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Universal Signal Detection (Option USD)–classiication by signal externals

Option USD gives the user a flexible and effective toolkit to isolate signals of

interest in complex spectral environments. USD offers three utilities that can be

applied individually or in combination to search and isolate spectrum events of

interest. These utilities are described in the next paragraphs.

Frequency Plan

USD enables creation of a frequency plan for signal types operating on a known

frequency allocation and channel plan. It can also use specified frequency bands

(multiple F1 – F2) for signals that may not appear where they are expected due

to drift, age, quality, or other issues.

Bandwidth Filter

This is used to associate only signals meeting a bandwidth criterion with a spe-

cific USD signal detector. It is a simple, but highly effective approach to parsing

and classifying different types of signals.

Wideband Detector (Spectral shape correlation)

This provides three types of signal detectors (spectral shape correlation, peaks,

and limit lines). These are used to both characterize transmitters and create a

signal detector unique to a spectrum event (see the example below). USD offers

recording with the wideband detector creation tool. Transmitter classification

can be achieved by identifying one or two unique modes or features of the

device turn on.

Application of USD

In many cases, the three USD utilities (frequency plan, bandwidth filter, and

wideband detector) are used in combination to isolate candidate signals of

interest. The USD Monitor Pane displays how effectively each stage of the

USD process is sorting and filtering candidate signals. In many cases, after a

candidate signal passes through USD, it is tasked to Option MR1 for automated

analysis of signal internals.