Combined air surveillance and precision approach radar system

Details Combined air surveillance and precision approach radar system Combined air surveillance and precision approach radar system

1997-06-11

1998-11-24

Lobo, Ian J.

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

Aircraft landing system

Ground control approach

342 37, G01S 1393

Patent

active

058413910

ABSTRACT:
A radar system which time shares the use of a common radar head to perform functions associated with Air Surveillance Radar (ASR) and Precision Approach Radar (PAR) systems, i.e., for respectively displaying information to an air traffic controller useful for tracking an aircraft's approach to an airport and then guiding said aircraft along a preferred glideslope approach to a runway. In accordance with a significant feature of a preferred embodiment, a common radar head is comprised of an azimuth antenna capable of using radar beams to scan, e.g., electronically, a subsidiary scan arc, i.e., less than .+-.90.degree., mounted on a rotational scan apparatus that directs said radar beams within a principal scan arc, a full circle (360.degree.), by continuously rotating, e.g., mechanically, said azimuth antenna at an essentially constant rate. By periodically advancing, preferably electronically, the emission direction of the rotating azimuth antenna, time periods are allocated that can be used to individually permit both ASR and PAR emissions to occur at one or more common rotational positions.

REFERENCES:
patent: 3718988 (1973-03-01), Ball et al.
patent: 3900846 (1975-08-01), Gibbon et al.
patent: 4910526 (1990-03-01), Donnangelo et al.
Brukiewa, TF., "Active Array Radar systems applied to air traffic control", 1994 IEEE MTT-S International Microwave Symp Digest (Cat. No. 94CH3389-4) Pt. vol. 3, pp. 1427-1432, May 1994.

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