kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
281 wiersze
12 KiB
Python
281 wiersze
12 KiB
Python
# NanoVNASaver
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#
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# A python program to view and export Touchstone data from a NanoVNA
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# Copyright (C) 2019, 2020 Rune B. Broberg
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# Copyright (C) 2020,2021 NanoVNA-Saver Authors
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import logging
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import math
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from PyQt5 import QtWidgets
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from NanoVNASaver.Analysis.BandPassAnalysis import BandPassAnalysis
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from NanoVNASaver.Formatting import format_frequency
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logger = logging.getLogger(__name__)
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class BandStopAnalysis(BandPassAnalysis):
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def __init__(self, app):
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super().__init__(app)
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self._widget = QtWidgets.QWidget()
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layout = QtWidgets.QFormLayout()
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self._widget.setLayout(layout)
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layout.addRow(QtWidgets.QLabel("Band stop filter analysis"))
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self.result_label = QtWidgets.QLabel()
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self.lower_cutoff_label = QtWidgets.QLabel()
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self.lower_six_db_label = QtWidgets.QLabel()
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self.lower_sixty_db_label = QtWidgets.QLabel()
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self.lower_db_per_octave_label = QtWidgets.QLabel()
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self.lower_db_per_decade_label = QtWidgets.QLabel()
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self.upper_cutoff_label = QtWidgets.QLabel()
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self.upper_six_db_label = QtWidgets.QLabel()
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self.upper_sixty_db_label = QtWidgets.QLabel()
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self.upper_db_per_octave_label = QtWidgets.QLabel()
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self.upper_db_per_decade_label = QtWidgets.QLabel()
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layout.addRow("Result:", self.result_label)
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layout.addRow(QtWidgets.QLabel(""))
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self.center_frequency_label = QtWidgets.QLabel()
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self.span_label = QtWidgets.QLabel()
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self.six_db_span_label = QtWidgets.QLabel()
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self.quality_label = QtWidgets.QLabel()
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layout.addRow("Center frequency:", self.center_frequency_label)
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layout.addRow("Bandwidth (-3 dB):", self.span_label)
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layout.addRow("Quality factor:", self.quality_label)
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layout.addRow("Bandwidth (-6 dB):", self.six_db_span_label)
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layout.addRow(QtWidgets.QLabel(""))
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layout.addRow(QtWidgets.QLabel("Lower side:"))
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layout.addRow("Cutoff frequency:", self.lower_cutoff_label)
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layout.addRow("-6 dB point:", self.lower_six_db_label)
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layout.addRow("-60 dB point:", self.lower_sixty_db_label)
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layout.addRow("Roll-off:", self.lower_db_per_octave_label)
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layout.addRow("Roll-off:", self.lower_db_per_decade_label)
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layout.addRow(QtWidgets.QLabel(""))
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layout.addRow(QtWidgets.QLabel("Upper side:"))
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layout.addRow("Cutoff frequency:", self.upper_cutoff_label)
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layout.addRow("-6 dB point:", self.upper_six_db_label)
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layout.addRow("-60 dB point:", self.upper_sixty_db_label)
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layout.addRow("Roll-off:", self.upper_db_per_octave_label)
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layout.addRow("Roll-off:", self.upper_db_per_decade_label)
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def reset(self):
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self.result_label.clear()
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self.span_label.clear()
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self.quality_label.clear()
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self.six_db_span_label.clear()
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self.upper_cutoff_label.clear()
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self.upper_six_db_label.clear()
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self.upper_sixty_db_label.clear()
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self.upper_db_per_octave_label.clear()
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self.upper_db_per_decade_label.clear()
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self.lower_cutoff_label.clear()
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self.lower_six_db_label.clear()
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self.lower_sixty_db_label.clear()
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self.lower_db_per_octave_label.clear()
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self.lower_db_per_decade_label.clear()
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def runAnalysis(self):
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if not self.app.data.s21:
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logger.debug("No data to analyse")
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self.result_label.setText("No data to analyse.")
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return
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self.reset()
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s21 = self.app.data.s21
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gains = [d.gain for d in s21]
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peak_location, pass_band_db = max(enumerate(gains), key=lambda i: i[1])
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logger.debug("Found peak of %f at %d",
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pass_band_db, s21[peak_location].freq)
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lower_cutoff_location = next(
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(i for i in range(len(s21)) if (pass_band_db - s21[i].gain) > 3), -1)
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lower_cutoff_frequency = s21[lower_cutoff_location].freq
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lower_cutoff_gain = (
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s21[lower_cutoff_location].gain - pass_band_db)
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if lower_cutoff_gain < -4:
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logger.debug("Lower cutoff frequency found at %f dB"
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" - insufficient data points for true -3 dB point.",
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lower_cutoff_gain)
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logger.debug("Found true lower cutoff frequency at %d",
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lower_cutoff_frequency)
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self.lower_cutoff_label.setText(
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f"{format_frequency(lower_cutoff_frequency)}"
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f" ({round(lower_cutoff_gain, 1)} dB)")
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self.app.markers[1].setFrequency(str(lower_cutoff_frequency))
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self.app.markers[1].frequencyInput.setText(str(lower_cutoff_frequency))
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upper_cutoff_location = next((i for i in range(
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len(s21) - 1, -1, -1) if (pass_band_db - s21[i].gain) > 3), -1)
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upper_cutoff_frequency = (
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s21[upper_cutoff_location].freq)
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upper_cutoff_gain = (
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s21[upper_cutoff_location].gain - pass_band_db)
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if upper_cutoff_gain < -4:
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logger.debug("Upper cutoff frequency found at %f dB"
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" - insufficient data points for true -3 dB point.",
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upper_cutoff_gain)
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logger.debug("Found true upper cutoff frequency at %d",
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upper_cutoff_frequency)
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self.upper_cutoff_label.setText(
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f"{format_frequency(upper_cutoff_frequency)}"
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f" ({round(upper_cutoff_gain, 1)} dB)")
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self.app.markers[2].setFrequency(str(upper_cutoff_frequency))
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self.app.markers[2].frequencyInput.setText(str(upper_cutoff_frequency))
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span = upper_cutoff_frequency - lower_cutoff_frequency
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center_frequency = math.sqrt(
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lower_cutoff_frequency * upper_cutoff_frequency)
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q = center_frequency / span
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self.span_label.setText(format_frequency(span))
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self.center_frequency_label.setText(
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format_frequency(center_frequency))
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self.quality_label.setText(str(round(q, 2)))
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self.app.markers[0].setFrequency(str(round(center_frequency)))
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self.app.markers[0].frequencyInput.setText(
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str(round(center_frequency)))
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lower_six_db_location = next((i for i in range(
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lower_cutoff_location, len(s21)) if (pass_band_db - s21[i].gain) > 6), -1)
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if lower_six_db_location < 0:
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self.result_label.setText("Lower 6 dB location not found.")
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return
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lower_six_db_cutoff_frequency = (
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s21[lower_six_db_location].freq)
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self.lower_six_db_label.setText(
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format_frequency(lower_six_db_cutoff_frequency))
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ten_db_location = next((i for i in range(lower_cutoff_location, len(
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s21)) if (pass_band_db - s21[i].gain) > 10), -1)
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twenty_db_location = next((i for i in range(
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lower_cutoff_location, len(s21)) if (pass_band_db - s21[i].gain) > 20), -1)
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sixty_db_location = next((i for i in range(
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lower_six_db_location, len(s21)) if (pass_band_db - s21[i].gain) > 60), -1)
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if sixty_db_location > 0:
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sixty_db_cutoff_frequency = (
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s21[sixty_db_location].freq)
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self.lower_sixty_db_label.setText(
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format_frequency(sixty_db_cutoff_frequency))
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elif ten_db_location != -1 and twenty_db_location != -1:
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ten = s21[ten_db_location].freq
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twenty = s21[twenty_db_location].freq
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sixty_db_frequency = ten * \
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10 ** (5 * (math.log10(twenty) - math.log10(ten)))
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self.lower_sixty_db_label.setText(
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f"{format_frequency(sixty_db_frequency)} (derived)")
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else:
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self.lower_sixty_db_label.setText("Not calculated")
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if (ten_db_location > 0 and
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twenty_db_location > 0 and
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ten_db_location != twenty_db_location):
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octave_attenuation, decade_attenuation = self.calculateRolloff(
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ten_db_location, twenty_db_location)
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self.lower_db_per_octave_label.setText(
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f"{round(octave_attenuation, 3)} dB / octave")
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self.lower_db_per_decade_label.setText(
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f"{round(decade_attenuation, 3)} dB / decade")
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else:
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self.lower_db_per_octave_label.setText("Not calculated")
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self.lower_db_per_decade_label.setText("Not calculated")
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upper_six_db_location = next((i for i in range(
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upper_cutoff_location, -1, -1) if (pass_band_db - s21[i].gain) > 6), -1)
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if upper_six_db_location < 0:
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self.result_label.setText("Upper 6 dB location not found.")
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return
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upper_six_db_cutoff_frequency = (
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s21[upper_six_db_location].freq)
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self.upper_six_db_label.setText(
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format_frequency(upper_six_db_cutoff_frequency))
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six_db_span = (
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upper_six_db_cutoff_frequency - lower_six_db_cutoff_frequency)
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self.six_db_span_label.setText(
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format_frequency(six_db_span))
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ten_db_location = next((i for i in range(
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upper_cutoff_location, -1, -1) if (pass_band_db - s21[i].gain) > 10), -1)
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twenty_db_location = next((i for i in range(
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upper_cutoff_location, -1, -1) if (pass_band_db - s21[i].gain) > 20), -1)
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sixty_db_location = next((i for i in range(
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upper_six_db_location, -1, -1) if (pass_band_db - s21[i].gain) > 60), -1)
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if sixty_db_location > 0:
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sixty_db_cutoff_frequency = (
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s21[sixty_db_location].freq)
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self.upper_sixty_db_label.setText(
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format_frequency(sixty_db_cutoff_frequency))
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elif ten_db_location != -1 and twenty_db_location != -1:
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ten = s21[ten_db_location].freq
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twenty = s21[twenty_db_location].freq
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sixty_db_frequency = ten * 10 ** (
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5 * (math.log10(twenty) - math.log10(ten)))
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self.upper_sixty_db_label.setText(
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f"{format_frequency(sixty_db_frequency)} (derived)")
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else:
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self.upper_sixty_db_label.setText("Not calculated")
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if (ten_db_location > 0 and
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twenty_db_location > 0 and
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ten_db_location != twenty_db_location):
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octave_attenuation, decade_attenuation = self.calculateRolloff(
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ten_db_location, twenty_db_location)
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self.upper_db_per_octave_label.setText(
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f"{round(octave_attenuation, 3)} dB / octave")
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self.upper_db_per_decade_label.setText(
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f"{round(decade_attenuation, 3)} dB / decade")
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else:
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self.upper_db_per_octave_label.setText("Not calculated")
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self.upper_db_per_decade_label.setText("Not calculated")
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if upper_cutoff_gain < -4 or lower_cutoff_gain < -4:
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self.result_label.setText(
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f"Analysis complete ({len(self.app.data.s11)} points)\n"
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f"Insufficient data for analysis. Increase segment count.")
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return
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self.result_label.setText(
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f"Analysis complete ({len(self.app.data.s11)} points)")
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