Virtual ATCRBS using signals of remote SSR

Details Virtual ATCRBS using signals of remote SSR Virtual ATCRBS using signals of remote SSR

1989-07-13

1990-02-06

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Air traffic control

Secondary surveilance radar

342 32, 364461, G01S 1374

Patent

active

048991562

ABSTRACT:
A virtual secondary surveillance radar (SSR) of the type described in U.S. Pat. No. 4,115,771 can produce inaccurate or indeterminate range information for a transponder positioned near or on a line between the actual SSR and the virtual SSR, owing to unfavorable geometrical relationships. When such condition occurs, the error or ambiquity is resolved by transmitting interrogations from the virtual SSR site toward the actual SSR. The time delay between transmission of an interrogation and reception of a reply to it is a direct measure of the range of the transponder from the virtual SSR.

REFERENCES:
patent: 3875570 (1975-04-01), Litchford
patent: 4027307 (1977-05-01), Litchford
patent: 4115771 (1978-09-01), Litchford
patent: 4196434 (1980-04-01), Funatsu et al.
patent: 4642648 (1987-02-01), Hulland et al.
patent: 4733241 (1988-03-01), Litchford et al.

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