Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-03-27
1977-10-18
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
340 1R, 343100CL, 350162SF, G01S 906, G01S 968, G02B 522
Patent
active
040548783
ABSTRACT:
An improved apparatus for the formation of directional characteristics at the receiving end of a ranging system operating according to the reflected-beam ranging technique with acoustical or electromagnetic waves and for correlating the received signals, which apparatus is of the type employing a number of transducers arranged in rotational symmetry in a transmitting-receiving plane, with the transducers emitting pulse-shaped wave energy as their transmitted signals and being connected for reception via a transmitting-receiving switch, and if required via amplifiers, with a scanner which repeatedly interrogates the received signals in succession during one reflected-beam ranging period so that each switch position of the scanner is associated with one directional angle and each interrogation cycle covering all transducers is associated with one directional angle revolution. According to the invention, connected to the output of the scanner is a two-dimensional device for producing a lightwave with an intensity or phase distribution dependent on the directional angle in the one dimension and dependent on the time of reception of the received signals within each ranging period in the other dimension, whereby the wavefront of the produced lightwave is modulated by the successively scanned received signals. This modulated lightwave is fed to the input of a two-dimensional optical correlator, which contains, as the reference function of the correlator, a reference disc with a transmission function which is a measure for the directional characteristic for a transmitted signal received without interference from a reference direction, and the output of the optical correlator is fed to a two-dimensional display device.
REFERENCES:
patent: 3519331 (1970-07-01), Cutrona et al.
patent: 3526893 (1970-09-01), Skenderoff et al.
patent: 3579180 (1971-05-01), Taddeo
patent: 3787840 (1974-01-01), Dotson
patent: 3790926 (1974-02-01), Pekau
patent: 3794406 (1974-02-01), Kock et al.
patent: 3810082 (1974-05-01), Arens
"Syntheses of Optimum Complex Spatial Filters" by F. T. S. Yu et al., Journal of the Optical Society of America, vol. 62, No. 1, Jan. 1972, pp. 147-149.
Fried. Krupp Gesellschaft mit beschrankter Haftung
Hubler Malcolm F.
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