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Ueli Giger (@ueligiger)


Re: Error in frequency estimation for low frequencies

Reply posted 2 months ago (05/21/2024)
Hello CedronI've now tested different approachs including digital mixing, autocorrelation and simple time domain phase measurements but at the end I see the same...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/22/2024)
Hello SlartibartfastAs mentioned above, I believe we have some issues to resolve in our measurement system before we can work on the accuracy itself.We are using...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/22/2024)
Hello CedronI appreciate your enthusiasm to support newbies like me and also what you have implemented in your blog articles.We now have a lot of input and need...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/20/2024)
We usually work with a DFT but started some research with the CZT where we saw then the problem of the initial post.I will further check your idea and search for...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/20/2024)
Thanks for your feedback. Interesting to hear that you worked in the 90's with FMCW radar's and saw the same problems. 

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/20/2024)
Hello CedronThanks for sharing your ideas and for your great feedback. I will study it in more detail and try to implement it in the end application.

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/19/2024)
Hello DanThanks for sharing the two documents. I was not aware of the TI paper what clears up a lot between the differences of both architectures.

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/19/2024)
Hello CedronYou're right it makes sense that I share some real world data. We sample the time domain signal after the real baseband mixer. We are using a highpass...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/19/2024)
Hello bloublouWe are using a windowing in the end application but see the same effect there for low frequencies.As mentioned above our end application is an FMCW...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/19/2024)
Hello DanInteresting input, thank you very much. We will study it in more detail in combination with the feedback of Cedron.

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/19/2024)
Hello CedronThanks for linking your blog posts in this and also the other reply. They are great but I need more time to dig deeper here.Maybe you're exact formulas...

Re: Error in frequency estimation for low frequencies

Reply posted 3 months ago (04/19/2024)
Thanks for your reply and yes you are right we are working with real-valued sinusoids.The end application is an FMCW radar where we have no option to use a complex...
Hello everyoneWe want to use a chirp z-transform to determine the frequency of a signal more accurately. It works quite well, but we see that the accuracy is much...

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