That's a problem with simple, cheap Doppler radars. Pulse radars are much less jammable and countermeasures against jamming are well understood. A bit of random jitter in the outgoing pulse timing prevents interference from identical systems, as well as synchronization attacks. Military radars have had this since the 1960s.
It does add cost.
LIDAR has the same problem and the same countermeasures. Pulsed LIDAR units should have a few microseconds of random jitter in the pulse timing, too. You can still get a collision, but not multiple consistent collisions in a row, so you know it's noise.
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That's a problem with simple, cheap Doppler radars. Pulse radars are much less jammable and countermeasures against jamming are well understood. A bit of random jitter in the outgoing pulse timing prevents interference from identical systems, as well as synchronization attacks. Military radars have had this since the 1960s. It does add cost.
LIDAR has the same problem and the same countermeasures. Pulsed LIDAR units should have a few microseconds of random jitter in the pulse timing, too. You can still get a collision, but not multiple consistent collisions in a row, so you know it's noise.