Re: Calculating SNR of an incoming signal

[Alex Batts]

Sorry, I'm new to the mailing list as well.

How would you recommend isolating the tone power? A band pass filter wouldn't work at that frequency since there isn't an SDR that can sample that high. Would that be where the Phase Locked Loop comes into play?

Thank you for your help to this point,

Alex

On Thu, Jun 25, 2020 at 1:41 PM Marcus Müller <mueller@kit.edu> wrote:

Hi Alex,

can you make sure to reply to the mailing list, not just me alone?
Others usually take interest in discussion, too :)

Well, then it's easy.

Total signal power is simply the average magnitude square of your
received signal
You just need to subtract the power of the tone (that's its squared
amplitude) and get the noise power.

Divide these two, and you get SNR.

However, since this is the description of a Radar that assumes its
targets are stationary, you'd probably use a PLL to remove the noise
bandwidth drastically, so not quite sure that kind of SNR measurement is
extremely useful for realistic system comparison!

Best regards,
Marcus
On 24/06/2020 16.58, Alex Batts wrote:
> Hello,
>
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> The incoming signal is going to be a specific tone, probably around 5.8
> GHz. I am going to be using it for radar range detection. My SDR will
> just passively receive the reflected signal off of the object and use
> the SNR in the range calculation.
>
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>
> Thank you,
>
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>
> Alex
>
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>