kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
Kevin Zembower
GitHub
rodzic
6a5b662b05
commit
eaf64cd575
162
TDR.py
162
TDR.py
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# 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 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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import numpy as np
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import scipy.signal as signal
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from PyQt5 import QtWidgets, QtCore
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logger = logging.getLogger(__name__)
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class TDRWindow(QtWidgets.QWidget):
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updated = QtCore.pyqtSignal()
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def __init__(self, app: QtWidgets.QWidget):
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super().__init__()
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self.app = app
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self.td = []
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self.distance_axis = []
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self.step_response = []
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self.step_response_Z = []
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self.setWindowTitle("TDR")
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self.setWindowIcon(self.app.icon)
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QtWidgets.QShortcut(QtCore.Qt.Key_Escape, self, self.hide)
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layout = QtWidgets.QFormLayout()
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self.setLayout(layout)
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self.tdr_velocity_dropdown = QtWidgets.QComboBox()
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self.tdr_velocity_dropdown.addItem("Jelly filled (0.64)", 0.64)
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self.tdr_velocity_dropdown.addItem("Polyethylene (0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem("PTFE (Teflon) (0.70)", 0.70)
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self.tdr_velocity_dropdown.addItem("Pulp Insulation (0.72)", 0.72)
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self.tdr_velocity_dropdown.addItem("Foam or Cellular PE (0.78)", 0.78)
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self.tdr_velocity_dropdown.addItem("Semi-solid PE (SSPE) (0.84)", 0.84)
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self.tdr_velocity_dropdown.addItem("Air (Helical spacers) (0.94)", 0.94)
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self.tdr_velocity_dropdown.insertSeparator(self.tdr_velocity_dropdown.count())
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# Lots of cable types added by Larry Goga, AE5CZ
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self.tdr_velocity_dropdown.addItem("RG-6/U PE 75\N{OHM SIGN} (Belden 8215) (0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem("RG-6/U Foam 75\N{OHM SIGN} (Belden 9290) (0.81)", 0.81)
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self.tdr_velocity_dropdown.addItem("RG-8/U PE 50\N{OHM SIGN} (Belden 8237) (0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem("RG-8/U Foam (Belden 8214) (0.78)", 0.78)
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self.tdr_velocity_dropdown.addItem("RG-8/U (Belden 9913) (0.84)", 0.84)
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# Next one added by EKZ, KC3KZ, from measurement of actual cable
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self.tdr_velocity_dropdown.addItem("RG-8/U (Shireen RFC®400 Low Loss) (0.86)", 0.86)
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self.tdr_velocity_dropdown.addItem("RG-8X (Belden 9258) (0.82)", 0.82)
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# Next three added by EKZ, KC3KZ, from measurement of actual cable
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self.tdr_velocity_dropdown.addItem("RG-8X (Wireman \"Super 8\" CQ106) (0.81)", 0.81)
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self.tdr_velocity_dropdown.addItem("RG-8X (Wireman \"MINI-8 Lo-Loss\" CQ118) (0.82)", 0.82)
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self.tdr_velocity_dropdown.addItem(
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"RG-58 (Wireman \"CQ 58 Lo-Loss Flex\" CQ129FF) (0.79)", 0.79)
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self.tdr_velocity_dropdown.addItem(
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"RG-11/U 75\N{OHM SIGN} Foam HDPE (Belden 9292) (0.84)", 0.84)
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self.tdr_velocity_dropdown.addItem("RG-58/U 52\N{OHM SIGN} PE (Belden 9201) (0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem(
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"RG-58A/U 54\N{OHM SIGN} Foam (Belden 8219) (0.73)", 0.73)
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self.tdr_velocity_dropdown.addItem("RG-59A/U PE 75\N{OHM SIGN} (Belden 8241) (0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem(
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"RG-59A/U Foam 75\N{OHM SIGN} (Belden 8241F) (0.78)", 0.78)
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self.tdr_velocity_dropdown.addItem("RG-174 PE (Belden 8216)(0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem("RG-174 Foam (Belden 7805R) (0.735)", 0.735)
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self.tdr_velocity_dropdown.addItem("RG-213/U PE (Belden 8267) (0.66)", 0.66)
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self.tdr_velocity_dropdown.addItem("RG316 (0.695)", 0.695)
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self.tdr_velocity_dropdown.addItem("RG402 (0.695)", 0.695)
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self.tdr_velocity_dropdown.addItem("LMR-240 (0.84)", 0.84)
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self.tdr_velocity_dropdown.addItem("LMR-240UF (0.80)", 0.80)
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self.tdr_velocity_dropdown.addItem("LMR-400 (0.85)", 0.85)
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self.tdr_velocity_dropdown.addItem("LMR400UF (0.83)", 0.83)
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self.tdr_velocity_dropdown.addItem("Davis Bury-FLEX (0.82)", 0.82)
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self.tdr_velocity_dropdown.insertSeparator(self.tdr_velocity_dropdown.count())
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self.tdr_velocity_dropdown.addItem("Custom", -1)
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self.tdr_velocity_dropdown.setCurrentIndex(1) # Default to PE (0.66)
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self.tdr_velocity_dropdown.currentIndexChanged.connect(self.updateTDR)
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layout.addRow(self.tdr_velocity_dropdown)
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self.tdr_velocity_input = QtWidgets.QLineEdit()
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self.tdr_velocity_input.setDisabled(True)
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self.tdr_velocity_input.setText("0.66")
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self.tdr_velocity_input.textChanged.connect(self.app.dataUpdated)
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layout.addRow("Velocity factor", self.tdr_velocity_input)
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self.tdr_result_label = QtWidgets.QLabel()
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layout.addRow("Estimated cable length:", self.tdr_result_label)
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layout.addRow(self.app.tdr_chart)
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def updateTDR(self):
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c = 299792458
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# TODO: Let the user select whether to use high or low resolution TDR?
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FFT_POINTS = 2**14
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if len(self.app.data11) < 2:
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return
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if self.tdr_velocity_dropdown.currentData() == -1:
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self.tdr_velocity_input.setDisabled(False)
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else:
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self.tdr_velocity_input.setDisabled(True)
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self.tdr_velocity_input.setText(str(self.tdr_velocity_dropdown.currentData()))
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try:
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v = float(self.tdr_velocity_input.text())
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except ValueError:
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return
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step_size = self.app.data11[1].freq - self.app.data11[0].freq
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if step_size == 0:
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self.tdr_result_label.setText("")
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logger.info("Cannot compute cable length at 0 span")
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return
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s11 = []
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for d in self.app.data11:
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s11.append(np.complex(d.re, d.im))
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window = np.blackman(len(self.app.data11))
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windowed_s11 = window * s11
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self.td = np.abs(np.fft.ifft(windowed_s11, FFT_POINTS))
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step = np.ones(FFT_POINTS)
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self.step_response = signal.convolve(self.td, step)
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self.step_response_Z = 50 * (1 + self.step_response) / (1 - self.step_response)
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time_axis = np.linspace(0, 1/step_size, FFT_POINTS)
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self.distance_axis = time_axis * v * c
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# peak = np.max(td)
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# We should check that this is an actual *peak*, and not just a vague maximum
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index_peak = np.argmax(self.td)
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cable_len = round(self.distance_axis[index_peak]/2, 3)
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feet = math.floor(cable_len / 0.3048)
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inches = round(((cable_len / 0.3048) - feet)*12, 1)
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self.tdr_result_label.setText(f"{cable_len}m ({feet}ft {inches}in)")
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self.app.tdr_result_label.setText(str(cable_len) + " m")
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self.updated.emit()
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