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Lithuanian startup launches open-source network to detect Shahed-type drones

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Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#21

Post by shevy-java »

dmos62 wrote: post #15

[flagged]

That statement made ignores several facts.

For instance:

a) Lithuania is not at war right now. Ukraine is. So the comparison already does not work.

b) There are drones entering the airspace of Lithuania somewhat regularly; two weeks ago was the last one: https://tvpworld.com/93695919/nato-rafale-jet-shoots-down-dr...

So, knowing this, but also for more reasons, it absolutely makes sense for Lithuania to not neglect its capabilities, and that includes start-ups that want to be supportive here.

> If we're serious about defence, cooperation with Ukies and expansion of the EU defence sector is the way.

So at which point has the war been about other countries? Lithuania is not at war and it makes no sense to assume that every other country but Ukraine is clueless.

> Phones against windows will not deter ww3.

Aha. So pray tell and explain what your plan is against nukes.

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#22

Post by Hnrobert42 »

MiracleRabbit wrote: post #14

If these Shahed drones have a propeller they should have a brutal signature between 0-250Hz as they are moving a lot of air. And if the engine speed of the Shahed stays constant it will be even easier to detect it ("Angry lawnmower sound".. but that's only the high frequency part of it). There are extremely sensitive differential pressure sensors (like SDP600-25Pa) available from Sensirion that aren't overly expensiv…

Interesting! There are a lot of super loud cars in my urban area. I want to catalog where and when they drive, so I can stand on the side of the street and shake my cane at them.

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#24

Post by snovv_crash »

nefarious_ends wrote: post #20
Avicebron wrote: post #13

Earlier quoted context omitted.

As much as I like to point and guffaw at "bad evil rocket man" the from orbit bit is doing a massive amount of lift (pun not intended) for that price.

[flagged]

[flagged]

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#25

Post by [deleted] »

tristanj wrote: post #6

Shahed drones have increased in altitude from ~500m at the beginning of the Ukraine war to 2000-3000m, which is a 4x reduction in noise on the ground. The higher the drones are, the less noise they make at ground level, and the less effective this ground-based microphone system will be. The drones have moved to elevations to make them more difficult to target with ground based weapons. Reductions in ground noise are…

[deleted]

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#26

Post by ejanus »

MiracleRabbit wrote: post #14

If these Shahed drones have a propeller they should have a brutal signature between 0-250Hz as they are moving a lot of air. And if the engine speed of the Shahed stays constant it will be even easier to detect it ("Angry lawnmower sound".. but that's only the high frequency part of it). There are extremely sensitive differential pressure sensors (like SDP600-25Pa) available from Sensirion that aren't overly expensiv…

Interesting! I will like to see your circuits, if any.

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#27

Post by customguy »

MiracleRabbit wrote: post #14

If these Shahed drones have a propeller they should have a brutal signature between 0-250Hz as they are moving a lot of air. And if the engine speed of the Shahed stays constant it will be even easier to detect it ("Angry lawnmower sound".. but that's only the high frequency part of it). There are extremely sensitive differential pressure sensors (like SDP600-25Pa) available from Sensirion that aren't overly expensiv…

> Use one differential side and connect it to a kitchen funnel for directional listening the other one to a plastic bottle with a very very small hole in it. It will pick up everything high frequency that's different to the environmental pressure.

Nevermind drones, and war, that's all fine; but I need to know more about this. Is there a phrase or name for this I could use to find more information, maybe example schematics?

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#28

Post by Neywiny »

warumdarum wrote: post #12
tristanj wrote: post #6

Shahed drones have increased in altitude from ~500m at the beginning of the Ukraine war to 2000-3000m, which is a 4x reduction in noise on the ground. The higher the drones are, the less noise they make at ground level, and the less effective this ground-based microphone system will be. The drones have moved to elevations to make them more difficult to target with ground based weapons. Reductions in ground noise are…

So film the sky during charging and run a llm on it?

Or an image detection model. Fraction of the compute and can run even on edge embedded. And easy to train with your own data

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#29

Post by MiracleRabbit »

ejanus wrote: post #26
MiracleRabbit wrote: post #14

If these Shahed drones have a propeller they should have a brutal signature between 0-250Hz as they are moving a lot of air. And if the engine speed of the Shahed stays constant it will be even easier to detect it ("Angry lawnmower sound".. but that's only the high frequency part of it). There are extremely sensitive differential pressure sensors (like SDP600-25Pa) available from Sensirion that aren't overly expensiv…

Interesting! I will like to see your circuits, if any.

Not much circuits needed.

The SDP600-25Pa speaks I2C and only has a handful of commands.

Just read it out with a microcontroller you love (like ESP32) and send the samples to a host for analysis. The ESP32 has limited I2C time stretching capabilities limiting it in the highest resolution modes of the sensor - but often that's not a big factor.

To not overwhelm the poor processor and Wifi maybe better a bunch of frames (like 512 or more).

Re: Lithuanian startup launches open-source network to detect Shahed-type drones

#30

Post by MiracleRabbit »

customguy wrote: post #27
MiracleRabbit wrote: post #14

If these Shahed drones have a propeller they should have a brutal signature between 0-250Hz as they are moving a lot of air. And if the engine speed of the Shahed stays constant it will be even easier to detect it ("Angry lawnmower sound".. but that's only the high frequency part of it). There are extremely sensitive differential pressure sensors (like SDP600-25Pa) available from Sensirion that aren't overly expensiv…

> Use one differential side and connect it to a kitchen funnel for directional listening the other one to a plastic bottle with a very very small hole in it. It will pick up everything high frequency that's different to the environmental pressure. Nevermind drones, and war, that's all fine; but I need to know more about this. Is there a phrase or name for this I could use to find more information, maybe example schem…

The Sensirion SDP600-25Pa speaks I2C and only has a handful of primitive commands. Add this and 3.3V and you are done.

I'm 99.5% sure if you throw Claude with a datasheet on it will Slop out working code for a ESP32 with ESP-IDF.

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