Which frequency provides better velocity measurement at the expense of range?

Which frequency provides better velocity measurement at the expense of range?

• A. High Frequency
• B. Medium Frequency
• C. Low Frequency
• D. Very High Frequency

Answer: (A)

Velocity measurement in radar relies on Doppler shift, which increases with carrier frequency. For the same target speed, the Doppler frequency shift is proportional to the carrier frequency, so using a higher frequency makes the velocity signal easier to detect and measure precisely, especially in the presence of noise. But higher frequencies also suffer greater free-space path loss and atmospheric attenuation, which reduces the maximum usable range. So you trade some range for better velocity information. Among the options, a higher carrier frequency provides the stronger Doppler signal needed for velocity accuracy, while the range is sacrificed compared to lower frequencies.

Velocity measurement in radar relies on Doppler shift, which increases with carrier frequency. For the same target speed, the Doppler frequency shift is proportional to the carrier frequency, so using a higher frequency makes the velocity signal easier to detect and measure precisely, especially in the presence of noise. But higher frequencies also suffer greater free-space path loss and atmospheric attenuation, which reduces the maximum usable range. So you trade some range for better velocity information. Among the options, a higher carrier frequency provides the stronger Doppler signal needed for velocity accuracy, while the range is sacrificed compared to lower frequencies.