Comparative spectrum trace method and apparatus for...

Details Comparative spectrum trace method and apparatus for... Comparative spectrum trace method and apparatus for...

2006-06-06

2006-06-06

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S066000, C702S067000, C702S070000

Reexamination Certificate

active

07058530

ABSTRACT:
An improved method and system for detecting covert surveillance devices uses frequency spectrum traces produced by a spectrum analyzer. The electromagnetic spectrum is scanned in a reference area to produce a reference frequency spectrum trace. The electromagnetic spectrum is then continuously scanned in a nearby target area to produce a peak hold frequency spectrum trace. The reference frequency spectrum trace is then subtracted from the peak hold spectrum trace to produce a comparative frequency spectrum trace. Peaks in the comparative frequency spectrum correspond to signals that are unique to either the reference area or the target area or transitory in nature. Statistical analysis is performed on subsequently obtained frequency traces to identify any changes in the frequency traces.

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ISA Website: “Scan Mode Screen,” dated Jul. 26, 2002.
ISA Website: “ECR-3 Smart Scan,” dated Jul. 26, 2002.

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