​Hello. I use B200 to scan the spectrum in a certain band. I have two
problems.
1) the last part of the collection of the spectrum becomes the beginning. Fig.
1
2) the switching time from frequency to frequency is alternated
0.00305509567261
0.0539989471436
0.00493001937866
0.054967880249
0.0047459602356
0.055587053299
I enclose to you my code in python
import numpy as np
from uhd import libpyuhd as lib
import time
list = [400e6, 450e6, 550e6, 600e6]
def initialization_usrp():
usrp = lib.usrp.multi_usrp(" ")
global usrp
def preinstall():
st_args = lib.usrp.stream_args("fc32", "sc16")
streamer = usrp.get_rx_stream(st_args)
stream_cmd = lib.types.stream_cmd(lib.types.stream_mode.num_done)
recv_buff = np.zeros(8192, dtype=np.complex64)
usrp.set_rx_gain(60, 0)
usrp.set_rx_rate(56e6)
usrp.set_rx_bandwidth(56e6)
metadata_rx = lib.types.rx_metadata()
stream_cmd.num_samps = 8192
stream_cmd.stream_now = True
streamer.issue_stream_cmd(stream_cmd)
global streamer, recv_buff, stream_cmd,metadata_rx
def reciever():
buffs = np.array([])
for i in list:
start = time.time()
usrp.set_rx_freq(lib.types.tune_request(i))
print(time.time() - start)
streamer.recv(recv_buff, metadata_rx)
if metadata_rx.error_code == lib.types.rx_metadata_error_code.timeout:
print ("ERRROR")
elif metadata_rx.error_code == lib.types.rx_metadata_error_code.late:
print ("ERR1")
elif metadata_rx.error_code ==
lib.types.rx_metadata_error_code.broken_chain:
print ("ERR2")
elif metadata_rx.error_code ==
lib.types.rx_metadata_error_code.overflow:
print ("ERR3")
elif metadata_rx.error_code ==
lib.types.rx_metadata_error_code.alignment:
print ("ERR4")
elif metadata_rx.error_code ==
lib.types.rx_metadata_error_code.bad_packet:
print ("ERR5")
stream_cmd.time_spec = lib.types.time_spec(0)
streamer.issue_stream_cmd(stream_cmd)
PSD = 10.0 *
np.log10(np.abs(np.fft.fftshift(np.fft.fft(recv_buff, 1024) /
float(1024))) ** 2)
buffs = np.append(buffs, PSD)
# if buffs.size == 4 * 8192:
# # global recv_buff
return buffs
# else:
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