Secondary surveillance radar system, and ground system for use therein

• US 20060181447A1
• Filed: 09/13/2005
• Published: 08/17/2006
• Est. Priority Date: 09/15/2004
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Aoki, Yoshirou, Kuji, Yoshinori, Ootomo, Hisashi
• Granted Patent: US 7,663,531 B2
• Time in Patent Office: Days
• US Class Current: 342/32
• CPC Class Codes: G01S 13/782 using multimoding or selective addressing
• CPC Class Codes: G01S 13/784 Coders or decoders therefor; Degarbling systems; Defruiting systems

Abstract

A secondary surveillance radar system comprising a ground system which observes an observation area where an aircraft equipped with a mode S transponder and an aircraft equipped with an ATCRBS transponder possibly coexist, wherein the ground system comprises a transmit processor which transmits to the observation area an all-call interrogation signal specific for mode S including an identification code of the ground system, a receive processor which receives a reply signal to the interrogation signal transmitted by the transmit processor, and a recognition processor which recognizes the reply signal as a processing target when identification information included in the reply signal received by the receive processor coincides with the identification code of the ground system, and wherein the recognition processor recognizes the reply signal as the processing target also when the identification information included in the reply signal received by the receive processor coincides with null information.

Claims

1. A secondary surveillance radar system comprising a ground system which observes an observation area where an aircraft equipped with a mode S transponder and an aircraft equipped with an ATCRBS transponder possibly coexist,

wherein the ground system comprises:

a transmit processor which transmits to the observation area an all-call interrogation signal specific for mode S including an identification code of the ground system;

a receive processor which receives a reply signal to the interrogation signal transmitted by the transmit processor; and

a recognition processor which recognizes the reply signal as a processing target when identification information included in the reply signal received by the receive processor coincides with the identification code of the ground system, and

wherein the recognition processor recognizes the reply signal as the processing target also when the identification information included in the reply signal received by the receive processor coincides with null information.

2. The secondary surveillance radar system according to claim 1, wherein the null information corresponds to a numerical code “

0”

.

3. The secondary surveillance radar system according to claim 1, wherein the recognition processor gives distinguishable distinction information to the reply signal in which the identification information coincides with the identification code of the ground system and to the reply signal in which the identification information coincides with the null information.

4. The secondary surveillance radar system according to claim 1, further comprising:

a switch processor which selectively switches to validate/prohibit a function performed by the recognition processor to recognize the reply signal in which the null information is described.

5. A secondary surveillance radar system comprising a ground system which observes an observation area where an aircraft equipped with a mode S transponder and an aircraft equipped with an ATCRBS transponder possibly coexist,

wherein the ground system comprises:

a transmit processor which transmits to the observation area an interrogation signal including an identification code of the ground system; and

a receive processor which receives a reply signal to the interrogation signal transmitted by the transmit processor, and

wherein the transmit processor changes transmission patterns of the interrogation signal every all-call time period.

6. The secondary surveillance radar system according to claim 5, wherein the transmit processor changes a combination of an all-call interrogation signal specific for mode S, an all-call interrogation signal specific for mode A and an all-call interrogation signal specific for mode C every all-call time period.

7. A ground system for use in a secondary surveillance radar system which observes an observation area where an aircraft equipped with a mode S transponder and an aircraft equipped with an ATCRBS transponder possibly coexist, the ground system comprising:

a transmit processor which transmits to the observation area an all-call interrogation signal specific for mode S including an identification code of the ground system;

a receive processor which receives a reply signal to the interrogation signal transmitted by the transmit processor; and

a recognition processor which recognizes the reply signal as a processing target when identification information included in the reply signal received by the receive processor coincides with the identification code of the ground system, and

wherein the recognition processor recognizes the reply signal as the processing target also when the identification information included in the reply signal received by the receive processor coincides with null information.

8. The ground system according to claim 7, wherein the null information corresponds to a numerical code “

0”

.

9. The ground system according to claim 7, wherein the recognition processor gives distinguishable distinction information to the reply signal in which the identification information coincides with the identification code of the ground system and to the reply signal in which the identification information coincides with the null information.

10. The ground system according to claim 7, further comprising:

a switch processor which selectively switches to validate/prohibit a function performed by the recognition processor to recognize the reply signal in which the null information is described.

11. A ground system for use in a secondary surveillance radar system which observes an observation area where an aircraft equipped with a mode S transponder and an aircraft equipped with an ATCRBS transponder possibly coexist, the ground system comprising:

a transmit processor which transmits to the observation area an interrogation signal including an identification code of the ground system; and

a receive processor which receives a reply signal to the interrogation signal transmitted by the transmit processor,

wherein the transmit processor changes transmission patterns of the interrogation signal every all-call time period.

12. The ground system according to claim 11, wherein the transmit processor changes a combination of an all-call interrogation signal specific for mode S, an all-call interrogation signal specific for mode A and an all-call interrogation signal specific for mode C every all-call time period.