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Topic: Small Weather Doppler Radar using Arduino/AVR (Read 487 times) previous topic - next topic

HugoPilot

Hi there!

I am thinking of a building a little Doppler radar that can show me precipitation intensity in the clouds.

The range doesn't have to be far (5-10km should be enough). But I want to have high resolution out of it.

Is this project possible with multiple Arduino's? What kind of radio/microwave frequencies should I use to make clouds/water reflect those waves back to my receiver? And are there useful links for building a radar like this?

Thanks in advance!

Grumpy_Mike

#1
Sep 02, 2018, 03:19 pm Last Edit: Sep 02, 2018, 03:20 pm by Grumpy_Mike
Quote
What kind of radio/microwave frequencies should I use to make clouds/water reflect those waves back to my receiver?
https://www.everythingweather.com/weather-radar/bands.shtml

But I doubt an Arduino can do much for you.

AWOL

From Mike's link
Quote
where as a private TV station such as KCCI-TV in Des Moines only broadcasts at 270,000 watts
"only"  :o

jremington

"Only" when compared to
Quote
The NWS transmits at 750,000 watts of power for their S band [weather radar]

PaulRB

Surely that can't be average power? It must be instantaneous power for very short pulses. Possibly "chirped" to compensate for atmospheric dispersion.

Paul_KD7HB

#5
Sep 02, 2018, 10:58 pm Last Edit: Sep 02, 2018, 11:02 pm by Paul_KD7HB
Surely that can't be average power? It must be instantaneous power for very short pulses. Possibly "chirped" to compensate for atmospheric dispersion.
That's ERP. Effective radiated power. Actual output power X antenna gain.

Paul

PS: you would also need to be able to detect changes in the frequency of the returned echos. Due to the movement of the rain drops. Doppler radar doesn't detect clouds because they are not moving fast enough.

PaulRB

That's ERP. Effective radiated power. Actual output power X antenna gain.
So, yes, instantaneous power X antenna gain. The average input power to the transmitter system will be a tiny fraction of that effective radiated power.

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