Greetings all, Let's say if I want to do it for Doppler frequency of 200KHz and Doppler rate 10KHz/s is it possible to do with USRP hardware simulations.
On Tue, Jan 2, 2024 at 7:17 AM <discuss-gnuradio-requ...@gnu.org> wrote: > Send Discuss-gnuradio mailing list submissions to > discuss-gnuradio@gnu.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > or, via email, send a message with subject or body 'help' to > discuss-gnuradio-requ...@gnu.org > > You can reach the person managing the list at > discuss-gnuradio-ow...@gnu.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Discuss-gnuradio digest..." > > > Today's Topics: > > 1. Re: Doppler (Marcus D. Leech) > 2. Re: Doppler (Jeff Long) > 3. Re: Doppler (Marcus D. Leech) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 1 Jan 2024 20:31:57 -0500 > From: "Marcus D. Leech" <patchvonbr...@gmail.com> > To: discuss-gnuradio@gnu.org > Subject: Re: Doppler > Message-ID: <e81603a8-6e4b-4f63-8fc5-b1f007f92...@gmail.com> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > On 01/01/2024 20:28, Jeff Long wrote: > > The problem here is relating this kind of chirp to anything physical. > > As Daniel says, this may make sense for a synthesized signal. It's > > pretty easy to create any signal you want using some combination of > > Python and GNU Radio (or other tools). One possible problem could be > > specifying very large numbers for parameters in some programs. > The term "doppler" tends to imply in many engineer's minds some type of > actual physicality... > > > > > > On Mon, Jan 1, 2024 at 7:40 PM Marcus D. Leech > > <patchvonbr...@gmail.com> wrote: > > > > On 01/01/2024 16:11, Marcus Müller wrote: > >> > >> Liya, > >> > >> Doppler shift Δf is proportional to both speed and carrier > >> frequency /f/₀ > >> > >> Δ/f/ = /f/₀ · /v///c/₀, > >> > >> where /v/ is the relative speed of your thing, and /c/₀ is the > >> speed of light. > >> > >> The highest frequencies we can, so far, do radio communications > >> on, are in the range of f₀=150 GHz. > >> > >> So, assuming you do communications on 150 GHz, for your Doppler > >> shift to be Δ/f=/10 GHz higher after 1s, your acceleration must been > >> > >> /a = /Δ/f / f/₀ · /c/₀ / 1s = 10 GHz / 150 GHz · 3·10⁸ m/s / s = > >> 2/30 · 3·10⁸ m/s² = 1/15 /c/₀/s. > >> > >> The fastest object mankind has ever built is the Parker Solar > >> Probe, which will burn up while it spirals into the sun, at a > >> maximum velocity of ca 1/15 of the speed of light. It takes it > >> years to reach that speed, not 1s. > >> > >> So, you're assuming you're seeing a doppler from a satellite > >> rotating around earth that sees a relative acceleration higher > >> than a "satellite" around the sun actively being pulled into the > >> sun by the sun's immense gravity. > >> > >> That sadly makes no physical sense! > >> > >> Best regards, > >> Marcus > >> > > C/15 is actually about *twice* as fast as the fastest object we > > will ever have made. > > > > > >> On 01.01.24 07:51, Jiya Johnson wrote: > >>> Yes I want to use 10GHz/s > >>> > >>> On Sat, Dec 30, 2023, 4:05 PM Jiya Johnson > >>> <jiyajohnso...@gmail.com> wrote: > >>> > >>> Greetings everyone, > >>> https://github.com/daniestevez/reu-2023/tree/main/doppler > >>> I went through these grc files and tried to do > >>> drift_simulation, i am not getting the way to get 10GHz/s > >>> using inspectrum and frequency sink slope calculation i have > >>> attached the grc and screenshots. > >>> image.png > >>> image.png > >>> > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/934e8c35/attachment.htm > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image.png > Type: image/png > Size: 194533 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/934e8c35/attachment.png > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image.png > Type: image/png > Size: 111344 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/934e8c35/attachment-0001.png > > > > ------------------------------ > > Message: 2 > Date: Mon, 1 Jan 2024 20:40:45 -0500 > From: Jeff Long <willco...@gmail.com> > To: discuss-gnuradio@gnu.org > Subject: Re: Doppler > Message-ID: > < > cac5f9jaheur6pdmcfaehqdagnjh9okil+dludwneorf2ssy...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Doppler also applies to lasers. > > On Mon, Jan 1, 2024 at 8:32 PM Marcus D. Leech <patchvonbr...@gmail.com> > wrote: > > > On 01/01/2024 20:28, Jeff Long wrote: > > > > The problem here is relating this kind of chirp to anything physical. > > As Daniel says, this may make sense for a synthesized signal. It's pretty > > easy to create any signal you want using some combination of Python and > GNU > > Radio (or other tools). One possible problem could be specifying very > large > > numbers for parameters in some programs. > > > > The term "doppler" tends to imply in many engineer's minds some type of > > actual physicality... > > > > > > > > On Mon, Jan 1, 2024 at 7:40 PM Marcus D. Leech <patchvonbr...@gmail.com> > > wrote: > > > >> On 01/01/2024 16:11, Marcus Müller wrote: > >> > >> Liya, > >> > >> Doppler shift Δf is proportional to both speed and carrier frequency > *f*₀ > >> > >> Δ*f* = *f*₀ · *v*/*c*₀, > >> > >> where *v* is the relative speed of your thing, and *c*₀ is the speed of > >> light. > >> > >> The highest frequencies we can, so far, do radio communications on, are > >> in the range of f₀=150 GHz. > >> > >> So, assuming you do communications on 150 GHz, for your Doppler shift to > >> be Δ*f=*10 GHz higher after 1s, your acceleration must been > >> > >> *a = *Δ*f / f*₀ · *c*₀ / 1s = 10 GHz / 150 GHz · 3·10⁸ m/s / s = 2/30 · > >> 3·10⁸ m/s² = 1/15 *c*₀/s. > >> > >> The fastest object mankind has ever built is the Parker Solar Probe, > >> which will burn up while it spirals into the sun, at a maximum velocity > of > >> ca 1/15 of the speed of light. It takes it years to reach that speed, > not > >> 1s. > >> > >> So, you're assuming you're seeing a doppler from a satellite rotating > >> around earth that sees a relative acceleration higher than a "satellite" > >> around the sun actively being pulled into the sun by the sun's immense > >> gravity. > >> > >> That sadly makes no physical sense! > >> > >> Best regards, > >> Marcus > >> > >> C/15 is actually about *twice* as fast as the fastest object we will > ever > >> have made. > >> > >> > >> On 01.01.24 07:51, Jiya Johnson wrote: > >> > >> Yes I want to use 10GHz/s > >> > >> On Sat, Dec 30, 2023, 4:05 PM Jiya Johnson <jiyajohnso...@gmail.com> > >> wrote: > >> > >>> Greetings everyone, > >>> https://github.com/daniestevez/reu-2023/tree/main/doppler > >>> I went through these grc files and tried to do drift_simulation, i am > >>> not getting the way to get 10GHz/s using inspectrum and frequency sink > >>> slope calculation i have attached the grc and screenshots. > >>> [image: image.png] > >>> [image: image.png] > >>> > >>> > >> > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/bc2fb883/attachment.htm > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image.png > Type: image/png > Size: 194533 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/bc2fb883/attachment.png > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image.png > Type: image/png > Size: 111344 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/bc2fb883/attachment-0001.png > > > > ------------------------------ > > Message: 3 > Date: Mon, 1 Jan 2024 20:46:47 -0500 > From: "Marcus D. Leech" <patchvonbr...@gmail.com> > To: discuss-gnuradio@gnu.org > Subject: Re: Doppler > Message-ID: <92e54bd6-9165-48d0-ad43-861ad4d35...@gmail.com> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > On 01/01/2024 20:40, Jeff Long wrote: > > Doppler also applies to lasers. > Well, OK. Maybe we're not talking radio at all here. Wouldn't be the > first time Gnu Radio has been used for > other parts of the EM (and even non-EM) spectrum. > > I'm not really up to date on the state of optics and optical/RF > interfaces, so, maybe I'll learn something... > > > > > > On Mon, Jan 1, 2024 at 8:32 PM Marcus D. Leech > > <patchvonbr...@gmail.com> wrote: > > > > On 01/01/2024 20:28, Jeff Long wrote: > >> The problem here is relating this kind of chirp to anything > >> physical. As Daniel says, this may make sense for a synthesized > >> signal. It's pretty easy to create any signal you want using some > >> combination of Python and GNU Radio (or other tools). One > >> possible problem could be specifying very large numbers for > >> parameters in some programs. > > The term "doppler" tends to imply in many engineer's minds some > > type of actual physicality... > > > > > >> > >> On Mon, Jan 1, 2024 at 7:40 PM Marcus D. Leech > >> <patchvonbr...@gmail.com> wrote: > >> > >> On 01/01/2024 16:11, Marcus Müller wrote: > >>> > >>> Liya, > >>> > >>> Doppler shift Δf is proportional to both speed and carrier > >>> frequency /f/₀ > >>> > >>> Δ/f/ = /f/₀ · /v///c/₀, > >>> > >>> where /v/ is the relative speed of your thing, and /c/₀ is > >>> the speed of light. > >>> > >>> The highest frequencies we can, so far, do radio > >>> communications on, are in the range of f₀=150 GHz. > >>> > >>> So, assuming you do communications on 150 GHz, for your > >>> Doppler shift to be Δ/f=/10 GHz higher after 1s, your > >>> acceleration must been > >>> > >>> /a = /Δ/f / f/₀ · /c/₀ / 1s = 10 GHz / 150 GHz · 3·10⁸ m/s / > >>> s = 2/30 · 3·10⁸ m/s² = 1/15 /c/₀/s. > >>> > >>> The fastest object mankind has ever built is the Parker > >>> Solar Probe, which will burn up while it spirals into the > >>> sun, at a maximum velocity of ca 1/15 of the speed of light. > >>> It takes it years to reach that speed, not 1s. > >>> > >>> So, you're assuming you're seeing a doppler from a satellite > >>> rotating around earth that sees a relative acceleration > >>> higher than a "satellite" around the sun actively being > >>> pulled into the sun by the sun's immense gravity. > >>> > >>> That sadly makes no physical sense! > >>> > >>> Best regards, > >>> Marcus > >>> > >> C/15 is actually about *twice* as fast as the fastest object > >> we will ever have made. > >> > >> > >>> On 01.01.24 07:51, Jiya Johnson wrote: > >>>> Yes I want to use 10GHz/s > >>>> > >>>> On Sat, Dec 30, 2023, 4:05 PM Jiya Johnson > >>>> <jiyajohnso...@gmail.com> wrote: > >>>> > >>>> Greetings everyone, > >>>> https://github.com/daniestevez/reu-2023/tree/main/doppler > >>>> I went through these grc files and tried to do > >>>> drift_simulation, i am not getting the way to get > >>>> 10GHz/s using inspectrum and frequency sink slope > >>>> calculation i have attached the grc and screenshots. > >>>> image.png > >>>> image.png > >>>> > >> > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/015d48c4/attachment.htm > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image.png > Type: image/png > Size: 194533 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/015d48c4/attachment.png > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image.png > Type: image/png > Size: 111344 bytes > Desc: not available > URL: < > https://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20240101/015d48c4/attachment-0001.png > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > ------------------------------ > > End of Discuss-gnuradio Digest, Vol 255, Issue 3 > ************************************************ >
