Backups/dump1090
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speed while on the ground should also be kt.

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Skip Tavakkolian 2013-06-07 06:45:43 -07:00 committed by antirez
parent eea517e956
commit b2cd4f6d00
1 changed files with 23 additions and 27 deletions
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dump1090.c
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@ -1065,39 +1065,37 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
mm->flight[8] = '\0';
} else if (mm->metype >= 5 && mm->metype <= 8) {
/* Surface Position Message */
int mvt = ((msg[0] & 7) << 4) | (msg[1] >> 4) ;
if (mvt == 0) {
mm->velocity = 0; /* unknown */
} else if (mvt == 1) {
/* less than 0.125 kt */
mm->velocity = 0.125 * 1.6878099 / 2; /* kt to f/s */
int mvt = ((msg[0] & 7) << 4) | (msg[1] >> 4);
if (mvt == 0) { /* unknown */
mm->velocity = 0;
} else if (mvt == 1) { /* less than 0.125 kt */
mm->velocity = 0.124;
} else if (mvt == 124) {
mm->velocity = 175 * 1.6878099;
mm->velocity = 175;
} else if (mvt >= 2 && mvt <= 8) {
mm->velocity = 0.125 * 1.6878099;
mm->velocity += (mvt-2) * 0.125 * 1.6878099;
mm->velocity = 0.125;
mm->velocity += (mvt-2) * 0.125;
} else if (mvt >= 9 && mvt <= 12) {
mm->velocity = 1.6878099;
mm->velocity += (mvt-9) * 0.25 * 1.6878099;
mm->velocity = 1;
mm->velocity += (mvt-9) * 0.25;
} else if (mvt >= 13 && mvt <= 38) {
mm->velocity = 2 * 1.6878099;
mm->velocity += (mvt-13) * 0.5 * 1.6878099;
mm->velocity = 2;
mm->velocity += (mvt-13) * 0.5;
} else if (mvt >= 39 && mvt <= 93) {
mm->velocity = 15 * 1.6878099;
mm->velocity += (mvt-39) * 1.0 * 1.6878099;
mm->velocity = 15;
mm->velocity += (mvt-39) * 1.0;
} else if (mvt >= 94 && mvt <= 108) {
mm->velocity = 70 * 1.6878099;
mm->velocity += (mvt-94) * 2.0 * 1.6878099;
mm->velocity = 70;
mm->velocity += (mvt-94) * 2.0;
} else if (mvt >= 109 && mvt <= 123) {
mm->velocity = 100 * 1.6878099;
mm->velocity += (mvt-109) * 5.0 * 1.6878099;
mm->velocity = 100;
mm->velocity += (mvt-109) * 5.0;
}
mm->heading_is_valid = msg[1] & (1<<3);
if(mm->heading_is_valid){
int track = ((msg[1] & 7) << 4)|
(msg[2] >> 4);
mm->heading = track * 360 / 128; /* 360/128 degrees increments */
}
int track = ((msg[1] & 7) << 4) | (msg[2] >> 4);
mm->heading = track * 360 / 128; /* 360/128 degrees increments */
mm->fflag = msg[6] & (1<<2);
mm->tflag = msg[6] & (1<<3);
mm->raw_latitude = ((msg[6] & 3) << 15) |
@ -1862,9 +1860,7 @@ struct aircraft *interactiveReceiveData(struct modesMessage *mm) {
memcpy(a->flight, mm->flight, sizeof(a->flight));
} else if (mm->metype >= 5 && mm->metype <= 8) {
a->speed = mm->velocity;
if(mm->heading_is_valid){
a->track = mm->heading;
}
a->track = mm->heading;
if (mm->fflag) {
a->odd_cprlat = mm->raw_latitude;
a->odd_cprlon = mm->raw_longitude;