JP5513993B2 - Secondary surveillance radar - Google Patents

Description

  Embodiments described herein relate generally to a secondary monitoring radar used for monitoring flight of an aircraft.

  A radar device such as a Mode S secondary surveillance radar (SSR mode S: Secondary Surveillance Radar Mode S) is used to monitor the flight of the aircraft. As shown in FIG. 5, the mode S secondary monitoring radar 1a transmits an interrogation signal to the transponder 20 mounted on the aircraft 2, receives a response signal transmitted from the transponder 20, analyzes it, and monitors the aircraft. To do.

  The transponder includes a mode S transponder and an ATCRBS transponder that are different in processing and transmission / reception signals. Therefore, the mode S secondary monitoring radar 1a sets the all call period and the roll call period, and monitors the aircraft including each transponder. Specifically, during the all call period, a mode S collective question for an aircraft equipped with a mode S transponder and an ATCRBS collective question for an aircraft equipped with an ATCRBS transponder are transmitted and a response to each question is received. Further, the mode S secondary monitoring radar 1a transmits the mode S individual question to the aircraft equipped with the mode S transponder captured in the all call period during the roll call period, and receives a response to the question.

  For example, as shown in FIG. 6, the mode S secondary monitoring radar 1a may receive a plurality of responses including the same mode S address during the all-call period of the same scan when there is a reflector that reflects the signal. is there. In addition, a response including the mode S address of the aircraft captured in the roll call period may be received in the all call period. When such multiple detection occurs, the mode S secondary monitoring radar 1a does not unconditionally shift the aircraft of the mode S address that has been multiple detected to roll call regardless of the cause. Also, when a response including the same mode S address as that of the aircraft to be captured during the roll call period is received, the aircraft is excluded from being captured during the roll call period of the aircraft that is continuing the roll call.

  Therefore, as shown in FIG. 6, even when the response from the real aircraft is received as in the case of receiving the response R1 transmitted from the real aircraft 2 and the response R2 which is a reflected signal, multiple detection has occurred. In some cases, the capture during the roll call period is not performed, and the capture must be performed during the all call period.

  However, because there is a limit to the number of aircraft that can be processed during the all-call period, if an aircraft equipped with a mode S transponder is acquired during the all-call period due to multiple detection, the acquisition is performed during the all-call period. There is a risk of reducing the detection rate of aircraft equipped with the continuing ATCRBS transponder and the detection rate of new aircraft.

Michael C. Stevens “Secondary Surveillance Radar” 1998, ISBN 0-89006-292-7

  As described above, when an aircraft equipped with a mode S transponder is captured during an all-call period due to multiple detection, the detection rate of an aircraft equipped with an ATCRBS transponder or a new aircraft may be reduced.

  Therefore, according to the embodiment, a secondary surveillance radar is provided that prevents a decrease in the detection rate of other aircraft due to multiple detection of Mode S responses.

  The secondary monitoring radar of the embodiment transmits an interrogation signal to the aircraft flying in the monitored airspace at a time during the all call period, and to the aircraft registered as the acquisition target in the roll call acquisition target list during the roll call period. A secondary means for individually monitoring the flight of the aircraft using the received response signal, comprising: a transmitting means for individually transmitting the interrogation signal; and a receiving means for receiving a response signal transmitted from the aircraft in response to the interrogation signal. A candidate that is a surveillance radar and includes a mode S address of a candidate aircraft that is a candidate for acquisition during the roll call period and a correlation range that identifies a timing at which the candidate aircraft may receive a response signal in the next scan A candidate aircraft list storage unit for storing a aircraft list, and a mode S address of an aircraft included in a response signal received by the receiving unit during an all-call period, The address determination means for determining whether or not the mode S address of the candidate aircraft included in the aircraft matches the mode S address of the aircraft, and the address determination means determines that the mode S address of the aircraft included in the response signal matches the mode S address of the candidate aircraft. Then, a correlation determination unit that determines whether the reception timing of the response signal is included in the correlation range associated with the mode S address of the candidate aircraft in the candidate aircraft list, and the correlation determination unit And updating means for adding the mode S address of the aircraft and updating the roll call capture target list when it is determined that the reception timing is included in the correlation range.

It is a functional block diagram explaining the structure of the mode S secondary monitoring radar which concerns on embodiment. It is a figure explaining the period utilized by the process of the mode S secondary monitoring radar of FIG. It is a flowchart explaining the process in the mode S secondary monitoring radar of FIG. It is a figure explaining reception of the response in the mode S secondary surveillance radar of FIG. It is the schematic showing a general mode S secondary surveillance radar and a transponder. It is a figure explaining reception of the response in the mode S secondary surveillance radar of FIG.

  The mode S secondary monitoring radar 1 according to the embodiment will be described with reference to FIG. The mode S secondary monitoring radar 1 is a device that is installed in a ground station and monitors the flight of an aircraft based on a question answer with a transponder provided in the aircraft.

  As shown in FIG. 1, the mode S secondary monitoring radar 1 is connected to an antenna 11, a transmission / reception unit 12 that transmits / receives a signal via the antenna 11, and a transmission / reception unit 12, and controls and receives a response to a question. And a signal processing unit 13 for generating and outputting a target report.

  The transmission / reception unit 12 includes a transmission / reception switch 121, a transmitter 122, and a receiver 123. The transmission / reception unit 12 transmits a question (question signal) via the antenna 11, and receives a response (response signal) received by the antenna 11 as a signal processing unit. 13 is output.

  In addition, the signal processing unit 13 receives the transmission control unit 131 that controls the transmission control of the question, the mode S response processing unit 132 that processes the mode S response received from the aircraft including the mode S transponder, and the aircraft that includes the ATCRBS transponder. An ATCRBS response processing unit 133 that processes an ATCRBS response, a channel management unit 134 that schedules an all call period and a roll call period as shown in FIG. 2, and a monitoring processing unit 135 that generates a target report in response to the response. .

  The monitoring processing unit 135 includes a roll call capture target list storage unit 135g that stores a roll call capture target list related to aircraft information captured during the roll call period, and aircraft (candidate aircraft) that are candidates for capture during the roll call period. A candidate machine list storage unit 135h for storing a candidate machine list relating to information. In the mode S secondary monitoring radar 1, for example, when a response is received a predetermined number of times from the same aircraft (candidate aircraft) over a plurality of all-call periods, the roll call capture target list is acquired with the candidate aircraft being captured in the roll call period. Register with. In the mode S secondary monitoring radar 1, during the roll call period, a question answering schedule is set for the aircraft registered in the roll call capturing target list, the question is transmitted and the response is received.

  Further, the monitoring processing unit 135 decodes a response transmitted from the aircraft, and a report that generates a target report used for aircraft monitoring using the response decoded by the response processing unit 135a. Correlation between generation unit 135b, address determination unit 135c for determining whether or not the mode S response received during the all-call period is transmitted from the candidate machine, and the mode S response received in the past when the mode S response is received Correlation determining means 135d for determining the range, correlation processing means 135e for determining the correlation range for the received Mode S response, and updating means 135f for updating the roll call capture target list and candidate machine list.

  Here, in order to explain the processing of the mode S response received in the all call period and the configuration necessary for these processes according to the present embodiment, it is used for other processes executed in the roll call period and these processes. The configuration and the like are omitted.

  When the response processing unit 135a receives a response from the mode S response processing unit 132 or the ATCRBS response processing unit 133, the response processing unit 135a decodes the input response and outputs the decoded result data to the report generation unit 135b. Further, when the response is a mode S response transmitted from the mode S transponder, the response processing unit 135a also outputs the decoding result of the mode S response to the address determination unit 135c. This mode S response includes a mode S address, which is an identifier of the aircraft, and aircraft position information.

  The report generation unit 135b generates a target report using data input from the response processing unit 135a. For example, the target report is data including the mode S address, the time, the position information of the flight position at that time, the response reception time (reception timing), and the like.

  When the address determination unit 135c inputs the decoding result of the mode S response newly received from the response processing unit 135a during the all-call period, the address determination unit 135c reads the candidate aircraft list stored in the candidate aircraft list storage unit 135h and inputs the decoding result It is determined whether the mode S address included in is included in the candidate aircraft list.

  In the candidate aircraft list, the mode S response is received together with the mode S address and position information included in the decoding result of the mode S response, which is a response to the all call collective question transmitted during the past all call period, and the reception timing of the mode S address. Is the data including the correlation range obtained based on the reception timing. This correlation range is obtained as a range based on the beam dwell time as a range of timing at which a response from the same aircraft can be received in the next scan with respect to a reception timing at which a response is received in a certain scan. This is stored in the list storage unit 135h. Here, the beam dwell time is a time allocated from the beam width and the antenna rotation angle, and as shown in FIG. 2, is formed with a plurality of periods in which the all-call period and the roll call period are one period. It is.

  Since the aircraft is moving, the timing of receiving a response is different for each scan. However, since the speed of movement of the aircraft is limited, the range of timing for receiving a response in the next scan can be predicted. Therefore, in the mode S secondary monitoring radar 1 according to the present embodiment, a range predicted to receive a response in the next scan is stored as a correlation range, and the suitability of the response is determined using the correlation range.

  If the address determination unit 135c determines that the mode S address included in the decoding result of the input response is included in the candidate machine list, the address determination unit 135c sends the decoding result to the correlation determination unit 135d in order to determine whether it is within the correlation range. Output. On the other hand, if the address determination unit 135c determines that the mode S address included in the input response decoding result is not included in the candidate machine list, the address determination unit 135c outputs the response decoding result to the correlation processing unit 135e as a new target.

  The correlation determination unit 135d determines whether or not the reception timing of the response included in the decoding result of the input response is within the correlation range of the candidate aircraft list input together with the decoding result. If the correlation determination unit 135d determines that the response is within the correlation range, the response received in the previous scan and the response received in the current scan are determined to be transmitted from the same aircraft. The decoding result is output to the updating unit 135f. On the other hand, if the correlation determination unit 135d determines that the response does not exist within the correlation range, the response received in the previous scan and the response received in the current scan are identified as not being transmitted from the same aircraft. Then, the decoding result is output to the correlation processing means 135e.

  The correlation determination unit 135d determines that the response is an accurate response from the same aircraft when a response is received within the correlation range set in the previous scan. However, in order to improve the accuracy of judgment, the response is sent from the same aircraft when a response sent from the same aircraft within the correlation range set in the previous scan can be received over multiple scans. It can also be determined that the response has been made.

  The correlation processing means 135e obtains a correlation range stored in the candidate aircraft list for the aircraft that has received the response. Specifically, when the correlation processing unit 135e receives the decoding result of the response from the address determination unit 135c or the correlation determination unit 135d, the correlation processing unit 135e receives the response from the reception timing of the response included in the input composite result from the aircraft that transmitted the response. Timing predicted to receive a response to the scan is calculated as a correlation range. Thereafter, the correlation processing unit 135e outputs the calculated correlation range together with the input composite result to the updating unit 135f.

  When receiving the decoding result of the response from the correlation determining unit 135d, the updating unit 135f updates the roll call capture target list by adding data included in the decoding result, and deletes the data related to the corresponding aircraft and cancels the candidate aircraft. Update the list. That is, since it is necessary to store the data of the previous scan regarding the candidate aircraft in the candidate aircraft list, the candidate aircraft is deleted when it becomes a roll call capture target. Further, since only the data related to the aircraft to be captured during the roll call period is stored in the roll call capture target list, the list is deleted when the roll call capture target list is no longer the target of capture during the roll call period. For example, when the corresponding aircraft no longer exists in the monitoring range of the mode S secondary monitoring radar 1, the data of this aircraft is deleted.

  Further, when receiving the response decoding result and the correlation range from the correlation processing unit 135e, the updating unit 135f adds the data and the correlation range included in the decoding result and updates the candidate machine list. That is, since it is necessary to store the data of the previous scan related to the candidate aircraft in the candidate aircraft list, when a new candidate aircraft is detected, the data related to this aircraft is added.

  Next, the flow of processing when the mode S secondary monitoring radar 1 receives the mode S response during the all-call period will be described using the flowchart shown in FIG.

  In the mode S secondary monitoring radar 1, the response processing unit 135a inputs the response decoded from the mode S response processing unit 132 (S11). The response processing unit 135a outputs the input response to the report generation unit 135b and the address determination unit 135c.

  The address determination unit 135c that has input the response from the response processing unit 135a compares the mode S address of this response with the mode S address included in the candidate machine list, and the input response is registered in the candidate machine list. It is determined whether or not it has been transmitted from the machine (S12).

  If the address determination unit 135c determines that the response is not transmitted from the candidate aircraft (NO in S12), the correlation processing unit 135e calculates the correlation range of this aircraft using the input reception timing. (S13). Thereafter, the updating unit 135f updates the candidate aircraft list by adding the data included in the response and the obtained correlation range (S14).

  On the other hand, if it is determined by the address determination unit 135c that the response is transmitted from the candidate machine (YES in S12), the correlation determination unit 135d calculates the input reception timing and the correlation range included in the candidate machine list. In comparison, it is determined whether the reception timing of this response is within the correlation range (S15).

  When the correlation determination unit 135d determines that the reception timing is within the correlation range (YES in S15), the position information received from the candidate aircraft in the past and the newly received position information are within the predetermined correlation range (S16). The update unit 135f updates the roll call capture target list by adding the aircraft data, and deletes the aircraft data to obtain the candidate aircraft list. March (S17).

  On the other hand, if the correlation determination unit 135d determines that it is not within the correlation range (NO in S15), the aircraft is handled as a candidate aircraft without being subjected to a roll call. The correlation range is calculated (S13) and added to the candidate aircraft list by the updating means 135f (S14).

  Even if the correlation determination unit 135d determines that the reception timing is within the correlation range (YES in S15), the position information received from the candidate aircraft in the past and the newly received position information are outside the predetermined correlation range. In some cases (NO in S16), the list is not updated.

  For example, in the example shown in FIG. 4, the response R1 transmitted by the mode S transponder of the aircraft 2 is received by the mode S secondary monitoring radar 1, and the response R2 in which the response R1 is reflected by the reflector is also the mode S secondary monitoring. It is assumed that the signal is received by the radar 1. Since the response R1 and the response R2 are transmitted from the same aircraft, they include the same mode S address. Conventionally, when a plurality of responses having the same mode S address are received in this way, all responses are excluded from candidates. On the other hand, in the case of the secondary monitoring radar 1 described above, data relating to the response R1 and the response R2 are stored in the candidate aircraft list together with the correlation range.

  Even in the subsequent scan, if the mode S secondary monitoring radar 1 transmits a question (mode S batch question) during the all-call period, a response is transmitted from the aircraft 2, but since the position of the aircraft 2 moves, it is reflected by the reflector. Disappear. Therefore, in the subsequent scans, even if the response can be received within the correlation range set for the response R1 having the same mode S address, the response cannot be received within the correlation range set for the response R2. Therefore, the mode S address is stored together with the correlation range, and when it is received within the correlation range from the next time onward, it is shifted to the capture target in the roll call period, so that the actual aircraft is reliably captured in the roll call period. It can be.

  Also, even if the response R2 reflected in the next scan is received and registered as a capture target in the roll call period, the response to the question transmitted because there is no aircraft existing in the registered direction in the roll call period. The response to this subject is discontinued because no Therefore, there is no problem of continuing setting of an unnecessary question answering period during the roll call period.

  According to the mode S secondary monitoring radar 1 described above, even in the case of the same mode S address multiple detection, the data obtained by the response is not used, but a correlation range is set and stored as another target. It can be used for determination in the next and subsequent scans and can be reliably transferred to a roll call. Therefore, since the number of aircraft equipped with the mode S transponder captured during the all-call period can be reduced, it is possible to prevent the aircraft equipped with the mode S transponder from being excluded from monitoring and to detect the ATCRBS transponder. It is possible to prevent a reduction in the rate and a reduction in the detection rate of new aircraft during the all-call period.

DESCRIPTION OF SYMBOLS 1 ... 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 ... Response processing part 133 ... ATCRBS response processing part 134 ... Channel Management unit 135 ... monitoring processing unit 135a ... response processing unit 135b ... report generation unit 135c ... address determination unit 135d ... correlation determination unit 135e ... correlation processing unit 135f ... update unit 135g ... roll call capture target list storage unit 135h ... candidate machine list Memory

Claims (3)

Transmitting means for transmitting interrogation signals to the aircraft flying in the monitored airspace in an all-call period at a time, and individually transmitting interrogation signals to the aircraft registered as an acquisition target in the roll call acquisition target list in the roll call period And a receiving means for receiving a response signal transmitted from the aircraft in response to the interrogation signal, and a secondary monitoring radar for monitoring the flight of the aircraft using the received response signal,
Candidate for storing a candidate aircraft list including a mode S address of a candidate aircraft that is a candidate for acquisition during the roll call period and a correlation range that identifies a timing at which a response signal may be received from the candidate aircraft in the next scan A machine list storage unit;
An address determination means for determining whether or not a mode S address of an aircraft included in a response signal received by the reception means during an all-call period matches a mode S address of a candidate aircraft included in the candidate aircraft list;
When it is determined by the address determination means that the aircraft mode S address included in the response signal matches the mode S address of the candidate aircraft, the reception timing of the response signal is determined as the mode S address of the candidate aircraft in the candidate aircraft list. Correlation determination means for determining whether or not the correlation range is included in the correlation range associated with
When the correlation determination unit determines that the response signal reception timing is included in the correlation range, an update unit that adds the mode S address of the aircraft and updates the roll call capture target list;
A secondary surveillance radar comprising: If it is determined by the address determination means that the mode S address of the aircraft included in the response signal does not match the mode S address of the candidate aircraft, the response signal is received from the aircraft for the next scan using the reception timing of the response signal. A correlation processing means for obtaining a correlation range that is expected to be received;
2. The secondary monitoring according to claim 1, wherein the updating unit updates the candidate aircraft list by associating an aircraft mode S address with the correlation range obtained by the correlation processing unit for the aircraft. Radar. When the correlation determination unit determines that the response signal reception timing is not included in the correlation range, the correlation processing unit obtains a new correlation range using the response signal reception timing,
The update means updates the candidate aircraft list by associating the aircraft mode S address with the new correlation range obtained by the correlation processing means for the aircraft. Next monitoring radar.

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