Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1985-02-11
1987-03-24
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342373, H01Q 322, H01Q 326
Patent
active
046528792
ABSTRACT:
A phased array antenna system capable of scanning at rates faster than the information rate of signals being received to prevent the loss of information during the scanning process. The phased array is configured to add the capability to provide multi-dimensional separation of multiple signals to enable measurement of direction of arrival and frequency, and to eliminate the sensitivity loss due to sampling usually encountered with such rapid-scan systems. The array antenna system is comprised of the means to form multiple, time-sequenced responses, each response corresponding to a different beam of sensitivity. The beams scan the full coverage sector and together with each other form a contiguous set of beams that both fill the coverage sector at any one time and also synchronously scan the full coverage sector. The beams are differentially delayed to permit the beam responses from any particular incident signal to be added in unison, giving rise to a compressed pulse whose time of occurrence is related to the signal angle of incidence. The means for beam addition selectively forms a coherent sum at only one of its multiplicity of output ports, the particular port being a periodic function of the signal frequency. The ambiguities which arise in frequency resolution and frequency measurement capability due to this periodicity are resolved by coarse frequency channelizers. This arrangement retains the wide-open angular reception characteristics of a wide-beam or omnidirectional antenna, while exhibiting the gain and angular resolution of a multi-beam phased array antenna, and the frequency resolution of a channelized receiver.
REFERENCES:
patent: 3631503 (1971-12-01), Tang et al.
patent: 4277787 (1981-07-01), King
Hall Scott F.
Rudish Ronald M.
Blum Theodore M.
Eaton Corporation
Issing Gregory C.
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