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4. Conclusion
The development of spectrum monitoring and its components - technical analysis of signals, identification of transmitters, listening and analysis of decoded content - is fundamentally linked to that of radiocommunications itself, whether for spectrum monitoring in a civil regulatory context, or for battlefield surveillance in a tactical or strategic military context.
The communication signal analysis techniques required for radio surveillance are becoming increasingly complex and diversified:
the signals to be processed are increasingly varied, versatile and stealthy, properties reinforced by the growing predominance of digital transmissions over analogue transmissions;
signals, especially military ones, are becoming increasingly agile in frequency ;
...
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The Ultimate Scientific and Technical Reference
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