Maintaining a precise 319 m/s is incredibly difficult because even tiny speed fluctuations would miss the extremely narrow natural linewidth required for resonance. A linear “train” setup would need detailed synchronization and alignment between the moving source and the stationary scatterer.
It could be made practically feasible by mounting the source on the tip of a high-speed centrifuge, which provides a more controlled, stable way to achieve the necessary Doppler shift.