What is FMCW Radar and why is it useful?
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- Опубликовано: 29 сен 2024
- This video goes over range estimation with FMCW radar and gives a little insight into why you might want to use it over a traditional pulsed radar.
There are many more trade-offs between the two that I don't discuss here, but this should give you a basic understanding of the technology.
I'll use this as a basis for future videos on FMCW radar. There is a ton to cover and I'm excited to dive into those animations and explanations!
Who is this for?
Well, anyone interested in radar, but I did make a few assumptions about the viewer's background including a basic understanding of math and knowledge of what an electromagnetic wave is.
Some of the many resources I used when learning about this:
- Jon Kraft's series on FMCW radar hardware and software (Analog Devices) ( / @jonkraft )
- Small and short range radar systems (book) (www.amazon.com...)
- The phaser FMCW radar platform (ez.analog.com/...)
- Radar Basics: How to Build a 24 GHz FMCW Radar System - Alex Andrews (Analog Devices) (www.analog.com...)
- Frequency-Modulated Continuous-Wave Radar (FMCW Radar) - radartutorial.eu (www.radartutor...)
Some of the caveats to the information presented in this video:
- Pulsed radars often transmit more complex waveforms than a simple sine wave (e.g., pulse compression)
- FMCW radars often also have some "off" time between chirps
- FMCW radars will many times transmit a series of chirps then combine them in post-processing into a coherent processing interval (CPI)
- See the next video on velocity estimation :)
- Not all power is reflected from the target but it is instead scattered in many directions
All animations shown were created using Manim Community (docs.manim.com...) - a Python animation library written by 3Blue1Brown ( / @3blue1brown ) and maintained by the community. Huge thanks to everyone working on this incredible project!
Code for the animations can be found on my GitHub: github.com/bru....
Errata:
- I probably should have labeled the time shift from transmission to reception as t_{shift} and not t_{0} for clarity and parity with the upcoming video on the hardware implementation.
- "Keyring" should be "keying"
#somepi #manim
Amazing video, thanks for putting it together! Please do more if u can!
Definitely! I'm working on the follow-up to this now! Thanks so much for watching!
Very cool video! 1:48 That's also why pulsed lasers are able to to ablate material while being "only" 2W of average power
yeah I mean 2W at 10% duty cycle or less is quite a bit!
incredible video! the animations really did help at explaining the concept very clearly. This should have, at least, 100k views!|
@@miqueasgsw6818 thank you so much! Glad it helped 😊
one of the better #some4 videos ive seen for sure!
@@bean_TM thanks so much for your comment and watching!
> FMCW radars often also have some "off" time between chirps
That would not be FMCW, but FMOP.
Yeah! This was a super basic intro to the technology so I didn't cover that, but yes there definitely is a gap many times - I included this in the caveats section of the description :) Thanks for watching!
Nice! I would say that at 5:40 "beat" is better described as the difference in frequency between two signals than as the difference in frequency of one signal at different times.
Thanks for the suggestion! Definitely happy to take any and all constructive criticism as I want these to be really helpful. Thanks for watching!
can you explain at 1:53 why we want to have a greater desired power ?
@@RUDRARAKESHKUMARGOHIL yeah! This isn’t always the case (for example automotive radar sometimes) but you want to increase average output power because the signal you transmit degrades as it travels through the air. So if you transmit a higher power, you can see farther distances in general. Hope this helps and thanks for watching!
Ya it helped ! I left the video till the doubt get solved 😅 but will see it completely now...
amazing video, can you design FMCW radar?
@@TuralMontin-w9k I’m actually currently working on a video going into many of the blocks used when designing an FMCW system!
@@MarshallBrunerRF thanks , I'm looking forward to it. I subscribed to you.