Virtual secondary surveillance radar using signals of remote SSR

Details Virtual secondary surveillance radar using signals of remote SSR Virtual secondary surveillance radar using signals of remote SSR

1991-01-07

1992-08-18

Barron, Jr., Gilberto

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

Air traffic control

Secondary surveilance radar

342 42, 342465, G01S 1380, G01S 512

Patent

active

051403285

ABSTRACT:
A virtual secondary surveillance radar (VSSR) of the type described in U.S. Pat. No. 4,115,771 can produce inaccurate or indeterminate range information for a transponder positioned on or near a line between the actual SSR and the VSSR, owing to unfavorable geometrical relationships. This can be avoided by receiving the SSR interrogation and reply signals at two or more separated locations and processing the signals to provide positional information at a display site. No radar transmissions other than those of the existing ATCRBS are required.

REFERENCES:
patent: 2515332 (1950-07-01), Budenbom
patent: 4115771 (1978-09-01), Litchford
patent: 4733241 (1988-03-01), Litchford et al.
patent: 4789865 (1988-12-01), Litchford
patent: 4899156 (1990-02-01), Litchford et al.

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