# US 7,746,268 B2 · Mode S secondary surveillance radar

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- Number: US 7,746,268 B2
- Document ID: US7746268B2
- Status: Granted
- Kind: B2
- Application number: 12/180,713
- Filed: 2008-07-28
- Published: 2009-04-02
- Granted: 2010-06-29
- Earliest claimed: 2007-09-27
- Assignees: Kabushiki Kaisha Toshiba
- Inventors: Masami Ino
- Web page: https://patentgrep.com/patent/US7746268B2

## CPC

- G01S 13/782: {using multimoding or selective addressing}
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A transmitter (13) operates in an immediate scan after an initial acquisition or detection of an altered aircraft ID by a changed flight status, to transmit to an aircraft a sequence of interrogation signals requesting an aircraft ID transmission, a verifier (17) operates upon acquisition of a reply signal including an aircraft ID transmitted from a transponder on the aircraft, to store in a memory (17a) a mode S address assigned to the aircraft and the aircraft ID in an associating manner, and upon an occurrence of a storage of aircraft IDs associated with the mode S address in the memory (17a), to determine whether or not the aircraft ID is correct, depending on whether or not the aircraft IDs have a match therein, and a report generator (18) operates upon a determination for the aircraft ID to be correct, to prepare a target report using the aircraft ID.

## Claims

### Claim 1

A mode S secondary surveillance radar for detecting aircraft flying in an airspace under surveillance, comprising:
a transmitter adapted in an immediate scan after one of an initial acquisition and a detection of an altered aircraft ID by a changed flight status, to transmit to an aircraft a sequence of interrogation signals requesting an aircraft ID transmission;
a verifier adapted upon an acquisition of a reply signal including an aircraft ID transmitted from a transponder on the aircraft, to store in a memory a mode S address assigned to the aircraft and the aircraft ID in an associating manner, and upon an occurrence of a storage of aircraft IDs associated with the mode S address in the memory, to determine whether or not the aircraft ID is correct, depending on whether or not the aircraft IDs have a match therein; and
a reporter adapted upon a determination for the aircraft ID to be correct, to prepare a target report using the aircraft ID.

### Claim 2 (depends on 1)

The mode S secondary surveillance radar as claimed in claim 1, wherein the verifier provides a determination for the aircraft ID to be correct, as the aircraft IDs associated with the mode S address in the memory have been continually acquired from the aircraft and match full.

### Claim 3 (depends on 1)

The mode S secondary surveillance radar as claimed in claim 1, wherein the verifier provides a determination for the aircraft ID to be correct, as the aircraft IDs associated with the mode S address in the memory comprise three or more aircraft IDs having a match between more than half thereof.

### Claim 4 (depends on 1)

The mode S secondary surveillance radar as claimed in claim 1, comprising:
a scheduler adapted upon a failure of the verifier to determine a correct aircraft ID from aircraft IDs acquired in a scan, to have the transmitter transmit an interrogation signal to additionally acquire an aircraft ID from the aircraft in the scan; and
the verifier providing a determination for an aircraft ID to be correct from a combination of an aircraft ID acquired in the scan and an aircraft ID additionally acquired in the scan.

### Claim 5 (depends on 1)

The mode S secondary surveillance radar as claimed in claim 1, comprising:
a channel management adapted upon a failure of the verifier to determine a correct aircraft ID from aircraft IDs acquired in a scan, to have the transmitter transmit an interrogation signal to additionally acquire an aircraft ID from the aircraft in a subsequent scan; and
the verifier providing a determination for an aircraft ID to be correct from a combination of an aircraft ID acquired in the scan and an aircraft ID additionally acquired in the subsequent scan.