JP2009300146A - Aircraft position measuring system, signal kind determination method, center station, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To autonomously determine the kind of a signal transmitted from an aircraft, in an aircraft position measuring system. <P>SOLUTION: The system includes a transmission pattern storage part 7 for storing information of a transmission pattern of a signal, and a signal kind determination part 6 for determining the kind of the signal based on the information of the transmission pattern stored in the transmission pattern storage part 7 after receiving each signal by regarding it entirely as the same kind of signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an aircraft position measurement system, a signal type determination method, a center station, and a program.

  The aircraft position measurement system will be described with reference to FIG. FIG. 9 is a conceptual diagram of an aircraft position measurement system. As shown in FIG. 9, the aircraft position measurement system includes a plurality of receiving stations Rl to R5 whose position information is determined and one center station C. The plurality of receiving stations Rl to R5 each receive a signal transmitted from one aircraft A. The center station C measures the position and altitude of the aircraft A based on the position information of the plurality of receiving stations R1 to R5 and the reception time difference information when the signals are received by the plurality of receiving stations R1 to R5. In addition, since this measuring method is a technique widely known as a hyperbolic positioning method, description in this specification is omitted. Such an aircraft position measurement system is called a multilateration system.

  The above signals are generally referred to as mode A code and mode C code. The mode A code is identification information given to each flight plan of the aircraft A. In other words, it is identification information that is given only for the period from when the aircraft A takes off until landing. The mode C code is a signal including altitude information self-reported by the aircraft A. Usually, the mode A code and the mode C code form a transmission pattern that is continuously combined. As other signals, there is a mode S code permanently given to the aircraft A.

  Also, as shown in FIG. 9, a line L is provided between the center station C and the airway monitoring radar station R. Through this line, the center station C and the airway monitoring radar station R can cooperate to execute processing.

  For example, the aircraft A does not autonomously transmit the mode A code and the mode C code, but responds with the mode A code and the mode C code to the interrogation signal from the airway surveillance radar station R. . Accordingly, the center station C may confirm whether the airway surveillance radar station R has transmitted the interrogation signal so as to respond with the mode A code, or has transmitted the interrogation signal so as to respond with the mode C code. it can. Thereby, the center station C can distinguish between the mode A code and the mode C code as a response to the inquiry signal.

JP-A-8-105966

  A conventional aircraft position measurement system must cooperate with an airway monitoring radar station. Therefore, it is necessary to provide a line between the center station and the airway monitoring radar station. Further, a response signal is transmitted from the aircraft at a timing immediately after the inquiry signal is transmitted from the airway monitoring radar station. Therefore, the center station needs to recognize in real time the timing at which the interrogation signal is transmitted from the airway monitoring radar station.

  Therefore, since a high-quality line with little delay is required, it is difficult to reduce the cost and man-hour required for the line facility. In particular, when attempting to monitor an airspace deviating from the airspace monitoring radar station by an aircraft position measurement system, the distance between the center station and the airway monitoring radar station is often long. It is expensive to secure a high-quality line over such a long distance.

  The present invention has been made under such a background, and provides an aircraft position measurement system, a signal type determination method, a center station, and a program capable of autonomously determining the type of signal transmitted by an aircraft. The purpose is to provide.

  The present invention comprises a plurality of receiving stations whose position information is determined and one center station, the plurality of receiving stations each comprising means for receiving a signal transmitted from one aircraft, Means for measuring the position and altitude of the aircraft based on the position information of the receiving station and the reception time difference information when the signals are received by the plurality of receiving stations, and the signal includes a plurality of types of signals. It is the aircraft position measurement system which has a specific transmission pattern by the combination of these signals.

  Here, the feature of the present invention is that the transmission pattern storage means for storing the transmission pattern information and the transmission pattern stored in the transmission pattern storage means after receiving all the signals as signals of the same type. And signal type determination means for determining the type of signal based on the information.

  Further, when the present invention is viewed from the viewpoint of the signal type determination method, the present invention includes a plurality of receiving stations whose position information is determined and one center station, and the plurality of receiving stations transmit from one aircraft. The center station measures the position and altitude of the aircraft based on the positional information of the plurality of receiving stations and the reception time difference information when the signals are received by the plurality of receiving stations, This is a signal type determination method applied to an aircraft position measurement system that includes a plurality of types of signals and has a specific transmission pattern based on a combination of the plurality of types of signals.

  Here, the feature of the present invention is that the step of storing the transmission pattern information and the transmission pattern information stored by the processing of the step of storing after receiving all the signals as signals of the same type. And determining the type of signal based on the above.

  Further, when the present invention is viewed from the point of view of the center station, the present invention is based on the reception of the position information of a plurality of receiving stations whose position information has been determined and the signals transmitted from one aircraft by the plurality of receiving stations. The center station is provided with means for measuring the position and altitude of the aircraft based on the reception time difference information.

  Here, a feature of the present invention is that the signal includes a plurality of types of signals, has a specific transmission pattern based on a combination of the plurality of types of signals, and stores transmission pattern information. After receiving all the signals as signals of the same type and receiving them, signal type determining means for determining the signal type based on the transmission pattern information stored in the transmission pattern storage means is provided.

  Further, when viewed from the viewpoint of a program, the present invention installs in the information processing apparatus, so that the information processing apparatus includes position information of a plurality of receiving stations whose position information is determined and a plurality of receiving stations. This is a program that realizes the function of the center station having the function of measuring the position and altitude of the aircraft based on the reception time difference information when signals transmitted from one aircraft are received.

  Here, a feature of the present invention is that the signal includes a plurality of types of signals, has a specific transmission pattern based on a combination of the plurality of types of signals, and stores a transmission pattern information. The signal type determination function for determining the signal type based on the transmission pattern information stored in the transmission pattern storage function after receiving all signals as the same type of signal is realized.

  ADVANTAGE OF THE INVENTION According to this invention, the kind of signal which an aircraft transmits can be determined autonomously.

(First embodiment)
An aircraft position measurement system according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an overall configuration diagram of an aircraft position measurement system according to a first embodiment. FIG. 2 is a diagram showing a transmission pattern of the mode A code and the mode C code. FIG. 3 is a flowchart illustrating a signal type determination procedure according to the first embodiment.

  As shown in FIG. 1, the aircraft position measurement system according to the first embodiment includes a plurality of receiving stations Rl to R5 whose position information is determined and one center station C. Each of the plurality of receiving stations Rl to R5 includes means (not shown) for receiving signals transmitted from one aircraft A. The center station C receives the position information of the plurality of reception stations R1 to R5 stored in the reception station position storage unit 3 and the signals received by the plurality of reception stations R1 to R5 collected by the reception information collection unit 1 The position analysis unit 2 is provided as means for measuring the position (latitude / longitude) and altitude of the aircraft A based on the received time difference information.

  Further, a signal extraction unit 4 that extracts the signal from the reception signal collected by the reception information collection unit 1 and a signal storage unit 5 that temporarily stores the signal extracted by the signal extraction unit 4 are provided.

  As shown in FIG. 2, the signal includes a mode A code and a mode C code, and has a specific transmission pattern by a combination of the mode A code and the mode C code. In the example of FIG. 2, the mode C code is transmitted once after the mode A code is transmitted twice in succession. A transmission pattern storage unit 7 is provided as transmission pattern storage means for storing information on this transmission pattern.

  In the first embodiment, after receiving all the above signals as signals of the same type (that is, mode A code), based on the transmission pattern information stored in the transmission pattern storage unit 7, the signal type A signal type determination unit 6 is provided as signal type determination means for determining (that is, mode A code or mode C code).

  Next, the processing procedure of the signal type determination unit 6 will be described with reference to the flowchart of FIG. As shown in FIG. 3, the signal type determination unit 6 acquires transmission pattern information from the transmission pattern storage unit 7 (step S1), and reads a signal from the signal storage unit 5 (step S2). At this time, if the same type of signal continues twice (Yes in step S3), the signal type determination unit 6 determines that the subsequent signal is a mode C code (step S4). Accordingly, the signal type determination unit 6 can inevitably determine the same type of signal that has been repeated twice as a mode A code (step S5).

(Effects of the first embodiment)
According to the first embodiment, the mode A code and the mode C code can be autonomously determined based on the transmission pattern information. As a result, the center station C does not need to confirm in real time the timing at which the airway monitoring radar station R transmits the interrogation signal to the aircraft A, and the line between the airway monitoring radar station R and the center station C is not necessary. It is possible to increase the delay tolerance in. Therefore, the line installation cost and man-hours can be reduced.

(Second embodiment)
An aircraft position measurement system according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an overall configuration diagram of the aircraft position measurement system according to the second embodiment. In the second embodiment, the center station C and the airway monitoring radar station R cooperate to execute processing. At this time, the real-time property is not important. Therefore, the delay tolerance on the line L between the center station C and the airway monitoring radar station R can be increased. Therefore, the equipment cost and man-hour of the line L can be kept low.

  In the second embodiment, a monitoring report receiving unit 9 is provided as monitoring report receiving means for receiving an aircraft monitoring report from the airway monitoring radar station R. The mode A code and the mode C code determined by the signal type determination unit 6 are stored in the mode A code / mode C code storage unit 8. As an identification information search means for searching for a mode A code that matches the mode A code received by the center station C from the aircraft monitoring report received by the monitoring report receiving unit 9 with reference to the mode A code / mode C code storage unit 8 The identification information search unit 10 is provided.

  Further, the identification information search unit 10 matches the mode A code included in the aircraft monitoring report from the mode A codes stored in the mode A code / mode C code storage unit 8 in addition to the identification information search means. When the mode A code is retrieved, there is also reliability determination means for determining the mode A code and the mode C code received by the center station C as a highly reliable signal.

  That is, the mode A code is identification information given to one flight plan of the aircraft A, and as a rule, the situation where the same mode A code is given to different aircraft in the same airspace in the same time zone. It can't happen. Therefore, if the same mode A code is acquired in both the airway monitoring radar station R and the center station C, it is almost certain that the presence of the same aircraft A is detected by the airway monitoring radar station R and the center station. This is confirmed by C.

  The identification information retrieval unit 10 could not retrieve a mode A code that matches the mode A code included in the aircraft monitoring report from the mode A codes stored in the mode A code / mode C code storage unit 8. In such a case, an error is output and the administrator is notified of the possibility of an error.

(Effect of the second embodiment)
According to the second embodiment, the reliability of the mode A code and the mode C code determined in the first embodiment can be further improved.

(Third embodiment)
An aircraft position measurement system according to a third embodiment will be described with reference to FIGS. FIG. 5 is a conceptual diagram of the aircraft position measurement system according to the third embodiment. As shown in FIG. 5, the aircraft position measurement system according to the third embodiment is measured with the altitude information reported from the aircraft A and the position analysis unit 2 (not shown in FIG. 5) as the measurement target. The altitude information collating unit 11 includes a comparing unit 12 that is a means for comparing altitude information with the mode A code of the aircraft A (step S10). Further, when the reported altitude information differs from the measured altitude information based on the comparison result of the comparison unit 12, the altitude information reported is corrected by the measured altitude information (No in step S11). The correction unit 13 is provided in the altitude information matching unit 11. In addition, the correction unit 13 of the altitude information collating unit 11 matches the altitude information reported from the aircraft A and the altitude information measured by the position analyzing unit 2 with the aircraft A as a measurement target (in step S11). Yes), altitude information confirmation information is transmitted to the airway monitoring radar station R. Further, the correction unit 13 of the altitude information collation unit 11 does not match the altitude information reported from the aircraft A and the altitude information measured by the position analysis unit 2 with the aircraft A as a measurement target (in step S11). No), the reported altitude information is corrected by the actually measured altitude information (step S12).

  Here, the mode S code will be described with reference to FIGS. FIG. 6 is a diagram for explaining the mode S batch question. FIG. 7 is a diagram for explaining the mode S individual question. As described above, the mode S code includes identification information permanently given to the aircraft A. That is, the mode A code is identification information given for each flight plan of the aircraft A. For this reason, it disappears when the flight plan of the aircraft A is completed, and a new mode A code is given when the aircraft A submits a new flight plan. On the other hand, the mode S code is not changed after the aircraft A is manufactured.

  FIG. 6 shows a situation where the radar apparatus of the airway monitoring radar station R is simultaneously projecting three machine shadows on the display. At this time, the aircraft monitoring radar station R makes an inquiry about the mode S code to all the aircraft (mode S collective question). In response to the mode S batch question, each aircraft is to respond to the airway monitoring radar station R with its own mode S code and altitude information measured by itself (referred to as reported altitude information).

  In the example of FIG. 6, aircraft # 1 responds with mode S code # 1 and declared altitude 3000 ft, aircraft # 2 responds with mode S code # 2 and reported altitude 3500 ft, and aircraft # 3 responds with mode S code. # 3, responding with a declaration altitude of 2000 ft.

  Next, FIG. 7 shows a situation where a mode S individual question is being made for one machine. The airway surveillance radar station R can transmit the mode S individual question by designating one specific aircraft using the mode S code of each aircraft acquired by the mode S batch question. The aircraft that has received the mode S individual question is supposed to respond with a mode A code together with its own mode S code and reporting altitude. In the example of FIG. 7, aircraft # 1 responds with mode S code # 1, declaration altitude 3000 ft, and mode A code “1001”. In this way, the airway monitoring radar station R can acquire the mode A code of each aircraft using the mode S code of each aircraft.

  Next, the air traffic control station having the airway monitoring radar station R can request the center station C to confirm the reported altitude using the acquired mode A code of each aircraft. That is, since the reported altitude is altitude information measured by an altitude measuring device mounted on each machine, if there is an abnormality in the altitude measuring device, there is a possibility that incorrect altitude information may be reported. Therefore, by comparing the actually measured altitude measured by the center station C with the reported altitude, it is possible to find and correct incorrect reported altitude information.

  FIG. 8 is a flowchart showing a processing procedure of the altitude information matching unit 11. As shown in FIG. 8, the altitude information matching unit 11 receives the mode A code and the reported altitude information from the airway monitoring radar station R via the air traffic control station (step S20). The altitude information collation unit 11 collates the received mode A code with the mode A code held by the center station C (step S21). If there is a matching mode A code (Yes in step S22), the comparison unit 12 of the altitude information matching unit 11 compares the reported altitude information corresponding to the mode A code with the actually measured altitude information (step S23). At this time, if there is no matching mode A code (No in step S22), the comparison unit 12 reports the fact to the air traffic control station (step S27). As a result of the comparison, if the reported altitude information and the measured altitude information match (Yes in step S24), the correction unit 13 of the altitude information collating unit 11 transmits information indicating that the altitude information has been confirmed to the air traffic control station ( Step S25). However, as a result of the comparison, if the reported altitude information and the measured altitude information do not match (No in step S24), the correction unit 13 of the altitude information collating unit 11 corrects the reported altitude information with the actually measured altitude information (step S26). ), And send the corrected altitude information to the Air Traffic Control Bureau. At this time, the correction unit 13 of the altitude information matching unit 11 may also transmit a report indicating that the correction has been made.

(Effect of the third embodiment)
According to the third embodiment, errors in the reported altitude information can be found and corrected using the measured altitude information of the center station C. For this reason, safe operation of the aircraft can be achieved.

(Example of the program)
An example of a program for realizing each function in the center station C of the present embodiment by installing in the information processing apparatus will be described. Here, the information processing apparatus is a general-purpose computer apparatus.

  By recording the program of this embodiment on a recording medium, the information processing apparatus can install the program of this embodiment using this recording medium. Or the program of a present Example can also be installed in an information processing apparatus directly from the server holding the program of a present Example via a network.

  Thereby, using the information processing apparatus, the reception information collection unit 1, the position analysis unit 2, the reception station position storage unit 3, the signal extraction unit 4, the signal storage unit 5, and the signal type determination in the center station C of the present embodiment. Functions of the unit 6, the transmission pattern storage unit 7, the mode A code / mode C code storage unit 8, the monitoring report reception unit 9, the identification information search unit 10, and the altitude information collation unit 11 can be realized. Other functions that can be realized by software may also be realized by the program of this embodiment.

  The program of this embodiment includes not only a program that can be directly executed by the information processing apparatus but also a program that can be executed by being installed on a hard disk or the like. Also included are those that are compressed or encrypted.

(Other embodiments)
The embodiment of the present invention can be variously modified without departing from the gist of the present invention. For example, a passenger plane is illustrated as aircraft A. However, the aircraft A may be various flying objects such as a helicopter, a jet fighter, and other flying objects. Further, the mode A code, the mode C code, and the mode S code have been described as examples. However, any signal having regularity in the transmission pattern can be used. Further, the regularity of the transmission pattern does not have to be constant. That is, it is only necessary to know the change schedule even for a signal whose transmission pattern changes from moment to moment. Further, a radar station that monitors an unspecified airspace may be provided instead of the airway monitoring radar station R that monitors a predetermined airway.

  The present invention can contribute to safe operation of an aircraft.

1 is an overall configuration diagram of an aircraft position measurement system according to a first embodiment. It is a figure which shows the transmission pattern of a mode A code and a mode C code. It is a flowchart which shows the signal kind determination procedure of 1st embodiment. It is a whole block diagram of the aircraft position measurement system of 2nd embodiment. It is a conceptual diagram of the aircraft position measurement system of 3rd embodiment. It is a figure for demonstrating a mode S batch question. It is a figure for demonstrating a mode S individual question. It is a flowchart which shows the process sequence of an altitude information collation part. 1 is a conceptual diagram of an aircraft position measurement system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reception information collection part, 2 Position analysis part (Measuring means), 3 Reception station position storage part, 4 Signal extraction part, 5 Signal storage part, 6 Signal type determination part (Signal type determination means), 7 Transmission pattern storage part (Transmission pattern storage means), 8 mode A code / mode C code storage section, 9 monitoring report receiving section (monitoring report receiving means), 10 identification information searching section (identification information searching means, reliability determining means), 11 altitude information Verification unit (means for comparison, correction means), 12 comparison unit (means for comparison), 13 correction unit (means for correction), A aircraft, C center station, R air route monitoring radar station, Rl to R5 receiving station ( Means to receive)

Claims (16)

A plurality of receiving stations whose position information is fixed, and one center station,
The plurality of receiving stations each include means for receiving signals transmitted from one aircraft,
The center station includes means for measuring the position and altitude of the aircraft based on position information of the plurality of receiving stations and reception time difference information when the signals are received by the plurality of receiving stations.
The signal includes a plurality of types of signals and has a specific transmission pattern by a combination of the plurality of types of signals.
In aircraft positioning system,
Transmission pattern storage means for storing information of the transmission pattern;
After all the signals are regarded as being of the same type and received, signal type determination means for determining the type of signal based on the transmission pattern information stored in the transmission pattern storage means,
An aircraft position measurement system comprising: The transmission pattern is a transmission pattern in which a signal of type n is continuously transmitted q times after a signal of type m is continuously transmitted p times.
The signal type determination means includes means for determining that a reception signal of the same type continued q times following the reception signal of the same type continued p times as a signal of type n.
The aircraft position measurement system according to claim 1. The signal includes identification information given to the aircraft for each flight plan,
Monitoring report receiving means for receiving an aircraft monitoring report from an airway monitoring radar station that monitors an airspace common to the receiving area of the receiving station;
Identification information search means for searching for identification information that matches the identification information included in the signal received by the receiving station from the aircraft monitoring report received by the monitoring report receiving means;
A reliability determination unit that determines the signal received by the receiving station as a highly reliable signal when the matching identification information is searched by the identification information search unit;
The aircraft position measurement system according to claim 2, further comprising: Means for comparing altitude information reported from an aircraft with altitude information measured by the means for measuring the aircraft as a measurement object based on identification information of the aircraft;
When the reported altitude information is different from the measured altitude information based on the comparison result of the means for comparing, means for correcting the reported altitude information with the measured altitude information;
The aircraft position measurement system according to any one of claims 1 to 3, further comprising: It has a plurality of receiving stations whose position information has been determined and one center station,
The plurality of receiving stations each receive a signal transmitted from one aircraft,
The center station measures the position and altitude of the aircraft based on position information of the plurality of receiving stations and reception time difference information when the signals are received by the plurality of receiving stations,
The signal includes a plurality of types of signals and has a specific transmission pattern by a combination of the plurality of types of signals.
In a signal type determination method applied to an aircraft position measurement system,
Storing the transmission pattern information;
After receiving all the signals as the same type of signals, determining the type of the signal based on the information of the transmission pattern stored by the processing of the storing step;
A signal type determination method characterized by comprising: The transmission pattern is a transmission pattern in which a signal of type n is continuously transmitted q times after a signal of type m is continuously transmitted p times.
As the process of determining the type of the signal, it is determined that the received signal of the same type continued q times following the received signal of the same type continued p times is a signal of type n.
6. The signal type determination method according to claim 5, wherein: The signal includes identification information given to the aircraft for each flight plan,
Receiving an aircraft monitoring report from an airway monitoring radar station that monitors an airspace in common with the receiving area of the receiving station;
Searching for identification information that matches the identification information included in the signal received by the receiving station from the received aircraft monitoring report;
Determining the signal received by the receiving station as a highly reliable signal when the matching identification information is retrieved by the process of retrieving the identification information;
The signal type determination method according to claim 6, further comprising: Comparing the altitude information reported from the aircraft with the altitude information measured for the aircraft based on the identification information of the aircraft;
When the reported altitude information differs from the measured altitude information based on the comparison result of the comparing step, the step of correcting the reported altitude information with the measured altitude information;
8. The signal type determination method according to claim 5, wherein the signal type determination method comprises: Means for measuring the position and altitude of the aircraft based on the position information of a plurality of receiving stations whose position information has been determined and the reception time difference information when signals transmitted from one aircraft are respectively received by the plurality of receiving stations. In the center station equipped with
The signal includes a plurality of types of signals, and has a specific transmission pattern based on a combination of the plurality of types of signals.
Transmission pattern storage means for storing information of the transmission pattern;
After all the signals are regarded as being of the same type and received, signal type determination means for determining the type of signal based on the transmission pattern information stored in the transmission pattern storage means,
A center station comprising: The transmission pattern is a transmission pattern in which a signal of type n is continuously transmitted q times after a signal of type m is continuously transmitted p times.
The signal type determination means includes means for determining that a reception signal of the same type continued q times following the reception signal of the same type continued p times as a signal of type n.
The center station according to claim 9. The signal includes identification information given to the aircraft for each flight plan,
Monitoring report receiving means for receiving an aircraft monitoring report from an airway monitoring radar station that monitors an airspace common to the receiving area of the receiving station;
Identification information search means for searching for identification information that matches the identification information included in the signal received by the receiving station from the aircraft monitoring report received by the monitoring report receiving means;
A reliability determination unit that determines the signal received by the receiving station as a highly reliable signal when the matching identification information is searched by the identification information search unit;
The center station according to claim 10, comprising: Means for comparing altitude information reported from an aircraft with altitude information measured by the means for measuring the aircraft as a measurement object based on identification information of the aircraft;
When the reported altitude information is different from the measured altitude information based on the comparison result of the means for comparing, means for correcting the reported altitude information with the measured altitude information;
The center station according to claim 9, further comprising: By installing on the information processing device,
A function for measuring the position and altitude of the aircraft based on the position information of a plurality of receiving stations whose position information has been determined and the reception time difference information when signals transmitted from one aircraft are respectively received by the plurality of receiving stations. In the program that realizes the function of the center station with
The signal includes a plurality of types of signals, and has a specific transmission pattern based on a combination of the plurality of types of signals.
A transmission pattern storage function for storing the transmission pattern information;
A signal type determination function for determining the type of signal based on the transmission pattern information stored in the transmission pattern storage function after receiving all the signals as the same type of signal,
A program characterized by realizing. The transmission pattern is a transmission pattern in which a signal of type n is continuously transmitted q times after a signal of type m is continuously transmitted p times.
As the signal type determination function, a function of determining a received signal of the same type continued q times following the received signal of the same type p consecutive times as a signal of type n is realized.
The program according to claim 13. The signal includes identification information given to the aircraft for each flight plan,
A monitoring report receiving function for receiving an aircraft monitoring report from an airway monitoring radar station that monitors an airspace in common with the receiving area of the receiving station;
An identification information search function for searching for identification information that matches the identification information included in the signal received by the receiving station from the aircraft monitoring report received by the monitoring report reception function;
A reliability determination function for determining the signal received by the receiving station as a highly reliable signal when the matching identification information is searched by the identification information search function;
15. The program according to claim 14, wherein the program is realized. A function for comparing altitude information reported from an aircraft with altitude information measured by the function of measuring the aircraft as a measurement object based on the identification information of the aircraft;
When the reported altitude information differs from the measured altitude information based on the comparison result of the function to be compared, a function of correcting the reported altitude information with the measured altitude information;
The program according to any one of claims 13 to 15, wherein the program is realized.

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