Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1979-06-21
1982-01-26
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 332
Patent
active
043131174
ABSTRACT:
From an antenna array of a plurality of fixed, narrow beamwidth antennas, geographically oriented to provide omnidirectional coverage, first and second sets of antennas are selected in sequence. The first selected set includes several pairs of oppositely oriented antennas. The signals received by the antennas in each pair of the first selected set are combined and each of the combined signals is connected to a different one of a number of matched receiver channels. If the logarithmic video output signals from the receiver channels meet certain rules of acceptance, the monopulse ratio, formed by subtracting the outputs of the channels receiving the strongest and next strongest signals, is digitized and stored. This ratio represents the angular difference between the direction of the received signal and the direction of one of the antennas in the pair of the first set generating the strongest signal. However, it cannot be determined which of the antennas in the pair has the forelobe response and, thus, the ratio contains a 180.degree. ambiguity. To resolve the ambiguity, a second antenna set is selected to include only the pair of the first selected set which were connected to the channel receiving the strongest signal. Each antenna in the second set is connected to the input of a different channel, the outputs of which are compared. The stronger signal is considered to be the forelobe response, and information relating to the sector of the antenna with the stronger signal is used to resolve the ambiguity present in the stored ratio.
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General Instrument Corporation
Hubler Malcolm F.
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