JP5444202B2 - Transmitter - Google Patents

Description

  Embodiments described herein relate generally to a transmission device that receives a signal transmitted from an aircraft and transmits the signal to the aircraft using the received signal.

  In order to ensure flight safety of an aircraft, the aircraft is monitored using a radar such as a mode S secondary surveillance radar (SSR) that transmits and receives an inquiry signal and a response signal. In addition, in order to prevent a collision between aircrafts, broadcast-type automatic dependent surveillance (ADS-B) that exchanges position information between aircrafts is also used.

  Currently, the number of aircraft equipped with ADS-B compatible transponders corresponding to ADS-B is increasing, but the number of aircraft equipped with ADS-B compatible transponders is not sufficient. On the other hand, a system called TIS-B that distributes a signal related to an aircraft not equipped with an ADS-B compatible transponder has attracted attention.

  On the other hand, since the ADS-B signal uses the long response of mode S, the influence of interference or the like is strong in the transmission / reception of the signal between the secondary monitoring radar and the aircraft and the transmission / reception of the ADS-B signal between the aircraft. . For this reason, when TIS-B transmits a large amount of signals, there is a risk of adverse effects such as interference on transmission / reception of signals between the secondary monitoring radar and the transponder and transmission / reception of signals between the ADS-B compatible transponders.

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

  Therefore, the present invention provides a transmission apparatus that avoids the influence on transmission / reception of signals by a secondary monitoring radar or an ADS-B compatible transponder when signals are transmitted by TIS-B.

  A transmission device according to an embodiment of the present invention is a transmission device that transmits an extended squitter related to an aircraft instead of an aircraft to an aircraft equipped with an ADS-B device, and includes an extended squitter processing unit, a prediction unit, A scheduling unit and a transmission unit. When receiving the extended squitter transmitted from the aircraft, the extended squitter processing means associates the reception time with the extended squitter. The prediction means predicts the time at which the device itself newly receives the extended squitter from the reception time associated by the extended squitter processing means. The schedule means uses the time predicted by the prediction means to determine a schedule for restricting transmission of the extension squitter from the own apparatus at a time when the extension squitter is frequently received from the aircraft. The transmission unit transmits the extended squitter according to the schedule set by the schedule unit.

It is the schematic explaining the transmission / reception of the signal in the transmitter which concerns on embodiment. It is a block diagram explaining the structure of the transmission apparatus of FIG. It is a figure explaining the signal which the transmitter of FIG. 1 transmits / receives. It is a figure explaining the transmission schedule of the signal in the transmission apparatus of FIG.

  The transmission apparatus according to the embodiment will be described below with reference to the drawings. As illustrated in FIG. 1, a transmission device 1 according to the embodiment includes an ADS-B reception device 10 that receives an ADS-B signal of 1090 MHz transmitted and received by ADS-B compatible transponders 3a and 3b mounted on an aircraft, It has a TIS-B transmitter 11 that inputs the ADS-B signal received from the ADS-B receiver 10 and the reception time of the ADS-B signal and transmits a 1090 MHz TIS-B signal. In this transmission device 1, by controlling the transmission of the TIS-B signal according to the reception time of the ADS-B signal, the signals of the secondary monitoring radar and the ADS-B compatible transponders 3a and 3b by the TIS-B signal are transmitted. Avoid impact on sending and receiving. Specifically, the transmission of the ADS-B signal from the ADS-B compatible transponder is predicted, and during the period when it is predicted that many ADS-B signals are transmitted, the transmission of the TIS-B signal is stopped, Reduce the number of transmissions.

  Between the ADS-B compatible transponders 3a and 3b mounted on the aircraft, ADS-B signals are mutually transmitted and received to prevent collision. Further, the ADS-B compatible transponders 3 a and 3 b mounted on the aircraft may transmit a mode S response 1090 MHz in response to a 1030 MHz question to the secondary monitoring radar 2.

  A secondary monitoring radar 2 is connected to the transmission device 1. The transmission device 1 inputs monitoring data related to the aircraft obtained by transmitting a question and receiving a response from the secondary monitoring radar. The transmitter 1 generates a TIS-B signal to be transmitted using the monitoring data input from the secondary monitoring radar 2 when transmitting the TIS-B signal.

  The transmission apparatus 1 will be specifically described with reference to FIG. As shown in FIG. 2, the transmission device 1 includes a reception unit 101, a binarization processing unit 102, a first time management unit 103, and an extended squitter processing unit 104, an information processing unit 111, A TIS-B transmission apparatus 11 having a second time management unit 112, a transmission management unit 113, a conversion unit 114, and a transmission unit 115; In this transmission device 1, the ADS-B receiving device 10 and the TIS-B transmission device 11 have the synchronized first time management unit 103 and second time management unit 112 in the ADS-B transponders 3a and 3b. The transmission of the TIS-B signal can be controlled in accordance with the transmission of the ADS-B signal by.

<< ADS-B receiver >>
In the ADS-B receiving apparatus 10, the reception unit 101 receives a signal transmitted from an aircraft transponder. Thereafter, the binarization processing unit 102 binarizes the signal received by the reception unit 101.

  The first time management unit 103 is a clock or the like that manages the current time. When the extended squitter processing unit 104 receives the signal binarized by the binarization processing unit 102, when the input signal is an ADS-B signal (extended squitter), the receiving unit 101 receives the ADS-B signal. The received time is acquired from the time management unit 103. Further, the extended squitter processing unit 104 outputs the binarized ADS-B signal to the TIS-B transmission apparatus 11 together with the time when the binary ADS-B signal is acquired. Here, the extended squitter of the ADS-B signal includes the mode S address of the transmitted aircraft, position information, and the like.

<< TIS-B receiver >>
The TIS-B transmitter 11 processes and transmits monitoring data related to aircraft monitoring input from the secondary monitoring radar (SSR) 2 and the ADS-B signal input from the ADS-B receiver 10 in the information processing unit 111. A TIS-B signal (extended squitter) is generated. As shown in FIG. 2, the information processing unit 111 includes a monitoring data input unit 111a, an extended squitter input unit 111b, a generation unit 111c, a prediction unit 111d, and a schedule unit 111e.

  The monitoring data input unit 111a receives monitoring data related to aircraft monitoring from the secondary monitoring radar 2 and outputs the monitoring data to the generation unit 111c. Further, the extended squitter input unit 111b receives the ADS-B signal and the reception time received from the ADS-B receiving apparatus 10, and outputs them to the generation unit 111c and the prediction unit 111d.

  The generation unit 111 c generates a TIS-B signal to be transmitted based on the input monitoring data and the ADS-B signal, and outputs the generated TIS-B signal to the transmission management unit 113. Here, the input monitoring data includes the mode S address, position information, and the like of the aircraft acquired by the secondary monitoring radar 2. The generated TIS-B signal includes aircraft position information estimated from the ADS-B signal and aircraft mode S address included in the monitoring data, and position information included in the ADS-B signal and monitoring data. .

  Specifically, based on the monitoring data and the ADS-B signal, the generation unit 111c cannot transmit / receive the ADS-B signal due to the influence of a transponder or an obstacle that does not support ADS-B. Identify the transponder. Thereafter, the generation unit 111c generates a TIS-B signal including information on the aircraft on which the transponder is mounted from the contents of the monitoring data, instead of the transponder not supporting ADS-B. Further, the generation unit 111c replaces the ADS-B compatible transponder that can be predicted that transmission / reception cannot be performed due to the influence of an obstacle or the like, and uses the content of the received ADS-B signal to perform transmission / reception using the ADS-B compatible transponder. A B signal is generated.

  The predicting means 111d predicts the range of the time when the aircraft that transmitted the ADS-B signal will next transmit the ADS-B signal from the input ADS-B signal and the reception time, and outputs the prediction result to the scheduling means 111e. To do. Here, the ADS-B compatible transponders 3a and 3b are normally set to transmit an ADS-B signal twice per second. Therefore, the predicting unit 111d receives a new ADS-B signal from the aircraft that has transmitted the ADS-B signal within a predetermined range about 0.5 seconds after the reception time input together with the ADS-B signal. Predict it. Specifically, a prediction time te is set in advance in the prediction unit 111d, and the prediction unit 111d (0.5 + te / seconds) after (0.5−te / 2) seconds with reference to the past reception time. 2) The time after the second is set as the range of the reception time of the new ADS-B signal, that is, the range of the time when the new ADS-B signal is transmitted and received.

  The TIS-B transmission apparatus 11 includes a second time management unit 112 such as a clock for managing the current time. The second time management unit 112 needs to be synchronized with the first time management unit 103. That is, the first time management unit 103 manages the time of the received signal, and the second time management unit 112 manages the time of the signal to be transmitted. If the signals are not synchronized, ADS- This is because it is impossible to control the transmission of the TIS-B signal according to the reception timing of the B signal. Therefore, for example, it is conceivable to use a GPS clock as the first time management unit 103 and the second time management unit 112.

  The scheduling unit 111e determines whether or not the TIS-B signal can be transmitted according to the future reception timing of the ADS-B signal predicted by the prediction unit 111d, and outputs it to the transmission management unit 113. Specifically, the schedule unit 111e can permit transmission of the TIS-B signal without limitation in a time range where it is predicted that the ADS-B signal is not received from the ADS-B compatible transponder. In addition, the schedule unit 111e limits transmission of the TIS-B signal in a time range predicted to receive the ADS-B signal from the ADS-B compatible transponder. At this time, if the number of ADS-B signals received is less than or equal to a predetermined value, control is performed to limit the number of TIS-B signal transmissions to be less than or equal to a predetermined value. If the number of ADS-B signals received is greater than or equal to a predetermined value, The transmission is controlled by scheduling to prohibit the transmission of the TIS-B signal.

  The transmission management unit 113 outputs the TIS-B signal generated by the generation unit 111c to the conversion unit 114 in accordance with transmission control from the schedule unit 111e. Also, the conversion unit 114 converts the input TIS-B signal into a transmission format (IF signal) and outputs the transmission format to the transmission unit 115. Thereafter, the transmission unit 115 transmits the input TIS-B signal.

  3 and 4, transmission of ADS-B signals (extended squitters) from aircrafts TG1 and TG2 equipped with ADS-B compatible transponders and transmission of TIS-B signals by TIS-B transmitter 11 will be specifically described. Explained.

  For example, it is assumed that the expansion squitter S1 is transmitted from the aircraft TG1, and then the expansion squitter S2 is also transmitted from the aircraft TG2, and the ADS-B receiving apparatus 10 receives the respective expansion squitters S1 and S2 (FIG. 4A). ). The ADS-B receiving apparatus 10 attaches the received times t1 and t2 to the extended squitters S1 and S2 received by the extended squitter processing unit 104, and outputs them to the TIS-B transmitting apparatus 11.

  After that, in the TIS-B transmission apparatus 11, the extended squitters S1 ′, S2 ′ are newly transmitted from the same aircraft TG1, TG2 based on the reception times t1, t2 attached to the extended squitters S1, S2 input by the prediction unit 111d. The time range for receiving S2 ′ is predicted (FIG. 4B). For example, for the aircraft TG1, the range of the predicted time te centered about 0.5 seconds after the reception time t1 of the extended squitter S1 becomes the predicted period for newly receiving the extended squitter S1 '. In addition, for the aircraft TG2, the range of the predicted time te centered about 0.5 seconds after the reception time t2 of the extended squitter S2 becomes the predicted period for newly receiving the extended squitter S2 '.

  In the example shown in FIG. 4 (c), the schedule unit 111e sets the predicted reception period of each of the future extended squitters S1 ′ and S2 ′ determined by the prediction unit 111d as “transmission reduction period” (level 2), Reduce the number of TIS-B signals to be transmitted. In addition, the schedule unit 111e sets a period in which the prediction periods of the extended squitters S1 'and S2' overlap for a plurality of aircraft as a "transmission prohibition period" (level 3), and prohibits transmission of the TIS-B signal. Further, the other period is set as a “transmission permitted period” (level 1), and the TIS-B signal is transmitted without restriction.

  That is, when a plurality of TIS-B signals are transmitted from the transmission apparatus 1 during a period in which it is predicted that ADS-B signals (extended squitter) are transmitted / received by the aircrafts TG1 and TG2, transmission / reception of signals between ADS-B compatible transponders. May interfere. Therefore, the scheduling unit 111e reduces the number of TIS-B signal transmissions during the transmission reduction period. Also, when transmitting a TIS-B signal from the transmission apparatus 1 during a period in which a plurality of ADS-B signals are predicted to be simultaneously transmitted and received by the aircrafts TG1 and TG2, transmission / reception of signals between ADS-B transponders. May interfere. Therefore, the schedule unit 111e prohibits transmission of the TIS-B signal during the transmission prohibition period.

  For example, the schedule unit 111e always outputs a transmission permission signal during the transmission permission period, outputs a transmission permission signal including the number of signals that can be transmitted during the transmission reduction period, and transmits during the transmission prohibition period. The transmission of the TIS-B signal is controlled by not outputting the permission signal.

  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 ... Transmitter 2 ... Secondary monitoring radar 3a, 3b ... ADS-B corresponding transponder 10 ... ADS-B receiver 101 ... Receiving unit 102 ... Value processing unit 103 ... Time management unit ... First time management unit 104 ... Extended squitter processing unit 11 ... TIS-B transmission device 111 ... Information processing unit 111a ... Monitoring data input means 111b ... Extended squitter input means 111c ... Generation means 111d ... Prediction means 111e ... Scheduling means 112 ... Second time management section 113 ... Transmission Management unit 114 ... conversion unit 115 ... transmission unit

Claims (4)

A transmission device that transmits an extended squitter related to an aircraft on behalf of an aircraft to an aircraft equipped with an ADS-B device,
Upon receiving the extended squitter transmitted from the aircraft, an extended squitter processing means for associating the reception time with the extended squitter;
Prediction means for predicting the time at which the device itself newly receives the extended squitter from the reception time associated with the extended squitter processing means;
Schedule means for determining a schedule for restricting transmission of the extended squitter from the own apparatus at a time when the reception of the extended squitter from the aircraft is frequently received using the time predicted by the predicting means;
Transmitting means for transmitting an extended squitter according to the schedule set by the scheduling means;
A transmission device comprising: A transmission having an ADS-B receiving apparatus and a TIS-B transmitting apparatus synchronized with the ADS-B receiving apparatus, and transmitting an extended squitter relating to the aircraft in place of the aircraft to an aircraft equipped with the ADS-B apparatus A device,
The ADS-B receiver is
First time management means for measuring time;
When an extended squitter transmitted from an aircraft is received, an extended squitter that associates the reception time managed by the first time management means with the extended squitter and outputs the extended squitter associated with the time to the TIS-B transmitter Processing means;
With
The TIS-B transmitter is
Predicting means for predicting a time at which the ADS-B receiving apparatus newly receives an extended squitter from a reception time associated with the extended squitter input from the ADS-B receiving apparatus;
Schedule means for determining a schedule for restricting transmission of the extended squitter from the own apparatus at a time when the reception of the extended squitter from the aircraft is frequently received using the time predicted by the predicting means;
Second time management means for measuring time in synchronization with the first time management means;
A transmission means for transmitting an extended squitter according to the time measured by the second time management means and the schedule determined by the scheduling means;
A transmission device comprising: The TIS-B transmitter is
Connected to a radar device that monitors the flight of the aircraft,
When monitoring data relating to aircraft flight is input from the radar device, the input monitoring data is compared with the extended squitter input from the ADS-B receiving device, and generating means for generating an extended squitter for transmission is provided. The transmission device according to claim 2. The scheduling means limits the number of transmissions of the extended squitter during a period when the number of times the extended squitter is received by the ADS-B receiving apparatus is a predetermined number or more, a period during which the number of times the extended squitter is received is another predetermined number The transmission apparatus according to claim 2, wherein a schedule for stopping transmission of the squitter is determined.

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