JP5214159B2 - Mode S secondary monitoring radar - Google Patents

Description

  The present invention relates to a mode S secondary monitoring radar that monitors an aircraft flying in a monitored airspace.

  A ground station mode S secondary monitoring radar (SSR mode S) 1 is installed as a control facility at a major point of an airport or an air route. As shown in FIG. 11, the mode S secondary monitoring radar 1 includes an antenna 11, a transmission / reception unit 12, and a processing unit 14, and transmits a question via the transmission / reception unit 12 and the antenna 11 under the control of the processing unit 14. When the question transmitted from the mode S secondary monitoring radar 1 is received via the antenna 21 and the transmission / reception unit 22 of the transponder 2 mounted on the aircraft, the signal processing unit 23 controls the transmission via the transmission / reception unit 22 and the antenna 21. The response from the aircraft is sent. Using the data included in the response received from the aircraft, the aircraft flying in the corresponding monitored airspace is monitored (for example, see Non-Patent Document 1).

  The mode S secondary monitoring radar 1 and the transponder 2 are configured according to a standard as described in Non-Patent Document 1, and there are two types of transponders 2, an ATCRBS transponder and a mode S transponder. Further, the mode S secondary monitoring radar 1 receives a response as shown in FIG. 12 from each transponder in response to the question to be transmitted.

  When the Mode S secondary monitoring radar 1 transmits the mode A / C question Q1, it receives the ATCRBS response Aa1 from the aircraft equipped with the ATCRBS transponder (ATCRBS aircraft), and the aircraft equipped with the Mode S transponder (Mode S aircraft) ATCRBS response Ab1 is received from. The mode S secondary monitoring radar 1 receives the ATCRBS response Aa2 from the ATCRBS machine when the mode A / C dedicated question Q2 is transmitted, but there is no response from the mode S machine.

Further, when the mode S secondary monitoring radar 1 transmits the mode S all call question Q3, it receives the mode S all call response Ab2 from the mode S machine, but there is no response from the ATCRBS machine. In the mode S secondary monitoring radar 1, an all call period and a roll call period are set and the aircraft is monitored. These questions Q1, Q2, and Q3 are transmitted during the all call period. Further, during the roll call period, the mode S secondary monitoring radar 1 transmits the mode S roll call question Q4 to each registered mode S machine, and the mode S from each mode S machine that has received this question Q4. The roll call response Ab3 is received.
ICAO, "INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES AERONAUTICAL TELECOMMUNICATIONS ANNEX 10", July 1998

  Conventionally, when the mode S transponder installed on the mode S machine is a bad mode S transponder, it should be sent to the mode S question (mode S all call question, mode S roll call question). S response (mode S all call response, mode S roll call response) might not be sent.

  In addition, the Mode S secondary monitoring radar 1 may not be able to receive the Mode S response transmitted in response to the Mode S question from the aircraft on which the Mode S transponder is mounted due to problems such as a narrow response pulse width. there were.

  Thus, conventionally, even when a mode S question is transmitted from the mode S secondary monitoring radar 1, a mode S response may not be received from the mode S aircraft. If the mode S response cannot be received from the mode S aircraft, the mode S aircraft flying in the surveillance airspace cannot be captured, and the mode S secondary monitoring radar 1 cannot fly the aircraft safely. Arise.

  In view of the above problems, the present invention receives a response from an aircraft (transponder) existing in the monitored airspace, accurately captures the aircraft present in the monitored airspace, and allows the aircraft to fly safely. The purpose is to provide the next monitoring radar.

  Mode S secondary monitoring radar according to the feature of the present invention transmits a question, and mode S monitors an ATCRBS machine equipped with an ATCRBS transponder existing in a predetermined surveillance airspace and a mode S machine equipped with a mode S transponder. A secondary monitoring radar that correlates transmission control means for transmitting questions, reception means for receiving responses transmitted from ATCRBS and Mode S machines, and positional information included in each received response. Correlation processing means to be obtained, classification means for classifying the received response, and determination means for determining whether the ATCRBS response received in response to the question is transmitted from the ATCRBS machine based on the results of the correlation processing and classification And generating means for generating a report on the status of the aircraft flying in the monitored airspace based on the determination result.

  According to the present invention, a mode S secondary monitoring radar that receives a response from an aircraft (transponder) existing in the monitored airspace, accurately captures the aircraft present in the monitored airspace, and makes the aircraft fly safely. Can be provided.

  The mode S secondary monitoring radar 1 according to the best embodiment of the present invention will be described below with reference to the drawings. A mode S secondary monitoring radar (SSR mode S) 1 according to the best embodiment of the present invention is installed in a ground station, and is connected to an antenna 11, a transmission / reception unit 12 connected to the antenna 11, and a transmission / reception unit 12. And a processing unit 13 incorporating a computer. As shown in FIG. 1, the antenna 11 is connected to a transmitter 122 and a receiver 123 via a transmission / reception switch 121 of the transmission / reception unit 12, and the transmitter 122 and the receiver 123 are connected to the processing unit 13. .

  As illustrated in FIG. 1, the processing unit 13 includes a transmission controller 131 connected to the transmitter 122, a mode S response processor 132 and an ATCRBS response processor 133 connected to the receiver 123, and a transmission controller 131. And a channel manager 134 connected to the mode S response processor 132, a transmission controller 131, a mode S response processor 132, an ATCRBS response processor 133, and a monitoring processor 135 connected to the channel manager 134, and processing. In order to control the entire system of the unit 13, a timing signal generator 136 is provided which forms and supplies the timing for system operation and question signal formation in the direction of the question to be transmitted.

  The transmitter 122 transmits the question via the transmission / reception switch 121 and the antenna 11 under the control of the processing unit 13. The receiver 123 receives a response transmitted in response to the question from the aircraft via the antenna 11 and the transmission / reception switch 121.

  The transmission control means 131 transmits the mode A / C question Q1 in the first all call period, transmits the mode S all call question Q3 and the mode A / C dedicated question Q2 in the second all call period, and in the roll call period. The mode S roll call question Q4 is transmitted to the aircraft equipped with the registered mode S transponder.

  In the mode S secondary monitoring radar 1 described with reference to FIG. 1, as shown in FIG. 2, the all-call period and the roll call period are alternately repeated. The second all-call period is repeated in a predetermined order.

  Here, the first all-call period is a period in which the mode A / C question Q1 is transmitted and the ATCRBS responses Ab1 and Aa1 transmitted from both the aircraft of the mode S aircraft and the ATCRBS aircraft are received. Here, the “ATCRBS response received during the first all-call period” is assumed to be the “first ATCRBS response”. During the second all-call period, mode S all-call question Q3 and mode A / C dedicated question Q2 are transmitted, and mode S all-call response Ab2 transmitted from the mode S machine is received and transmitted from the ATCRBS machine. This is a period for receiving the ATCRBS response Aa2. Here, the “ATCRBS response received during the second all-call period” is referred to as a “second ATCRBS response”. Further, the roll call period is a period for transmitting the mode S roll call question Q4 to the registered mode S machine and receiving the mode S roll call response Ab3 transmitted from the mode S machine.

  As shown in FIG. 1, the mode S response processor 132 includes a determination unit 132a and stores aircraft data 132b in a storage device in order to perform processing related to the input response. The aircraft data 132b includes an identifier of an aircraft that is a monitoring target by roll call. The determination unit 132a determines whether or not the input response is normal, and outputs the response to the monitoring processor 135 when the response is normal. Further, the determination unit 132a discards the response when the response is not normal. Specifically, when the response is a mode S all call response, the response is in an appropriate format, and when the own site ID assigned to the mode S secondary monitoring radar 1 matches the PI field included in the response, Determined to be normal. If the response is a mode S roll call response, the response is in a proper format, and if the predicted mode address matches the mode S address included in the response, it is determined to be normal. Here, the prediction mode address refers to an identifier of an aircraft included in the aircraft data 132b as a monitoring target by roll call.

  When the ATCRBS response processor 133 receives the ATCRBS response, the ATCRBS response processor 133 determines whether or not the input ATCRBS response is normal, and outputs the response to the monitoring processor 135 if it is normal. The ATCRBS response processor 133 discards the response when the response is not normal.

  The channel manager 134 schedules setting of a period for receiving a response in the all call period, setting of a period for transmitting a question in the roll call period, a period for receiving a response corresponding to each question, and the like.

  When the response received from the aircraft is input from the mode S response processor 132 or the ATCRBS response processor 133, the monitoring processor 135 outputs a detection report based on the input response, and the transmission controller 131 and the channel A control signal is output to the manager 134 to monitor the aircraft flying in the monitored airspace. As shown in FIG. 1, the monitoring processor 135 includes a correlation processing unit 135a, a classification unit 135b, a determination unit 135c, and a generation unit 135d to execute processing based on the response input from the mode S response processing unit 132. The prediction data 135e is stored in the storage device.

  The predicted data 135e is data associated with a predicted position, which is a position where each aircraft is scheduled to fly at each time.

  The correlation processing unit 135a obtains a correlation for the position information included in each received response. In the following, the correlation between the position information included in the first ATCRBS response and the position information included in the mode S all call response is referred to as “first correlation C1”, and the correlation between the position information included in the first ATCRBS response and the position information included in the second ATCRBS response is illustrated. The correlation between the “second correlation C2” and the position information included in the first ATCRBS response and the position information included in the mode S roll call response will be described as “third correlation C3”.

  The classifying unit 135b classifies (types) the first ATCRBS response into A type and B type. Specifically, when receiving the second ATCRBS response, the classification unit 135b classifies the first ATCRBS response as the A type when receiving the first ATCRBS response and the second ATCRBS response from the same aircraft. On the other hand, when only the first ATCRBS response is received and the second ATCRBS response is not received from the same aircraft, the classification unit 135b classifies the first ATCRBS response as the B type.

  The determination means 135c is based on the correlation obtained by the correlation processing means 135a, and whether the first ATCRBS response received for the mode A / C question is transmitted from the ATCRBS machine or transmitted from the mode S machine It is determined whether it is. Specifically, the determination unit 135c determines that the A type first ATCRBS response is transmitted from the ATCRBS machine. Further, the determination means 135c determines that the first ATCRBS response is transmitted from the ATCRBS machine when the first ATCRBSB response is not of the A type and the second correlation or the third correlation obtained for the first ATCRBS response is out of the predetermined range. It is determined that Furthermore, when the position information included in the first ATCRBS response is not within the range of the predicted position of the mode S aircraft associated with the time when the first ATCRBS response is received in the prediction data 135e, the determination unit 135c has a third correlation outside the predetermined range. In some cases, and when the A code between the first ATCRBS response and the mode S roll call does not match and the first ATCRBS response includes alert information, it is determined that the first ATCRBS response is transmitted from the ATCRBS machine. On the other hand, the determination unit 135c determines that the first ATCRBS response is transmitted from the mode S machine when it is not determined that the first ATCRBS response is transmitted from the ATCRBS machine.

  Based on the result of the determination, the generating unit 135d generates a mode S report regarding the mode S aircraft flying in the monitored airspace, generates an ATCRBS report regarding the ATCRBS aircraft, and outputs the generated report.

  The timing signal generator 136 forms and supplies the system operation in the azimuth direction of the question to be transmitted and the timing for forming the question signal so as to control the entire system of the processing unit 13.

<First All Call Period>
The processing of the mode S secondary monitoring radar 1 in the first all-call period will be described with reference to the flowchart shown in FIG.

  In the first all-call period, the transmission controller 131 transmits the mode A / C question Q1 (S11).

  When the first ATCRBS responses Aa1 and Ab1 are transmitted from the mode S machine or the ATCRBS machine in response to the mode A / C question Q1, the first ATCRBS responses Aa1 and Ab1 are received by the antenna 11, and the transmission / reception switch 121 and the receiver 123 are received. Is input to the ATCRBS response processor 133 (S12). Here, the mode S secondary monitoring radar 1 receives responses from a plurality of aircraft in the monitored airspace.

  The ATCRBS response processor 133 determines whether or not the input first ATCRBS responses Aa1 and Ab1 are normal responses (S13). When the input first ATCRBS responses Aa1 and Ab1 are normal responses (YES in S13), the ATCRBS response processor 133 outputs the first ATCRBS responses Aa1 and Ab1 to the monitor processor 135, and the monitor processor 135 stores the memory ( (S14). The monitoring processor 135 stores all the received normal first ATCRBS responses Aa1 and Ab1 in the memory.

  Here, the monitoring processor 135 does not know whether the first ATCRBS response that is input and stored in the memory is a response transmitted from either the mode S machine or the ATCRBS machine.

<Second all-call period>
The processing of the mode S secondary monitoring radar 1 in the second all-call period will be described using the flowchart shown in FIG.

  In the second all-call period, the transmission controller 131 transmits the A / C dedicated question Q2 and the mode S all-call question Q3 (S21).

  When the mode S all-call response Ab2 is transmitted from the mode S machine to the mode S all-call question Q3, the mode S all-call response Ab2 is received by the antenna 11, via the transmission / reception switch 121 and the receiver 123. The mode S response processor 132 is input (S22). When the input mode S all-call response Ab2 is a normal response (YES in S23), the mode S response processor 132 records the mode S response Ab2 as a processing target in the mode S response data, and also monitors the processor 135. Output to. The monitoring processor 135 stores the input mode S response Ab2 in a memory (not shown) (S24).

  Further, when the second ATCRBS response Ab2 is transmitted from the ATCRBS machine to the mode A / C dedicated question Q2, the second ATCRBS response Ab2 is received by the antenna 11, and the ATCRBS is received via the transmission / reception switch 121 and the receiver 123. The data is input to the response processor 133 (S25). When the input second ATCRBS response Aa2 is a normal response (YES in S26), the ATCRBS response processor 133 sets the second ATCRBS response Aa2 as a processing target and stores the memory (not shown) of the ATCRBS response processor 133 as second ATCRBS response data. ) And output to the monitoring processor 135. The monitoring processor 135 stores the input second ATCRBS response Aa2 in a memory (not shown) (S27).

  In this manner, the monitoring processor 135 stores all the received normal mode S all call responses Ab2 and the second ATCRBS response Aa2 in the memory. The aircraft data registered here includes, for example, aircraft position information and the like, and is output to the outside via the monitoring processor 135.

  Correlation processing and determination processing performed by the monitoring processor 135 following the processing described in FIG. 4 will be described with reference to the flowchart of FIG.

  The correlation processing unit 135a obtains the correlation (first correlation C1) of the position information using the range, azimuth and altitude included in the second ATCRBS response Aa2 and the first ATCRBS response Aa1 and Ab1 stored in the memory, and stores them in the memory. Store (S301).

  If the determination unit 135c determines that the obtained first correlation C1 is within a predetermined range and the mode A code and the mode C code included in each response are the same (YES in S302), The 2ATCRBS response Aa2 is registered in the memory as a processing target, and the classification unit 135b types the first ATCRBS responses Aa1 and Ab1 recorded in the memory (S303).

  Specifically, when there is a response to both the mode A / C question Q1 and the mode A / C dedicated question Q2, the classifying unit 135b sets the first ATCRBS response as the A type. That is, when the second ATCRBS response Aa2 is also received from the aircraft that transmitted the first ATCRBS response, the first ATCRBS response is registered as the A type. On the other hand, when there is a response only to the mode A / C dedicated question Q2, the determination unit 135c registers the first ATCRBS response as the B type. That is, when the second ATCRBS response Aa2 is not received from the aircraft that has transmitted the first ATCRBS response recorded in the memory, the first ATCRBS response is set to the B type. Here, the response of type A is a candidate for a response transmitted from an ATCRBS machine, and the response of type B is a candidate for a response transmitted from a mode S machine.

  Subsequently, the correlation processing unit 135a obtains the correlation (second correlation C2) of the position information using the range and azimuth included in the mode S all call response Ab2 and the first ATCRBS responses Aa1 and Ab1 stored in the memory. And stored in the memory (S304).

  If the determination unit 135c determines that the obtained second correlation C2 is within a predetermined range and the mode S address included in each response is the same (YES in S305), the mode S all call response Ab2 is registered in the memory as a response to be processed (S306).

  Subsequently, it is determined whether the first ATCRBS responses Aa1 and Ab1 are transmitted from the mode S machine or from the ATCRBS machine. When the type of any first ATCRBS response is type B (YES in S308), the mode S all call response Ab2 of this type B first ATCRBS response and the correlation within the predetermined range (second correlation C2) is recorded in the memory It is determined whether the first ATCRBS response is a response transmitted from the registered mode S machine (S309).

  When there is a mode S all-call response Ab2 that is a correlation within a predetermined range with the B-type first ATCRBS response (YES in S309), the determination unit 135c determines that the target first ATCRBS response has been transmitted by the mode S machine. Judgment is made and the judgment result is stored (S310, S311). Specifically, the determination unit 135c stores in the memory data in which the content of the first ATCRBS response of interest is included in the mode S report. The generation unit 135d generates a mode S report using the data stored in the memory at the report generation timing.

  When the type of the first ATCRBS response is A type (NO in S308), it is determined that the target first ATCRBS response is transmitted by the ATCRBS machine, and the determination result is stored (S312, S313). Specifically, the determination unit 135c stores in the memory data in which the content of the first ATCRBS response of interest is included in the ATCRBS report. The generation unit 135d generates an ATCRBS report using the data stored in the memory when generating the report.

  On the other hand, when the type of the first ATCRBS response is B type and there is no correlation mode S all call response Ab2 within the predetermined range (no second correlation C2 within the predetermined range) (YES in S308, NO in S309) Then, the process shown in FIG. 5 is terminated, and the process proceeds to a correlation process with a roll call response described later with reference to FIG.

  By repeating the processes in steps S308 to S313, the process of determining whether the first ATCRBS responses Aa1 and Ab1 received during the first all-call period are transmitted from the mode S machine or the ATCRBS machine is performed. The process ends (S307).

  An example of determining whether or not the first ATCRBS response is transmitted by the mode S machine will be described with reference to FIG. In the example shown in FIG. 6, the mode S all call response Ab2 received for the mode S all call question Q3, the second ATCRBS response Aa2 received for the mode A / C dedicated question Q2, and the mode A / C question Q1. The first ATCRBS responses Ab1 and Aa1 received in response to are received and stored in the memory. The first ATCRBS response Ab1 shown in FIG. 6 is a response transmitted by the mode S machine (A code: 860000) that transmitted the mode S all call response Ab2.

  In step S301, the correlation processing unit 135a obtains the first correlation C1 for the response Aa2 and the response Ab1, and the response Aa2 and the response Aa1, and temporarily stores them in the memory.

  Thereafter, the determination unit 135c determines whether or not the first correlation C1 between the response Aa2 and the response Ab1 and the first correlation C1 between the response Aa2 and the response Aa1 are within predetermined ranges in step S302, and registration is performed in step S303. To do.

  For example, here, the ATCRBS response Ab1 is of type B because the second ATCRBS response transmitted from the same aircraft does not exist in the memory. Further, the response Aa2 and the response Aa1 are transmitted by the same aircraft, and the first correlation C1 falls within a predetermined range and is registered as a processing target. Here, the ATCRBS response Aa1 is of the A type because the second ATCRBS response Aa1 transmitted from the same aircraft exists in the memory.

  In subsequent step S304, the correlation processing means 135a obtains the second correlation C2 for the response Ab2 and the response Ab1, and the response Ab2 and the response Aa1, and temporarily stores them in the memory.

  After that, the correlation processing means 135a determines whether or not the second correlation C2 of the response Ab2 and the response Ab1 and the second correlation C2 of the response Ab2 and the response Aa1 are within predetermined ranges in step S305, and in step S306. sign up. For example, since the response Ab2 and the response Ab1 are transmitted from the same aircraft, the second correlation C2 is within a predetermined range, and the mode S address is also the same, they are registered as processing targets.

  From the registered result, in the subsequent steps S308 to S311, the first ATCRBS response Ab1 is of the B type and the second correlation C2 with the response Ab2 is within a predetermined range. Is determined to have been transmitted from the machine, and is included in the mode S report by the generation means 135d. In subsequent steps S308, 312, and 313, since the first ATCRBS response Aa1 is of the A type, it is determined by the determining unit 135c that the first ATCRBS response Aa1 is transmitted from the ATCRBS machine, and is included in the ATCRBS report by the generating unit 135d.

  As described above, in the mode S secondary monitoring radar, the first ATCRBS response is transmitted from the mode S aircraft by obtaining the correlation between the second ATCRBS response and the mode S all call response and classifying the first ATCRBS response. Or that transmitted from an ATCRBS aircraft, and can be included in the report to accurately monitor the aircraft flying in the monitored airspace.

<Roll call period>
The processing of the mode S secondary monitoring radar 1 during the roll call period will be described with reference to the flowchart of FIG.

  When the mode S roll call question Q4 to be transmitted is stored in the memory (not shown) during the roll call period (YES in S41), the transmission controller 131 transmits the mode S roll call question Q4 (S42). ).

  When the mode S roll call response Ab3 is transmitted from the mode S machine to the mode S roll call question Q4, the mode S roll call response Ab3 is transmitted to the mode S via the antenna 11, the transmission / reception switch 121 and the receiver 123. It is input to the response processor 132 (S43).

  When the input mode S roll call response Ab3 is a normal response (YES in S44), the mode S response processor 132 registers the aircraft data 132b and outputs the mode S roll call response Ab3 to the monitoring processor 135. (S45).

  On the other hand, when the input mode S roll call response Ab3 is not a normal response (NO in S44), the process returns to step S42, and the question is transmitted again.

  Subsequently, the transmission controller 131 generates a mode S roll call question Q4 to be transmitted in the next roll call period by the input from the monitoring processor 135 and stores it in the memory (S46).

  The correlation processing and determination processing performed by the monitoring processor 135 when the result of step S309 in the flowchart of FIG. 5 is NO or when the processing of FIG. 7 is completed will be described using the flowchart of FIG.

  When the mode S roll call response Ab3 is received (YES in S501), the determination unit 135c has a predetermined correlation (third correlation C3) between the mode S roll call response Ab3 and the first ATCRBS response obtained by the correlation processing unit 135a. It is determined whether it is within the range (S503). Specifically, the correlation processing unit 135a obtains the correlation of the position information as the third correlation C3 using the range, azimuth, and altitude included in the response, and is used by the determination unit 135c.

  When the third correlation C3 is within the predetermined range (YES in S503), the determination unit 135c determines whether or not the A codes included in the responses match (S504). If the A codes match (YES in S504), the determination unit 135c determines whether an alert has occurred (S505). Here, the alert is information indicating the occurrence of an abnormality or the like, and can be determined from information included in the flight status of the mode S roll response Ab3.

  When the A code matches (YES in S504) or when the A code does not match and an alert is generated (NO in S504, YES in S505), the determination unit 153b determines that the first ATCRBS response to be processed is It is determined that the mode S device has transmitted (S507), and the determination result is recorded in the memory together with the content of the first ATCRBS response (S508).

  On the other hand, when the mode S roll call response has not been received (NO in S501), the determination unit 135c determines which mode S machine in which the aircraft position information included in the target first ATCRBS response is stored in the storage device. It is determined whether it is within the predicted position range (S509). When the aircraft position information included in the first ATCRBS response is within the range of the predicted position of the mode S aircraft and the first ATCRBS response is the B type (YES in S509, YES in S510), the process proceeds to step S504.

  If it is out of the range of the predicted position (NO in S509) and is not a B type first ATCRBS response (NO in S510), the determination unit 135c determines that the target first ATCRBS response has been transmitted by the ATCRBS machine. Then, the determination result is recorded in the memory together with the content of the first ATCRBS response (S512). Here, whether or not the first ATCRBS response is the B type is determined using the type classified in step S303 in FIG. 5 and stored in the memory.

  In addition, when it is determined that it is out of range (NO in S503), when no alert is generated (NO in S505), or when it is not type B (NO in S506), the ATCRBS sent by the ATCRBS machine It is determined that the response is made, and the determination result is recorded (S511, S512).

  An example of processing when the first ATCRBS response Ab1 and the mode S roll call response Ab3 are received from the same mode S machine (A code: 860000) will be described with reference to FIG. In the example shown in FIG. 9, the second ATCRBS response Aa2 received for the mode A / C dedicated question Q2, the first ATCRBS responses Ab1 and Aa1 received for the mode A / C question Q1, and the mode S roll call question Q4. The mode S roll call response Ab3 received for is stored in the memory. The first ATCRBS response Ab1 shown in FIG. 9 is a response transmitted by the mode S machine (A code: 860000) that transmitted the mode S roll call response Ab3. Further, in the example shown in FIG. 9, the mode S secondary monitoring radar 1 has not received a response from the mode S machine with respect to the mode S all call question Q3.

  First, when the determination unit 135c targets the first ATCRBS response Ab1, since the response Ab1 and the response Ab3 are transmitted from the same aircraft, the third correlation C3 falls within a predetermined range, and the process proceeds to YES in step S503. . Further, since the A codes match because they are transmitted to the same aircraft, the process proceeds to YES in step S504. If an alert has occurred, the process proceeds to YES in step S505. However, if no alert has occurred, the determination unit 135c determines that the response Ab1 has been transmitted by the mode S machine, and the mode S Included in the report.

  If the determination unit 135c determines that the third correlation C3 is not within the predetermined range because the response Aa1 and the response Ab3 are transmitted by different aircraft when the first ATCRBS response Aa1 is targeted, NO is determined in step S503. Proceed to On the other hand, even if the third correlation C3 is within the predetermined range, since the first ATCRBS response Aa1 is of the A type, the process proceeds to NO in step S506. Accordingly, the response Aa1 is determined to be transmitted by the ATCRBS machine and included in the ATCRBS report.

  An example of the second correlation process and the second determination process when the roll call response Ab3 that should have been received from the mode S machine (A code: 860000) could not be received will be described with reference to FIG. In the example shown in FIG. 10, the second ATCRBS response Aa2 received for the mode A / C dedicated question Q2 and the first ATCRBS responses Ab1 and Aa1 received for the mode A / C question Q1 are stored in the memory. In the example shown in FIG. 10, the response Ab1 is a response transmitted by the mode S machine (A code: 860000). Further, in the example shown in FIG. 10, the mode S secondary monitoring radar 1 cannot receive the response from the mode S machine transmitted to the mode S roll call question Q4.

  Since the mode S roll call response has not been received, the process proceeds to NO in step S501. First, when the determination unit 135c targets the first ATCRBS response Ab1, since the position information of the response Ab1 is a response transmitted from the mode S machine, it is within the range of the predicted position of the mode S machine, and YES in step S509 Proceed to Subsequently, since the response Ab1 is of type B, the process proceeds to NO in step S510. Further, since the A codes match, the process proceeds to YES in S504, and because the B type, the process proceeds to YES in step S506. Accordingly, in step S508, the response Ab1 is determined to have been transmitted by the mode S machine, and is included in the mode S report.

  Next, when the determination unit 135c targets the first ATCRBS response Aa1, since the response Aa1 is a response transmitted from the ATCRBS machine, it is outside the range of the predicted position of the mode S machine, and NO is determined in step S509. move on. Accordingly, in step S511, the determination unit 135c determines that the response Aa1 is transmitted from the ATCRBS machine, and sets it as a target to be included in the ATCRBS report.

  As described above, in the mode S secondary monitoring radar 1, as shown in FIG. 10, even if a response from the mode S machine is not received for the mode S roll call question, the mode S machine The first ATCRBS response from can be included in the Mode S report, and the aircraft flying in the monitored airspace can be accurately monitored.

  As described above, the mode S secondary monitoring radar according to the best embodiment of the present invention transmits a mode A / C question, a mode A / C dedicated question, a mode S all call question, a mode S roll call question, Each received response is correlated and typed to determine whether the ATCRBS response is sent by a Mode S machine or sent by an ATCRBS machine. As a result, even if the mode S secondary surveillance radar cannot receive a response to the mode S all call question or the mode S roll call question, the aircraft uses the ATCRBS response received for the mode A / C question. Can be monitored.

  Although the mode S secondary monitoring radar 1 has been described as hardware, the mode S secondary monitoring radar 1 having each processing means in the CPU is realized by installing a monitoring program in the CPU of a general computer. The

  As described above, the present invention has been described according to each embodiment. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  It goes without saying that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the matters described in the above description and the invention specific matters according to the obvious claims.

It is a functional block diagram of the mode S secondary surveillance radar concerning the best embodiment of the present invention. It is explanatory drawing of the timing which transmits the question in the mode S secondary monitoring radar shown in FIG. It is a flowchart explaining an example of the process in a 1st all-call period. It is a flowchart explaining an example of the process in a 2nd all-call period. It is a flowchart explaining an example of the process regarding the response received in FIG. It is an example explaining the response received in the all-call period. It is a flowchart explaining an example of the process in a roll call period. It is a flowchart explaining an example of the process regarding the response received in FIG. It is an example explaining the response received during a roll call period. It is another example explaining the response received during a roll call period. It is the schematic of a mode S secondary surveillance radar. A question transmitted from the mode S secondary monitoring radar and a response received. It is explanatory drawing of the timing which transmits the question in the conventional mode S secondary monitoring radar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mode S secondary monitoring radar 11 ... Antenna 12 ... Transmission / reception part 121 ... Transmission / reception switch 122 ... Transmitter 123 ... Receiver (reception means)
13. Processing unit 131 ... Transmission controller (transmission control means)
132 ... Response processor 132a ... Determination means 132b ... Aircraft data 133 ... ATCRBS response processor 133a ... Correlation processing means 133b ... Aircraft data 134 ... Channel manager 135 ... Monitoring processor 135a ... Correlation processing means 135b ... Classification means 135c ... Determination Means 135d ... Generation means 135e ... Prediction data 136 ... Timing signal generator 2 ... Transponder 21 ... Antenna 22 ... Transmitter / receiver 23 ... Signal processor

Claims (3)

A mode in which an ATCRBS transponder and a mode S transponder are installed, which are equipped with an ATCRBS transponder that flies in the specified surveillance airspace by using a mode A / C question, a mode A / C dedicated question, and a mode S all call question in combination with an all call question. Mode S secondary monitoring radar for monitoring S aircraft ,
A transmission control means for transmitting an A / C question during the first all-call period and transmitting an A / C dedicated question and a mode S all-call question during the second all-call period;
A first ATCRBS response is received for the A / C question from the ATCRBS machine and the mode S machine, a second ATCRBS response is received from the ATCRBS machine for the A / C dedicated question, and the mode S machine A receiving means for receiving a mode S all call response to the mode S all call question;
Correlation processing means for obtaining a correlation with respect to position information included in the received first ATCRBS response and second ATCRBS response;
It is determined that the first ATCRBS response whose correlation with the second ATCRBS response is within a predetermined range is a response transmitted from the ATCRBS device, and the first ATCRBS response whose correlation with the second ATCRBS response is not within the predetermined range is received from the mode S device. Determining means for determining that the response is a candidate for
Generating means for generating a report on the state of an aircraft flying in the monitored airspace based on the result of the determination;
A mode S secondary surveillance radar comprising:   When the correlation between the position information included in the first ATCRBSB response determined to be a candidate for a response from the mode S machine and the received mode S all call response is within a predetermined range, the determination means includes the first ATCRBS response The mode S secondary monitoring radar according to claim 1, wherein the mode S is determined to be a response from the mode S aircraft. The mode S secondary monitoring radar includes a storage device that stores prediction data associated with a predicted position that is a position where each aircraft is scheduled to fly at each time,
The transmission control means transmits a mode S roll call question during a roll call period,
The receiving means receives a mode S roll call response to the mode S roll call question from the mode S machine,
The correlation processing means obtains a correlation between the first ATCRBS response and the mode S roll call response,
When the position information included in the first ATCRBS response is not within the range of the predicted position of the mode S aircraft associated with the time when the first ATCRBS response is received in the predicted data, the determination means includes the first ATCRBS response and the mode S. When the correlation with the roll call response is outside a predetermined range, and when the A code of the first ATCRBS response and the mode S roll call do not match and the first ATCRBS response includes alert information, The mode S secondary monitoring radar according to claim 1, wherein it is determined that the 1ATCRBS response is transmitted from the ATCRBS machine.

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