Air traffic control and smartphone: what they have in common

1. Step 1. Air traffic control — uses — Radar. Radiolocation.
2. Step 2. Radar — includes — Doppler radar. A radar.
3. Step 3. Doppler radar — has part — Digital signal processor. It picks out the Doppler shift.
4. Step 4. Digital signal processor — is part of — Smartphone. Processing sound and images.

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