Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1997-10-07
1998-11-24
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
342152, G01S 316, G01S 328
Patent
active
058414002
ABSTRACT:
A desired signal is received at first and second antennas. Output signals of the first and second antennas are orthogonal-detected by first and second signal conversion circuits and thereby converted into first and second baseband signals. A complex conjugation circuit generates a complex conjugation signal by calculating a complex conjugation of the second baseband signal. The first baseband signal and the complex conjugation signal are multiplied by a multiplier. A direction estimation circuit estimates a direction of the desired signal by effecting an inverse tangent calculation and an inverse cosine calculation on an output signal of the multiplier.
REFERENCES:
patent: 4532515 (1985-07-01), Cantrell et al.
patent: 5585803 (1996-12-01), Miura et al.
H. Tsuji et al., "Estimation of Direction of Desired Signals Using Cyclostationarity", Technical Report of IEICE, RCS96-77, pp. 77-82, Aug. 1996.
J. Xin et al., "Regularization Approach for Direction of Cyclostationary Signals in Antenna Array Processing", Technical Report of IEICE, RC96-76, pp. 69-76, Aug., 1996.
Blum Theodore M.
Matsushita Electric - Industrial Co., Ltd.
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