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sdrangel/sdrbase/util/vlftransmitters.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2024 Jon Beniston, M7RCE <jon@beniston.com> //
// //
// 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 as 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <QFile>
#include <QTextStream>
#include <QStandardPaths>
#include <QDebug>
#include "util/csv.h"
#include "vlftransmitters.h"
// https://sidstation.loudet.org/stations-list-en.xhtml
// https://core.ac.uk/download/pdf/224769021.pdf -- Table 1
// GQD/GQZ callsigns: https://groups.io/g/VLF/message/19212?p=%2C%2C%2C20%2C0%2C0%2C0%3A%3Arecentpostdate%2Fsticky%2C%2C19.6%2C20%2C2%2C0%2C38924431
QList<VLFTransmitters::Transmitter> VLFTransmitters::m_transmitters = {
{QStringLiteral("JXN"), 16400, 66.974353, 13.873617, -1}, // Novik, Norway (Only transmits 6 times a day)
{QStringLiteral("VTX2"), 17000, 8.387015, 77.752762, -1}, // South Vijayanarayanam, India
{QStringLiteral("RDL"), 18100, 44.773333, 39.547222, -1}, // Krasnodar, Russia (Transmits short bursts, possibly FSK)
{QStringLiteral("GQD"), 19580, 54.911643, -3.278456, 100}, // Anthorn, UK, Often referred to as GBZ
{QStringLiteral("NWC"), 19800, -21.816325, 114.16546, 1000}, // Exmouth, Aus
{QStringLiteral("ICV"), 20270, 40.922946, 9.731881, 50}, // Isola di Tavolara, Italy (Can be distorted on 3D map if terrain used)
{QStringLiteral("FTA"), 20900, 48.544632, 2.579429, 50}, // Sainte-Assise, France (Satellite imagary obfuscated)
{QStringLiteral("NPM"), 21400, 21.420166, -158.151140, 600}, // Pearl Harbour, Lualuahei, USA (Not seen?)
{QStringLiteral("HWU"), 21750, 46.713129, 1.245248, 200}, // Rosnay, France
{QStringLiteral("GQZ"), 22100, 54.731799, -2.883033, 100}, // Skelton, UK (GVT in paper)
{QStringLiteral("DHO38"), 23400, 53.078900, 7.615000, 300}, // Rhauderfehn, Germany - Off air 7-8 UTC
{QStringLiteral("NAA"), 24000, 44.644506, -67.284565, 1000}, // Cutler, Maine, USA
{QStringLiteral("TBB"), 26700, 37.412725, 27.323342, -1}, // Bafa, Turkey
{QStringLiteral("TFK/NRK"), 37500, 63.850365, -22.466773, 100}, // Grindavik, Iceland
{QStringLiteral("SRC"), 40400, 57.120328, 16.153083, -1}, // Grimeton, Sweden
{QStringLiteral("NSY"), 45900, 37.125660, 14.436416, -1}, // Niscemi, Italy
{QStringLiteral("SXA"), 49000, 38.145155, 24.019718, -1}, // Marathon, Greece
{QStringLiteral("GYW1"), 51950, 57.617463, -1.887589, -1}, // Crimond, UK
{QStringLiteral("FUE"), 65800, 48.637673, -4.350758, -1}, // Kerlouan, France
};
QHash<QString, const VLFTransmitters::Transmitter*> VLFTransmitters::m_callsignHash;
VLFTransmitters::Init VLFTransmitters::m_init;
VLFTransmitters::Init::Init()
{
// Get directory to store app data in
QStringList locations = QStandardPaths::standardLocations(QStandardPaths::AppDataLocation);
// First dir is writable
QString dir = locations[0];
// Try reading transmitters from .csv file
QString filename = QString("%1/%2/%3/vlftransmitters.csv").arg(dir).arg(COMPANY).arg(APPLICATION_NAME); // Because this method is called before main(), we need to add f4exb/SDRangel
QFile file(filename);
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
QTextStream in(&file);
QString error;
QHash<QString, int> colIndexes = CSV::readHeader(in, {
QStringLiteral("Callsign"),
QStringLiteral("Frequency"),
QStringLiteral("Latitude"),
QStringLiteral("Longitude"),
QStringLiteral("Power")
}, error);
if (error.isEmpty())
{
QStringList cols;
int callsignCol = colIndexes.value(QStringLiteral("Callsign"));
int frequencyCol = colIndexes.value(QStringLiteral("Frequency"));
int latitudeCol = colIndexes.value(QStringLiteral("Latitude"));
int longitudeCol = colIndexes.value(QStringLiteral("Longitude"));
int powerCol = colIndexes.value(QStringLiteral("Power"));
int maxCol = std::max({callsignCol, frequencyCol, latitudeCol, longitudeCol, powerCol});
m_transmitters.clear(); // Replace builtin list
while(CSV::readRow(in, &cols))
{
if (cols.size() > maxCol)
{
Transmitter transmitter;
transmitter.m_callsign = cols[callsignCol];
transmitter.m_frequency = cols[frequencyCol].toLongLong();
transmitter.m_latitude = cols[latitudeCol].toFloat();
transmitter.m_longitude = cols[longitudeCol].toFloat();
transmitter.m_power = cols[powerCol].toInt();
m_transmitters.append(transmitter);
}
}
}
else
{
qWarning() << filename << "did not contain expected headers.";
}
}
// Create hash table for faster searching
for (const auto& transmitter : VLFTransmitters::m_transmitters) {
VLFTransmitters::m_callsignHash.insert(transmitter.m_callsign, &transmitter);
}
}