Apparatuses and method involving diagnostics of radar circuitry

In one example, a continuous-wave radar circuit receives reflection signals, computer processing circuitry processes data corresponding to the reflection signals, and emulation circuitry introduces a plurality of diagnostic data sets into the radar circuit to cause the radar circuit to process simulated reflection signals as though the simulated reflection signals are reflections from objects remote from the apparatus. The radar circuit may receive the reflection signals in response to chirp sequences actually transmitted as reflections from objects.