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More tweaking to A/C tracking.

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This commit is contained in:
Oliver Jowett 2016-10-11 21:29:39 +01:00
parent f6b1b94c7d
commit 4cb17c194c
3 changed files with 46 additions and 15 deletions
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52
track.c
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@ -55,6 +55,7 @@
uint32_t modeAC_count[4096];
uint32_t modeAC_lastcount[4096];
uint32_t modeAC_match[4096];
uint32_t modeAC_age[4096];
//
// Return a new aircraft structure for the linked list of tracked
@ -661,33 +662,62 @@ static void trackMatchAC(uint64_t now)
// match on Mode A
if (trackDataValid(&a->squawk_valid)) {
unsigned i = modeAToIndex(a->squawk);
if ((modeAC_count[i] - modeAC_lastcount[i]) > TRACK_MODEAC_MIN_MESSAGES) {
if ((modeAC_count[i] - modeAC_lastcount[i]) >= TRACK_MODEAC_MIN_MESSAGES) {
a->modeA_hit = 1;
modeAC_match[i] = (modeAC_match[i] ? 0xFFFFFFFF : a->addr);
}
}
// match on Mode C
// match on Mode C (+/- 100ft)
if (trackDataValid(&a->altitude_valid)) {
int modeC = (a->altitude + 49) / 100;
unsigned modeA = modeCToModeA(modeC);
if (modeA) {
unsigned i = modeAToIndex(modeA);
if ((modeAC_count[i] - modeAC_lastcount[i]) > TRACK_MODEAC_MIN_MESSAGES) {
a->modeC_hit = 1;
modeAC_match[i] = (modeAC_match[i] ? 0xFFFFFFFF : a->addr);
}
unsigned i = modeAToIndex(modeA);
if (modeA && (modeAC_count[i] - modeAC_lastcount[i]) >= TRACK_MODEAC_MIN_MESSAGES) {
a->modeC_hit = 1;
modeAC_match[i] = (modeAC_match[i] ? 0xFFFFFFFF : a->addr);
}
modeA = modeCToModeA(modeC + 1);
i = modeAToIndex(modeA);
if (modeA && (modeAC_count[i] - modeAC_lastcount[i]) >= TRACK_MODEAC_MIN_MESSAGES) {
a->modeC_hit = 1;
modeAC_match[i] = (modeAC_match[i] ? 0xFFFFFFFF : a->addr);
}
modeA = modeCToModeA(modeC - 1);
i = modeAToIndex(modeA);
if (modeA && (modeAC_count[i] - modeAC_lastcount[i]) >= TRACK_MODEAC_MIN_MESSAGES) {
a->modeC_hit = 1;
modeAC_match[i] = (modeAC_match[i] ? 0xFFFFFFFF : a->addr);
}
}
}
// reset counts for next time
for (unsigned i = 0; i < 4096; ++i) {
if ((modeAC_count[i] - modeAC_lastcount[i]) <= TRACK_MODEAC_MIN_MESSAGES) {
modeAC_lastcount[i] = modeAC_count[i] = 0;
if (!modeAC_count[i])
continue;
if ((modeAC_count[i] - modeAC_lastcount[i]) < TRACK_MODEAC_MIN_MESSAGES) {
if (++modeAC_age[i] > 15) {
// not heard from for a while, clear it out
modeAC_lastcount[i] = modeAC_count[i] = modeAC_age[i] = 0;
}
} else {
modeAC_lastcount[i] = modeAC_count[i];
// this one is live
// set a high initial age for matches, so they age out rapidly
// and don't show up on the interactive display when the matching
// mode S data goes away or changes
if (modeAC_match[i]) {
modeAC_age[i] = 10;
} else {
modeAC_age[i] = 0;
}
}
modeAC_lastcount[i] = modeAC_count[i];
}
}