kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
122 wiersze
4.5 KiB
Python
122 wiersze
4.5 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 typing import Dict, List
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from PyQt5 import QtWidgets
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import NanoVNASaver.AnalyticTools as at
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from NanoVNASaver.Analysis.Base import Analysis, CUTOFF_VALS
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from NanoVNASaver.Formatting import format_frequency
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logger = logging.getLogger(__name__)
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class HighPassAnalysis(Analysis):
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def __init__(self, app):
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super().__init__(app)
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self.label["octave"] = QtWidgets.QLabel()
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self.label["decade"] = QtWidgets.QLabel()
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for attn in CUTOFF_VALS:
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self.label[f"{attn:.1f}dB"] = QtWidgets.QLabel()
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self.label[f"{attn:.1f}dB"] = QtWidgets.QLabel()
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layout = self.layout
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layout.addRow(self.label["titel"])
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layout.addRow(QtWidgets.QLabel(
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f"Please place {self.app.markers[0].name}"
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f" in the filter passband."))
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layout.addRow("Result:", self.label["result"])
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layout.addRow("Cutoff frequency:", self.label["3.0dB"])
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layout.addRow("-6 dB point:", self.label["6.0dB"])
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layout.addRow("-60 dB point:", self.label["60.0dB"])
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layout.addRow("Roll-off:", self.label["octave"])
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layout.addRow("Roll-off:", self.label["decade"])
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self.set_titel('Highpass analysis')
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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.set_result("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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if (peak := self.find_level(gains)) < 0:
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return
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peak_db = gains[peak]
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logger.debug("Passband position: %d(%fdB)", peak, peak_db)
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cutoff_pos = self.find_cutoffs(gains, peak, peak_db)
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cutoff_freq = {
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att: s21[val].freq if val >= 0 else math.nan
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for att, val in cutoff_pos.items()
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}
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cutoff_gain = {
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att: gains[val] if val >= 0 else math.nan
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for att, val in cutoff_pos.items()
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}
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logger.debug("Cuttoff frequencies: %s", cutoff_freq)
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logger.debug("Cuttoff gains: %s", cutoff_gain)
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octave, decade = at.calculate_rolloff(
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s21, cutoff_pos["10.0dB"], cutoff_pos["20.0dB"])
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if cutoff_gain['3.0dB'] < -4:
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logger.debug("Cutoff frequency found at %f dB"
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" - insufficient data points for true -3 dB point.",
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cutoff_gain)
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logger.debug("Found true cutoff frequency at %d", cutoff_freq['3.0dB'])
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for label, val in cutoff_freq.items():
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self.label[label].setText(
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f"{format_frequency(val)}"
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f" ({cutoff_gain[label]:.1f} dB)")
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self.label['octave'].setText(f'{octave:.3f}dB/octave')
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self.label['decade'].setText(f'{decade:.3f}dB/decade')
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self.app.markers[0].setFrequency(str(s21[peak].freq))
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self.app.markers[1].setFrequency(str(cutoff_freq['3.0dB']))
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self.app.markers[2].setFrequency(str(cutoff_freq['6.0dB']))
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self.set_result(f"Analysis complete ({len(s21)}) points)")
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def find_level(self, gains: List[float]) -> int:
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marker = self.app.markers[0]
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logger.debug("Pass band location: %d", marker.location)
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if marker.location < 0:
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self.set_result(f"Please place {marker.name} in the passband.")
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return -1
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return at.center_from_idx(gains, marker.location)
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def find_cutoffs(self,
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gains: List[float],
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peak: int, peak_db: float) -> Dict[str, int]:
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return {
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f"{attn:.1f}dB": at.cut_off_left(
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gains, peak, peak_db, attn)
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for attn in CUTOFF_VALS
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}
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