The first order effect (distance) is the difference frequency. The second order effect (velocity) is the change in frequency. Noise (SNR, distance to the ball

The first order effect (distance) is the difference frequency. The second order effect (velocity) is the change in frequency. Noise (SNR, distance to the ball, aperture) will determine how well this works, since too much integration could muddy the signals. It’s worth a try! Good luck.