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How automotive radar measures the velocity of objects
How to design the perfect chirp signal for distance and velocity measurement.
The multiplicative mixing process between transmitted and received chirps not only results in a constant beat difference frequency, but it also does something to phase. The time between two consecutive chirps is called the pulse repetition rate (PRT), and plays a key role in the accuracy of doppler velocity estimation. Looking at this table closely helps us understand how the choice of chirp parameters affects what the radar system is capable of doing, and puts into practical terms all the trade-offs we have discussed in the last article and this one, regarding range and velocity measurement.
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