Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1989-07-10
1990-11-06
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
G01S 116, G01S 118
Patent
active
049689827
ABSTRACT:
In the ground-based equipment of a microwave landing system (MLS), a linear array antenna is employed to generate both a scanning guidance beam, which provides azimuthal position data to an incoming aircraft, and a pair of out-of-coverage indication (OCI) beams, which are disposed outside of the sector covered by the scanning guidance beam. For sweeping the guide beam, phase shifts are updated in a linear phase gradient to scan the beam to the right and to the left of the centerline of the antenna. To form the pair of OCI beams, the main lobe of the antenna radiation pattern is directed to one side of the antenna's centerline, outside the normal scanning range, thereby producing a grating lobe on the opposite side of the centerline. Furthermore, a quadratic phase shift function is superimposed upon the linear phase gradient to defocus the OCI beams so as to fill a sufficient sector of space, on both sides of the scanned region, for OCI coverage.
REFERENCES:
patent: 4635064 (1987-01-01), Chisholm
patent: 4677442 (1987-06-01), Enein
patent: 4837580 (1989-06-01), Frazita
Blum Theodore M.
Hazeltine Corporation
Onders E. A.
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