How a radar PPI shows the difference between a missile and a plane?

i know digital radar systems have a monitor for operators that even shows missile or planes with icons; but my my question is how older analog circled PPIs (such as the one in TOR-M1 system) will show the difference between targets ro operator? as it is known that systems like tor m1 can actually detect wide range of targets

Update:

as we know targets will appear as "Dots" in PPI so is there a difference like bigger dots and smallers or something like that?

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  • 1 month ago

    Speed would be a dead giveaway. Old transponders, at least for the military, had an IDENT switch on it. Any time the radio mic is keyed, it puts an additional pulse on the display if the switch is set to the MIC position. Or, the IDENT switch could be pushed to give the additional pulse train for 30 seconds. 

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  • 1 month ago

    By observing a change in position between sweeps, an operator can estimate speed.  Since most missiles have little or no wings, they must fly faster than airplanes.

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