Doppler Radar Explained | How Radar Works | Part 3 

Great stuff, Mike. In a future video, you may also want to touch on JEM.

HI thank you for this but it is worth to mark couple of mistakes made. 5:11 You are mixing aliasing with PRF here. You cannot send "pulses". All what all radio system does is using are waves. A pulse of any kind is very long compared to wave length (several thousand cycles at best). A "Dirac delta" signal which you are trying to explain here has unlimited frequency response. This part is very badly described. The "blind spots" as you call them are from "ground clutter" and "side lobe clutter" Doppler filtering (both separated by ~ 100kts in terms of contact speed). They have nothing with aliasing which is domain of signal sampling (namely the Nyquist theorem), not reflection aliasing as you are referring to this as well. Namely PRF also has nothing to do with signal aliasing. Explaining PRF with some strobes superimposed on sinusoid is making impression that you can send "Dirac delta" kind of signal. This is very confusing. You always sending chirps or continuous wave pings and those are couple of thousands cycles long compared to base frequency. Or you send waveform with multiple frequencies in newer radars (spectrum to be processed). PRF only changes the resolution of the radar plus influence on range as it packs more energy. The DCS'ism for PRF (like in Mig-29 of F-14) is just stupid and unrealistic. Higher PRF just limits your range because you send less energy with shorter pulses plus the echo can overlap with next pulse. This though is totally solved by signal coding in new radars. Those pulses though are ~ hundred of microsecond long composed by set of frequencies (or chirp in compression methods).

The best radar tutorials I've ever found on the internet. Great video!

Great video, love the way you explain really complicated matters on a very understandable and easy way. Thank you. 👌

Well, let me tell you, RU-vid is doing a terrible job. I've been watching these DCS videos about tactics and all the in-depth stuff for a long time and this is the first time I'm seeing your channel being recommended. Great video. Thanks.

I want to keep saying that I am really enjoying these videos! I’ve always been super interested in RF and microwave engineering, and subsequently how radars work. This really helps me get closer to that goal.

This playlist cleared up a lot. Are you still planning to continue the series? I looked around your other videos (which are great, btw) but didn't see any more like these. Thanks for the help.

You deserve more views

Great information. At approximately 06:57, the graph showing Unambigious Range and Unambigiuous Velocity has an intersection point. Does this point have a name or is it less useful that I think it is? My assumption is that this would be the best PRF setting to use but there might also be more to it than that.

If the ground were actually spinning in a manner described by so-called science and popular opinion, the velocity of that movement would vary, almost infinitely when speaking in terms of milliseconds, depending on the location between the equator, which would be moving at approximately 1,040 mph and either pole which would be moving much, much slower. So, I’m left to ask, how can the radar equipment possibly factor in and then filter out returned echoes that match the velocity of earth’s rotation when that number is not fixed in the first place? Additionally, is there some sort of technology built into the radar unit itself, which in addition to determining the time that it took for an echo to return, also identifies what specific angle or direction that the signal was returned from? In other words, can Doppler radar identify the directional source of a returned signal? My understanding is no. If I am wrong, and you are willing, please walk me thought it and help me understand how because I don’t believe Doppler radar would be possible on a spinning ball and that’s not even considering the fact that we are told it is moving in found different directions simultaneously, all at speeds that are virtually impossible to comprehend. Thanks in advance and cheers!

Do you plan on making any videos about BVR combat?

Thank for the physical explanation, waiting for the new videos :)

So interesting, thank you for putting this together !

I just discovered you today, and now you're already one of my favorite aircraft-tech youtubers! Keep up doing a great job!

As a Patriot missile operator I've been trying to find unclassified material to help my students understand radars, and these videos are perfect.

Awesome Mike, an absolute great explanation of the doppler, thanks. Greetings Milan

The Avro Arrow used Doppler Radar in 1958.

Great explanation. Still waiting on that stealth video! You earned a sub for sure.

I watched all 3 of these radar videos and learned a lot. Can you keep them coming and get more advanced as we go?

this let me understand why changing prf is important

What should I study if I want to learn more of this?

This is great! I've got your entire back catalogue to enjoy! Not until I've watched this again though, it's brilliantly balanced between the science & presentation, so it's competing yet accessible. Thank you very much!

This is perfect for those of us coming to grips with jet fighters. TY so much.

Good

Tthanks.

I wish everyone online would be as good as you explaining any topic :)

Please add more videos in this playlist sir

But how much use does Doppler give us if it only measures speed in the direction of a radar? Which is almost never is the case, as the targets vector is not pointed directly at us

Ever best Radar knowledge sir

Awesome stuff as always, thanks Mike!

Really great videos.

this helped a lot

That was fantastic !!!