Communications: directive radio wave systems and devices (e.g. – Determining distance – With pulse modulation
Patent
1996-10-29
1998-06-23
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With pulse modulation
G01S 702
Patent
active
057710147
ABSTRACT:
In a transmission mode, one repetition transmission pulse generated by a transmitter is divided into a plurality of subpulses having different frequencies by a variable distributor. The subpulses are assigned to a plurality of elevation angle directions by phase shifters, and the assigned subpulses are transmitted from an antenna device. In a reception mode, the reflected signals of the subpulses transmitted in the range of the plurality of elevation or inclination angles are captured from this range by the antenna device. The captured signals are simultaneously received by a plurality of receivers and EL synthesis units. The number of reception channels is set equal to or larger than the number of transmission subpulses. Each reception channel is controlled on the basis of the reception elevation angle range calculated by an arithmetic processing unit such that the corresponding reception beam covers a wider elevation angle range for a short range, and the elevation angle range is narrowed with an increase in range. By this processing, both uniformity of a sensitivity in an entire coverage and an increase in sensitivity at a coverage end which tends to be short in sensitivity due to reception antenna pattern control can be realized.
REFERENCES:
patent: 3885237 (1975-05-01), Kirkpatrick
patent: 4649390 (1987-03-01), Andrews et al.
patent: 5138323 (1992-08-01), Taylor, Jr.
Kabushiki Kaisha Toshiba
Pihulic Daniel T.
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