Which transmission type is best for detecting stationary objects?

The best transmission type for detecting stationary objects is frequency modulation. This method allows for the analysis of the frequency shifts in the signals reflected from objects. When an object is stationary, the frequency of the returned signal remains constant, making it easier to distinguish from moving objects.

Frequency modulation provides a robust way to assess stationary targets because it can exploit the variations in frequency that occur due to the Doppler effect when dealing with moving targets. However, for stationary objects, the lack of frequency change makes them distinctly identifiable. This capability is vital for radar systems that need to monitor conditions without interference from other moving entities or background noise.

While other transmission types like pulse modulation and continuous wave can be effective in various scenarios, frequency modulation is specifically advantageous for static objects due to its ability to maintain signal integrity, even when background clutter is present. Pulsed Doppler can also be useful but is primarily designed to analyze targets with speed, offering limited benefits when it comes to stationary detection.