Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1993-10-27
1995-03-07
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342 81, 342157, H01Q 336
Patent
active
053962567
ABSTRACT:
In an apparatus and method for controlling an array antenna including a predetermined plurality of M antenna elements arranged in a predetermined arrangement configuration, beam electric field strengths of a plurality of N beams of transmitting signals are calculated, and then signals representing the calculated beam electric field strengths equal to or larger than a threshold value are outputted. Thereafter, based on the outputted signals, there are calculated a plurality of N weight coefficients for the receiving signals respectively corresponding to the plurality of N beams of transmitting signals, such that a main beam of the array antenna is directed toward an incoming direction of a desired radio wave and also a level of the receiving signal in an incoming direction of an unnecessary radio wave are made zero. Further, based on the calculated plurality of N weight coefficients and a transmitting frequency of the transmitting signals, there is calculated at least either one of a plurality of M amounts of phase shift and a plurality of M amounts of amplitudes for the transmitting signals, and then the antenna elements are controlled in accordance with at least one of the calculated amplitude and phase data, thereby radiating the controlled transmitting signals therefrom.
REFERENCES:
patent: 4996532 (1991-02-01), Kirimoto et al.
patent: 5087917 (1992-02-01), Fujisaka et al.
patent: 5181040 (1993-01-01), Inoue et al.
patent: 5283587 (1994-02-01), Hirshfield et al.
"Characteristics of CMA Adaptive Array for Selective Fading Compensation in Digital Land Mobile Radio Communications", Takeo Ohgane, Oct. 1990; pp. 489-497.
"Null Beam Forming by Phase Control of Selected Elements in Phased Array Antennas", Isamu Chiba et al., Jan. 1991, pp. 35-42.
Kenneth Teitelbaum, "A Flexible Processor for a Digital Adaptive Array Radar"; pp. 103-107, from Proceedings of the 1991 IEEE National Radar Conference; Mar. 12-13, 1991.
Chiba Isamu
Fujise Masayuki
ATR Optical & Radio Communications Research Laboratories
Phan Dao
Tarcza Thomas H.
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