it worked perfectly.. Thank you so much...
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Today's Topics:
1. Clipping and Renaming wavesink output file (Sreejith RK Nair)
2. Re: Discuss-gnuradio Digest, Vol 255, Issue 3 (Jiya Johnson)
3. Re: Clipping and Renaming wavesink output file (Jeff Long)
4. Re: Doppler (Daniel Estévez)
5. Re: Doppler (Daniel Estévez)
6. "Windows Size" or "Canvas Size" in Options Block of GNU Radio
3.10.1.1 (ELIZEU FERREIRA XAVIER)
7. Re: Doppler (Marcus D. Leech)
----------------------------------------------------------------------
Message: 1
Date: Tue, 2 Jan 2024 08:46:37 +0530
From: Sreejith RK Nair <sreejithrknair143@gmail.com>
To: discuss-gnuradio@gnu.org
Subject: Clipping and Renaming wavesink output file
Message-ID:
<CAKfesxdCQW5Ofy32S+qFQtFd4poT3kNfU2jqDOV8Y4HqdQBG2w@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi,
I have created a FM receiver using GNU and the output is fed to an audio
sink to listen live and to a wavefile sink to record. There was no option
to edit the recording time in GUI, so I edited the python code to record
and rename the file every 5 mins. But the problem is only the first file
has data and other files are created but with no data.The code i've written
for this as follows:
*def create_new_file(self):*
*current_time = datetime.datetime.now() elapsed_time = current_time
- self.start_time if elapsed_time.total_seconds() >= REC_TIME_SEC:
self.blocks_wavfile_sink_0.close() filename =
'E:\\Record\\{}.mp3'.format(current_time.strftime("%Y%m%d_%H%M%S"))
self.blocks_wavfile_sink_0 = blocks.wavfile_sink(filename, 1, 48000,
8) self.start_time = current_time def
check_and_create_file(self): current_time = datetime.datetime.now()
elapsed_time = current_time - self.start_time if
elapsed_time.total_seconds() >= REC_TIME_SEC:
self.create_new_file() def work(self, input_items,
output_items): current_time = datetime.datetime.now()
elapsed_time = current_time - self.start_time
self.total_items_written+=len(output_items[0]) # Call
create_new_file multiple times if enough time has elapsed if
elapsed_time.total_seconds() >= REC_TIME_SEC:
self.create_new_file() current_time = datetime.datetime.now()
elapsed_time = current_time - self.start_time return
len(output_items[0])*
Thank you in advance..
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------------------------------
Message: 2
Date: Tue, 2 Jan 2024 09:59:14 +0530
From: Jiya Johnson <jiyajohnson10@gmail.com>
To: GNURadio Mailing List <discuss-gnuradio@gnu.org>
Subject: Re: Discuss-gnuradio Digest, Vol 255, Issue 3
Message-ID:
<CANaw2UttDj8bp6+QB=W=y0eChmMcy01em1RkjVtpLDM3T11wCA@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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-request@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-request@gnu.org
>
> You can reach the person managing the list at
> discuss-gnuradio-owner@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" <patchvonbraun@gmail.com>
> To: discuss-gnuradio@gnu.org
> Subject: Re: Doppler
> Message-ID: <e81603a8-6e4b-4f63-8fc5-b1f007f92e66@gmail.com" target="_blank">e81603a8-6e4b-4f63-8fc5-b1f007f92e66@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
> > <patchvonbraun@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
> >>> <jiyajohnson10@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
> >>>
> >
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>
> ------------------------------
>
> Message: 2
> Date: Mon, 1 Jan 2024 20:40:45 -0500
> From: Jeff Long <willcode4@gmail.com>
> To: discuss-gnuradio@gnu.org
> Subject: Re: Doppler
> Message-ID:
> <
> CAC5f9jaHEUR6PdmCFAEHQdaGnjh9oKiL+dLudWNEORf2sSyyUA@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 <patchvonbraun@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 <patchvonbraun@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 <jiyajohnson10@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]
> >>>
> >>>
> >>
> >
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>
> ------------------------------
>
> Message: 3
> Date: Mon, 1 Jan 2024 20:46:47 -0500
> From: "Marcus D. Leech" <patchvonbraun@gmail.com>
> To: discuss-gnuradio@gnu.org
> Subject: Re: Doppler
> Message-ID: <92e54bd6-9165-48d0-ad43-861ad4d3553e@gmail.com" target="_blank">92e54bd6-9165-48d0-ad43-861ad4d3553e@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
> > <patchvonbraun@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
> >> <patchvonbraun@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
> >>>> <jiyajohnson10@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
> >>>>
> >>
> >
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>
> ------------------------------
>
> 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
> ************************************************
>
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Message: 3
Date: Tue, 2 Jan 2024 04:50:41 -0500
From: Jeff Long <willcode4@gmail.com>
To: GNURadio Discussion List <discuss-gnuradio@gnu.org>
Subject: Re: Clipping and Renaming wavesink output file
Message-ID:
<CAC5f9jYZO9qvOgBmNpRnJKBByAbvWzo3=yOr3xsCDqcb6XKCQQ@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
You wouldn't replace the file sink. Just call
wavefile_sink.open(new_file_name)
which will also automatically close the old file for you.
Instead of using a work function to count items, add a separate timer
thread to the python code that calls open() every 5 mins. Much simpler.
On Mon, Jan 1, 2024 at 11:44 PM Sreejith RK Nair <
sreejithrknair143@gmail.com> wrote:
> Hi,
> I have created a FM receiver using GNU and the output is fed to an audio
> sink to listen live and to a wavefile sink to record. There was no option
> to edit the recording time in GUI, so I edited the python code to record
> and rename the file every 5 mins. But the problem is only the first file
> has data and other files are created but with no data.The code i've written
> for this as follows:
> *def create_new_file(self):*
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> *current_time = datetime.datetime.now() elapsed_time = current_time
> - self.start_time if elapsed_time.total_seconds() >= REC_TIME_SEC:
> self.blocks_wavfile_sink_0.close() filename =
> 'E:\\Record\\{}.mp3'.format(current_time.strftime("%Y%m%d_%H%M%S"))
> self.blocks_wavfile_sink_0 = blocks.wavfile_sink(filename, 1, 48000,
> 8) self.start_time = current_time def
> check_and_create_file(self): current_time = datetime.datetime.now()
> elapsed_time = current_time - self.start_time if
> elapsed_time.total_seconds() >= REC_TIME_SEC:
> self.create_new_file() def work(self, input_items,
> output_items): current_time = datetime.datetime.now()
> elapsed_time = current_time - self.start_time
> self.total_items_written+=len(output_items[0]) # Call
> create_new_file multiple times if enough time has elapsed if
> elapsed_time.total_seconds() >= REC_TIME_SEC:
> self.create_new_file() current_time = datetime.datetime.now()
> elapsed_time = current_time - self.start_time return
> len(output_items[0])*
> Thank you in advance..
>
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------------------------------
Message: 4
Date: Tue, 2 Jan 2024 10:53:51 +0100
From: Daniel Estévez <daniel@destevez.net>
To: discuss-gnuradio@gnu.org
Subject: Re: Doppler
Message-ID: <f4b01c3f-7496-47f5-a29a-f3c22686a693@destevez.net" target="_blank">f4b01c3f-7496-47f5-a29a-f3c22686a693@destevez.net>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
On 01/01/2024 07:51, Jiya Johnson wrote:
> Yes I want to use 10GHz/s
Hi all,
Besides the physical considerations that Marcus and Marcus have
mentioned, I *think* it should be possible to adapt the flowgraph you
attached in your first message to generate correctly a chirp waveform at
10GHz/s as you could have in some radars. (Here the "*think*" comes
because most of these blocks use float parameters rather than double,
which for some specific applications can be insufficient. Here I think
this won't be a problem, but I'm not sure until I see it working).
The thing you need to do is to calculate some numbers and use a sensible
sample rate for what you want (there is no reasonable way you're going
to get a 10 GHz/s sweep in a 1 ksps sample rate, which is what you have
in your flowgraph). For instance, say that your chirp waveform sweeps a
bandwidth of 100 MHz. At 10 GHz/s, it takes 10 ms to sweep 100 MHz. This
gives the period of your sawtooth. Let's say you use a sample rate of
200 Msps, which is good to represent a 100 MHz bandwidth signal with IQ
sampling.
Then you need to set the frequency of the sawtooth to 100 Hz ( = 1 / 10
ms). If you want the sawtooth output to have units of Hz, its amplitude
should be 100e6 (to achieve a 100 MHz sweep).
The formulas in the flowgraph you have all work correctly to this
purpose, but to use them, you nee to set the drift_rate to 10e9 (10
GHz/s), the drift_duration to 10e-3 (10 ms, see above), and the sample
rate needs to be at least somewhat higher than 100e6 (say 200e6).
Best,
Daniel.
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------------------------------
Message: 5
Date: Tue, 2 Jan 2024 11:01:45 +0100
From: Daniel Estévez <daniel@destevez.net>
To: discuss-gnuradio@gnu.org
Subject: Re: Doppler
Message-ID: <1b1b9ae6-b280-4e10-92d8-56ea6ca9c3d9@destevez.net" target="_blank">1b1b9ae6-b280-4e10-92d8-56ea6ca9c3d9@destevez.net>
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By the way,
Just for fun, there is this paper about what Doppler drift rates are
physically meaningful in RF. This topic comes up when doing de-drift in
narrowband SETI searches:
https://arxiv.org/pdf/1910.01148.pdf
Some of the objects at the bottom of Table 2 do indeed exceed 10 GHz/s
even for S-band carrier frequencies. But these are crazy situations,
such as a transmitter orbiting a neutron star very close to its surface.
Best,
Daniel.
On 01/01/2024 22:11, 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
>
> 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 <jiyajohnson10@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
>>
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Message: 6
Date: Tue, 2 Jan 2024 11:48:21 -0300
From: ELIZEU FERREIRA XAVIER <efxavier@ime.eb.br>
To: discuss-gnuradio@gnu.org
Subject: "Windows Size" or "Canvas Size" in Options Block of GNU Radio
3.10.1.1
Message-ID:
<CAL5=sNM7fvnQdqo4=bKdggCcvVq-Bp8_wP-h=je1277EgDEN0A@mail.gmail.com>
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Hi People!
What happened with the "Windows Size" in Properties of "Options Block" ?
It's not there anymore.
I was told by a folk in a Gnu Radio chat:
"I don't think the option was used since GR 3.8 when the canvas became
dynamic and can be scrolled in and out with the mouse wheel."
... But documentation and the Wiki Page of Options block still mention this
function.
Is this correct or is it a bug?
Thanks in advance.
Elizeu F. Xavier
Servidor Civil
LCD - Laboratório de Comunicações Digitais
Instituto Militar de Engenharia - IME
Seção de Ensino de Engenharia Elétrica - SE/3
Praça General Tibúrcio, 80 - Praia Vermelha (Urca)
Rio de Janeiro - RJ - CEP 22290-270 - Tel.: (21)3820-4145
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Message: 7
Date: Tue, 2 Jan 2024 11:25:22 -0500
From: "Marcus D. Leech" <patchvonbraun@gmail.com>
To: discuss-gnuradio@gnu.org
Subject: Re: Doppler
Message-ID: <db326f48-6ee6-4fac-a0f6-8bb0bf48581e@gmail.com" target="_blank">db326f48-6ee6-4fac-a0f6-8bb0bf48581e@gmail.com>
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On 02/01/2024 05:01, Daniel Estévez wrote:
> By the way,
>
> Just for fun, there is this paper about what Doppler drift rates are
> physically meaningful in RF. This topic comes up when doing de-drift
> in narrowband SETI searches:
>
> https://arxiv.org/pdf/1910.01148.pdf
>
> Some of the objects at the bottom of Table 2 do indeed exceed 10 GHz/s
> even for S-band carrier frequencies. But these are crazy situations,
> such as a transmitter orbiting a neutron star very close to its surface.
Orbiting a transmitter around a neutron star, as one does for
entertainment. Or perhaps as a final-year project when attending
Galactic University....
>
> Best,
> Daniel.
>
> On 01/01/2024 22:11, 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
>>
>> 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 <jiyajohnson10@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
>>>
>
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