JP5858733B2 - Secondary surveillance radar - Google Patents

Description

  The present invention relates to a secondary monitoring radar that uses an extended squitter received from an aircraft.

  Secondary Surveillance Radar (SSR) is installed in the ground station, transmits a question signal to the transponder installed in the aircraft, and receives a response signal transmitted from the aircraft transponder in response to this question signal. To do. The secondary monitoring radar acquires information necessary for air traffic control by transmitting and receiving such signals.

  There are two types of transponders installed in aircraft: ATCRBS transponders that have been used conventionally and Mode S transponders developed after the ATCRBS transponders, and the signals that are transmitted and received are different.

  In the mode S secondary monitoring radar corresponding to both the ATCRBS transponder and the mode S transponder, the ATCRBS machine equipped with the ATCRBS transponder and the mode S machine equipped with the mode S transponder are captured. The process is divided into an all-call period and a roll-call period. Specifically, the mode S secondary monitoring radar transmits a collective question during the all call period to capture the ATCRBS machine and the mode S machine, and transmits an individual question during the roll call period to the all call period. By continuing the capture of the Mode S aircraft captured in the above, processing is performed so that all aircraft in the monitored airspace can be captured (see, for example, Patent Document 1 and Non-Patent Document 1).

  However, in Mode S secondary monitoring radar, it is difficult to capture all aircraft in the monitored airspace due to problems such as the occurrence of garble due to the increase in the number of aircraft in the monitored airspace, the type and status of the transponders mounted on the aircraft, the radio wave environment, It is important to use each period efficiently.

JP 2010-266350 A

Michael C. Stevens “Secondary Surveillance Radar” 1988, ISBN 0-89006-292-7

  As described above, in the conventional mode S secondary monitoring radar, when there are a large number of aircraft in the monitored airspace, it is difficult to capture all the aircraft depending on the type and situation of the transponder mounted on the aircraft and the radio wave environment.

  Accordingly, the present invention provides a secondary monitoring radar with improved aircraft monitoring performance.

The mode S secondary monitoring radar according to the feature of the present invention receives the response transmitted from the aircraft in response to the transmitted question, monitors the flight of the aircraft, and monitors the aircraft in all directions by the received signal based on the Ω pattern. The detection unit includes a storage unit, a registration unit, a monitoring processing unit, and a determination unit. The storage unit stores a list of mode S addresses of aircrafts to which questions are transmitted. When the registration means receives the response transmitted from the aircraft in response to the question, when the mode S address included in the received response is not included in the list stored in the storage unit, the storage unit stores the mode S address. Register to the list to remember. When receiving the response transmitted from the aircraft in response to the question, the monitoring processing means monitors the aircraft using the processing result of the received response. When the determination unit receives a signal other than the response transmitted from the aircraft, the determination unit determines whether the mode S address included in the signal is included in the list stored in the storage unit, and the determination unit determines whether the mode S address is included in the list. Outputs the signal analysis result.

It is a functional block diagram explaining the structure of the mode S secondary monitoring radar which concerns on the best embodiment of this invention. It is a figure explaining a part of structure of the mode S secondary monitoring radar shown in FIG. It is a figure explaining the signal which a general mode S secondary surveillance radar receives. It is a figure explaining the process in the mode S secondary surveillance radar shown in FIG.

  A mode S secondary monitoring radar 1 according to the preferred embodiment of the present invention will be described with reference to FIG. The mode S secondary monitoring radar 1 is installed in the ground station, and monitors the aircraft based on a question response with a transponder provided in the aircraft.

  As shown in FIG. 1, a mode S secondary monitoring radar 1 according to the best embodiment of the present invention is connected to an antenna 11, a transmission / reception unit 12 that transmits and receives signals via the antenna 11, and a transmission / reception unit 12. And a signal processing unit 13 that controls the question response and generates and outputs a target report based on the received response.

  The transmission / reception unit 12 includes a transmission / reception switch 121 that switches transmission / reception of a signal, a transmitter 122 that transmits a signal, and a receiver 123 that receives a signal. The transmission / reception unit 12 transmits a question via the antenna 11 and receives it through the antenna 11. The response is output to the signal processing unit 13.

  In addition, the signal processing unit 13 includes a transmission control unit 131 that controls transmission control of a question, a channel management unit 132 that schedules an all call period and a roll call period, and a mode S response that processes a mode S response received from a mode S machine. The processing unit 133 includes an extended squitter processing unit 134 that processes the received extended squitter, an ATCRBS response processing unit 135 that processes an ATCRBS response received from the mode S machine, and a monitoring processing unit 136 that generates a target report using the response. ing.

  The extended squitter is a signal used in broadcast-type automatic dependent monitoring (ADS-B), and is transmitted and received between aircrafts having transponders corresponding to ADS-B. This extended squitter contains information about parity, such as transponder capabilities, mode S address, aircraft position and speed. That is, the mode S secondary monitoring radar 1 according to the embodiment includes the extended squitter processing unit 134, analyzes an extended squitter that is not processed by a general mode S secondary monitoring radar, and uses information included in the extended squitter. be able to.

  As shown in FIG. 2, the receiver 123 detects a Σ video from the received signal, a Σ video detector 123 a that detects Σ video, a binarization unit 123 b that binarizes the detected Σ video, and detects Δ video from the received signal. A Δ video detector 123c, a binarizing means 123d for binarizing the detected Δ video, an Ω video detector 123e for detecting the Ω video from the received signal, and a binary value for binarizing the detected Ω video. And a conversion means 123f. Each binarization means 123b, 123d, 123f of the receiver 123 outputs the binarized video to the mode S response processing unit 133 and the ATCRBS response processing unit 135.

  As shown in FIG. 3, the mode S secondary monitoring radar 1 detects an aircraft within the beam width (generally about 2.5 to 3 degrees in SSR) from three video patterns of Σ, Δ, and Ω. Execute code analysis and angle measurement of response signal. In the mode S secondary surveillance radar 1, response code analysis and angle measurement are performed from the Σ and Δ video patterns, and whether or not the aircraft is within the beam width is determined by receiving the Σ, Δ, and Ω video patterns. Compare signal strength.

  As shown in FIG. 2, the mode S response processing unit 133 inputs Σ video, Δ video, and Ω video from the receiver 123, and responds to the interrogation signal transmitted by the transmitter 122 from the aircraft (mode S machine). Mode S response detection means 133a for detecting the transmitted mode S response, and mode S response analysis means 133b for analyzing the mode S response detected by the mode S response detection means 133a and outputting the analysis result to the monitoring processing unit 136 And. Here, since the question response is executed in a specific direction, the mode S response processing unit 133 uses only a signal that satisfies the conditions of Σ> Δ and Σ> Ω.

  As shown in FIG. 2, the ATCRBS response processing unit 135 inputs Σ video, Δ video, and Ω video from the receiver 123, and is transmitted from the aircraft (ATCRBS machine) in response to the interrogation signal transmitted by the transmitter 122. ATCRBS detection means 135a for detecting the ATCRBS response, and ATCRBS response analysis means 135b for analyzing the ATCRBS response detected by the ATCRBS detection means 135a and outputting the analysis result to the monitoring processing unit 136. The ATCRBS response processing unit 135 also uses only signals that satisfy the conditions of Σ> Δ and Σ> Ω.

  As shown in FIG. 2, the monitoring processing unit 136 uses the analysis result of the response signal to generate the target report generating unit 136a and the data regarding the mode S machine (target) to be monitored during the roll call period. A registration unit 136b for registration and a storage unit 136c for storing a list of mode S machines registered in the registration unit 136b are provided. Specifically, the list stored in the storage unit 136c includes the mode S address of the mode S machine that is the target of the question response in the roll call period by the mode S response received in the all call period. Yes.

  The transmission control unit 131 transmits a question to the aircraft of the mode S address included in the list stored in the storage unit 136c during the roll call period. In the roll call period, for the aircraft that does not receive a response for a predetermined period (for example, a period of two scans) even if a question is transmitted, the registration unit 136b excludes the response from the question response target in the roll call period. Clear the aircraft mode S address from the list.

  As shown in FIG. 2, the extended squitter processing unit 134 receives the Ω video from the receiver 123 and detects the extended squitter transmitted from the aircraft, and the extended squitter detecting unit 134a detects the extended squitter detecting unit 134a. Whether or not the extended squitter analyzing unit 134b for analyzing the extended squitter and the mode S address included in the analysis result of the extended squitter analyzing unit 134b are included in the list stored in the storage unit 136c of the monitoring processing unit 136. Determination means 134c for determining.

  Here, as shown in FIG. 4, the mode S secondary monitoring radar 1 is divided into an all-call period in which collective question answering is performed and a roll call period in which individual question answering is performed, but the extended squitter is omnidirectional. Yes, since it can always be received, even for an aircraft that cannot be captured by the question answering, it is possible to receive the extended squitter and acquire information such as its position.

  Specifically, the extended squitter analyzing unit 134b decodes the data block of the extended squitter detected by the extended squitter detecting unit 134a, and outputs the result to the determining unit 134c. Since the value of the PI field of the extended squitter is “0”, the extended squitter analysis unit 134b has the value of the PI field of “0” and the value of the DF field of “10001” (DF = 17) as a result of decoding. ) Or “10010” (DF = 18) only when it is output to the determination means 134c.

  The determination unit 134c refers to the list stored in the storage unit 136c of the monitoring processing unit 136 at a predetermined timing, and whether the mode S address included in the analysis result input from the extended squitter analysis unit 134b is included in the list. Determine whether. In addition, when the mode S address included in the analysis result is not included in the list of the storage unit 136c, the determination unit 134c outputs the analysis result input from the extended squitter analysis unit 134b.

  The analysis result of the extended squitter output from the extended squitter processing unit 134 is input to, for example, the target report generating unit 136a and used for generating the target report. Alternatively, it is stored in a storage device (not shown) as monitoring information and used later, or displayed and used on a display device (not shown).

  As described above, in the mode S secondary monitoring radar 1, for example, conventionally, (1) an aircraft that could not be detected correctly because the response signal was garbled (overlapped) in the all-call period, and (2) the all-call period (3) an aircraft that could not be detected due to a question-response sequence problem (for example, a transponder that cannot recognize a question, a question signal that cannot be recognized by a transponder, a transponder that does not respond to a question, a response signal that cannot be recognized by a secondary monitoring radar) ) An aircraft that could not be detected, such as an aircraft that could not be detected due to poor radio wave environment, can be detected using an extended squitter.

  Therefore, the target report and the monitoring information generated by the mode S secondary monitoring radar 1 can grasp the aircraft information that cannot be grasped by the conventional mode S secondary monitoring radar. In other words, the mode S secondary monitoring radar 1 can detect an undetected aircraft, and using this detection, for example, the detected aircraft can be added to a new capture target.

  In the above example, the extended squitter processing unit 134 detects and processes the extended squitter by inputting a non-directional Ω video signal, but the mode S secondary monitoring radar 1 uses it for question answering. When an omnidirectional antenna is provided separately from the antenna 11, the extended squitter processing unit 134 may detect and process an extended squitter from a signal received by a nondirectional antenna different from the antenna 11. .

  As described above, according to the mode S secondary monitoring radar 1 according to the embodiment, in addition to the information included in the ATCRBS response and the mode S response, the extended squitter can be received and used. Therefore, the mode S secondary monitoring radar 1 can improve the aircraft monitoring performance by using the extended squitter.

DESCRIPTION OF SYMBOLS 1 ... Mode S secondary monitoring radar 11 ... Antenna 12 ... Transmission / reception part 121 ... Transmission / reception switch 122 ... Transmitter 123 ... Receiver 13 ... Signal processing part 131 ... Transmission control part 132 ... Channel management part 133 ... Mode S response processing part 133a ... Mode S response detection means 133b ... Mode S response analysis means 134 ... Extended squitter processing section 134a ... Extended squitter detection means 134b ... Extended squitter analysis means 134c ... Determination means 135 ... ATCRBS response processing section 135a ... ATCRBS detection means 135b ... ATCRBS Response analysis unit 136... Monitoring processing unit (monitoring processing unit)
136a ... target report generation means 136b ... registration means 136c ... storage unit (storage means)

Claims (1)

A mode S secondary monitoring radar that transmits a question, receives a response transmitted from the aircraft in response to the transmitted question, monitors the flight of the aircraft, and detects the aircraft in all directions by a received signal with an Ω pattern There,
Storage means for storing a list of mode S addresses of aircraft to which questions are transmitted;
When a response transmitted from the aircraft to the question is received, when the mode S address included in the received response is not included in the list stored in the storage unit, the storage unit stores the mode S address. Registration means for registering in the list;
Upon receiving a response sent from the aircraft to the question, a monitoring processing means for monitoring the aircraft using the processing result of the received response;
When a signal other than the response transmitted from the aircraft is received, it is determined whether or not the mode S address included in the signal is included in the list stored in the storage unit, and the signal is analyzed according to the determination result. A determination means for outputting a result;
A secondary surveillance radar comprising:

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