Drone Tracking Radar: Part 6 Range Doppler
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- Опубліковано 17 чер 2024
- This is the 6th video in the DIY radar project. In this video,
0:00 -- Introduction
0:26 -- Multiple FMCW Chirps
2:33 -- Range Doppler Plot
3:45 -- Python Program
4:22 -- Street Demo
6:59 -- Drone Radar Setup
7:30 -- Output Power Measurement
9:11 -- Drone Radar
9:55 -- Radar Data Cube
11:28 -- Future Videos
Please post all requests for technical support here:
ez.analog.com/adieducation/un...
Here are the links used in this video:
Phaser: wiki.analog.com/phaser
Radar Software: github.com/jonkraft/PhaserRad...
UA-cam Playlist: • Build Your Own Radar
Pluto and PYSDR-IIO getting started:
• Enable Dual Receive an... - Наука та технологія
I can't wait for the phased array series! W00t
Turbine and propeller modulations are part of the radar target processing on Air Defense Radars. You can see Russian Bear bomber propellers at max Doppler range. The bomber itself needs to get closer before the Doppler tracker locks-on to it. But we also had pulse radar that saw the bombers if they were high enough (Beyond the Horizon) at twice the range of the Doppler radar.
Not gonna Lie. _This is actually fascinating_
a really good, real life example of tech , physics & math in *Practicality*
as someone who worked on radar for a short while, i am blown away with this project. i would be shocked if you're not snapped up by some defence contractor. or maybe that's how you got your knowledge? hehe
it's pretty cool that a little diy radar is sensitive enough to detect a drone by the micro-doppler reflections of the drone's plastic rotors
Looking forward to the next video.
Got hooked. Will watch the whole series now.
Many thanks! So interresting. Theorical papers are easy to found. It is easy to build basics doppler low cost radar. Here, I discover the power of array and chirp in doppler.
Great Videos!!! Can't wait the phased array series.
Ah, a fellow Terre Haute escapee. Congrats! I worked at ICTT in the 80s, and was on air at WMHD a few weeks.
Just found your channel and I love the easily understandable, but still very technical style of explanation. This is super cool knowledge that I love having, thank you for teaching!
10 seconds and I subscribed.
Best series on practical radar fundamentals around. Can't wait for season 2! It has been super helpful to take the Phaser from a bit of complex hardware to useful experimentation.
This series is awesome!
This is such great work! Thank you so much for sharing!
Looking forward to your phased array series, it is probably one of the coolest applications of signal processing, RF electronics and EM theory I know of!
This has been an excellent series. Great informative content in nicely sized episodes.
Really look forward to the phased array series.
Seeing additional vertical bars in "street demo" range vs. velocity plot at 3.75, 7.5 m/s either side of 0 m/s suggests 1/2 and 1/4 wavelength interference, or is it an artifact of the FFT?
The street demo really brought all the pieces together. Can see a number of ways to modify parameters, and software to experiment in different ways. Thanks for sharing.
Great series it videos. I built a few FMCW back in grad school (1995) and we used YIG oscillators to get the bandwidth. Amazing that can be done in a couple of chip these days.
I love these videos!
Love you videos. Thanks for sharing!
I just discovered this channel, instantly subscribed. Thank you for making these educational videos, I now have a bit of a backlog to work through.
thanks for your time and effort
Excellent work
I love this wow. The algorithm works in my favor. Sub.
Love these videos. I've never had the chance to study or play with radar, but having a background in electronics and maths it's still super easy to follow.
fantastic explanation
Can't wait for the beamforming application!!
Very very interesting!
Amazing thanks!
Great video!
this is amazing.. tyvm
So cool. I wish i could afford the parts to build my own
The Pulse Doppler radars I worked on all had the closing velocities on the right of the clutter notch, and opening on the left.
Wow! Thanks!
nice work
ขอบคุณมากครับ
I'm very you are doing well with this extremely niche kind of subject.
Is it possible to use this solution to hunt drones (e.g. intercept) in the air? All the types of drones - FPV, Shakhed and the reconnaissance ones.
Extreme
thanks very very cool work
is that the range ? 40m
for a bigger target say 10x bigger, of size 200cm,
how far out should you be able to see it on top of the noise,
and will the speed of the target effect its radar profile ?
This may sound like an insane question, but is there radar sensitive enough to both detect a mosquito at relatively near distance, but positively identify it due to counting the microdoppler of its wings beating at a certain hertz?
Great series!
Is this phased array radar limited to 40 meters range? What is needed to detect range and speed of an object at 400 meters or more?
Thanks! Assuming you mean improve range to 400m to see this small 249g drone. Two things need to be improved: improve the hardware and improve the signal processing. Hardware can be improved via that range equation from the first video. i.e. more Tx power, more directive antennas, etc. Signal processing is things like MTI, clutter suppression, integrating pulses, etc. Lots could be done on both of those ends. I'm just showing the concepts and a minimum working example. It would take non-trivial work on both hardware and software to get a reliable target at 400m.
@@jonkraft Thanks for the reply. Your videos are popular both among my friends in FAANG and miltech developers in Ukraine making all kinds of stuff including phased array radars. Drones are a serious issue as you may know. And it is getting worse with addition of machine vision. I'm mean not only here, it is a global security issue. Personally I'm building an acoustic array to help defend our skies and more or less know its possibilities from simulations and early prototypes. Hope to finish a full scale prototype this summer and try it out on a test ground to help counter Iranian suicide drones Shaheds. Good luck with your series!
@@KostiantynKostin Thanks again. I really like the idea of acoustic arrays, I think that has a lot of merit for drone detection. Glad you are supporting Ukraine with this.
You have a busy street
Mimicking is easy. What books should I read, to properly un derstand that, and be able to tweak and adjust as I want?
Antennas, amplifiers, dsp,...
Any university library will have all you need. Also look at IEEE article titles, and have the librarian get you a copy of the paper. You can't afford the books. They have an academic tax on them. Just look at them in the library, and copy the pages of interest with your hand scanner.
So you have nine bins on the Fast Time axis, separated by the sampling rate of the data convertor, something like microseconds. Is there one ADC reading in each bin? 8 bins is enough for an FFT, but do you really have a lot more?
Right, with modern data converters its very easy to get thousands of samples. I think this data was a couple thousand complex (IQ) data points per chirp.
I think the drawing is simplified. Your going to have say 1024 time samples to give 1024 FFT frequency samples per range scan to give Doppler resolution. Triangle waves are not as good as sawtooth waves. The abrupt return to min frequency is a discontinuity.
Can I synchronize a few cheap SDRs with some external clock, to extend the antenna array without selling a kidney?
see the Kraken SDR
Is it possible to use the radar to calculate the rotation speed of the propellers of the drone?
Probably not the speed, as the blades are horizontal to the radar view, but the faster the rotation, the wider the blade Doppler is from the target Doppler. The blade tips are much faster than the RPM of the propeller.
Thanks. I guess I should’ve ask if you could calculate the rpm of the blades. But I think you kind of answered that.
Okay but your not measuring the actual Dopplershift right? Or am I missing something. And if that's true why is it then still called Doppler when it would be more accurate to say radial velocity.
In an earlier part of the series, it was suggested that pauses in the frequency modulation ramp, where the frequency is held constant, would be good places to look for Doppler shifts. If the picture at 0:51 is correct, this wasn't done. I guess if things work out, you could have two beat frequencies: one for Doppler at a particular frequency and one for the range.
@@johnschindler9641 ah okay thanks, didn't remember that part.
Only read the title.
1st thought, "DON'T TELL THE RUSSIANS!"
how many ukrainians are watching this
None, they are busy stealing us and European Technology
as much as russians
Na, it's the Americans Germans French and ***'s that are constructing the devices and conducting the experiments. The ukrainians and russians are just the testing medium
Ukraine is a corrupt hole
@@vihtormch7512true)
Yeah. Let's low key help Ruzzians right now. Great job... -.-
It's too expensive. Why can't I use a starlink for this?
Starlink is $100 a month. It only knows the IP protocol.
This is begging for neural network processing in order to identify signatures.