If the relative motion brings the object and the RADAR closer together, the reflected signal will exhibit what kind of frequency shift?

When an object moves towards a radar system, the reflected signal that the radar receives will experience a shift in frequency due to the Doppler effect. This phenomenon occurs because the wavelength of the radar signal is compressed when the object moves closer. As a result, the frequency of the reflected signal increases. In terms of wave mechanics, if the distance between the radar and the object decreases, the returning waves are encountered more frequently by the radar receiver, leading to a higher frequency. This is a fundamental principle behind how radar systems can determine the speed of approaching objects by analyzing frequency shifts in the reflected signals.