JP2008175784A - Mode s secondary surveillance radar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mode S secondary surveillance radar capable of accurately keeping track of an aircraft (transponder) existing within a surveillance airspace, allowing the aircraft to fly safely. <P>SOLUTION: This mode S secondary surveillance radar is provided with a receiver 123 for receiving a response to a query, and for receiving a mode S expanded squitter transmitted from the aircraft, a correlation processing means 135b for finding a correlation value between the response and the mode S expanded squitter, when receiving the response, an effectiveness determination means 135c for determining the propriety of using the response transmitting aircraft as a surveillance object by a roll call query/response, based on the correlation value, and an updating means 135a for adding a record including a mode S address of the aircraft to a registration data, when determining the aircraft as the surveillance object by a roll call query/response. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mode S secondary monitoring radar for monitoring an aircraft existing in a monitored airspace.

  The mode S secondary monitoring radar (SSR mode S) 4 of the ground station is installed as a control facility at the main point of the airport or air route. As shown in FIG. 7, the mode S secondary monitoring radar 4 transmits a question to the aircraft on which the transponder 20 is mounted, and receives a response transmitted from the aircraft transponder 20 in response to the question. The mode S secondary monitoring radar 4 uses the data included in the response to monitor the aircraft flying in the corresponding monitoring airspace (for example, Non-Patent Document 1).

  The mode S secondary monitoring radar 4 and the transponder 20 are configured in accordance with a standard as described in Non-Patent Document 1. There are two types of transponders 20 mounted on the aircraft: ATCRBS transponders and mode S transponders. In the mode S secondary monitoring radar 4, in order to capture two types of transponders, an all call period and a roll call period are set and monitoring is performed. During the all-call period, the aircraft is monitored by mode A / C dedicated (collective) question answering for aircraft equipped with ATCRBS transponders and mode S dedicated question answering for aircraft equipped with mode S transponders. Further, during the roll call period, the aircraft is monitored by the mode S individual question answering according to the scheduling based on the response received corresponding to the mode S exclusive question.

  As shown in FIG. 7, the transponder 20 receives a question transmitted from the mode S secondary monitoring radar 4, transmits / receives a response to the received question, and controls transmission / reception and generates a response. And a signal processing unit 24 to be executed.

  As shown in FIGS. 7 and 8, the mode S secondary monitoring radar 4 includes a transmission / reception unit 12 including an antenna 11 used for question answering, a transmission / reception switch 121, a transmitter 122, and a receiver 123. Yes. In addition, the mode S secondary monitoring radar 4 includes a processing unit 14 that includes a computer and forms an interrogator together with the transmission / reception unit 12. The processing unit 14 includes a transmission controller 131, a channel manager 134, a mode S response processor 142, an ATCRBS response processor 133, a timing signal generator 136, and a monitoring processor 145, and processes related to transmission of questions and received responses Execute processing related to.

  The channel manager 134 sets a period for receiving a response to a mode S dedicated question in the all call period, sets a period for sending an individual question in the roll call period based on the received mode S response, and supports each individual question The setting of the period for receiving the response to be performed is scheduled.

  The transmission controller 131 generates a mode S dedicated batch question and a mode A / C dedicated question during the all call period according to the control from the channel manager 134, and transmits the generated questions to the transmitter 122, the transmission / reception switch 121 and the antenna 11. To send through. These questions include the own site ID that is the identifier of the monitoring airspace of the mode S secondary monitoring radar 4. Also, the transmission controller 131 generates a mode S individual question during the roll call period according to the control from the channel manager 134, and transmits the generated question.

  The response transmitted from the aircraft in response to the mode S dedicated question and the mode A / C dedicated question is input to the receiver 123 via the antenna 11 and the transmission / reception switch 121, and the mode S response processor 142 or the ATCRBS response. Input to the processor 133.

  The mode S response processor 142 obtains the distance from the position of the mode S secondary monitoring radar 4 to the aircraft, the direction of the aircraft, and the like from the mode S address and the position included in the input response, and the own site ID and response are obtained. It is determined whether the included PI (Partiy / InterrogatorID) field matches. The mode S response processor 142 outputs the matched response to the channel manager 134 and the monitoring processor 145 as a response to be processed. Further, the mode S response processor 142 discards a response that does not match as a response that is not subject to processing.

  When a response to be processed is input from the mode S response processor 142, the monitoring processor 145 determines whether or not there is a duplicate reception of the mode S address, and a detection report when there is no duplicate reception of the mode S address. Create, register, and output. The monitoring processor 145 outputs a control signal for operating scheduling in the roll call question / response to the channel manager 134 together with data included in the response for which the detection report is created.

Here, “duplicate reception of mode S address” means that the mode S secondary monitoring radar 4 receives a plurality of responses including the same mode S address. Originally, the mode S address is uniquely determined for each mode S transponder, and there should be no duplicate reception of the mode S address. However, for example, duplicate reception of the mode S address may occur due to a setting mistake in a transponder in an aircraft. Therefore, the supervisory processor 145 determines whether the mode S address is duplicated. If a duplicated mode S address is received, the supervisory processor 145 is identified by the duplicated mode S address for the safety of the aircraft. Even when the aircraft is subject to roll call monitoring, the roll call monitoring for this aircraft is stopped, and initial acquisition by all calls is performed again.
ICAO, "INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES AERONAUTICAL TELECOMMUNICATIONS ANNEX 10", July 1998

  As described above, the mode S secondary monitoring radar 4 monitors the aircraft equipped with the mode S transponder captured during the all call period, and monitors the aircraft equipped with the mode S transponder that is monitored during the roll call period. Aircraft equipped with ATCRBS transponders will be monitored during the all-call period. However, when the mode S address is received repeatedly, even if the aircraft that sent this response is subject to roll call monitoring, it is not subject to roll call monitoring and is subject to all call monitoring.

  However, the all-call period is limited, and the number of aircraft that can be processed during the all-call period is limited, which causes various problems. Specifically, (1) The problem is that aircraft that are already subject to roll call monitoring will not be monitored when duplicate reception of mode S address is received. (2) Rolling due to duplicate reception of mode S address. The problem of reducing the detection rate of aircraft equipped with ATCRBS transponders due to the increase in the number of captured aircraft due to being excluded from the roll call monitoring target that was the call monitoring target, (3) Duplicate mode S address The reception of the roll call that is the subject of the roll call by the reception is excluded from the subject of the roll call, and there is a problem that the number of captured aircraft increases and the detection rate of new aircraft decreases.

  In view of the above problems, an object of the present invention is to provide a Mode S secondary monitoring radar that accurately grasps an aircraft (transponder) existing in a monitored airspace and allows the aircraft to fly safely.

  The mode S secondary monitoring radar according to the feature of the present invention is a mode S secondary monitoring radar that transmits an all call question or a roll call question at a predetermined timing and monitors an aircraft existing in a certain monitoring airspace, A receiver that receives a response to the question and receives a mode S extended squitter transmitted from the aircraft, a correlation processing unit that obtains a correlation value between the response and the mode S extended squitter when the response is received, and based on the correlation value If it is determined that the aircraft that has transmitted the response is to be monitored by the roll call question / response and the aircraft is to be monitored by the roll call question / response, the mode S of the aircraft is determined. Updating means for adding a record including an address to the registered machine data.

  ADVANTAGE OF THE INVENTION According to this invention, the mode S secondary monitoring radar which grasps | ascertains correctly the aircraft (transponder) which exists in the monitoring airspace, and can fly an aircraft 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. In addition, the same code | symbol is attached | subjected to the same structure as the conventional mode S secondary monitoring radar 4 mentioned above in FIG. 8, and description is abbreviate | omitted.

  FIG. 1 is a configuration diagram illustrating an example of a mode S secondary monitoring radar (SSR mode S) 1. As shown in FIG. 1, a mode S secondary monitoring radar 1 of a ground station includes an antenna 11, a transmission / reception unit 12 connected to the antenna 11, and a processing unit 13 connected to the transmission / reception unit 12 and incorporating a computer. I have.

  As shown in FIG. 2, 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. 2, 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 processing unit 13 stores temporary registration machine data 137 and registration machine data 138 in the storage device. The registered machine data 138 includes a record that associates the “mode S address” of the aircraft (registered machine) to be monitored by the roll call question / response and the “position information” of the aircraft (registered machine). Further, if the temporarily registered machine data 137 includes the same mode S address as that of the registered machine in the mode S response received during the all-call period, the “mode S address” and “position” included in the mode S response are included. It includes a record associating "information" as temporary registration machine information.

  The transmitter 122 transmits the mode A / C dedicated question and the mode S dedicated question during the all call period via the transmission / reception switch 121 and the antenna 11 under the control of the processing unit 13, and the mode S individual question during the roll call period. Send.

  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 receiver 123 receives a mode S extended squitter such as ADS-B transmitted from the aircraft during the all call period. The mode S response and the mode S extended squitter include a mode S address that identifies the source aircraft.

  The mode S response processor 132 includes a response determination unit 132a and a duplication determination unit 132b as shown in FIG. 2 in order to perform processing related to the response received for the mode S-dedicated batch question. Further, the mode S response processor 132 stores signals (aircraft mode S response and mode S expansion squitter) input from the receiver 123 in a memory (not shown).

  When a signal is input from the receiver 123, the response determination unit 132a determines whether or not the own site ID corresponding to the monitored airspace of the mode S secondary monitoring radar 1 matches the PI field included in the response. The response determining unit 132a determines that the signal is a mode S response corresponding to the transmitted question when the own site ID and the PI field match, and that the signal is a mode S extended squitter when they do not match. When the own site ID and the PI field match (when the signal is a mode S response), the response determination unit 132a outputs a signal (mode S response) to the monitoring processor 135. The mode S response output to the monitoring processor 135 is deleted from the memory.

  When the temporary registration device is registered in the temporary registration device data 137, the duplication determination unit 132b determines whether the mode S address included in the mode S extended squitter stored in the memory matches the mode S address of the temporary registration device. Determine whether or not. If the mode S address of the mode S extended squitter and the mode S address of the mode S response match, the duplication determination unit 132b outputs the mode S extended squitter as a processing target to the monitoring processor 135 and then deletes it from the memory. In addition, when there is no match, the duplication determination unit 132b deletes the mode S extended squitter from the memory without outputting it to the monitoring processor 135.

  The monitoring processor 135 inputs the response received from the aircraft from the mode S response processor 132 and the ATCRBS response processor 133, outputs a detection report based on the response, and controls the transmission controller 131 and the channel manager 134. Output a signal. Since the monitoring processor 135 executes processing based on the response input from the mode S response processor 132, as shown in FIG. 2, the update unit 135a, the correlation processing unit 135b, the validity determination unit 135c, the multiple determination unit 135d, and The generation unit 135e is included.

  When the correlation processing unit 135b inputs the mode S extended squitter transmitted by the temporary registration device, the positional information associated with the mode S address of the temporary registration device in the temporary registration device data 137 (position information of the mode S response), the mode A correlation value is calculated from position information included in the S extended squitter. That is, the correlation processing unit 135b obtains a correlation value from the position information of the mode S response and the position information of the mode S extended squitter.

  The validity determination unit 135c determines whether or not there is a correlation between the position information of the mode S response and the position information of the mode S extended squitter based on the correlation value obtained by the correlation processing unit 135b, and outputs the determination result. . Specifically, the validity determination unit 135c determines whether or not the correlation value is included in a range determined by a predetermined upper limit value and lower limit value. Here, when there is a correlation, the mode S response is not a false signal, but a valid signal from the aircraft. When there is no correlation, the mode S response is not a signal transmitted from the aircraft specified by the mode S address included in the mode S response, but a false signal.

  The update unit 135a that has input the determination result having the correlation from the validity determination unit 135c adds the record of the temporary registration machine data 137 used for calculating the correlation value, and updates the registration machine data 138. In addition, the updating unit 135a updates the registration machine data 138, then deletes the target record and updates the temporary registration machine data 137. The mode S extended squitter stored in the memory is deleted from the memory when the correlation process is completed.

  When receiving the all-call mode S response, the multiple determination unit 135d determines whether the input mode S response overlaps the registration device and the mode S address, and outputs the determination result. Specifically, when the registered machine is registered in the registered machine data 138, the multiple determination unit 135d compares the mode S address included in the registered machine data 138 with the mode S address included in the input mode S response. When there is a match, the mode S response is a response sent by an aircraft with a duplicate mode S address or a response generated by a false, etc. Outputs the determination result of the transmitted response.

  When the determination result that the response transmitted from the aircraft having the mode S address with the duplicated mode S response or the response generated by the false is output by the multiple determination unit 135d, the update unit 135a is included in the mode S response. The temporary registration machine data 137 is updated by adding a record that associates the mode S address and the position information. On the other hand, when the determination result that the mode S response is transmitted from an aircraft that is not a registered machine is output by the multiple determination unit 135d, the update unit 135a creates a new link that associates the position information with the mode S address included in the mode S response. The registered machine data 138 is updated by adding a new record.

  Based on the received valid response, the generation unit 135e generates and outputs a detection report regarding the aircraft existing in the monitored airspace.

<Processing in Mode S secondary surveillance radar>
Next, the flow of processing executed by the mode S secondary monitoring radar 1 during the all-call period will be described using the flowchart shown in FIG.

  The mode S secondary monitoring radar 1 is controlled by the transmission controller 131 during the all-call period, and transmits a mode S-only collective question via the transmitter 122 and the antenna 11 (S1). The receiver 123 receives the signal transmitted from the aircraft via the antenna 11, and outputs the received signal to the mode S response processor 132 (S2). This signal is a “mode S response” or a “mode S extended squitter” transmitted in response to the mode S exclusive question. When the signal is input, the mode S response processor 132 combines the signal and stores it in a memory (not shown).

  The response determination unit 132a of the mode S response processor 132 determines whether or not the own site ID and the PI field match for each signal (mode S response or mode S extended squitter) stored in the memory (S3).

  When the local site ID and the PI field match (YES in S3), the mode S response processor 132 determines that the signal is a mode S response, and outputs the signal to the monitoring processor 135 and erases it from the memory (S4).

  On the other hand, if the own site ID and the PI field do not match (NO in S3), the duplication determination unit 132b determines whether or not the temporary registration device is registered in the temporary registration device data 137, assuming that it is a mode S extended squitter. (S5).

  When the temporary registration machine is registered in the temporary registration machine data 137 (YES in S5), the duplication determination unit 132b determines that the mode S address included in the mode S extended squitter is the mode S address included in the temporary registration machine data 137. That is, it is determined whether or not the mode S address of the temporary registration machine (S6).

  When the mode S address included in the mode S extended squitter is the mode S address of the temporary registration machine (YES in S6), the mode S response processor 132 outputs the mode S extended squitter as a processing target to the monitoring processor 135. And erased from the memory (S7).

  On the other hand, if the temporary registration machine is not registered in the temporary registration machine data 137 (NO in S3), and the mode S address included in the Mode S extended squitter is not the mode S address of the temporary registration machine (NO in S6), The mode S response processor 132 erases the mode S extended squitter from the memory without outputting it (S8).

  Subsequently, processing in the monitoring processor 135 will be described. The monitoring processor 135 stores the signal (mode S response or mode S extended squitter) input from the mode S response processor 132 in step S4 or S7 in a memory (not shown).

  The monitoring processor 135 determines whether or not the signal input from the mode S response processor 132 is a mode S extended squitter (S9).

  When the input signal is the mode S extended squitter (YES in S9), since the signal is the mode S extended squitter, the monitoring processor 135 executes processing (S10 to S16) when the mode S extended squitter is received. To do.

  The correlation processing unit 135b determines whether or not a temporary registration machine is registered in the temporary registration machine data 137 (S10).

  When the temporary registration machine is registered in the temporary registration machine data 137 (YES in S10), the correlation processing unit 135b determines that the mode S address included in the mode S extended squitter is the mode S address included in the temporary registration machine data 137. Whether it is the mode S address of the temporary registration machine (S11).

  When the mode S address included in the mode S extended squitter is the mode S address of the temporary registration machine (YES in S11), the correlation processing unit 135b uses the temporary registration machine data 137 to obtain positional information (mode) associated with the mode S address. The correlation value between the position information of the S response) and the position information associated with the same mode S address in the memory (position information of the mode S extended squitter) is obtained (S12).

  The validity determination unit 135c compares the obtained correlation value with a predetermined set value, and determines whether or not there is a correlation between the position information included in the mode S response and the position information included in the mode S extended squitter ( S13).

  If there is a correlation between the position information of the mode S response and the mode S extended squitter (YES in S13), the updating unit 135a adds a record of temporary registration machine data 137 that is a target of calculation of the correlation value to register machine data. 138 is updated (S14), the record is deleted, the temporary registration machine data 137 is updated, and the aircraft of the corresponding mode S address is set as the roll call monitoring target (S15).

  On the other hand, if there is no correlation between the mode S response and the position information of the mode S squitter (NO in S13), the aircraft of the corresponding mode S address is not subject to roll call, so it is not added to the registered machine data 138. The corresponding record is deleted and the temporary registration machine data 137 is updated (S15).

  When the processing of steps S10 to S15 is completed, the monitoring processor 135 deletes the target mode S extended squitter from the memory (S16).

  If the signal input from the mode S response processor 132 is not the mode S extended squitter (NO in S9), since the signal is the mode S response transmitted in response to the collective question, the monitoring processor 135 returns the mode S response. Processing (S17 to S21) when received is executed.

  The multiple determination unit 135d determines whether or not a registered machine is registered in the registered machine data 138 (S17).

  When the registered machine is registered in the registered machine data 138 (YES in S17), the multiple determination means 135d determines whether the mode S address included in the mode S response matches the mode S address included in the registered machine data 138. That is, it is determined whether or not it is the mode S address of the registered machine (S18).

  When the mode S address included in the mode S response is the mode S address of the registration machine (YES in S18), the updating unit 135a adds a new record generated based on the mode S response and temporarily registers the machine data 137. Is updated (S20). That is, when receiving the mode S response including the mode S address of the registered machine already registered in the registered machine data 138, the updating unit 135a records the mode S address included in the mode S response and the position information. Is added to the temporary registration machine data 137.

  On the other hand, when the temporary registration machine is not registered in the temporary registration machine data 137 (NO in S18) and when the mode S address included in the mode S response is not the mode S address included in the temporary registration machine data 137 (NO in S19). ), The updating unit 135a adds the new record generated based on the mode S response and updates the registration machine data 138 (S20). That is, when a mode S response is received from an aircraft that is not a registered machine, the updating unit 135a generates a record in which the mode S address included in the mode S response is associated with the position information, and adds the record to the registered machine data 138.

  Thereafter, the generating unit 135e generates and outputs a report based on the registered machine data 138 and the temporary registered machine data 137 (S21).

  The mode S secondary monitoring radar 1 executes a series of steps S1 to S21 during the all-call period, and registers the mode S address and position information of the aircraft that is the target of the mode S individual question response during the roll call period. Update to 138.

  Subsequently, using FIG. 4 to FIG. 6, the mode S secondary monitoring radar until the response including the same mode S address is repeatedly received in the all call period and stored as the registration device in the registration device data 138. Specific processing in 1 will be described. As shown in FIGS. 4 to 6, the mode S secondary monitoring radar 1 transmits a question beam from the antenna 11 and monitors the aircraft 2 existing in a predetermined monitoring airspace having a radius of a certain distance. The mode S secondary monitoring radar 1 scans 360 ° from a predetermined direction (direction North in FIGS. 4 to 6), and makes an inquiry / response.

  FIG. 4 illustrates a case where a response # 2 generated by a false or the like is detected after detecting a response # 1 from the aircraft 2 with respect to the collective question.

  Assume that the response # 1 is received from the aircraft 2 whose mode S address is “1111” by the antenna 11 of the mode S secondary monitoring radar 1. At this time, the update unit 135a of the mode S secondary monitoring radar 1 updates the registered machine data 138 by adding a record in which the mode S address “1111” included in the response # 1 is associated with the position information of the aircraft 2. .

  After that, the antenna 11 of the mode S secondary monitoring radar 1 receives the response # 2 including the mode S address “1111” which is not a response transmitted from the aircraft of the mode S address “1111” but a signal due to false etc. And At this time, since the registered machine data 138 already includes a record with the mode S address “1111”, a record in which “1111” is associated with the position included in the response # 2 is added to temporarily register the registered machine data 137. Update.

  Thereafter, when the mode S extended squitter having the mode S address “1111” is received, the correlation processing unit 135b temporarily registers the position information included in the mode S extended squitter # received from the aircraft 2 having the mode S address “1111”. A correlation value with the position information associated with the mode S address “1111” is obtained from the machine data 137.

In the example shown in FIG. 4, the position information included in the response # 2 and the position information of the aircraft 2 included in the mode S extended squitter # 3 have no correlation, and the mode S secondary monitoring radar 1 # 2 is regarded as a false detection, and the mode S secondary monitoring radar 1 does not add to the registered machine data 138 as being not subject to roll call monitoring for the response # 2, but deletes such a record and temporarily registers the registered data 137. Update.

  If the mode S extended squitter # 3 cannot be received from the aircraft 2, the correlation cannot be obtained. Therefore, the mode S secondary monitoring radar 1 sets the response # 2 as a false detection. Do not add.

  FIG. 5 illustrates a case where the response # 1 from the aircraft 2 is detected after the response # 2 generated by false or the like is detected.

  Assume that the antenna 11 of the mode S secondary monitoring radar 1 receives the response # 2. This response # 2 is a signal due to false or the like, and is not a response transmitted from the aircraft having the mode S address “1111”, but includes the mode S address “1111”. At this time, the updating unit 135a of the mode S secondary monitoring radar 1 updates the registered machine data 138 by adding a record in which the mode S address “1111” included in the response # 2 is associated with the position information.

  Thereafter, it is assumed that the antenna 11 of the mode S secondary monitoring radar 1 receives the response # 1 from the aircraft 2 having the mode S address “1111”. At this time, since the registered machine data 138 already includes a record with the mode S address “1111”, the updating unit 1315a adds a record in which “1111” is associated with the position information of the aircraft 2 included in the response # 1. Then, the temporary registration machine data 137 is updated.

  Thereafter, when the mode S extended squitter having the mode S address “1111” is received, the correlation processing unit 135b receives the position information included in the mode S extended squitter # 3 received from the aircraft 2 having the mode S address “1111”, and the temporary information. A correlation value with the position information associated with the mode S address “1111” is obtained from the registered machine data 137.

  In the example shown in FIG. 5, it is assumed that the position information included in the response # 1 and the position information of the aircraft 2 included in the mode S extended squitter # 3 have a correlation, and the mode S secondary monitoring radar 1 Assuming that # 1 is not a false detection, a record based on the response # 1 is added to update the registration machine data 138, and the corresponding record is deleted to update the temporary registration data 137.

  If the mode S extended squitter # 3 cannot be received from the aircraft 2 with the mode S address “1111”, the correlation cannot be obtained, so the mode S secondary monitoring radar 1 determines whether or not the response # 1 is a false detection. The aircraft 2 having the mode S address “1111” that cannot be determined is not subject to roll call monitoring, but is subject to all-call monitoring.

  FIG. 6 illustrates a case where the response # 1b from the aircraft 2b is received after the response # 1a from the aircraft 2a is received. The case illustrated in FIG. 6 is a case where the same mode S address “1111” is duplicated due to, for example, a setting mistake in the transponder of the aircraft 2a or the aircraft 2b.

  It is assumed that response # 1a is received from the transponder of the aircraft 2a whose mode S address is “1111” by the antenna 11 of the mode S secondary monitoring radar 1. Here, the response # 1a includes the mode S address “1111”. At this time, the updating unit 135a of the mode S secondary monitoring radar 1 updates the registration machine data 138 by adding a record in which the mode S address “1111” included in the response # 1a is associated with the position information.

  Thereafter, it is assumed that the antenna 11 of the mode S secondary monitoring radar 1 newly receives the response # 1b from the transponder of the aircraft 2b whose mode S address is “1111”. At this time, since the registration machine data 138 already contains a record with the mode S address “1111”, the updating unit 135a adds a record in which “1111” is associated with the position information included in the response # 1b and temporarily registers it. The machine data 137 is updated.

  Thereafter, when the mode S extended squitter having the mode S address “1111” is received, the correlation processing unit 135b reads the mode S extended squitters # 3a and # 3b received from the aircraft 2 having the mode S address “1111” from the memory. Then, a correlation value between the position information associated with the mode S address “1111” in the temporary registration machine data 137 and the position information of the aircraft 2 included in the mode S extended squitters # 3a and # 3b stored in the memory is obtained.

  In the example shown in FIG. 6, it is assumed that there is a correlation between the position information included in the response # 1b and the position information of the aircraft 2b included in the mode S extended squitter # 3b, and the mode S secondary monitoring radar 1 incorrectly sets 1b. Suppose that it is not detected. Therefore, the aircraft 2b that has transmitted the response # 1b also updates the registration machine data 138 by adding a record based on the response # 1b as a capture target in the roll call question / response, and temporarily registers by deleting the corresponding record. Data 137 is updated.

  In the case described above, in the case of the conventional mode S secondary monitoring radar, when a plurality of responses including the same mode S address are detected, the roll call question / response is not targeted for each response. It was targeted for capture by response. However, according to the above-described mode S secondary monitoring radar 1 according to the present invention, when a response including the mode S address already registered in the registered machine data 138 is received, the response is transmitted using the mode S extended squitter. It is determined whether it is a false detection. Therefore, it is possible to increase the number of aircraft that are subject to roll call capture and improve all-call monitoring.

  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

  Although the present invention has been described by the embodiments as described above, it should not be understood that the descriptions 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 figure explaining the mode S secondary surveillance radar concerning the best embodiment of the present invention. It is a functional block diagram of the mode S secondary surveillance radar shown in FIG. It is a flowchart explaining an example of a process at the time of receiving a response with respect to all calls in the mode S secondary monitoring radar shown in FIG. It is an example of the monitoring in the secondary monitoring radar shown in FIG. It is another example of the monitoring in the secondary monitoring radar shown in FIG. It is another example of the monitoring in the secondary monitoring radar shown in FIG. It is a figure explaining the conventional mode S secondary surveillance radar. It is a functional block diagram of the mode S secondary monitoring radar shown in FIG.

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 13 ... Processing part 131 ... Transmission controller 132 ... Mode S response processor 132a ... Response determination means 132b ... Duplicate judgment means 133 ... ATCRBS response processor 134 ... Channel manager 135 ... Monitoring processor 135a ... Update means 135b ... Correlation processing means 135c ... Validity judgment means 135d ... Multiple judgment means 135e ... Generation means 136 ... Timing signal generator 137 ... Temporary registration machine data 138 ... Registration machine data

Claims (4)

A mode S secondary monitoring radar that transmits an all call question or a roll call question at a predetermined timing and monitors an aircraft existing in a certain monitoring airspace,
Registration machine data in which a record including the mode S address of the registration machine that is the subject of the roll call question is recorded,
A receiver for receiving a response to the question and receiving a mode S extended squitter transmitted from the aircraft;
When receiving the response, correlation processing means for obtaining a correlation value between the response and the mode S extended squitter;
Valid determination means for determining whether or not the aircraft that transmitted the response is to be monitored by a roll call question response based on the correlation value;
When it is determined that the aircraft is to be monitored by a roll call question answering, update means for adding a record including the mode S address of the aircraft to the registered machine data;
A mode S secondary surveillance radar comprising: When receiving a response including the mode S address of the registration machine, an update unit for adding a record including the mode S address to the temporary registration machine data;
The correlation processing unit obtains the correlation value from a mode S extended squitter including the mode S address when a response including a mode S address included in the temporary registration machine data is received. Mode S secondary surveillance radar. The response includes the position of the aircraft at the time of transmission;
The mode S extended squitter includes the position of the aircraft at the time of transmission;
The mode S secondary monitoring radar according to claim 1, wherein the correlation processing unit obtains the correlation value from a position included in the response and a position included in the mode S extended squitter. The response includes the position of the aircraft at the time of transmission;
The mode S extended squitter includes the position of the aircraft at the time of transmission;
The registered machine data includes the position of the registered machine together with the mode S address,
The temporary registration machine data includes the position of the temporary registration machine together with the mode S address,
The mode S secondary monitoring radar according to claim 2, wherein the correlation processing unit obtains the correlation value from a position included in the response and a position included in the mode S extended squitter.

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