I'm starting research in radar and compressed sensing, but I’m still building my background in these areas. I’m currently diving into radar, following the book Fundamentals of Radar and Signal Processing by Mark A. Williams.

I don’t have anyone to ask for clarification on some topics, so I have a few questions I’m hoping someone can help with. Any guidance would be greatly appreciated!

Q1. Are unchirping and range compression independent operations, or do they depend on each other? For example, is unchirping used for continuous wave radar, while range compression is specific to pulsed FMCW radar?

Q2. In unchirping, do we transmit a signal, listen for a period of time, record the received samples, and then mix them with the transmitted signal? In this case, should the pulse duration be long enough to ensure some overlap with the maximum designed range?

Q3. I understand that the Doppler effect is typically measured with pulse-to-pulse sampling. However, doesn’t pulse compression disrupt the phase history needed to analyze Doppler shifts?

Q4. If unchirping and range compression are used independently, what are the advantages of using both techniques? Where can I find more detailed resources or papers discussing this?

Apologies for the long post, and thank you in advance for your help! I’m still trying to get my head around some of these concepts, and I really appreciate any insight.

Many thanks!