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This might be a description of spectrum analysis. In spectrum analysis, we look at a range of radiated electromagnetic energy, and arrange it by frequency. By looking at what is there (and what is not), we can derive a "fingerprint" of sorts that can be compared to known spectral displays. We can thus discover what is generating the given spectrum we are analyzing. This usually applies to visible light and frequencies close to that range of energies. In the world of radio, by applying spectrum analysis in given situations, we can discover where radiated energy from a source is "going" in the spectrum. For instance, a satellite launched by an "unfriendly" nation might be transmitting data across a range of frequencies using spread spectrum technology. By pointing a big antenna at it and looking at the range of emissions, we can see all the things it is transmitting across that range of frequencies. Then we can consider how the signals are being transmitted, and if they are in digital form, we turn on the big supercomputers and see if we can crunch the data to make it into something that makes sense.

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