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.
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.
Very informative! thanks for sharing.