There are real receiver architectures being used now in automotive radar mmics as well. However I wonder without phase information how targets are identified if they're moving towards or away? Just Doppler analysis? Could you please elaborate the differences between IQ and real receivers?
3D sensors in infrared use similar approaches. I'm not aware of them using a chirp, though. The schemes aim to optimize in-pixel conversion to distance, which can be done for example by schemes which accumulate before and after zero crossing of amplitude and compare the ratio, to come up with a phase measure.
Generally HPF is just before the IF amplifier to get rid of stronger blocker signal, hence the chirp X which results in Lower frequency IF will get suppressed I think. Can you please elaborate little on that
Depending on the Chirp and generated IF, filter components should be designed not to suppress critical signals. With proper system design, it should be fine and nothing should be suppressed.
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You can also discover the power of Linear Frequency Modulation (LFM) from my recent article https://wirelesspi.com/the-power-of-pulse-compression/
Thanks for sharing!
There are real receiver architectures being used now in automotive radar mmics as well. However I wonder without phase information how targets are identified if they're moving towards or away? Just Doppler analysis? Could you please elaborate the differences between IQ and real receivers?
Phase information is definitely used in radar processing. I’ll write about that too.
3D sensors in infrared use similar approaches. I'm not aware of them using a chirp, though. The schemes aim to optimize in-pixel conversion to distance, which can be done for example by schemes which accumulate before and after zero crossing of amplitude and compare the ratio, to come up with a phase measure.
That’s interesting. I don’t know anything about infrared sensing. I imagine there are clever things people do there as well.
Generally HPF is just before the IF amplifier to get rid of stronger blocker signal, hence the chirp X which results in Lower frequency IF will get suppressed I think. Can you please elaborate little on that
Depending on the Chirp and generated IF, filter components should be designed not to suppress critical signals. With proper system design, it should be fine and nothing should be suppressed.
This deep dive into chirp signals for automotive radar is incredibly insightful for RF and ADAS engineers! The breakdown of how linear frequency modulation enables precise range and velocity detection clears up a lot of core radar signal processing concepts. Working through complex RF signal theory for hours can be mentally draining, so I unwind with a slow, atmospheric browser narrative game during study breaks: browser game: https://thefalsesun.net
Very informative! thanks for sharing.