JP5728276B2 - Radar apparatus and monitoring method - Google Patents

Description

  Embodiments described herein relate generally to a radar apparatus and a monitoring method for monitoring flight of an aircraft.

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

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

  During the all call period, the mode S secondary monitoring radar calculates the predicted position of the aircraft to be monitored from the azimuth angle at which the response arrives and the altitude information included in the response. In the mode S secondary monitoring radar, a schedule for sending a question and receiving a response to each aircraft is determined from the calculated predicted position. However, the angle measurement accuracy is affected by the radio wave condition and the aircraft azimuth and distance from the Mode S secondary monitoring radar, and the predicted position may not be obtained accurately, and the acquisition of the aircraft during the roll call period is interrupted. There is a fear.

  On the other hand, in the mode S secondary monitoring radar, as a method for obtaining the aircraft with high accuracy, the parameters of the GICB register possessed by the transponder of the aircraft are acquired, and the dynamic information (magnetic direction, speed, rate of elevation) included in the parameters is obtained. Can be used. When the parameters of the GICB register are used, it is possible to acquire more accurate position information than the position information included in the mode S response.

  On the other hand, the response to the parameter request of the GICB register is a long response, and the data size is larger than the short response that is a response to the normal mode S individual question. Therefore, it is necessary to set the response reception time longer in the schedule. . For this reason, when the parameter acquisition of the GICB register is frequently used, the beam schedule is compressed in the mode S secondary monitoring radar, and there is a possibility that an aircraft that cannot be captured may be generated.

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

  As described above, in the conventional mode S secondary monitoring radar, when the mode S response is used in the roll call period, the predicted position of the aircraft cannot be accurately calculated, and there is a possibility that it is difficult to capture the aircraft. Further, when the GICB parameter is acquired, there is a possibility that it is difficult to capture all the aircraft that have been captured due to the beam schedule being compressed.

  Therefore, according to the embodiment, a radar apparatus and a monitoring method capable of accurately specifying and capturing a predicted position of an aircraft are provided.

In the radar apparatus of the embodiment, the mode S secondary monitoring radar includes an aircraft data storage unit, a question generation unit, a calculation unit, and an update unit. The aircraft data storage unit stores aircraft data including a predicted position that is position information of the aircraft in the next scan. In the roll call period, the question generation unit generates a roll call question and transmits a response including the parameters of the GICB register of the transponder mounted on the aircraft instead of generating the roll call question to the aircraft included in the aircraft data. A request signal for requesting is periodically generated and output to the transmission means. The calculation unit calculates the position of the aircraft from the response received by the receiving unit in response to the roll call question, and calculates the predicted position of the aircraft from the aircraft dynamic information included in the parameter of the GICB register. The update unit updates the aircraft data at the predicted position calculated by the calculation unit.

It is a functional block diagram explaining the structure of the mode S secondary monitoring radar which concerns on embodiment. It is a figure explaining the signal transmitted / received by the mode S secondary monitoring radar of FIG. It is a flowchart explaining the predicted position specifying method in the mode S secondary monitoring radar of FIG.

  The mode S secondary monitoring radar 1 according to the embodiment will be described with reference to FIG. The mode S secondary monitoring radar 1 is a device that is installed in a ground station and monitors flight of an aircraft based on an answering question with a transponder 2 provided in the aircraft. In this mode S secondary monitoring radar 1, a collective question is transmitted during the all-call period, an individual question is transmitted during the roll call period, and the flight of the aircraft is monitored using a response received respectively from the collective question and the individual question. .

  In the mode S secondary monitoring radar 1, when transmitting the mode S individual question during the roll call period, a parameter request signal (GICB request signal) of the GICB register is used instead of the mode S individual question (for monitoring) periodically. , And obtain the accurate predicted position of the aircraft using the parameters of the GICB register acquired here, and continue to acquire the aircraft.

  The processing in the all-call period is the same as the conventional processing since the all-call question is transmitted and the roll call response is received and the received response is analyzed. A description will be omitted, and processing in the roll call period will be described.

  As shown in FIG. 1, the mode S secondary monitoring radar 1 is connected to an antenna 11, a transmission / reception unit 12 that transmits / receives a signal via the antenna 11, and a transmission / reception unit 12, and controls and receives a response to a question. The signal processing unit 13 for processing the aircraft, the aircraft data storage unit 14 for storing aircraft data related to the aircraft to be monitored, and the number of times storage unit 15 for storing the number of times data used by the signal processing unit 13 are provided.

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

  The signal processing unit 13 includes a transmission control unit 131 that controls transmission of a question, a response processing unit 132 that processes a received response, a calculation unit 133 that calculates a predicted position where an aircraft is present at the next scan, and a new predicted position. An update unit 134 that updates aircraft data, a determination unit 135 that determines timing for transmitting a GICB request signal, and a question generation unit 136 that generates a question to be transmitted are provided.

  Specifically, the transmission control unit 131 outputs a signal input from the question generation unit 136 to the transmission / reception unit 12 and causes the transmitter 122 to transmit via the antenna 11.

  When the transmission / reception unit 12 receives a signal received via the antenna 11, the response processing unit 132 analyzes the input signal and the mode S address included in the signal matches the mode S address included in the transmitted question. Is selected as a response to the question transmitted by the transmission control unit 131. The response processing unit 132 discards a signal that does not match the mode S address as not being a response to the question.

  In addition, the response processing unit 132 is a short response (normal roll call response) or a long response (response including a parameter of the GICB register transmitted to the GICB request signal (GICB response)). Determine whether. Specifically, the short response is a 5-bit DF field, a 3-bit FS field, a 5-bit DR field, a 6-bit UM field, a 13-bit AC field, and the like as shown in FIG. This is 56-bit data having a 24-bit AP field. The long response is a 112-bit response having a 56-bit MB field in addition to the data included in the short response as shown in FIG.

  When the response processing unit 132 determines that the response is a short response, the calculation unit 133 extracts the azimuth, altitude, and distance of the aircraft from the short response, and the aircraft scans the next scan using the extracted azimuth, altitude, and distance. A position (predicted position) that is predicted to exist sometimes is calculated. In addition, when it is determined that the response is a long response, the calculation unit 133 extracts the aircraft dynamic information (magnetic direction, speed, and lift rate) from the long response, and calculates the predicted position of the aircraft. The calculation unit 133 outputs the calculated predicted position to the update unit 134. The calculation method of the predicted position is a generally used method.

  The update unit 134 updates the aircraft data stored in the aircraft data storage unit 14 using the predicted position calculated by the calculation unit 133.

  The aircraft data stored in the aircraft data storage unit 14 includes, for example, the predicted position calculated by the calculation unit 133, the reception time of the response, and the like in addition to the aircraft identifier and position information analyzed from the response.

  When the determination unit 135 transmits the question to the aircraft, whether or not it is the parameter acquisition timing (GICB request signal transmission timing) of the GICB register according to the number of transmissions of the question stored in the number storage unit 15. And the determination result is output to the question generation unit 136.

  The number-of-times data stored in the number-of-times storage unit 15 associates the identifier of the aircraft with the number of times that the aircraft identified by the identifier has transmitted a normal roll call question after transmitting the GICB request signal.

  Specifically, when the value associated with the identifier of the aircraft that transmits the question in the frequency data is greater than or equal to a predetermined value, the determination unit 135 determines that it is time to transmit the GICB request signal. Further, when the determination unit 135 determines that it is time to transmit the GICB request signal, the determination unit 135 resets the number of times associated with the identifier of the aircraft in the number-of-times data of the number-of-times storage unit 15 to zero.

  On the other hand, when the value associated with the identifier of the aircraft that transmits the question in the number-of-times data is not equal to or greater than the predetermined value, the determination unit 135 determines that it is not the GICB request signal but the timing for transmitting a normal roll call question. . At this time, the determination unit 135 increments the number of times associated with the identifier of the aircraft in the number data of the number storage unit 15.

  That is, the determination unit 135 stores the number of times the roll call question is transmitted to each aircraft aircraft in the number storage unit 15, and when the GICB request signal is transmitted to a certain aircraft, the number storage unit 15 stores this aircraft. Reset the count.

  When the number of times set as the transmission timing of the GICB request signal in the determination unit 135 is set to 10 times, the mode S secondary monitoring radar 1 continuously issues the roll call question 10 times after transmitting the previous GICB request signal. When transmitted, the GICB register request signal is transmitted instead of the roll call question for the 11th time. Here, if the set value is reduced, the aircraft capture accuracy is improved, but the number of times that the mode S secondary monitoring radar 1 receives the long response increases, and the setting of the schedule becomes difficult. On the other hand, if the value to be set is increased, the schedule can be easily set, but the number of times that the parameter of the GICB register is used decreases, so that the acquisition accuracy of the aircraft decreases.

  The question generation unit 136 generates a question according to the determination result of the determination unit 135 and outputs the question to the transmission control unit 131. Specifically, when the determination unit 135 determines that it is time to transmit the GICB request signal, the question generation unit 136 generates a GICB request signal. If the determination unit 135 determines that it is time to transmit a normal roll call question, the question generation unit 136 generates a roll call question.

  Next, the flow of processing in the roll call period in the mode S secondary monitoring radar 1 will be described using the flowchart shown in FIG.

  In the mode S secondary monitoring radar 1, during the roll call period, the determination unit 135 determines whether it is the transmission timing of the GICB request signal (S1).

  When the determination unit 135 determines that it is not the transmission timing of the GICB request signal (NO in S1), the question generation unit 136 generates a normal roll call question (S2). On the other hand, when the determination unit 135 determines that it is the transmission timing of the GICB request signal (YES in S1), the question generation unit 136 generates a GICB request signal (S3).

  Thereafter, the transmission control unit 131 transmits the signal generated by the question generation unit 136 in step S2 or S3 (S4).

  When the response processing unit 132 receives a signal in response to the signal transmitted by the transmission control unit 131 in step S4 (S5), whether or not the mode S address included in the signal matches the mode S address predicted to be received. Is determined (S6). Here, when the mode S address does not match (NO in S6), the response processing unit 132 discards it because it is an unnecessary signal (S7), but when the mode S address matches (YES in S6), the response processing The unit 132 determines whether it is a short response as a response to the question transmitted by the transmission control unit 131 (S8).

  When it is determined that the response is a short response (YES in S8), the response processing unit 132 outputs the azimuth, altitude, and distance included in the signal to the calculation unit 133 (S9). The calculation unit 133 calculates the predicted position of the aircraft using the azimuth, altitude, and distance input in step S4 (S10). Thereafter, the update unit 134 updates the aircraft data in the aircraft data storage unit 14 using the predicted position calculated in step S5 (S11), and returns to the process of step S1.

  On the other hand, when it is determined that the response is not a short response but a long response (NO in S8), the response processing unit 132 outputs the dynamic information included in the signal to the calculation unit 133 (S12). The calculation unit 133 calculates the predicted position of the aircraft at the next scan using the dynamic information input in step S12 (S13). Thereafter, the update unit 134 updates the aircraft data in the aircraft data storage unit 14 using the predicted position calculated in step S13 (S14), and returns to the process of step S1.

  As described above, in the mode S secondary monitoring radar according to the embodiment, when transmitting the roll call question, in addition to the normal roll call question, the GICB request signal is transmitted to acquire the parameters of the GICB register. Get the exact position. In the mode S secondary monitoring radar, the predicted position can be accurately obtained by using the accurate position of the aircraft obtained from the parameters of the GICB register, so that the question response with the aircraft can be ensured and the aircraft can be captured. Can be continued.

  As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. Further, the present invention naturally includes various embodiments not described herein.

DESCRIPTION OF SYMBOLS 1 ... Secondary monitoring radar 11 ... Antenna 12 ... Transmission / reception part 121 ... Transmission / reception switch 122 ... Transmitter 123 ... Receiver 13 ... Signal processing part 131 ... Transmission control part 132 ... Response processing part 133 ... Calculation part 134 ... Update part 135 ... Determining unit 136 ... Question generating unit 14 ... Aircraft data storage unit 15 ... Number of times storage unit 2 ... Transponder

Claims (4)

A flight unit comprising: a transmission unit that transmits a question from the transmission device to the aircraft; and a reception unit that receives a response transmitted from the aircraft in response to the question. The flight of the aircraft using information included in the response received by the reception unit A radar device for monitoring
An aircraft data storage unit that stores aircraft data including predicted positions that are aircraft position information in the next scan;
A request for requesting an aircraft included in the aircraft data to transmit a response including a parameter of a GICB register of a transponder mounted on the aircraft instead of generating a roll call question and generating a roll call question during the roll call period A question generator that periodically generates a signal and outputs the signal to the transmission means;
A calculation unit that calculates the position of the aircraft from the response received by the reception unit in response to the roll call question, and calculates the predicted position of the aircraft from the dynamic information of the aircraft included in the parameters of the GICB register;
An update unit for updating the aircraft data at the predicted position calculated by the calculation unit;
A radar apparatus comprising: Number of times storage unit that stores the number of times data including the number of times that the question generation unit generated a roll call question after the previous generation of the parameter request signal;
It is determined whether or not the number of times stored in the number of times data is a predetermined number or more, and a determination unit that causes the question generation unit to generate a parameter request signal when the number of times becomes a predetermined number or more,
The radar apparatus according to claim 1, further comprising: A flight unit comprising: a transmission unit that transmits a question from the transmission device to the aircraft; and a reception unit that receives a response transmitted from the aircraft in response to the question. The flight of the aircraft using information included in the response received by the reception unit A monitoring method in a radar device for monitoring
In the roll call period, instead of generating a roll call question and generating a roll call question for an aircraft included in the aircraft data that is stored in the aircraft data storage unit and includes the predicted position that is the position information of the aircraft in the next scan Periodically generating a request signal requesting transmission of a response including a parameter of a GICB register of a transponder mounted on the aircraft;
Transmitting the generated roll call question and request signal;
Calculating a predicted position of the transmitted and calculates the position of the aircraft from the response received for the roll-call interrogation was, said aircraft from kinetic information of the aircraft included in the parameter of the transmitted GICB register,
Updating the aircraft data with the calculated predicted position;
A monitoring method comprising: A step of determining whether or not the number of times the roll call question is generated after generation of the previous parameter request signal is stored in the frequency storage unit is a predetermined number or more;
Generating a parameter request signal when the predetermined number of times is exceeded;
The monitoring method according to claim 3, further comprising:

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