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Use the right inter-CPR max interval for surface position messages. Fixes #18.

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This commit is contained in:
Oliver Jowett 2015-02-09 14:17:31 +00:00
parent 9fd0c822f6
commit f19eee898b
1 changed files with 14 additions and 1 deletions
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15
track.c
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@ -235,6 +235,19 @@ static int doLocalCPR(struct aircraft *a, int fflag, int surface, time_t now)
static void updatePosition(struct aircraft *a, struct modesMessage *mm, time_t now)
{
int location_result = -1;
int max_elapsed;
if (mm->bFlags & MODES_ACFLAGS_AOG) {
// Surface: 25 seconds if >25kt or speed unknown, 50 seconds otherwise
if ((mm->bFlags & MODES_ACFLAGS_SPEED_VALID) && mm->velocity <= 25)
max_elapsed = 50000;
else
max_elapsed = 25000;
} else {
// Airborne: 10 seconds
max_elapsed = 10000;
}
if (mm->bFlags & MODES_ACFLAGS_LLODD_VALID) {
a->odd_cprlat = mm->raw_latitude;
@ -247,7 +260,7 @@ static void updatePosition(struct aircraft *a, struct modesMessage *mm, time_t n
}
// If we have enough recent data, try global CPR
if (((mm->bFlags | a->bFlags) & MODES_ACFLAGS_LLEITHER_VALID) == MODES_ACFLAGS_LLBOTH_VALID && abs((int)(a->even_cprtime - a->odd_cprtime)) <= 10000) {
if (((mm->bFlags | a->bFlags) & MODES_ACFLAGS_LLEITHER_VALID) == MODES_ACFLAGS_LLBOTH_VALID && abs((int)(a->even_cprtime - a->odd_cprtime)) <= max_elapsed) {
location_result = doGlobalCPR(a, (mm->bFlags & MODES_ACFLAGS_LLODD_VALID), (mm->bFlags & MODES_ACFLAGS_AOG));
if (location_result == -2) {
// Global CPR failed because an airborne position produced implausible results.