Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1993-07-21
1994-10-25
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
342195, G01S 316, G01S 328
Patent
active
053593332
ABSTRACT:
A system and method for estimating the number of emitters having wavefronts impinging on an array of m sensors may be used in the presence of correlated, unequal-level, as well as uncorrelated, equal-level noise. In the invention, the m eigenvalues of the sensor correlation matrix are evaluated to determine whether they are related to noise or to signals. Each eigenvalue, scaled by the estimated noise power level, is compared to the arithmetic mean of the preceding noise eigenvalues to determine whether the difference is enough to indicate the presence of a signal. Similarly, the successive slopes (differences between each scaled eigenvalue and its predecessor) may be compared to the arithmetic mean of the preceding slopes to make the determination. In an alternative embodiment, the eigenvalues are desensitized by increasing each by an amount not much larger than the first noise eigenvalue. The invention finds application in existing systems that use an eigenstructure approach to determine various characteristics of the signals forming the impinging wavefronts.
REFERENCES:
patent: 3725922 (1973-04-01), Brennan et al.
patent: 4641259 (1987-02-01), Shan et al.
patent: 4931977 (1990-06-01), Klemes
patent: 5255210 (1993-10-01), Gardner et al.
patent: 5262785 (1993-11-01), Silverstein et al.
Blum Theodore M.
E-Systems Inc.
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