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Mlat synthetic message detection.

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Notice synthetic mlat messages by looking for messages with a magic
timestamp value. If they arrive, tag the derived data as mlat-derived.

Don't include mlat-derived output in FATSV output to avoid loops.
This commit is contained in:
Oliver Jowett 2015-06-28 20:04:09 +01:00
parent 8f08c1b87f
commit 12a7d45e75
6 changed files with 33 additions and 7 deletions
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19
net_io.c
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@ -1513,6 +1513,8 @@ static void writeFATSV()
char *p, *end;
int flags;
// skip non-ICAO
if (a->addr & MODES_NON_ICAO_ADDRESS)
continue;
@ -1527,16 +1529,19 @@ static void writeFATSV()
emittedAge = (now - a->fatsv_last_emitted);
if (a->bFlags & MODES_ACFLAGS_ALTITUDE_VALID) {
// ignore all mlat-derived data
flags = a->bFlags & ~a->mlatFlags;
if (flags & MODES_ACFLAGS_ALTITUDE_VALID) {
alt = a->altitude;
altAge = now - a->seenAltitude;
altValid = (altAge <= 30000);
}
if (a->bFlags & MODES_ACFLAGS_AOG_VALID) {
if (flags & MODES_ACFLAGS_AOG_VALID) {
groundValid = 1;
if (a->bFlags & MODES_ACFLAGS_AOG) {
if (flags & MODES_ACFLAGS_AOG) {
// force zero altitude on ground
alt = 0;
altValid = 1;
@ -1545,17 +1550,17 @@ static void writeFATSV()
}
}
if (a->bFlags & MODES_ACFLAGS_LATLON_VALID) {
if (flags & MODES_ACFLAGS_LATLON_VALID) {
latlonAge = now - a->seenLatLon;
latlonValid = (latlonAge <= 30000);
}
if (a->bFlags & MODES_ACFLAGS_HEADING_VALID) {
if (flags & MODES_ACFLAGS_HEADING_VALID) {
trackAge = now - a->seenTrack;
trackValid = (trackAge <= 30000);
}
if (a->bFlags & MODES_ACFLAGS_SPEED_VALID) {
if (flags & MODES_ACFLAGS_SPEED_VALID) {
speedAge = now - a->seenSpeed;
speedValid = (speedAge <= 30000);
}
@ -1604,7 +1609,7 @@ static void writeFATSV()
p += snprintf(p, bufsize(p,end), "\tident\t%s", a->flight);
}
if (a->bFlags & MODES_ACFLAGS_SQUAWK_VALID) {
if (flags & MODES_ACFLAGS_SQUAWK_VALID) {
p += snprintf(p, bufsize(p,end), "\tsquawk\t%04x", a->modeA);
}