Hello!
1) I've looked into the tx_bursts.cpp code and noticed there isn't any
"wave-type " option, means I assume we have to generate our own signal out/in
this code. Does it mean that if I were to generate the chirp, I have to use
part of the code in tx_waveforms.cpp and type in the chirp's code into
wavetable.hpp so that I am able to send it to the USRP B210 board.
2) If the chirp I would like to generate is 25 MHz with a BW of 20 MHz,
with a transmission pulse width = 2us. Therefore, chirp rate = BW/Tp = 1 x 10^3
.
I am planning to insert this code into the wavetable.hpp to generate the chirp:
If (wave_type == "CHIRP") {
double f_start = 15000000;
double f_end = 35000000;
double interval = 0.000002;
double delta = 0;
double t = 0;
float PI = 3.142;
for (size_t i = 0; i < wave_table_len; i++) {
double delta = i /
(float)wave_table_len;
double t = interval * delta;
double phase = 2 * PI * t *
(f_start + (f_end - f_start) * delta / 2);
real_wave_table[i] =
std::sin(phase);
}
3) The samples required for the chirp is N = tp/ts, correct me if I'm
wrong. But is the ts or sampling frequency fs, the "- -rate" (outgoing samples
to DAC) ?
4) I'm confused at "master_clock_rate" with the "- -rate", if I were to
generate out the chirp mentioned above. What are the rates I have to set for
this two?
Thanks in advance!
From: Humphries, James R. [mailto:humphrie...@ornl.gov]
Sent: Wednesday, 25 April 2018 9:42 PM
To: Yeo Jin Kuang Alvin (IA)
Cc: usrp-users@lists.ettus.com
Subject: RE: UHD C++ Chirp Signal
Hello,
One of the UHD examples is a good place to start. I generated chirp bursts a
little while back using the tx_bursts example as a starting point. Most of what
you need is already there, its just up to you to calculate the samples needed
to generate the chirp and put them into the tx buffer.
https://github.com/EttusResearch/uhd/blob/maint/host/examples/tx_bursts.cpp
I'm happy to help if you have any specific questions on this.
-Trip
From: USRP-users
<usrp-users-boun...@lists.ettus.com<mailto:usrp-users-boun...@lists.ettus.com>>
On Behalf Of Yeo Jin Kuang Alvin (IA) via USRP-users
Sent: Monday, April 23, 2018 10:53 PM
To: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>
Subject: [USRP-users] UHD C++ Chirp Signal
Hi all,
Does anyone know how to create a chirp signal using UHD C++? Are there any code
examples and which files do I need?
Thanks in advance!
_______________________________________________
USRP-users mailing list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
