static int testCPRRelative() {
int ok = 1;
unsigned i;
for (i = 0; i < sizeof(cprRelativeTests)/sizeof(cprRelativeTests[0]); ++i) {
double rlat = 0, rlon = 0;
int res;
res = decodeCPRrelative(cprRelativeTests[i].reflat, cprRelativeTests[i].reflon,
cprRelativeTests[i].cprlat, cprRelativeTests[i].cprlon,
cprRelativeTests[i].fflag, cprRelativeTests[i].surface,
&rlat, &rlon);
if (res != cprRelativeTests[i].result
|| fabs(rlat - cprRelativeTests[i].rlat) > 1e-6
|| fabs(rlon - cprRelativeTests[i].rlon) > 1e-6) {
ok = 0;
fprintf(stderr,
"testCPRRelative[%d]: FAIL: decodeCPRrelative(%.6f,%.6f,%d,%d,%d,%d) failed:\n"
" result %d (expected %d)\n"
" lat %.6f (expected %.6f)\n"
" lon %.6f (expected %.6f)\n",
i,
cprRelativeTests[i].reflat, cprRelativeTests[i].reflon,
cprRelativeTests[i].cprlat, cprRelativeTests[i].cprlon,
cprRelativeTests[i].fflag, cprRelativeTests[i].surface,
res, cprRelativeTests[i].result,
rlat, cprRelativeTests[i].rlat,
rlon, cprRelativeTests[i].rlon);
} else {
fprintf(stderr, "testCPRRelative[%d]: PASS\n", i);
}
}
return ok;
}
//
//=========================================================================
//
// Receive new messages and populate the interactive mode with more info
//
struct aircraft *interactiveReceiveData(struct modesMessage *mm) {
struct aircraft *a, *aux;
// Return if (checking crc) AND (not crcok) AND (not fixed)
if (Modes.check_crc && (mm->crcok == 0) && (mm->correctedbits == 0))
return NULL;
// Lookup our aircraft or create a new one
a = interactiveFindAircraft(mm->addr);
if (!a) { // If it's a currently unknown aircraft....
a = interactiveCreateAircraft(mm); // ., create a new record for it,
a->next = Modes.aircrafts; // .. and put it at the head of the list
Modes.aircrafts = a;
} else {
/* If it is an already known aircraft, move it on head
* so we keep aircrafts ordered by received message time.
*
* However move it on head only if at least one second elapsed
* since the aircraft that is currently on head sent a message,
* othewise with multiple aircrafts at the same time we have an
* useless shuffle of positions on the screen. */
if (0 && Modes.aircrafts != a && (time(NULL) - a->seen) >= 1) {
aux = Modes.aircrafts;
while(aux->next != a) aux = aux->next;
/* Now we are a node before the aircraft to remove. */
aux->next = aux->next->next; /* removed. */
/* Add on head */
a->next = Modes.aircrafts;
Modes.aircrafts = a;
}
}
a->signalLevel[a->messages & 7] = mm->signalLevel;// replace the 8th oldest signal strength
a->seen = time(NULL);
a->timestamp = mm->timestampMsg;
a->messages++;
// If a (new) CALLSIGN has been received, copy it to the aircraft structure
if (mm->bFlags & MODES_ACFLAGS_CALLSIGN_VALID) {
memcpy(a->flight, mm->flight, sizeof(a->flight));
}
// If a (new) ALTITUDE has been received, copy it to the aircraft structure
if (mm->bFlags & MODES_ACFLAGS_ALTITUDE_VALID) {
if ( (a->modeCcount) // if we've a modeCcount already
&& (a->altitude != mm->altitude ) ) // and Altitude has changed
// && (a->modeC != mm->modeC + 1) // and Altitude not changed by +100 feet
// && (a->modeC + 1 != mm->modeC ) ) // and Altitude not changes by -100 feet
{
a->modeCcount = 0; //....zero the hit count
a->modeACflags &= ~MODEAC_MSG_MODEC_HIT;
}
a->altitude = mm->altitude;
a->modeC = (mm->altitude + 49) / 100;
}
// If a (new) SQUAWK has been received, copy it to the aircraft structure
if (mm->bFlags & MODES_ACFLAGS_SQUAWK_VALID) {
if (a->modeA != mm->modeA) {
a->modeAcount = 0; // Squawk has changed, so zero the hit count
a->modeACflags &= ~MODEAC_MSG_MODEA_HIT;
}
a->modeA = mm->modeA;
}
// If a (new) HEADING has been received, copy it to the aircraft structure
if (mm->bFlags & MODES_ACFLAGS_HEADING_VALID) {
a->track = mm->heading;
}
// If a (new) SPEED has been received, copy it to the aircraft structure
if (mm->bFlags & MODES_ACFLAGS_SPEED_VALID) {
a->speed = mm->velocity;
}
// If a (new) Vertical Descent rate has been received, copy it to the aircraft structure
if (mm->bFlags & MODES_ACFLAGS_VERTRATE_VALID) {
a->vert_rate = mm->vert_rate;
}
// if the Aircraft has landed or taken off since the last message, clear the even/odd CPR flags
if ((mm->bFlags & MODES_ACFLAGS_AOG_VALID) && ((a->bFlags ^ mm->bFlags) & MODES_ACFLAGS_AOG)) {
a->bFlags &= ~(MODES_ACFLAGS_LLBOTH_VALID | MODES_ACFLAGS_AOG);
}
// If we've got a new cprlat or cprlon
if (mm->bFlags & MODES_ACFLAGS_LLEITHER_VALID) {
if (mm->bFlags & MODES_ACFLAGS_LLODD_VALID) {
a->odd_cprlat = mm->raw_latitude;
a->odd_cprlon = mm->raw_longitude;
a->odd_cprtime = mstime();
} else {
a->even_cprlat = mm->raw_latitude;
a->even_cprlon = mm->raw_longitude;
a->even_cprtime = mstime();
}
if (((mm->bFlags | a->bFlags) & MODES_ACFLAGS_LLEITHER_VALID) == MODES_ACFLAGS_LLBOTH_VALID) {
// If we now have both even and odd, decode the CPR
// Try relative CPR first
if (decodeCPRrelative(a, (mm->bFlags & MODES_ACFLAGS_LLODD_VALID), (mm->bFlags & MODES_ACFLAGS_AOG))) {
// If relative CPR fails then try global if the two data are less than 10 seconds apart
if (abs((int)(a->even_cprtime - a->odd_cprtime)) <= 10000) {
decodeCPR(a, (mm->bFlags & MODES_ACFLAGS_LLODD_VALID), (mm->bFlags & MODES_ACFLAGS_AOG));
}
}
//If we sucessfully decoded, back copy the results to mm so that we can print them in list output
if (a->bFlags & MODES_ACFLAGS_LATLON_VALID) {
mm->bFlags |= MODES_ACFLAGS_LATLON_VALID;
mm->fLat = a->lat;
mm->fLon = a->lon;
}
}
}
// Update the aircrafts a->bFlags to reflect the newly received mm->bFlags;
a->bFlags |= mm->bFlags;
if (mm->msgtype == 32) {
int flags = a->modeACflags;
if ((flags & (MODEAC_MSG_MODEC_HIT | MODEAC_MSG_MODEC_OLD)) == MODEAC_MSG_MODEC_OLD) {
//
// This Mode-C doesn't currently hit any known Mode-S, but it used to because MODEAC_MSG_MODEC_OLD is
// set So the aircraft it used to match has either changed altitude, or gone out of our receiver range
//
// We've now received this Mode-A/C again, so it must be a new aircraft. It could be another aircraft
// at the same Mode-C altitude, or it could be a new airctraft with a new Mods-A squawk.
//
// To avoid masking this aircraft from the interactive display, clear the MODEAC_MSG_MODES_OLD flag
// and set messages to 1;
//
a->modeACflags = flags & ~MODEAC_MSG_MODEC_OLD;
a->messages = 1;
}
}
a->fs = mm->fs;
return (a);
}