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Add decoding of surface position messages

This commit is contained in:
Jon Beniston 2020-11-11 09:19:37 +00:00
parent 27c4802a7f
commit f823741b34
1 changed files with 96 additions and 15 deletions
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111
plugins/channelrx/demodadsb/adsbdemodgui.cpp
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@ -763,23 +763,104 @@ void ADSBDemodGUI::handleADSB(
aircraft->m_flight = QString(callsign);
aircraft->m_flightItem->setText(aircraft->m_flight);
}
else if ((tc >= 5) && (tc <= 8))
else if (((tc >= 5) && (tc <= 18)) || ((tc >= 20) && (tc <= 22)))
{
// Surface position
}
else if (((tc >= 9) && (tc <= 18)) || ((tc >= 20) && (tc <= 22)))
{
// Airbourne position (9-18 baro, 20-22 GNSS)
int ss = (data[4] >> 1) & 0x3; // Surveillance status
int nicsb = data[4] & 1; // NIC supplement-B
int alt = ((data[5] & 0xff) << 4) | ((data[6] >> 4) & 0xf); // Altitude
int n = ((alt >> 1) & 0x7f0) | (alt & 0xf);
int alt_ft = n * ((alt & 0x10) ? 25 : 100) - 1000;
if ((tc >= 5) && (tc <= 8))
{
// Surface position
aircraft->m_altitude = alt_ft;
aircraft->m_altitudeValid = true;
// setData rather than setText so it sorts numerically
aircraft->m_altitudeItem->setData(Qt::DisplayRole, m_settings.m_siUnits ? feetToMetresInt(aircraft->m_altitude) : aircraft->m_altitude);
// Set altitude to 0, if we're on the surface
// Actual altitude may of course depend on airport elevation
aircraft->m_altitudeValid = true;
aircraft->m_altitudeItem->setData(Qt::DisplayRole, 0);
int movement = ((data[4] & 0x7) << 4) | ((data[5] >> 4) & 0xf);
if (movement == 0)
{
// No information available
aircraft->m_speedValid = false;
aircraft->m_speedItem->setData(Qt::DisplayRole, "");
}
else if (movement == 1)
{
// Aircraft stopped
aircraft->m_speedValid = true;
aircraft->m_speedItem->setData(Qt::DisplayRole, 0);
}
else if ((movement >= 2) && (movement <= 123))
{
float base, step; // In knts
int adjust;
if ((movement >= 2) && (movement <= 8))
{
base = 0.125f;
step = 0.125f;
adjust = 2;
}
else if ((movement >= 9) && (movement <= 12))
{
base = 1.0f;
step = 0.25f;
adjust = 9;
}
else if ((movement >= 13) && (movement <= 38))
{
base = 2.0f;
step = 0.5f;
adjust = 13;
}
else if ((movement >= 39) && (movement <= 93))
{
base = 15.0f;
step = 1.0f;
adjust = 39;
}
else if ((movement >= 94) && (movement <= 108))
{
base = 70.0f;
step = 2.0f;
adjust = 94;
}
else
{
base = 100.0f;
step = 5.0f;
adjust = 109;
}
float speed = base + (movement - adjust) * step;
aircraft->m_speedType = Aircraft::GS;
aircraft->m_speedValid = true;
aircraft->m_speedItem->setData(Qt::DisplayRole, m_settings.m_siUnits ? knotsToKPHInt(aircraft->m_speed) : (int)std::round(aircraft->m_speed));
}
else if (movement == 124)
{
aircraft->m_speedValid = true;
aircraft->m_speedItem->setData(Qt::DisplayRole, m_settings.m_siUnits ? 324 : 175); // Actually greater than this
}
int groundTrackStatus = (data[5] >> 3) & 1;
int groundTrackValue = ((data[5] & 0x7) << 4) | ((data[6] >> 4) & 0xf);
if (groundTrackStatus)
{
aircraft->m_heading = std::round((groundTrackValue * 360.0/128.0));
aircraft->m_headingValid = true;
aircraft->m_headingItem->setData(Qt::DisplayRole, aircraft->m_heading);
}
}
else if (((tc >= 9) && (tc <= 18)) || ((tc >= 20) && (tc <= 22)))
{
// Airbourne position (9-18 baro, 20-22 GNSS)
int ss = (data[4] >> 1) & 0x3; // Surveillance status
int nicsb = data[4] & 1; // NIC supplement-B - Or single antenna flag
int alt = ((data[5] & 0xff) << 4) | ((data[6] >> 4) & 0xf); // Altitude
int n = ((alt >> 1) & 0x7f0) | (alt & 0xf);
int alt_ft = n * ((alt & 0x10) ? 25 : 100) - 1000;
aircraft->m_altitude = alt_ft;
aircraft->m_altitudeValid = true;
// setData rather than setText so it sorts numerically
aircraft->m_altitudeItem->setData(Qt::DisplayRole, m_settings.m_siUnits ? feetToMetresInt(aircraft->m_altitude) : aircraft->m_altitude);
}
int t = (data[6] >> 3) & 1; // Time synchronisation to UTC
int f = (data[6] >> 2) & 1; // CPR odd/even frame - should alternate every 0.2s