329 lines
12 KiB
C++
329 lines
12 KiB
C++
#include "portextension.h"
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#include "ui_portextensioneditdialog.h"
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#include <QCheckBox>
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#include <cmath>
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#include <QDebug>
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using namespace std;
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PortExtension::PortExtension()
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: QObject()
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{
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port1.enabled = false;
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port1.frequency = 0;
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port1.loss = 0;
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port1.DCloss = 0;
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port1.delay = 0;
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port1.velocityFactor = 0.66;
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port2.enabled = false;
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port2.frequency = 0;
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port2.loss = 0;
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port2.DCloss = 0;
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port2.delay = 0;
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port2.velocityFactor = 0.66;
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measuring = false;
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kit = nullptr;
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}
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void PortExtension::applyToMeasurement(Protocol::Datapoint &d)
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{
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if(measuring) {
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if(measurements.size() > 0) {
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if(d.pointNum == 0) {
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// sweep complete, evaluate measurement
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double last_phase = 0.0;
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double phasediff_sum = 0.0;
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vector<double> att_x, att_y;
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double avg_x = 0.0, avg_y = 0.0;
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for(auto m : measurements) {
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// grab correct measurement
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complex<double> reflection;
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if(isPort1) {
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reflection = complex<double>(m.real_S11, m.imag_S11);
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} else {
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reflection = complex<double>(m.real_S22, m.imag_S22);
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}
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// remove calkit if specified
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if(!isIdeal) {
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complex<double> calStandard;
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auto standards = kit->toSOLT(m.frequency);
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if(isOpen) {
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calStandard = standards.Open;
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} else {
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calStandard = standards.Short;
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}
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// remove effect of calibration standard
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reflection /= calStandard;
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}
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// sum phase differences to previous point
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auto phase = arg(reflection);
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if(m.pointNum == 0) {
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last_phase = phase;
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} else {
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auto phasediff = phase - last_phase;
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last_phase = phase;
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if(phasediff > M_PI) {
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phasediff -= 2 * M_PI;
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} else if(phasediff <= -M_PI) {
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phasediff += 2 * M_PI;
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}
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phasediff_sum += phasediff;
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qDebug() << phasediff;
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}
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double x = sqrt(m.frequency / measurements.back().frequency);
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double y = 20*log10(abs(reflection));
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att_x.push_back(x);
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att_y.push_back(y);
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avg_x += x;
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avg_y += y;
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}
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auto phase = phasediff_sum / (measurements.size() - 1);
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auto freq_diff = measurements[1].frequency - measurements[0].frequency;
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auto delay = -phase / (2 * M_PI * freq_diff);
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// measured delay is two-way but port extension expects one-way
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delay /= 2;
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// calculate linear regression with transformed square root model
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avg_x /= measurements.size();
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avg_y /= measurements.size();
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double sum_top = 0.0;
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double sum_bottom = 0.0;
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for(unsigned int i=0;i<att_x.size();i++) {
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sum_top += (att_x[i] - avg_x)*(att_y[i] - avg_y);
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sum_bottom += (att_x[i] - avg_x)*(att_x[i] - avg_x);
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}
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double beta = sum_top / sum_bottom;
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double alpha = avg_y - beta * avg_x;
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double DCloss = -alpha / 2;
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double loss = -beta / 2;
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double freq = measurements.back().frequency;
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if(isPort1) {
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ui->P1Time->setValue(delay);
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ui->P1DCloss->setValue(DCloss);
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ui->P1Loss->setValue(loss);
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ui->P1Frequency->setValue(freq);
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} else {
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ui->P2Time->setValue(delay);
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ui->P2DCloss->setValue(DCloss);
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ui->P2Loss->setValue(loss);
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ui->P2Frequency->setValue(freq);
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}
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if(msgBox) {
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msgBox->close();
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msgBox = nullptr;
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}
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measurements.clear();
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} else {
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measurements.push_back(d);
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}
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} else if(d.pointNum == 0) {
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// first point of sweep, start measurement
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measurements.push_back(d);
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}
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}
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if(port1.enabled || port2.enabled) {
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// Convert measurements to complex variables
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auto S11 = complex<double>(d.real_S11, d.imag_S11);
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auto S21 = complex<double>(d.real_S21, d.imag_S21);
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auto S22 = complex<double>(d.real_S22, d.imag_S22);
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auto S12 = complex<double>(d.real_S12, d.imag_S12);
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if(port1.enabled) {
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auto phase = -2 * M_PI * port1.delay * d.frequency;
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auto db_attennuation = port1.DCloss;
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if(port1.frequency != 0) {
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db_attennuation += port1.loss * sqrt(d.frequency / port1.frequency);
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}
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// convert from db to factor
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auto att = pow(10.0, -db_attennuation / 20.0);
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auto correction = polar<double>(att, phase);
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S11 /= correction * correction;
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S21 /= correction;
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S12 /= correction;
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}
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if(port2.enabled) {
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auto phase = -2 * M_PI * port2.delay * d.frequency;
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auto db_attennuation = port2.DCloss;
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if(port2.frequency != 0) {
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db_attennuation += port2.loss * sqrt(d.frequency / port2.frequency);
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}
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// convert from db to factor
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auto att = pow(10.0, -db_attennuation / 20.0);
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auto correction = polar<double>(att, phase);
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S22 /= correction * correction;
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S21 /= correction;
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S12 /= correction;
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}
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d.real_S11 = S11.real();
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d.imag_S11 = S11.imag();
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d.real_S12 = S12.real();
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d.imag_S12 = S12.imag();
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d.real_S21 = S21.real();
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d.imag_S21 = S21.imag();
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d.real_S22 = S22.real();
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d.imag_S22 = S22.imag();
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}
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}
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void PortExtension::edit()
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{
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constexpr double c = 299792458;
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auto dialog = new QDialog();
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ui = new Ui::PortExtensionEditDialog();
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ui->setupUi(dialog);
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// set initial values
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ui->P1Time->setUnit("s");
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ui->P1Time->setPrefixes("pnum ");
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ui->P1Distance->setUnit("m");
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ui->P1Distance->setPrefixes("m ");
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ui->P1DCloss->setUnit("db");
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ui->P1Loss->setUnit("db");
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ui->P1Frequency->setUnit("Hz");
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ui->P1Frequency->setPrefixes(" kMG");
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ui->P1Time->setValue(port1.delay);
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ui->P1Velocity->setValue(port1.velocityFactor);
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ui->P1Distance->setValue(port1.delay * port1.velocityFactor * c);
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ui->P1DCloss->setValue(port1.DCloss);
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ui->P1Loss->setValue(port1.loss);
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ui->P1Frequency->setValue(port1.frequency);
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if(!kit) {
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ui->P1calkit->setEnabled(false);
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}
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ui->P2Time->setUnit("s");
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ui->P2Time->setPrefixes("pnum ");
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ui->P2Distance->setUnit("m");
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ui->P2Distance->setPrefixes("m ");
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ui->P2DCloss->setUnit("db");
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ui->P2Loss->setUnit("db");
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ui->P2Frequency->setUnit("Hz");
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ui->P2Frequency->setPrefixes(" kMG");
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ui->P2Time->setValue(port2.delay);
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ui->P2Velocity->setValue(port2.velocityFactor);
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ui->P2Distance->setValue(port2.delay * port2.velocityFactor * c);
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ui->P2DCloss->setValue(port2.DCloss);
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ui->P2Loss->setValue(port2.loss);
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ui->P2Frequency->setValue(port2.frequency);
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if(!kit) {
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ui->P2calkit->setEnabled(false);
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}
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auto updateValuesFromUI = [=](){
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port1.delay = ui->P1Time->value();
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port1.velocityFactor = ui->P1Velocity->value();
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port1.DCloss = ui->P1DCloss->value();
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port1.loss = ui->P1Loss->value();
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port1.frequency = ui->P1Frequency->value();
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port2.delay = ui->P2Time->value();
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port2.velocityFactor = ui->P2Velocity->value();
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port2.DCloss = ui->P2DCloss->value();
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port2.loss = ui->P2Loss->value();
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port2.frequency = ui->P2Frequency->value();
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};
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// connections to link delay and distance
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connect(ui->P1Time, &SIUnitEdit::valueChanged, [=](double newval) {
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ui->P1Distance->setValueQuiet(newval * ui->P1Velocity->value() * c);
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updateValuesFromUI();
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});
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connect(ui->P1Distance, &SIUnitEdit::valueChanged, [=](double newval) {
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ui->P1Time->setValueQuiet(newval / (ui->P1Velocity->value() * c));
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updateValuesFromUI();
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});
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connect(ui->P1Velocity, &SIUnitEdit::valueChanged, [=](double newval) {
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ui->P1Time->setValueQuiet(ui->P1Distance->value() / (newval * c));
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updateValuesFromUI();
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});
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connect(ui->P1DCloss, &SIUnitEdit::valueChanged, updateValuesFromUI);
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connect(ui->P1Loss, &SIUnitEdit::valueChanged, updateValuesFromUI);
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connect(ui->P1Frequency, &SIUnitEdit::valueChanged, updateValuesFromUI);
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connect(ui->P1short, &QPushButton::pressed, [=](){
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isOpen = false;
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isPort1 = true;
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isIdeal = ui->P1ideal->isChecked();
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startMeasurement();
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});
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connect(ui->P1open, &QPushButton::pressed, [=](){
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isOpen = true;
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isPort1 = true;
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isIdeal = ui->P1ideal->isChecked();
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startMeasurement();
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});
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connect(ui->P2Time, &SIUnitEdit::valueChanged, [=](double newval) {
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ui->P2Distance->setValueQuiet(newval * ui->P2Velocity->value() * c);
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updateValuesFromUI();
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});
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connect(ui->P2Distance, &SIUnitEdit::valueChanged, [=](double newval) {
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ui->P2Time->setValueQuiet(newval / (ui->P2Velocity->value() * c));
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updateValuesFromUI();
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});
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connect(ui->P2Velocity, &SIUnitEdit::valueChanged, [=](double newval) {
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ui->P2Time->setValueQuiet(ui->P2Distance->value() / (newval * c));
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updateValuesFromUI();
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});
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connect(ui->P2DCloss, &SIUnitEdit::valueChanged, updateValuesFromUI);
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connect(ui->P2Loss, &SIUnitEdit::valueChanged, updateValuesFromUI);
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connect(ui->P2Frequency, &SIUnitEdit::valueChanged, updateValuesFromUI);
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connect(ui->P2short, &QPushButton::pressed, [=](){
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isOpen = false;
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isPort1 = false;
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isIdeal = ui->P2ideal->isChecked();
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startMeasurement();
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});
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connect(ui->P2open, &QPushButton::pressed, [=](){
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isOpen = true;
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isPort1 = false;
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isIdeal = ui->P2ideal->isChecked();
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startMeasurement();
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});
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connect(ui->buttonBox, &QDialogButtonBox::accepted, dialog, &QDialog::accept);
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connect(ui->buttonBox, &QDialogButtonBox::rejected, dialog, &QDialog::reject);
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dialog->show();
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}
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void PortExtension::startMeasurement()
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{
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measurements.clear();
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msgBox = new QMessageBox(QMessageBox::Information, "Auto port extension", "Taking measurement...", QMessageBox::Cancel);
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connect(msgBox, &QMessageBox::rejected, [=]() {
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measuring = false;
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measurements.clear();
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});
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msgBox->show();
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measuring = true;
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}
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QToolBar *PortExtension::createToolbar()
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{
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auto tb = new QToolBar("Port Extension");
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auto editButton = new QPushButton("Port Extension");
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auto p1enable = new QCheckBox("Port 1");
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auto p2enable = new QCheckBox("Port 2");
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connect(p1enable, &QCheckBox::clicked, [=]() {
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port1.enabled = p1enable->isChecked();
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});
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connect(p2enable, &QCheckBox::clicked, [=]() {
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port2.enabled = p2enable->isChecked();
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});
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connect(editButton, &QPushButton::pressed, this, &PortExtension::edit);
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tb->addWidget(editButton);
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tb->addWidget(p1enable);
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tb->addWidget(p2enable);
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return tb;
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}
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void PortExtension::setCalkit(Calkit *kit)
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{
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this->kit = kit;
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}
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