Synthetic-aperture radar
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Search complete. 124 mentions across 13 episodes found for "Synthetic-aperture radar".
Sep 15, 2026
Michelle DemidengoHOST
In today's episode, we are joined by Dr. Pui Anancharasirichai, professor of Visual Computing, and Dr. Alin Achim, professor and chair of Computational Imaging, both from University of Bristol.
Michelle DemidengoHOST
They will discuss the topic of SAR, InSAR, and the future of Earth observation.
Michelle DemidengoHOST
I am pleased to welcome Pui and Alin.
Michelle DemidengoHOST
The platform is all yours.
Alin AchimGUEST
So you have an observation which is noisy or incomplete, and you want to infer what produced it.
Alin AchimGUEST
One of the things I worked on was image restoration and despeckling using statistical modeling and Bayesian approaches.
Alin AchimGUEST
And that's turned out to be a very useful foundation for what I do today because SAR images are also affected by very strong speckle, and many of the problems in SAR are inverse problems.
Alin AchimGUEST
After my PhD, I spent some time as a postdoctoral researcher in Italy and France, and then I joined Bristol in two thousand and four.
Sekhar MudduGUEST
So this is able to get information from about 10 meters scale.
Sekhar MudduGUEST
But the return period of this active microwave satellite-based, we call synthetic aperture radar, which is a SAR satellites, are probably initially it was 20 days.
Veena SrinivasanHOST
Oh.
Sekhar MudduGUEST
Slowly it has become now today you have, uh, um, a Sentinels which are pa- passing every six days.
Joe ReedHOST
And it's interesting to see, you know, we can already see it with like agriculture and how that data would be useful to help like planning.
Joe ReedHOST
And then also, you know, we see with some of the satellite businesses, ISI, for example, with their SAR technology, synthetic aperture radar, and sort of the, you know, defense and other aspects that that can provide.
Joe ReedHOST
for Europe and also just the wider population.
Joe ReedHOST
But then other areas that are less explored or are at the beginning of becoming solidified with data points is like pharmaceuticals we're starting to see some partnerships within that and how that works in a microgravity environment what are the actual benefits of that absolutely yeah and then in addition with sort of the you know where you're making headway is the maritime industry which is very exciting
Nithiyanandam YGUEST
Now, that's how the high-resolution satellites are.
Nithiyanandam YGUEST
The other set of data I'm happy to see in medias, including Indian medias, about utilizing SAR datasets.
Nithiyanandam YGUEST
SAR are synthetic aperture radars where you can see a minor change on the Earth's surfaces, but then it is independent of the weather condition that exists in that area.
Nithiyanandam YGUEST
So you can see through clouds, you can see through thick fog and so on.
Nithiyanandam YGUEST
Because it is an active sensor, the energy is being sent from space.
Nithiyanandam YGUEST
But what is the challenge in using SAR then? It will not show me the same color as I can see in an optical data.
Nithiyanandam YGUEST
It is quite grainy.
Nithiyanandam YGUEST
It is very difficult to interpret.
Prakash PokhrelGUEST
The other is called InSAR.
Prakash PokhrelGUEST
It is called SAR image.
Prakash PokhrelGUEST
In SAR image, we send LIDARs and other radars that penetrate the cloud.
Prakash PokhrelGUEST
And it gives a reflection signal from below.
Prakash PokhrelGUEST
Even if it is cloudy, we can extract information from it.
SueHOST
First up, quick note about a remote sensing mission.
SueHOST
The NASA ISRO Synthetic Aperture Radar, so that's NISAR mission.
SueHOST
So that mission launched last year at the end of the summer.
SueHOST
I think it was end of July.
SueHOST
And over this summer, just past July, they announced that Dataprox products are now available on their S-band.
SueHOST
It's an L-band and S-band synthetic aperture radar.
SueHOST
So just a quick note that it's often used for things like looking at ice and soil and stuff.
SueHOST
And it's not affected by weather.
speaker_0HOST
Yeah.
speaker_0HOST
The source material specifically highlights SAR, which is synthetic aperture radar.
speaker_0HOST
And for you listening, this isn't like logging onto Google Earth and looking at a standard optical photograph of the ocean.
speaker_1HOST
No, not at all.
speaker_1HOST
Mm-hmm.
speaker_0HOST
And they've been capturing the ocean surface using C-band synthetic aperture radar, or SAR, in what's called wave mode.
speaker_0HOST
So we're talking about roughly ten million images of the ocean surface.
speaker_1HOST
That's a massive data set.
speaker_0HOST
And I know we threw around the term domain gap a second ago.
speaker_1HOST
Mm-hmm.
speaker_0HOST
But how fundamental is the difference really between a photograph of a dog and a SAR image of the ocean?
speaker_1HOST
I mean, it is entirely different physics.
speaker_0NARRATOR
That makes gradual ground movement difficult to detect, particularly when early changes are too small to produce obvious surface damage.
speaker_0NARRATOR
Researchers at Seoul National University of Science and Technology, Seoul Tech, have tested a monitoring framework that combines satellite-based interferometric synthetic aperture radar, InSAR, terrestrial laser scanning, and ground-penetrating radar, GPR.
speaker_0NARRATOR
The aim is to give infrastructure operators a way to screen large areas first, then concentrate more detailed investigation on locations showing unusual movement.
speaker_0NARRATOR
Led by civil engineering master's student Taeyong Park, the research team applied the method to more than 16 kilometers of Seoul's Bundang Line between Sucio Station and Cheongnyangni Station.
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