Re: [Discuss-gnuradio] Doppler detection

[Chris Kuethe]

That's why I said "inspirational". Being familiar with what others have done with regard to doppler estimation and correction might help you reuse some parts of their work. 

Another module that might help is gr-inspector - https://github.com/gnuradio/gr-inspector.

Perhaps you can use this to analyze the spectrum to find steady signals that do not change frequency. Then you could apply a series of notch filters to remove those and be left with signals that are somehow more dynamic (changing in frequency or not always present).

On Wed, Aug 23, 2017 at 3:05 AM, Marcus Müller <address@hidden> wrote:

So, adapt the scale with which you look at things.

I think your question could actually use a lot of "describe the problem that you're actually having".

The point is that you don't really seem to understand how you'd "pull the doppler signals" out of a combination of signals. Now, we all love to help each other, but with this, I'm really stuck with "I don't know what Andrew needs help with". My gut feeling is that you haven't got a firm grip on what Doppler estimation really is, or how you can do it:

I guess this would require some sort of processing ?

GNU Radio can help you /implement/ that, but at least the basic principles are universal. I'd have done very much the same as Chris: point you to references, which will allow you to recognize the math behind Doppler estimation from actual implementation.

Best regards,

Marcus

On 08/23/2017 07:42 AM, Andrew Rich wrote:

Sorry you misunderstood my question 

I want the doppler shift of the satellites to be very distinct from the station with no doppler shift 

Much like doppler shift radar perhaps 

But the change in frequency can be minutes long for the satellite pass

Andrew 

On 23 Aug 2017, at 3:26 pm, Chris Kuethe <address@hidden> wrote:

https://github.com/wnagele/gr-gpredict-doppler

https://github.com/daniestevez/doppler

might be helpful or at least inspirational.

On Tue, Aug 22, 2017 at 9:58 PM, Andrew Rich <address@hidden> wrote:

Sorry this is new to me

I have just worked out I can see satellites in a waterfall display due to their doppler shift

I think that lends itself to meteor shower

Can gnu radio be used to assist pulling out the doppler signals from the non doppler ones ?

I guess this would require some sort of processing ?

Andrew

Sent from my iPhone

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