 10 is a diagram illustrating an example of an anomalous propagation image of the present disclosure. [Figure 10] FIG. 10 is a diagram illustrating an example of an operation flow of a receiving means of the present disclosure. [Figure 11] FIG. 10 is a diagram illustrating an example of an operation flow of the anomaly propagation information output device of the present disclosure. [Figure 12] FIG. 1 is a diagram illustrating an example of a hardware configuration according to each embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] [First embodiment] A first embodiment of the present disclosure will be described.

[0016] A specific example of the anomaly propagation information output device 10 in the first embodiment is an anomaly propagation information output device 20 in the second embodiment, which will be described later.

[0017] First, an example of the configuration of an anomaly propagation information output device 10 will be described using Fig. 1. Fig. 1 is a diagram showing an example of the configuration of an anomaly propagation information output device 10. The anomaly propagation information output device 10 includes a transmission position acquisition unit 11, a reception position acquisition unit 12, a calculation unit 13, and an output unit 14.

[0018] The transmission location acquisition unit 11 acquires transmission location information contained in a signal received by the receiving means. The receiving means receives a signal containing transmission location information. The transmission location information is information indicating the transmission location. The transmission location is the location of the source that transmits the signal.

[0019] The receiving position acquisition unit 12 acquires receiving position information. The receiving position information is information indicating the receiving position. The receiving position is the position of the receiving means.

[0020] The calculation unit 13 calculates the point-to-point distance based on the transmitting position information and the receiving position information. The point-to-point distance is the distance between the transmitting position and the receiving position.

[0021] The output unit 14 generates and outputs anomalous propagation information. The anomalous propagation information is information relating to the occurrence of anomalous propagation of radio waves. When the value of the point-to-point distance is greater than a predetermined specified value, the output unit 14 generates anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position.

[0022] Next, we will explain an example of the operation flow of the anomaly propagation information output device 10. An example of the operation flow of the anomaly propagation information output device 10 is shown in FIG.

[0023] The origination position acquisition unit 11 acquires the origination position information contained in the signal received by the receiving means (step S101).

[0024] The receiving position acquisition unit 12 acquires the receiving position information (step S102).

[0025] The calculation unit 13 calculates the distance between the two points based on the originating position information and the receiving position information (step S103).

[0026] The output unit 14 generates and outputs anomalous propagation information. When the value of the point-to-point distance is greater than a predetermined specified value, the output unit 14 generates anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position (step S104).

[0027] As described above, in the first embodiment of the present disclosure, the anomalous propagation information output device 10 includes a transmission location acquisition unit 11, a reception location acquisition unit 12, a calculation unit 13, and an output unit 14. The transmission location acquisition unit 11 acquires transmission location information contained in a signal received by a receiving means. The receiving means receives a signal including the transmission location information. The transmission location information is information indicating the transmission location. The transmission location is the location of the source that transmits the signal. The reception location acquisition unit 12 acquires the reception location information. The reception location information is information indicating the reception location. The reception location is the location of the receiving means. The calculation unit 13 calculates the point-to-point distance based on the transmission location information and the reception location information. The point-to-point distance is the distance between the transmission location and the reception location. The output unit 14 generates and outputs anomalous propagation information. The anomalous propagation information is information regarding the occurrence of anomalous propagation of radio waves. When the value of the point-to-point distance is greater than a predetermined specified value, the output unit 14 generates abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmitting position and the receiving position.

[0028] As a result, the anomalous propagation information output device 10 can detect the possibility of anomalous propagation occurring by detecting that a signal that has propagated a distance greater than a specified value has reached the receiving means.The anomalous propagation information output device 10 can then output anomalous propagation information including information indicating the possibility of anomalous propagation occurring.This makes it possible to output information regarding the occurrence of anomalous propagation.

[0029] [Second embodiment] Next, an anomaly propagation information output device 20 according to a second embodiment of the present disclosure will be described. Note that a specific example of the anomaly propagation information output device 10 according to the first embodiment is the anomaly propagation information output device 20 according to the second embodiment.

[0030] 3 shows an example of the configuration of an abnormality propagation information output system 40. The abnormality propagation information output system 40 includes an abnormality propagation information output device 20 and a receiving means 30.

[0031] The receiving means 30 receives a signal. The signal received by the receiving means 30 is a wireless signal. The number of receiving means 30 included in the abnormal propagation information output system 40 may be one, or two or more.

[0032] The anomalous propagation information output device 20 outputs anomalous propagation information, which is information relating to the occurrence of anomalous propagation of radio waves.

[0033] 4 shows another example of the configuration of the abnormal propagation information output system 40. The abnormal propagation information output system 40 may be mounted on a moving body 50, as shown in FIG. 4. The moving body 50 is, for example, a ship, an aircraft, or the like.

[0034] 5 shows another example of the configuration of the abnormal propagation information output system 40. As shown in FIG. 5, a mobile object 51 may include a transmitting means 60. The transmitting means 60 transmits a signal. The signal transmitted by the transmitting means 60 is a wireless signal.

[0035] 6 shows another example of the configuration of an anomaly propagation information output system. In the anomaly propagation information output system 41 shown in FIG. 6, a mobile object 52-i (i is an integer from 1 to N) includes a receiving means 30-i and a transmitting means 60-i. An anomaly propagation information output device 20 is located outside the mobile object 52-i. The transmitting means 60-i transmits information to the anomaly propagation information output device 20 by wireless communication.

[0036] 4 to 6 show examples in which the receiving means is mounted on a mobile body, but the receiving means does not have to be mounted on a mobile body. For example, the receiving means may be installed in a fixed location. Similarly, the transmitting means does not have to be mounted on a mobile body, but may be installed in a fixed location.

[0037] Next, an example of the configuration of the anomalous propagation information output device 20 will be described with reference to Fig. 7. Fig. 7 is a diagram showing an example of the configuration of the anomalous propagation information output device 20. The anomalous propagation information output device 20 includes a transmission position acquisition unit 21, a reception position acquisition unit 22, a calculation unit 23, and an output unit 24. Note that, here, the description will be given taking as an example a case where the anomalous propagation information output device 20 is mounted on a mobile object 50, as shown in Fig. 4.

[0038] The transmission location acquisition unit 21 acquires transmission location information contained in the signal received by the receiving means 30. The receiving means 30 receives the signal containing the transmission location information. The transmission location information is information indicating the transmission location. The transmission location is the location of the source that transmits the signal. Note that the signal containing the transmission location information may hereinafter be referred to as a location signal.

[0039] The position signal may be, for example, a signal from an Automatic Identification System (AIS). The AIS is mainly installed on ships and transmits a signal including information indicating the ship's position. A signal from an AIS will hereinafter be referred to as an AIS signal.

[0040] The position signal may also be an ADS-B (Automatic Dependent Surveillance Broadcast) signal. An ADS-B signal is transmitted from an aircraft and includes information indicating the aircraft's position. An ADS-B signal will hereinafter be referred to as an ADS-B signal.

[0041] The position signal is not limited to an AIS signal or an ADS-B signal. The receiving means 30 receives the position signal. The receiving means 30 may be capable of receiving at least one of an AIS signal and an ADS-B signal, or may be capable of receiving a position signal other than an AIS signal or an ADS-B signal.

[0042] The receiving means 30 may be able to receive one type of location signal, or two or more types of location signals. For example, the receiving means 30 may be able to receive both AIS signals and ADS-B signals. When the receiving means 30 is able to receive two or more types of location signals with different transmission frequency bands, the anomalous propagation information output device 20 can output information about the occurrence of anomalous propagation in each of the transmission frequency bands.

[0043] The source that transmits the location signal may be mounted on a mobile object such as a ship or an aircraft, or may be fixedly installed. For example, the source may be installed in the area where the occurrence of abnormal propagation is detected.

[0044] The transmission location acquisition unit 21 may acquire the transmission location information by receiving, from the receiving means 30, the transmission location information included in the location signal received by the receiving means 30. In this case, the receiving means 30 extracts the transmission location information from the location signal.

[0045] Furthermore, the origination location acquisition unit 21 may acquire the origination location information by extracting the origination location information from the location signal received by the receiving means 30.

[0046] The receiving position acquisition unit 22 acquires receiving position information. The receiving position information is information indicating the receiving position. The receiving position is the position of the receiving means 30.

[0047] The reception position acquisition unit 22 may acquire reception position information from, for example, a positioning means (not shown) mounted on the mobile object 50. The positioning means may measure the position of the mobile object 50 using, for example, a Global Navigation Satellite System (GNSS). In this case, when the reception means 30 receives a position signal, the reception position acquisition unit 22 acquires position information of the reception means 30 (mobile object 50) from the positioning means.

[0048] Furthermore, the receiving position acquisition unit 22 may acquire the receiving position information from a storage means (not shown) inside or outside the abnormal propagation information output device 20. For example, the positioning means may locate the position of the receiving means 30 at predetermined time intervals and store the position information in the storage means in association with information on the date and time of positioning. The receiving position acquisition unit 22 may then acquire, from the storage means, information on the position of the receiving means 30 at the date and time when the receiving means 30 received the position signal, as the receiving position information. In this case, the transmission position acquisition unit 21 receives, from the receiving means 30, information on the date and time when the receiving means 30 received the position signal.

[0049] The calculation unit 23 calculates the distance between two points based on the transmitting position information and the receiving position information. The distance between two points is the distance between the transmitting position and the receiving position. The distance between two points may be calculated based on the latitude and longitude of the transmitting position and the receiving position, or may be calculated taking into account the altitude of the transmitting position and the receiving position.

[0050] The output unit 24 generates and outputs anomalous propagation information. The anomalous propagation information is information regarding the occurrence of anomalous propagation of radio waves. When the value of the point-to-point distance calculated by the calculation unit 23 is greater than a predetermined specified value, the output unit 24 determines that anomalous propagation may be occurring between the transmitting position and the receiving position. Then, the output unit 24 generates anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position. Note that, hereinafter, information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position may be referred to as occurrence anomalous information.

[0051] The specified value may be a value based on the distance over which the location signal is expected to reach if there is no abnormal propagation between the transmitting position and the receiving position. The distance over which the location signal is expected to reach if there is no abnormal propagation between the transmitting position and the receiving position may hereinafter be referred to as the normal reach distance. The specified value may be, for example, a value obtained by adding a predetermined additional value to the normal reach distance. The specified value may be predetermined or may be calculated by the calculation unit 23 or the output unit 24.

[0052] The specified value may be determined for each type of position signal. For example, if the approximate normal reach of a position signal is known, a value based on the approximate normal reach may be the specified value for the position signal. For example, the normal reach of an AIS signal is said to be approximately 30 to 50 km when the source is a ship. Therefore, if the position signal is an AIS signal, the specified value may be determined in advance to, for example, 60 km.

[0053] The specified value may also be a value based on the line-of-sight distance of the radio waves. For example, the line-of-sight distance may be the length from the transmitting position to the point of contact with the Earth on a tangent line drawn from the transmitting position to the Earth. This length is an approximate normal reach distance when the altitude of the receiving point is zero and there are no obstacles between the transmitting position and the receiving point. In this case, the line-of-sight distance is a value calculated based on the altitude of the transmitting position. The line-of-sight distance may also take into account the altitude of the receiving means 30. The line-of-sight distance may also take into account the refractive index of the radio waves in the atmosphere. When a value based on the line-of-sight distance of the radio waves is the specified value, the specified value may be predetermined as a value corresponding to the altitude of the transmitting position. The specified value may also be calculated by the calculation unit 23 or the output unit 24 based on the altitude of the transmitting position. It is assumed that information on the altitude of the transmitting position is included in the transmitting position information.

[0054] Furthermore, the specified value is not limited to the line-of-sight distance described above, and may be calculated based on other methods for calculating the normal reach distance.

[0055] The anomalous propagation information may include, as information (occurrence anomalous information), transmission location information when the value of the point-to-point distance calculated by the calculation unit 23 is greater than a specified value, indicating that anomalous propagation may be occurring between the transmission location and the receiving location. This allows a person who confirms the anomalous propagation information to understand that anomalous propagation may be occurring between the transmission location indicated by the transmission location information and the receiving means 30, or that anomalous propagation may be occurring in the direction of the transmission location as seen from the receiving means 30.

[0056] Furthermore, the anomalous propagation information may be image information for displaying an image showing information about the occurrence of anomalous propagation on a display means (not shown). In this case, the output unit 24 outputs the anomalous propagation information to the display means, thereby causing the display means to display an image showing information about the occurrence of anomalous propagation. In this case, the image showing the information about the occurrence of anomalous propagation may display on a map the origination position when the value of the point-to-point distance calculated by the calculation unit 23 is greater than a specified value. Note that, hereinafter, the image showing information about the occurrence of anomalous propagation may be referred to as an anomalous propagation image.

[0057] FIG. 8 shows an example of an anomalous propagation image. As shown in the example of FIG. 8, the anomalous propagation information includes transmission location information. The anomalous propagation information may also include reception location information. The anomalous propagation information may also include information indicating an area where anomalous propagation may be occurring (anomalous propagation occurrence area). For example, as shown in this figure, the area between the reception location and the transmission location may be displayed in the anomalous propagation image as an area where anomalous propagation may be occurring.

[0058] This allows a person who checks the anomalous propagation image to easily understand that anomalous propagation may be occurring between the receiving means 30 and the transmission location, as well as the area and direction in which anomalous propagation may be occurring.

[0059] FIG. 9 shows another example of an abnormal propagation image.

[0060] The abnormal propagation information may include information about two or more receiving means. For example, as shown in Fig. 6, if the abnormal propagation information output device 20 can acquire information about two or more receiving means, the abnormal propagation information may include information about the receiving means. Furthermore, the abnormal propagation information output device 20 may receive information about a position signal received by a receiving means mounted on another mobile body from an abnormal propagation information output device mounted on another mobile body, and output the received information together with image information.

[0061] The abnormal propagation information may also include date and time information. The date and time information may be information on the date and time when the receiving means 30 received the location signal. The abnormal propagation information output by the output unit 24 may also be abnormal propagation information at a date and time specified by a user. For example, the output unit 24 may store the abnormal propagation information including the date and time information in a storage means (not shown) inside or outside the abnormal propagation information output device 20. Then, the output unit 24 may obtain the abnormal propagation information including the date and time specified by the user as date and time information from the storage means, and output it to a display means or a predetermined output destination.

[0062] The anomalous propagation information may also include information about the type of the position signal. For example, if the position signal received by the receiving means 30 is an AIS signal, the anomalous propagation information may include information that the position signal received by the receiving means 30 is an AIS signal.

[0063] The anomalous propagation image may also display the altitude of the emission source. In this case, the emission location information includes information on the latitude, longitude, and altitude of the emission source. The altitude of the emission source is displayed on the anomalous propagation image based on the emission location information.

[0064] The abnormal propagation information may also include information about the normal reach of the location signal. The information about the normal reach may be, for example, the normal reach or the specified value. As described above, the normal reach and the specified value may be predetermined values or calculated values.

[0065] Furthermore, the abnormal propagation information may include information on the reception frequency at the receiving means 30 of the position signal.

[0066] Furthermore, the abnormal propagation information may include control information for controlling the transmitting means that transmits the wireless signal. For example, if the transmitting means transmits a signal when abnormal propagation is occurring, the transmitted signal may propagate a longer distance than expected, and may be received by an undesired party. This may also cause radio wave interference. Therefore, the control performed by the control information may be control for mitigating inconveniences caused by the signal transmitted by the transmitting means propagating a longer distance than expected.

[0067] When a signal that would not normally reach the receiving means 30 reaches the receiving means 30 due to anomalous propagation, conversely, a signal transmitted from near the receiving means 30 may also reach a position that it would not normally reach due to anomalous propagation. Therefore, the control information may be control information for controlling a transmitting means located near (for example, within a predetermined distance from) the receiving means 30. For example, the transmitting means located near the receiving means 30 may be the transmitting means 60 included in the mobile object 51 that includes the receiving means 30 in FIG. 5.

[0068] Furthermore, for example, a signal propagating through an area where anomalous propagation may occur may experience anomalous propagation. Therefore, the transmitting means to be controlled by the control information may be a transmitting means that transmits a signal that may propagate through an area where anomalous propagation may occur. For example, the transmitting means to be controlled by the control information may be a transmitting means located within a predetermined distance from an area where anomalous propagation may occur. The area where anomalous propagation may occur is, for example, an area between a transmitting position and a receiving position when the value of the point-to-point distance is greater than a specified value. Furthermore, the predetermined distance here may be a distance based on the normal transmission distance. Furthermore, the transmitting means to be controlled may be a transmitting means, among the transmitting means 60-1 to 60-N in FIG. 6, that is located within a predetermined distance from an area where anomalous propagation may occur.

[0069] The control performed by the control information may also be control of a transmission signal transmitted by the transmitting means. For example, the control performed by the control information may be control to reduce the output level of the transmission signal. The control performed by the control information may also be control to reduce the output level of the transmission signal in a direction where anomalous propagation may be occurring. The control performed by the control information may also be control to stop transmission of the transmission signal. The control performed by the control information may also be control to change the transmission frequency of the transmission signal to a frequency that is not included in a frequency band where anomalous propagation may be occurring.

[0070] Furthermore, the control performed by the control information may be a control to move the mobile body 51 on which the transmitting means 60 is mounted. For example, the control performed by the control information may be a control to move the mobile body 51 so as to move away from an area where abnormal propagation may occur.

[0071] Also, as shown in Figure 6, when the abnormal propagation information output device 20 acquires transmission location information for two or more receiving means, the output unit 24 may transmit control information to a transmitting means located near an area where abnormal propagation may be occurring.

[0072] Furthermore, the output unit 24 may transmit control information for controlling a transmitting means or a mobile object that has a transmitting means for transmitting a signal but does not have a receiving means for receiving a position signal. For example, if the source of the position signal received by the receiving means 30 can be controlled from the abnormal propagation information output device 20, the output unit 24 may transmit control information to the source.

[0073] In addition, control of the transmission means 60 and the mobile body 51 may be determined based on the abnormal propagation information at the destination of the abnormal propagation information (such as the transmission means 60 or a control means (not shown) that controls the mobile body 51), rather than at the output unit 24.

[0074] Furthermore, the anomalous propagation information output from the output unit 24 may be used to estimate future occurrences of anomalous propagation. For example, future occurrences of anomalous propagation may be estimated based on the anomalous propagation information output from the output unit 24 and meteorological information (weather, temperature, wind speed, sea surface temperature, etc.). The meteorological information may be collected by the mobile object 50 or may be provided from a meteorological information server (not shown) that provides meteorological information.

[0075] Next, an example of the operation flow of the anomaly propagation information output device 20 and the receiving means 30 will be described with reference to Fig. 10 and Fig. 11. Fig. 10 is a diagram showing an example of the operation flow of the receiving means 30. Fig. 11 is a diagram showing an example of the operation flow of the anomaly propagation information output device 20.

[0076] The receiving means 30 attempts to receive a location signal at a predetermined timing, for example, at predetermined time intervals or before transmitting a signal from the transmitting means 60. When the receiving means 30 receives a location signal (step S201 in FIG. 10), it extracts transmission location information from the location signal. The receiving means 30 also transmits the transmission location information to the transmission location acquisition unit 21 of the abnormal propagation information output device 20 (step S202). The receiving means 30 may also transmit information on the date and time when the location signal was received to the transmission location acquisition unit 21.

[0077] The transmission position acquisition unit 21 of the abnormal propagation information output device 20 receives transmission position information from the receiving means 30 (step S301 in FIG. 11). Furthermore, the receiving position acquisition unit 22 acquires receiving position information (step S302). For example, the receiving position acquisition unit 22 acquires, from the storage means, the position of the receiving means 30 at the date and time when the position signal was received by the receiving means 30, as receiving position information.

[0078] The calculation unit 23 calculates the distance between the two points based on the originating position information and the receiving position information (step S303).

[0079] If the value of the point-to-point distance is greater than a predetermined value (YES in step S304), the output unit 24 determines that there is a possibility that anomalous propagation is occurring between the transmitting position and the receiving position. Then, the output unit 24 generates and outputs anomalous propagation information including information indicating that there is a possibility that anomalous propagation is occurring between the transmitting position and the receiving position (step S305).

[0080] As described above, in the second embodiment of the present disclosure, the anomalous propagation information output device 20 includes a transmission location acquisition unit 21, a reception location acquisition unit 22, a calculation unit 23, and an output unit 24. The transmission location acquisition unit 21 acquires transmission location information contained in a signal received by a receiving means. The receiving means receives a signal including the transmission location information. The transmission location information is information indicating the transmission location. The transmission location is the location of the source that transmits the signal. The reception location acquisition unit 22 acquires the reception location information. The reception location information is information indicating the reception location. The reception location is the location of the receiving means. The calculation unit 23 calculates the point-to-point distance based on the transmission location information and the reception location information. The point-to-point distance is the distance between the transmission location and the reception location. The output unit 24 generates and outputs anomalous propagation information. The anomalous propagation information is information regarding the occurrence of anomalous propagation of radio waves. When the value of the point-to-point distance is greater than a predetermined specified value, the output unit 24 generates abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmitting position and the receiving position.

[0081] As a result, the anomalous propagation information output device 20 can detect the possibility of anomalous propagation occurring by detecting that a signal that has propagated a distance greater than a specified value has reached the receiving means.The anomalous propagation information output device 20 can then output anomalous propagation information including information indicating the possibility of anomalous propagation occurring.This makes it possible to output information regarding the occurrence of anomalous propagation.

[0082] Furthermore, the signal containing the transmission location information may be at least one of an AIS signal and an ADS-B signal, which allows the anomalous propagation information output device 20 to output information about the occurrence of anomalous propagation in at least one of the frequency bands in which the AIS signal is transmitted and the frequency band in which the ADS-B signal is transmitted.

[0083] Furthermore, the receiving means 30 may be capable of receiving both AIS signals and ADS-B signals. When the receiving means 30 is capable of receiving two or more types of location signals having different transmission frequency bands, the anomalous propagation information output device 20 can output information regarding the occurrence of anomalous propagation in each of the transmission frequency bands.

[0084] The anomalous propagation information also includes information on the transmission location when the value of the distance between the two points is greater than a specified value. This allows a person who confirms the anomalous propagation information to understand that anomalous propagation may be occurring between the transmission location indicated by the transmission location information and the receiving means 30, or that anomalous propagation may be occurring in the direction of the transmission location as seen from the receiving means 30.

[0085] The anomalous propagation information may also include image information for displaying an image on a display means. The image may display the transmission location when the point-to-point distance value is greater than a specified value on a map. This allows a person who checks the anomalous propagation image to easily understand that anomalous propagation may be occurring between the receiving means 30 and the transmission location, as well as the area and direction in which anomalous propagation may be occurring.

[0086] The specified value may also be a value based on a normal reach distance, which is the distance a signal is expected to reach if there is no anomalous propagation between the transmitting location and the receiving location. The specified value may also be a value determined for each type of signal that includes transmitting location information. The specified value may also be a value based on the line-of-sight distance of radio waves. The line-of-sight distance may also be a value calculated based on the altitude of the transmitting location. This makes it possible to detect the possibility of anomalous propagation occurring.

[0087] The abnormal propagation information may also include control information for controlling at least one of the transmitting means that transmits the wireless signal and the mobile object on which the transmitting means is mounted, thereby making it possible to reduce inconveniences caused by abnormal propagation of the signal transmitted by the transmitting means.

[0088] [Hardware configuration example] An example of the configuration of hardware resources for realizing the anomaly propagation information output device (10, 20) in each of the above-described embodiments of the present disclosure using one information processing device (computer) will be described. Note that the anomaly propagation information output device may be physically or functionally realized using at least two information processing devices. The anomaly propagation information output device may also be realized as a dedicated device. Also, only some of the functions of the anomaly propagation information output device may be realized using an information processing device.

[0089] 12 is a diagram schematically illustrating an example of the hardware configuration of an information processing device that can realize the anomaly propagation information output device according to each embodiment of the present disclosure. The information processing device 90 includes a communication interface 91, an input / output interface 92, a computing device 93, a storage device 94, a nonvolatile storage device 95, and a drive device 96.

[0090] 1 can be realized by a communication interface 91 and a computing device 93. In addition, the calculation unit 13 can be realized by the computing device 93.

[0091] The communication interface 91 is a communication means for the anomaly propagation information output device of each embodiment to communicate with an external device via wired and / or wireless communication. When the anomaly propagation information output device is realized using at least two information processing devices, these devices may be connected via the communication interface 91 so that they can communicate with each other.

[0092] The input / output interface 92 is a man-machine interface including a keyboard as an example of an input device and a display as an output device.

[0093] The arithmetic device 93 is realized by a general-purpose central processing unit (CPU), a microprocessor, or other arithmetic processing device, and a plurality of electric circuits. The arithmetic device 93 can, for example, read various programs stored in a nonvolatile storage device 95 into the storage device 94 and execute processing in accordance with the read programs.

[0094] The storage device 94 is a memory device such as a RAM (Random Access Memory) that can be accessed by the arithmetic device 93, and stores programs, various data, etc. The storage device 94 may be a volatile memory device.

[0095] The nonvolatile storage device 95 is a nonvolatile storage device such as a ROM (Read Only Memory) or a flash memory, and is capable of storing various programs, data, and the like.

[0096] The drive device 96 is, for example, a device that processes reading and writing of data from and to a recording medium 97, which will be described later.

[0097] The recording medium 97 is any recording medium capable of recording data, such as an optical disk, a magneto-optical disk, or a semiconductor flash memory.

[0098] Each embodiment of the present disclosure may be realized, for example, by configuring an abnormality propagation information output device using the information processing device 90 illustrated in FIG. 12 and supplying a program capable of realizing the functions described in each of the above embodiments to this abnormality propagation information output device.

[0099] In this case, the embodiment can be realized by having the arithmetic unit 93 execute a program supplied to the anomaly propagation information output device. It is also possible to configure some, but not all, of the functions of the anomaly propagation information output device in the information processing unit 90.

[0100] Furthermore, the anomaly propagation information output device may be configured so that the program is recorded on a recording medium 97 and stored in the non-volatile storage device 95 as appropriate when the anomaly propagation information output device is shipped or when it is in operation. In this case, the program may be supplied by installing it in the anomaly propagation information output device using an appropriate jig during the manufacturing stage before shipping or during operation. The program may also be supplied by a general procedure such as downloading it from an external source via a communication line such as the Internet.

[0101] Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes.

[0102] (Appendix 1) a transmission location acquisition unit that acquires transmission location information included in a signal received by a receiving unit that receives a signal including transmission location information indicating a transmission location that is the location of a source that transmits a signal; a receiving position acquisition unit that acquires receiving position information indicating a receiving position that is the position of the receiving means; a calculation unit that calculates a point-to-point distance between the transmission position and the reception position based on the transmission position information and the reception position information; an output unit that generates and outputs anomalous propagation information, which is information regarding the occurrence of anomalous radio wave propagation; Equipped with the output unit generates the anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position when the value of the point-to-point distance is greater than a predetermined specified value. Anomaly propagation information output device.

[0103] (Appendix 2) The signal including the transmission location information is at least one of an AIS signal and an ADS-B signal, 2. The abnormal propagation information output device according to claim 1.

[0104] (Appendix 3) The abnormal propagation information includes the origination location information when the value of the point-to-point distance is greater than the specified value. 10. The abnormal propagation information output device according to claim 1 or 2.

[0105] (Appendix 4) the abnormal propagation information includes image information for displaying an image on a display means, and the image displays the transmission location on a map when the value of the point-to-point distance is greater than the specified value. 4. An abnormal propagation information output device according to any one of appendix 1 to appendix 3.

[0106] (Appendix 5) The specified value is a value based on a normal reach distance, which is a distance that a signal is expected to reach if there is no abnormal propagation between the transmitting position and the receiving position. 5. An abnormal propagation information output device according to any one of appendix 1 to appendix 4.

[0107] (Appendix 6) the specified value is a value determined for each type of signal including the origination location information; 6. An abnormal propagation information output device according to claim 5.

[0108] (Appendix 7) The specified value is a value based on the line-of-sight distance of radio waves. 7. An abnormal propagation information output device according to claim 5 or 6.

[0109] (Appendix 8) The line-of-sight distance is a value calculated based on the altitude of the transmission location. 8. The abnormal propagation information output device according to claim 7.

[0110] (Appendix 9) the abnormal propagation information includes control information for controlling at least one of a transmitting means for transmitting a wireless signal and a mobile object on which the transmitting means is mounted; 9. An abnormal propagation information output device according to any one of appendices 1 to 8.

[0111] (Appendix 10) a receiving means for receiving a signal including transmission location information indicating a transmission location that is the location of a source transmitting a signal, and acquiring the transmission location information included in the received signal; acquiring reception position information indicating a reception position that is the position of the receiving means; calculating a point-to-point distance between the transmission location and the reception location based on the transmission location information and the reception location information; generating and outputting anomalous propagation information, which is information regarding the occurrence of anomalous radio wave propagation; When the value of the distance between the two points is greater than a predetermined value, the abnormal propagation information is generated, the abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmitting position and the receiving position. Anomaly propagation information output method.

[0112] (Appendix 11) On the computer, a transmission location acquisition function for acquiring transmission location information included in a signal received by a receiving means for receiving a signal including transmission location information indicating a transmission location that is the location of a source transmitting a signal; a receiving position acquisition function for acquiring receiving position information indicating a receiving position that is the position of the receiving means; a calculation function for calculating a point-to-point distance between the transmission position and the reception position based on the transmission position information and the reception position information; an output function that generates and outputs anomalous propagation information, which is information regarding the occurrence of anomalous radio wave propagation; Realize this, the output function generates the anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position when the value of the point-to-point distance is greater than a predetermined specified value. A program for outputting abnormal propagation information.

[0113] Furthermore, some or all of the configurations described in Supplementary Notes 2 to 9, which are dependent on Supplementary Note 1, may also be dependent on Supplementary Notes 10 and 11 in the same dependent relationship as Supplementary Notes 2 to 9. Furthermore, not limited to Supplementary Notes 1, 10, and 11, but within the scope of each of the above-mentioned embodiments, some or all of the configurations described as Supplements may also be dependent on various hardware, software, various recording means for recording software, or systems.

[0114] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate. [Explanation of symbols]

[0115] 10, 20 Abnormal propagation information output device 11, 21 Transmission location acquisition unit 12, 22 Receiving position acquisition unit 13, 23 Calculation section 30, 30-i Receiving means 40, 41 Anomaly propagation information output system 50, 51, 52-i Mobile 60, 60-i Transmission means 90 Information processing equipment 91 Communication Interface 92 Input / Output Interface 93 Arithmetic unit 94 Storage device 95 Non-volatile storage devices 96 Drive Device 97 Recording Media

Claims

1. a transmission location acquisition unit that acquires transmission location information included in a signal received by a receiving unit that receives a signal including transmission location information indicating a transmission location that is the location of a source that transmits a signal; a receiving position acquisition unit that acquires receiving position information indicating a receiving position that is the position of the receiving means; a calculation unit that calculates a point-to-point distance between the transmission position and the reception position based on the transmission position information and the reception position information; an output unit that generates and outputs anomalous propagation information, which is information regarding the occurrence of anomalous radio wave propagation; Equipped with the output unit generates the anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position when the value of the point-to-point distance is greater than a predetermined specified value. Anomaly propagation information output device.

2. The signal including the transmission location information is at least one of an AIS (Automatic Identification System) signal and an ADS-B (Automatic Dependent Surveillance Broadcast) signal. The abnormal propagation information output device according to claim 1.

3. The abnormal propagation information includes the origination location information when the value of the point-to-point distance is greater than the specified value.

3. The abnormal propagation information output device according to claim 1 or 2.

4. the abnormal propagation information includes image information for displaying an image on a display means, and the image displays the transmission location on a map when the value of the point-to-point distance is greater than the specified value.

3. The abnormal propagation information output device according to claim 1 or 2.

5. The specified value is a value based on a normal reach distance, which is a distance that a signal is expected to reach if there is no abnormal propagation between the transmitting position and the receiving position.

3. The abnormal propagation information output device according to claim 1 or 2.

6. the specified value is a value determined for each type of signal including the origination location information; The abnormal propagation information output device according to claim 5.

7. The specified value is a value based on the line-of-sight distance of radio waves. The abnormal propagation information output device according to claim 5.

8. the abnormal propagation information includes control information for controlling at least one of a transmitting means for transmitting a wireless signal and a mobile object on which the transmitting means is mounted; 3. The abnormal propagation information output device according to claim 1 or 2.

9. a receiving means for receiving a signal including transmission location information indicating a transmission location that is the location of a source transmitting a signal, and acquiring the transmission location information included in the received signal; acquiring reception position information indicating a reception position that is the position of the receiving means; calculating a point-to-point distance between the transmission location and the reception location based on the transmission location information and the reception location information; generating and outputting anomalous propagation information, which is information regarding the occurrence of anomalous radio wave propagation; When the value of the distance between the two points is greater than a predetermined value, the abnormal propagation information is generated, the abnormal propagation information including information indicating that abnormal propagation may be occurring between the transmitting position and the receiving position. Anomaly propagation information output method.

10. On the computer, a transmission location acquisition function for acquiring transmission location information included in a signal received by a receiving means for receiving a signal including transmission location information indicating a transmission location that is the location of a source transmitting a signal; a receiving position acquisition function for acquiring receiving position information indicating a receiving position that is the position of the receiving means; a calculation function for calculating a point-to-point distance between the transmission position and the reception position based on the transmission position information and the reception position information; an output function that generates and outputs anomalous propagation information, which is information regarding the occurrence of anomalous radio wave propagation; Realize this, the output function generates the anomalous propagation information including information indicating that anomalous propagation may be occurring between the transmitting position and the receiving position when the value of the point-to-point distance is greater than a predetermined specified value. A program for outputting abnormal propagation information.

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