Sorry for the delayed response.
I do have info on the object I am tracking and can calculate the radar
cross section. It is a model rocket that can most likely be estimated as a
cylinder with small error between the two calculations.
The system as a whole will technically be active since we will
Hi Alex,
please keep this discussion on the mailing list. Thus, I included the
mailing list in this reply again.
Let's summarize your system
carrier frequency 5.8GHz
Radar ranging with reflection loss. Do you have any info on your
reflecting object? An objects radar cross-section may heavily
Hi Alex,
your cut-off frequency needs to be lower than half your sampling rate.
If your sampling rate is 61.44MHz, your maximum cut-off frequency can be
30.72MHz. And it should probably be a bit lower. You're working in
baseband here. It is really important to understand the concepts of
digita
Right, because the filter cutoff frequency needs to be at least half the
sampling rate, I figured I would not be able to use a filter since the
bladeRF I will be using has a 61.44 MHz sampling rate and I will be
operating in the GHz range.
What I will probably end up having to do is do a pre-run c
Hi Alex,
"0 < fa <= sampling_rate/2" is correct and should always be enforced. If
you try to set your filter cut-off frequency at >= samp_rate/2, you'll
experience aliasing.
After reading your mails, I get the impression you try to set your
filter cut-off frequency at your carrier frequency
The effective noise bandwidth is part of the calculation. I'm using the
radar range equation.
My purpose for including the bandwidth in my response was that any time I
try to use a filter with a frequency greater than my sampling rate/2 I get
an error returned. I agree that ideally I would use a b
Hi Alex,
On 25/06/2020 21.00, Alex Batts wrote:
I'm sampling an incoming signal, but only around 2 MSps.
and that's fine! that's the *equivalent* baseband, it has all the same
information as the RF signal.
I need the signal power to noise power ratio at the receiver as part of
my range ca
I'm sampling an incoming signal, but only around 2 MSps.
I need the signal power to noise power ratio at the receiver as part of my
range calculation. So I would need to be able to distinguish between the
power of the tone vs the power of the surrounding noise and use those two
numerical values in
But you're sampling something, or else you couldn't process this in GNU
Radio. So, I'm a bit confused about what you're actually doing.
On 25/06/2020 20.48, Alex Batts wrote:
Sorry, I'm new to the mailing list as well.
How would you recommend isolating the tone power? A band pass filter
woul
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,
A
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 s
Hi Alex,
one's signal is another person's noise... You need to define of what
nature your signal is, and then you can (often) quite easily build an
SNR estimator for that specific signal :)
Best regards,
Marcus
On 24/06/2020 14.58, Alex Batts wrote:
Hello,
I am relatively new to GNU Radio
Hello,
I am relatively new to GNU Radio and I am trying to calculate the SNR of an
incoming signal. On the QT Gui frequency display it shows a red line and a
green line which I take to be the average noise power and average signal
power of the incoming signal (from my RTL SDR) respectively. Is the
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