JP2009103555A - Mode s secondary monitoring radar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance precision of capture of a transponder by a mode S secondary monitoring radar. <P>SOLUTION: The mode S secondary monitoring radar includes: a registering table 138 for registering information relating to a registering machine capturing a roll call period; a temporarily registering table 137 for registering information relating to a temporarily registering machine being a candidate of a capturing object in the roll call period; a temporarily registering part 132d for registering an aircraft as the temporarily registering machine to the temporarily registering table 137 when receiving signals other than all call responses from an aircraft other than the registering machine in all call periods; a transmission control part 131 for transmitting roll call query to the registering machine and transmitting the roll call query to the temporarily registering machine; and a registering part 132e for registering the temporarily registering machine as a new registering machine to the registering table. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mode S secondary monitoring radar that captures an aircraft using a received signal.

  In air traffic control, information (target report) on the flight of each aircraft monitored by a Mode S secondary surveillance radar (SSR mode S: Secondary Surveillance Radar Mode S) is used. As shown in FIG. 5, the mode S secondary monitoring radar 1a transmits a question to the transponder 2 mounted on the aircraft, and receives a response transmitted from the transponder 2 in response to the transmitted question. It decodes the received response and monitors the aircraft flying in the surveillance airspace.

  The transponder 2 mounted on the aircraft monitored by the mode S secondary monitoring radar 1a includes a mode S transponder and an ATCRBS transponder having different processes. The mode S secondary monitoring radar 1a captures an aircraft on which the transponder 2 having different processes is mounted, so that it distinguishes between an “all call period” and a “roll call period” and executes different processes in each period. Each processing is executed in accordance with internationally standardized standards (for example, see Non-Patent Document 1).

  Specifically, the mode S secondary monitoring radar 1a sets an aircraft (ATCRBS machine) equipped with an ATCRBS transponder as a target for capturing an all-call period, and an aircraft equipped with a mode S transponder (mode S machine) in a roll call period. It is targeted for capture. The mode S secondary monitoring radar 1a detects the mode S aircraft during the all call period.

  The mode S secondary monitoring radar 1 that executes such processing includes a transmitter 122 that transmits a question corresponding to each period via the transmission / reception switch 121 and the antenna 11, and the antenna 11 and transmission / reception as shown in FIG. A receiver 123 that receives a response from the transponder 2 via the switch 121 is provided. The transmission of the signal by the transmitter 122 is controlled by the transmission control unit 131, the signal received by the receiver 123 is processed by the mode S response processing unit 142 or the ATCRBS response processing unit 133, and the target report is output by the monitoring processing unit 145. Generated. Specifically, the process related to the question response with the mode S transponder is executed by the mode S response processing unit 142, and the process related to the question response with the ATCRBS transponder is executed by the ATCRBS response processing unit 133.

  Here, the mode S secondary monitoring radar 1a determines the aircraft to be captured only by the aircraft that responds to the question from its own site (own site ID = PI field). Therefore, the mode S secondary monitoring radar 1a uses a signal (ACAS signal) transmitted from an Airborne Collision Avoidance System (ACAS) or a broadcast type automatic subordinate monitoring (ADS-B) transmitted from a transponder. When Dependent Surveillance-Broadcast) signals (mode S extended squitter signals) are received, these signals are discarded without being processed.

In the conventional mode S secondary monitoring radar 1a, the received signal other than the response to the question is discarded in this manner, thereby preventing the fruit (false detection due to the response to the question from another site) in the response multi-site environment. In addition, erroneous detection due to radio waves of collision prevention communication by an aircraft collision prevention apparatus performed between aircrafts is prevented.
ICAO, "INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES AERONAUTICAL TELECOMMUNICATIONS ANNEX 10", July 1998

  However, in all call periods, the mode S response may overlap with other signals such as the mode A / C response, fruit or false, and the mode S secondary monitoring radar 1a may not recognize the mode S response. Further, depending on the positional relationship between the mode S secondary monitoring radar 1a and the aircraft, the transponder 2 side may not receive a question, or the mode S secondary monitoring radar 1a may not receive a response. Further, a response drop by the transponder 2 may occur. As described above, in the conventional mode S secondary monitoring radar 1a, when an undetectable aircraft occurs, there is a problem in that the accuracy of capturing the aircraft decreases.

  In view of the above problems, the present invention provides a mode S secondary monitoring radar having improved transponder acquisition accuracy.

  A mode S secondary monitoring radar according to a feature of the present invention is a mode for monitoring an aircraft flying in a monitored airspace based on an all-call response received during an all-call period and a roll-call response received during a roll-call period. S secondary monitoring radar, a registration table in which information about registered machines to be captured in the roll call period is registered, and a temporary registration table in which information about temporary registration machines that are candidates for acquisition in the roll call period are registered When a signal other than an all-call response is received from an aircraft other than the registered machine during the all-call period, a temporary registration unit that registers the aircraft as a temporary registration machine in the temporary registration table, and a roll-call question to the registered machine during the roll-call period A transmission control unit that transmits a roll call question to the temporary registration device, and a temporary registration in response to the roll call question. When receiving a roll call response from the machine, and a registration unit for registering in the registration table temporary registration unit as the new registration device.

  According to the present invention, it is possible to improve the accuracy of transponder acquisition by the mode S secondary monitoring radar.

  The mode S secondary monitoring radar according to the preferred embodiment of the present invention transmits a question to the transponder 2 in the same manner as the conventional mode S secondary monitoring radar 1a described above with reference to FIGS. A target report is generated and output based on the response received from the transponder 2 in response to the question. In the following, the same components as those described above with reference to FIGS. 5 and 6 will be described with the same reference numerals.

  A mode S secondary monitoring radar 1 according to the preferred embodiment of the present invention shown in FIG. 1 determines an aircraft to be captured based on a response received from a transponder 2 in response to a question, and an ACAS signal or mode S When the extended squitter signal is received, the aircraft to be captured is determined using the ACAS signal and the mode S extended squitter.

  As shown in FIG. 1, the mode S secondary monitoring radar 1 includes an antenna 11, a transmission / reception unit 12, and a signal processing unit 13. The antenna 11 is connected to the transmission / reception unit 12 and is connected to a transmitter 122 via a transmission / reception switch 121. And connected to the receiver 123.

  The signal processing unit 13 includes a transmission control unit 131 that controls transmission of a signal via the transmitter 122, a mode S response processing unit 132 and an ATCRBS response processing unit 133 that input a signal received by the receiver 123, and signal transmission / reception. The channel management unit 134 for executing the schedule, the monitoring processing unit 135 for executing the aircraft monitoring process based on the received signal to generate the target report, and the timing signal for controlling the timing of each operation in the signal processing unit 13 And a timing signal generator 136 for generating.

  In addition, the signal processing unit 13 receives a response during the all-call period, and stores a temporary registration table 137 for storing data related to a temporary registration machine that is a candidate for acquisition during the roll call period, and an acquisition target during the roll call period. And a registration table 138 for storing data related to a certain registration machine. Specifically, the temporary registration table 137 stores data related to the aircraft acquired by the ACAS signal or the mode S extended squitter signal, and the registration table 138 stores data related to the mode S aircraft acquired by the roll call response (range, Azimuth, altitude information, mode S address, etc.) are stored.

  Based on the timing signal from the timing signal generator 136, the channel manager 134 sets the all-call period and roll-call period allocation in the beam dwell time T, and schedules reception windows (detection windows) for detecting each response. Execute. In addition, the channel management unit 134 outputs schedule information regarding each allocated period to the transmission control unit 131 and outputs schedule information of the reception window to the mode S response processing unit 132 or the ATCRBS response processing unit 133, respectively.

  The transmission control unit 131 outputs a question stored in advance in a memory (not shown) to the transmitter 122 based on the schedule information regarding each period from the channel management unit 134 and the timing signal from the timing signal generation unit 136. Then, the data is transmitted to the transponder 2 via the transmission / reception switch 121 and the antenna 11. Specifically, the transmission control unit 131 transmits an all call question (mode S all call question and mode A / C all call question) during the all call period, and a roll call question (mode S roll) during the roll call period. Send a call question).

  The receiver 123 receives a response transmitted from the transponder 2 via the antenna 11 and the transmission / reception switch 121. The receiver 123 receives an ACAS signal transmitted from the aircraft collision prevention apparatus and a mode S extended squitter signal transmitted from the transponder 2 via the antenna 11 and the transmission / reception switch 121. The receiver 123 supplies the received mode S response (mode S all call response and mode S roll call response), ACAS signal, and mode S extended squitter signal to the mode S response processing unit 132. Further, the receiver 123 supplies the received ATCRBS response (mode A / C all call response) to the ATCRBS response processing unit 133.

  As shown in FIG. 1, the mode S response processing unit 132 includes a detection unit 132a, a determination unit 132b, an output unit 132c, a temporary registration unit 132d, and a registration unit 132e, and the signal supplied from the receiver 123 is The detection unit 132e detects the corresponding reception window. When the signal is detected, the determination unit 132b determines whether or not the detected signal is a processing target. Further, the output unit 132c outputs a signal determined to be a processing target to the monitoring processing unit 135.

  Specifically, with respect to the signal received by the receiver 123 within the all-call period, the determination unit 132b matches the own site ID representing the monitoring airspace of the mode S secondary monitoring radar 1 and the PI field included in the signal. It is determined whether or not. Here, the output unit 132c sends to the channel management unit 134 and the monitoring processing unit 135 as the mode S response to be processed transmitted from the mode S machine in response to the question that transmitted the signal whose own site ID and PI field match. Supply.

  On the other hand, the determination unit 132c determines that a signal whose own site ID does not match the PI field is an ACAS signal or a mode S extended squitter signal, and the received ACAS signal or mode S extended squitter signal is registered in the registration table 138. It is determined whether or not the signal is transmitted from the registered machine. If the determination unit 132b determines that the signal is not a signal transmitted from the registration device, the temporary registration unit 132d registers the aircraft that transmitted the signal in the temporary registration table 137 as a temporary registration device. On the other hand, when the signal is transmitted from the registration machine, it is a target for capturing the all-call period and does not need to be newly registered in the temporary registration table 137 or the registration table 138. Therefore, the determination unit 132b discards the signal transmitted from the registration device as a non-processing target.

  The mode S response processing unit 132 to which the mode S response is supplied within the roll call period determines whether the registered mode S address and the mode S address included in the mode S response match, and the matched mode S The response is supplied as a response to be processed to the channel management unit 134 and the monitoring processing unit 135, and the mode S response that does not match is discarded as not being processed.

  The ATCRBS response processing unit 133 detects the supplied ATCRBS response in the corresponding reception window and determines whether or not it is a processing target. The ATCRBS response processing unit 133 supplies the ATCRBS response to be processed to the management unit 134 and the monitoring processing unit 135, and discards the ATCRBS response that is not the processing target.

  The monitoring processing unit 135 generates and outputs a target report based on the response supplied with the response from the mode S response processing unit 132 or the ATCRBS response processing unit 133.

  Next, the setting of the reception window in the channel management unit 134 will be specifically described with reference to FIG. The channel management unit 134 sets a reception window according to the distance between the aircraft that is the subject of the inquiry transmission and the mode S secondary monitoring radar 1.

  The registration table 138 stores the range, azimuth, altitude information, mode S address, and the like included in the mode S response previously received from the registration device that is the transmission target of the question. The channel management unit 134 obtains the distance between the registration device and the mode S secondary monitoring radar 1 based on the range, azimuth, altitude information, mode S address, and the like stored in the temporary registration table 138, and the obtained distance. The timing for receiving a response from the registration device is predicted based on the above, and the reception window is set at the predicted timing. Therefore, as shown in FIGS. 2 (a) and 2 (b), when questions Q1 and Q2 are transmitted to aircrafts (transponders) located at different positions, from the transmission of questions Q1 and Q2 to the reception windows W1 and W2. The timing is different.

  On the other hand, since the data for specifying the position of the aircraft is not included in the ACAS signal or the mode S extended squitter signal transmitted from the temporary registration machine, the data for specifying the position of the temporary registration machine is not included in the temporary registration table 137. Not included. Therefore, the channel management unit 134 cannot grasp the position of the aircraft and cannot predict the timing from when the question Q3 is transmitted until the response A3 is received. Therefore, when transmitting the question Q3 to the temporary registration device, the channel management unit 134 compares it with the reception windows W1 and W2 shown in FIG. 2 (a) and FIG. 2 (b) as shown in FIG. 2 (c). Then, a wide reception window W3 for receiving the response A3 with respect to the question Q3 is set.

  Next, processing in the mode S response processing unit 132 after the mode S secondary monitoring radar 1 receives the ACAS signal or the mode S extended squitter signal during the all call period will be described using the flowchart shown in FIG.

  When the receiver 123 receives a signal during the all-call period (S11), the detection unit 132a of the mode S response processing unit 132 detects the received signal within the corresponding reception window (S12), and within the corresponding reception window. Signals not received in (1) are discarded as not being processed (S16).

  Subsequently, the determination unit 132b determines whether or not the own site ID and the PI field match for the signal received within the reception window (S13). When the PI field of the signal received within the reception window does not match the own site ID (NO in S13), the determination unit 132b determines that the signal is an ACAS signal or a mode S extended squitter signal, and the registration table 138. It is determined whether or not the received signal is a signal transmitted from the registration device 2a (whether the mode S address included in the signal is included in the registration table 138) (S14).

  When the received signal is not a signal transmitted from the registration device 2a (NO in S14), the temporary registration unit 132d temporarily registers the aircraft that transmitted the signal in the temporary registration table 137 as the temporary registration device 2b (S15). ). Specifically, the mode S address included in the signal is registered in the temporary registration table 137.

  On the other hand, when the received signal is a signal transmitted from the registration device 2a (YES in S14), the signal is discarded because it is already a roll call capture target (S16).

  When the PI field of the signal received within the reception window matches the local site ID (YES in S13), the signal is an all-call response transmitted in response to the all-call question, and the mode S response processing unit 132 In the same manner as in the prior art, processing related to an all-call response is executed (S17).

  When the all call period ends and the roll call period starts, the transmission control unit 131 transmits a roll call question to the temporary registration device 2b (S21). Since the reception window of the roll call response from the temporary registration device 2b for this roll call question is unknown at the timing at which the roll call response can be received, as described above with reference to FIG. Is set wider than the timing set. The transmission control unit 131 transmits the roll call question to the registration device 2a in addition to the temporary registration device 2b. However, the transmission of the roll call question to the registration device 2a is the same as the conventional one. In FIG. 3, it is omitted.

  When the receiver 123 receives a roll call response from the temporary registration device 2b during the roll call period (YES in S22), the detection unit 132a detects the received signal within the corresponding reception window (S23), and the corresponding reception. The roll call response not received in the window is discarded as not subject to processing, and the data related to the corresponding temporary registration device 2b is deleted from the temporary registration table 137 (S26).

  Subsequently, the determination unit 132b determines whether or not the AP field and the mode S address match for the roll call response received within the reception window (S24). When the AP field matches the mode S address (YES in S24), the registration unit 132e registers the temporary registration device 2b registered in the temporary registration table 137 in the registration table 138 as the registration device 2a (S25). ). Here, the registration unit 132e adds the data included in the roll call response received in step 22 to the registration table 138 and registers the registration device 2a.

  On the other hand, when the AP field and the mode S address do not match (NO in S24), the determination unit 132b deletes the roll call response as not being processed, and deletes data related to the corresponding temporary registration device from the temporary registration table 137. (S26).

  In FIG. 3, in order to explain processing when the mode S secondary monitoring radar 1 is an ACAS signal or a mode S extended squitter, processing when a normal all-call response is received is omitted. When the received signal is an all-call response, the mode S secondary monitoring radar 1 performs the same processing as the conventional one. In FIG. 3, processing related to normal roll call question answering is also omitted, but in the mode S secondary monitoring radar, the same processing as conventional is performed.

  Referring to FIG. 4, the ACAS signal # 1, transmitted from the aircraft (registered machine) 2a and the unregistered aircraft (unregistered machine) 2c registered in the registration table 138 by the mode S secondary monitoring radar 1, respectively. An example when # 2 is received will be described.

  As shown in FIG. 4A, the mode S secondary monitoring radar 1 is a signal transmitted from the registration device 2a in step S14 even if it receives the ACAS signal # 1 from the registration device 2a in the all-call period. In step S16, the ACAS signal # 1 is discarded without being temporarily registered.

  On the other hand, the mode S secondary monitoring radar 1 determines that the ACAS signal # 2 received from the unregistered device 2c is not a signal transmitted from the registered device 2a in step S14, and enters the temporary registration table 137 in step S15. Provisionally registered. The unregistered machine 2c becomes the temporarily registered machine 2b when temporarily registered.

  Thereafter, when the roll call period starts, the mode S secondary monitoring radar 1 transmits the roll call question Q1 to the registration device 2a registered in the registration table 138 in step S21, as shown in FIG. 4B. At the same time, the roll call question Q3 is also transmitted to the temporary registration device 2b registered in the temporary registration table 137.

  When the mode S secondary monitoring radar 1 that transmitted the roll call question Q1 receives the roll call response A1 transmitted from the registration device 2a in the specified reception window within the roll period, as shown in FIG. 4C. Generate a target report based on the received roll call response.

  On the other hand, when the mode S secondary monitoring radar 1 receives the roll call response A3 transmitted from the temporary registration device 2b in the specified reception window within the roll call period, the step S24 is performed based on the received roll call response A3. Is stored in the registration table 138, and a target report is generated and output based on the roll call response A3.

  As described above, the mode S secondary monitoring radar 1 captures a transponder (aircraft) without discarding the ACAS signal and the mode S extended squitter signal that were discarded by the conventional mode S secondary monitoring radar 1a. We are using. Therefore, even if the aircraft cannot be captured without receiving the all call response during the all call period, if the ACAS signal and the mode S extended squitter signal are received from the same aircraft, these signals are used. The aircraft to be captured during the roll call period can be determined. Thereby, the mode S secondary monitoring radar 1 can improve the accuracy of the capture of the transponder by effectively using the received signal.

It is a functional block diagram explaining the mode S secondary surveillance radar concerning the best embodiment of the present invention. It is a figure explaining the receiving window which the mode S secondary surveillance radar of FIG. 1 sets. 3 is a flowchart for explaining an example of processing when the mode S secondary monitoring radar of FIG. 1 receives an ACAS signal or a mode S extended squitter signal. It is a conceptual diagram when the mode S secondary monitoring radar of FIG. 1 receives an ACAS signal or a mode S extended squitter signal from a registered machine and a non-registered machine. It is a conceptual diagram explaining the conventional mode S secondary monitoring radar and transponder. It is a functional block diagram explaining the mode S secondary monitoring radar of FIG.

Explanation of symbols

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 ... Mode S response processing part 132a ... Detection part 132b ... Determination Unit 132c ... Output unit 132d ... Temporary registration unit 132e ... Registration unit 133 ... ATCRBS response processing unit 134 ... Channel management unit (management unit)
135: Monitoring processing unit 136 ... Timing signal generating unit 137 ... Temporary registration table 138 ... Registration table

Claims (5)

A mode S secondary monitoring radar for monitoring an aircraft flying in a monitored airspace based on an all call response received during an all call period and a roll call response received during a roll call period,
A registration table in which information about registered machines to be captured in the roll call period is registered;
A temporary registration table in which information on temporary registration machines that are candidates for acquisition in the roll call period is registered;
A temporary registration unit that registers the aircraft as the temporary registration machine in the temporary registration table when a signal other than an all-call response is received from an aircraft other than the registration machine during the all-call period;
A transmission control unit that transmits a roll call question to the registration machine during a roll call period, and transmits a roll call question to the temporary registration machine;
In response to the roll call question, when a roll call response is received from the temporary registration machine, a registration unit that registers the temporary registration machine as a new registration machine in the registration table;
A mode S secondary monitoring radar comprising: A detection unit for detecting the all call response and the roll call response received in a preset reception window;
2. The management unit according to claim 1, further comprising a management unit configured to set a wider reception window for receiving a roll call response from the temporary registration device than a reception window for receiving a roll call response from the registration device. Mode S secondary monitoring radar. A determination unit that determines that a signal received during the all call period and whose PI field does not match the own site ID representing the monitored airspace is a signal other than the all call response;
The mode S secondary monitoring radar according to claim 1 or 2, wherein the temporary registration unit registers an aircraft that has transmitted a signal other than the all-call response as the temporary registration device. In the temporary registration table, the mode S address of the temporary registration machine is registered as information on the temporary registration machine,
When the AP field of the roll call response matches the mode S address of the temporary registration machine, the registration unit registers the temporary registration machine as a new registration machine in the registration table, and stores information on the temporary registration machine. The mode S secondary monitoring radar according to any one of claims 1 to 3, wherein the mode S secondary monitoring radar is erased from the temporary registration machine. 5. The monitoring processing unit according to claim 1, further comprising: a monitoring processing unit that generates and outputs information about the monitored aircraft as a target report based on the received all call response and the roll call response. Mode S secondary surveillance radar.

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