Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means
Patent
1992-01-29
1993-06-08
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
By magnetic means
324 72, 324326, 324244, 328167, G01V 308, G01V 338, G01V 340
Patent
active
052183009
ABSTRACT:
The detector elements are sensitive to the target presence in their respective vicinities and are distributed in the surveillance zone. First differences (S1-S2, S3-S2, S4-S2) are formed from outputs of the detector elements taken pairwise, and at least one other first difference (S3-S2, S4-S2) previously filtered in a filter (213, 213') is subtracted from each first difference (S1-S2) to form a second difference, where said filter is controlled to minimize the value of the second difference in the absence of a target, and the second differences so obtained are used (216) to detect the target. In particular the invention applies to detecting submarines using magnetometer buoys.
REFERENCES:
patent: 3490032 (1970-01-01), Zurflueh
patent: 3808519 (1974-04-01), Lemercier et al.
patent: 4277771 (1981-07-01), Chapin et al.
patent: 4766385 (1988-08-01), Polvani
McAulay, "Computerized Model Demonstrating Magnetic Submarine Localization", IEEE Transactions on Aerospace and Electronic Systems, vol. AES-13, No. 3, May 1977, pp. 246-254.
Sextant Avionique
Strecker Gerard R.
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