Your intuition  doesn't fail you. Radar systems were developed before computers, and early radar systems did not require computers to function. However, the ability to process radar signals and display them on a screen has greatly improved with the advent of digital computers.

Early radar systems used cathode ray tubes (CRTs) to display the radar data. The radar operator would observe the CRT and use it to identify objects in the vicinity of the radar. Later on, radar systems started using computers to process the radar signals, which allowed for more advanced signal processing techniques and more sophisticated displays. Today, most radar systems still use a combination of analog and digital components, but the data processing and display components are almost always digital.

So, while it's not strictly necessary to use a computer with a radar system, the computer greatly enhances the capabilities of the radar and allows for more sophisticated data processing and display.
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