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# Conflicts: # NanoVNASaver.py
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| # NanoVNASaver - a python program to view and export Touchstone data from a NanoVNA | ||
| # Copyright (C) 2019. Rune B. Broberg | ||
| # | ||
| # This program is free software: you can redistribute it and/or modify | ||
| # it under the terms of the GNU General Public License as published by | ||
| # the Free Software Foundation, either version 3 of the License, or | ||
| # (at your option) any later version. | ||
| # | ||
| # This program is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| # GNU General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU General Public License | ||
| # along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| import collections | ||
| from PyQt5 import QtWidgets | ||
| from typing import List | ||
| import numpy as np | ||
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| Datapoint = collections.namedtuple('Datapoint', 'freq re im') | ||
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| class CalibrationWindow(QtWidgets.QWidget): | ||
| def __init__(self, app): | ||
| super().__init__() | ||
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| from NanoVNASaver import NanoVNASaver | ||
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| self.app: NanoVNASaver = app | ||
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| self.setMinimumSize(300, 300) | ||
| self.setWindowTitle("Calibration") | ||
| layout = QtWidgets.QVBoxLayout() | ||
| self.setLayout(layout) | ||
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| calibration_status_group = QtWidgets.QGroupBox("Active calibration") | ||
| calibration_status_layout = QtWidgets.QFormLayout() | ||
| self.calibration_status_label = QtWidgets.QLabel("Device calibration") | ||
| calibration_status_layout.addRow("Calibration active: ", self.calibration_status_label) | ||
| calibration_status_group.setLayout(calibration_status_layout) | ||
| layout.addWidget(calibration_status_group) | ||
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| calibration_control_group = QtWidgets.QGroupBox("Calibrate") | ||
| calibration_control_layout = QtWidgets.QFormLayout(calibration_control_group) | ||
| btn_cal_short = QtWidgets.QPushButton("Short") | ||
| btn_cal_short.clicked.connect(self.saveShort) | ||
| self.cal_short_label = QtWidgets.QLabel("Uncalibrated") | ||
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| btn_cal_open = QtWidgets.QPushButton("Open") | ||
| btn_cal_open.clicked.connect(self.saveOpen) | ||
| self.cal_open_label = QtWidgets.QLabel("Uncalibrated") | ||
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| btn_cal_load = QtWidgets.QPushButton("Load") | ||
| btn_cal_load.clicked.connect(self.saveLoad) | ||
| self.cal_load_label = QtWidgets.QLabel("Uncalibrated") | ||
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| btn_cal_through = QtWidgets.QPushButton("Through") | ||
| btn_cal_through.setDisabled(True) | ||
| self.cal_through_label = QtWidgets.QLabel("Uncalibrated") | ||
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| btn_cal_isolation = QtWidgets.QPushButton("Isolation") | ||
| btn_cal_isolation.setDisabled(True) | ||
| self.cal_isolation_label = QtWidgets.QLabel("Uncalibrated") | ||
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| calibration_control_layout.addRow(btn_cal_short, self.cal_short_label) | ||
| calibration_control_layout.addRow(btn_cal_open, self.cal_open_label) | ||
| calibration_control_layout.addRow(btn_cal_load, self.cal_load_label) | ||
| calibration_control_layout.addRow(btn_cal_through, self.cal_through_label) | ||
| calibration_control_layout.addRow(btn_cal_isolation, self.cal_isolation_label) | ||
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| calibration_control_layout.addRow(QtWidgets.QLabel("")) | ||
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| btn_apply = QtWidgets.QPushButton("Apply") | ||
| calibration_control_layout.addRow(btn_apply) | ||
| btn_apply.clicked.connect(self.calculate) | ||
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| btn_reset = QtWidgets.QPushButton("Reset") | ||
| calibration_control_layout.addRow(btn_reset) | ||
| btn_reset.clicked.connect(self.reset) | ||
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| layout.addWidget(calibration_control_group) | ||
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| def saveShort(self): | ||
| self.app.calibration.s11short = self.app.data | ||
| self.cal_short_label.setText("Calibrated") | ||
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| def saveOpen(self): | ||
| self.app.calibration.s11open = self.app.data | ||
| self.cal_open_label.setText("Calibrated") | ||
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| def saveLoad(self): | ||
| self.app.calibration.s11load = self.app.data | ||
| self.cal_load_label.setText("Calibrated") | ||
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| def reset(self): | ||
| self.app.calibration = Calibration() | ||
| self.cal_short_label.setText("Uncalibrated") | ||
| self.cal_open_label.setText("Uncalibrated") | ||
| self.cal_load_label.setText("Uncalibrated") | ||
| self.calibration_status_label.setText("Device calibration") | ||
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| def calculate(self): | ||
| if self.app.calibration.calculateCorrections(): | ||
| self.calibration_status_label.setText("Application calibration") | ||
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| class Calibration: | ||
| s11short: List[Datapoint] = [] | ||
| s11open: List[Datapoint] = [] | ||
| s11load: List[Datapoint] = [] | ||
| s21through: List[Datapoint] = [] | ||
| s21isolation: List[Datapoint] = [] | ||
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| frequencies = [] | ||
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| e00 = [] | ||
| e11 = [] | ||
| deltaE = [] | ||
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| shortIdeal = np.complex(-1, 0) | ||
| openIdeal = np.complex(1, 0) | ||
| loadIdeal = np.complex(0, 0) | ||
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| isCalculated = False | ||
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| def isValid2Port(self): | ||
| return len(self.s21through) > 0 and len(self.s21isolation) > 0 and self.isValid1Port() | ||
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| def isValid1Port(self): | ||
| return len(self.s11short) > 0 and len(self.s11open) > 0 and len(self.s11load) > 0 | ||
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| def calculateCorrections(self): | ||
| if not self.isValid1Port(): | ||
| return False | ||
| self.frequencies = [int] * len(self.s11short) | ||
| self.e00 = [np.complex] * len(self.s11short) | ||
| self.e11 = [np.complex] * len(self.s11short) | ||
| self.deltaE = [np.complex] * len(self.s11short) | ||
| for i in range(len(self.s11short)): | ||
| self.frequencies[i] = self.s11short[i].freq | ||
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| g1 = self.shortIdeal | ||
| g2 = self.openIdeal | ||
| g3 = self.loadIdeal | ||
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| gm1 = np.complex(self.s11short[i].re, self.s11short[i].im) | ||
| gm2 = np.complex(self.s11open[i].re, self.s11open[i].im) | ||
| gm3 = np.complex(self.s11load[i].re, self.s11load[i].im) | ||
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| denominator = g1*(g2-g3)*gm1 + g2*g3*gm2 - g2*g3*gm3 - (g2*gm2-g3*gm3)*g1 | ||
| self.e00[i] = - ((g2*gm3 - g3*gm3)*g1*gm2 - (g2*g3*gm2 - g2*g3*gm3 - (g3*gm2 - g2*gm3)*g1)*gm1) / denominator | ||
| self.e11[i] = ((g2-g3)*gm1-g1*(gm2-gm3)+g3*gm2-g2*gm3) / denominator | ||
| self.deltaE[i] = - ((g1*(gm2-gm3)-g2*gm2+g3*gm3)*gm1+(g2*gm3-g3*gm3)*gm2) / denominator | ||
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| self.isCalculated = True | ||
| return self.isCalculated | ||
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| def correct11(self, re, im, freq): | ||
| s11m = np.complex(re, im) | ||
| distance = 10**10 | ||
| index = 0 | ||
| for i in range(len(self.s11short)): | ||
| if abs(self.s11short[i].freq - freq) < distance: | ||
| index = i | ||
| distance = abs(self.s11short[i].freq - freq) | ||
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| s11 = (s11m - self.e00[index]) / ((s11m * self.e11[index]) - self.deltaE[index]) | ||
| return s11.real, s11.imag |
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