Implement additional Decoding and Tidy
Implement additional bFlags to validate AircraftOnGround, and FS. Decode Aircraft On Ground from DF0, DF4, DF5, DF16, DF20, and DF21 where possible. Flag FS as valid for DF4, DF5, DF20, DF21, Remove dr and um from the mm structure. They're only used in console list output mode, so decode them there if required.
This commit is contained in:
Malcolm Robb
parent
60aa63b421
commit
7df6d656a0
69
dump1090.c
69
dump1090.c
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@ -56,7 +56,7 @@
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// MinorVer changes when additional features are added, but not for bug fixes (range 00-99)
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// DayDate & Year changes for all changes, including for bug fixes. It represent the release date of the update
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//
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#define MODES_DUMP1090_VERSION "1.04.0905.13"
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#define MODES_DUMP1090_VERSION "1.05.1005.13"
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#define MODES_USER_LATITUDE_DFLT (0.0)
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#define MODES_USER_LONGITUDE_DFLT (0.0)
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@ -117,10 +117,14 @@
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#define MODES_ACFLAGS_AOG (1<<9) // Aircraft is On the Ground
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#define MODES_ACFLAGS_LLEVEN_VALID (1<<10) // Aircraft Even Lot/Lon is known
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#define MODES_ACFLAGS_LLODD_VALID (1<<11) // Aircraft Odd Lot/Lon is known
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#define MODES_ACFLAGS_AOG_VALID (1<<12) // MODES_ACFLAGS_AOG is valid
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#define MODES_ACFLAGS_FS_VALID (1<<13) // Aircraft Flight Status is known
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#define MODES_ACFLAGS_NSEWSPD_VALID (1<<14) // Aircraft EW and NS Speed is known
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#define MODES_ACFLAGS_LATLON_REL_OK (1<<15) // Indicates it's OK to do a relative CPR
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#define MODES_ACFLAGS_LLEITHER_VALID (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
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#define MODES_ACFLAGS_LLBOTH_VALID (MODES_ACFLAGS_LLEVEN_VALID | MODES_ACFLAGS_LLODD_VALID)
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#define MODES_ACFLAGS_AOG_GROUND (MODES_ACFLAGS_AOG_VALID | MODES_ACFLAGS_AOG)
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#define MODES_SBS_LAT_LONG_FRESH (1<<0)
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@ -311,8 +315,6 @@ struct modesMessage {
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// DF4, DF5, DF20, DF21
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int fs; // Flight status for DF4,5,20,21
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int dr; // Request extraction of downlink request.
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int um; // Request extraction of downlink request.
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int modeA; // 13 bits identity (Squawk).
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// Fields used by multiple message types.
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@ -1465,11 +1467,24 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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mm->crcok = ICAOAddressWasRecentlySeen(mm->crc);
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}
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// Fields for DF4,5,20,21
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mm->ca = // Responder capabilities
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mm->fs = msg[0] & 7; // Flight status for DF4,5,20,21
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mm->dr = (msg[1] >> 3) & 0x1F; // Request extraction of downlink request
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mm->um = ((msg[1] & 7) << 3) | (msg[2] >> 5); // Request extraction of downlink request
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// Fields for DF0, DF16
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if (mm->msgtype == 0 || mm->msgtype == 16) {
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if (msg[0] & 0x04) { // VS Bit
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID | MODES_ACFLAGS_AOG;
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} else {
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID;
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}
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}
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// Fields for DF11, DF17
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if (mm->msgtype == 11 || mm->msgtype == 17) {
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mm->ca = msg[0] & 0x07; // Responder capabilities
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if (mm->ca == 4) {
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID | MODES_ACFLAGS_AOG;
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} else if (mm->ca == 5) {
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID;
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}
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}
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// Fields for DF5, DF21 = Gillham encoded Squawk
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if (mm->msgtype == 5 || mm->msgtype == 21) {
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@ -1490,6 +1505,18 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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}
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}
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// Fields for DF4, DF5, DF20, DF21
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if ((mm->msgtype == 4) || (mm->msgtype == 20) ||
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(mm->msgtype == 5) || (mm->msgtype == 21)) {
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mm->bFlags |= MODES_ACFLAGS_FS_VALID;
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mm->fs = msg[0] & 7; // Flight status for DF4,5,20,21
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if (mm->fs <= 3) {
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID;
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if (mm->fs & 1)
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{mm->bFlags |= MODES_ACFLAGS_AOG;}
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}
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}
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// Fields for DF17 squitter
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if (mm->msgtype == 17) {
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int metype = mm->metype = msg[4] >> 3; // Extended squitter message type
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@ -1522,13 +1549,14 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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: MODES_ACFLAGS_LLEVEN_VALID;
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if (metype >= 9) { // Airborne
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int AC12Field = ((msg[5] << 4) | (msg[6] >> 4)) & 0x0FFF;
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID;
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if (AC12Field) {// Only attempt to decode if a valid (non zero) altitude is present
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mm->bFlags |= MODES_ACFLAGS_ALTITUDE_VALID;
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mm->altitude = decodeAC12Field(AC12Field, &mm->unit);
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}
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} else { // Ground
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int movement = ((msg[4] << 4) | (msg[5] >> 4)) & 0x007F;
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mm->bFlags |= MODES_ACFLAGS_AOG;
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mm->bFlags |= MODES_ACFLAGS_AOG_VALID | MODES_ACFLAGS_AOG;
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if ((movement) && (movement < 125)) {
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mm->bFlags |= MODES_ACFLAGS_SPEED_VALID;
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mm->velocity = decodeMovementField(movement);
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@ -1580,7 +1608,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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if (ew_raw && ns_raw) {
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// Compute velocity and angle from the two speed components
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mm->bFlags |= (MODES_ACFLAGS_SPEED_VALID | MODES_ACFLAGS_HEADING_VALID);
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mm->bFlags |= (MODES_ACFLAGS_SPEED_VALID | MODES_ACFLAGS_HEADING_VALID | MODES_ACFLAGS_NSEWSPD_VALID);
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mm->velocity = (int) sqrt((ns_vel * ns_vel) + (ew_vel * ew_vel));
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if (mm->velocity) {
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@ -1643,7 +1671,7 @@ void displayModesMessage(struct modesMessage *mm) {
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// Handle only addresses mode first.
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if (Modes.onlyaddr) {
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printf("%06x\n", mm->addr);
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return;
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return; // Enough for --onlyaddr mode
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}
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// Show the raw message.
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@ -1660,8 +1688,8 @@ void displayModesMessage(struct modesMessage *mm) {
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printf(";\n");
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if (Modes.raw) {
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fflush(stdout); /* Provide data to the reader ASAP. */
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return; /* Enough for --raw mode */
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fflush(stdout); // Provide data to the reader ASAP
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return; // Enough for --raw mode
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}
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if (mm->msgtype < 32)
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@ -1680,8 +1708,8 @@ void displayModesMessage(struct modesMessage *mm) {
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printf("DF %d: %s, Altitude Reply.\n", mm->msgtype,
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(mm->msgtype == 4) ? "Surveillance" : "Comm-B");
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printf(" Flight Status : %s\n", fs_str[mm->fs]);
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printf(" DR : %d\n", mm->dr);
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printf(" UM : %d\n", mm->um);
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printf(" DR : %d\n", ((mm->msg[1] >> 3) & 0x1F));
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printf(" UM : %d\n", (((mm->msg[1] & 7) << 3) | (mm->msg[2] >> 5)));
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printf(" Altitude : %d %s\n", mm->altitude,
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(mm->unit == MODES_UNIT_METERS) ? "meters" : "feet");
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printf(" ICAO Address : %06x\n", mm->addr);
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@ -1699,8 +1727,8 @@ void displayModesMessage(struct modesMessage *mm) {
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printf("DF %d: %s, Identity Reply.\n", mm->msgtype,
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(mm->msgtype == 5) ? "Surveillance" : "Comm-B");
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printf(" Flight Status : %s\n", fs_str[mm->fs]);
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printf(" DR : %d\n", mm->dr);
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printf(" UM : %d\n", mm->um);
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printf(" DR : %d\n", ((mm->msg[1] >> 3) & 0x1F));
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printf(" UM : %d\n", (((mm->msg[1] & 7) << 3) | (mm->msg[2] >> 5)));
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printf(" Squawk : %x\n", mm->modeA);
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printf(" ICAO Address : %06x\n", mm->addr);
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@ -1715,7 +1743,7 @@ void displayModesMessage(struct modesMessage *mm) {
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} else if (mm->msgtype == 11) { // DF 11
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printf("DF 11: All Call Reply.\n");
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printf(" Capability : %s\n", ca_str[mm->ca]);
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printf(" Capability : %d (%s)\n", mm->ca, ca_str[mm->ca]);
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printf(" ICAO Address: %06x\n", mm->addr);
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if (mm->iid > 16)
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{printf(" IID : SI-%02d\n", mm->iid-16);}
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@ -1806,6 +1834,8 @@ void displayModesMessage(struct modesMessage *mm) {
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} else {
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printf("DF %d: Unknown DF Format.\n", mm->msgtype);
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}
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printf("\n");
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}
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/* Turn I/Q samples pointed by Modes.data into the magnitude vector
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@ -2229,7 +2259,6 @@ void useModesMessage(struct modesMessage *mm) {
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// standard output as they occur.
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if (!Modes.interactive && !Modes.quiet) {
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displayModesMessage(mm);
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if (!Modes.raw && !Modes.onlyaddr) printf("\n");
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}
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// Send data to connected network clients
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@ -2653,7 +2682,7 @@ struct aircraft *interactiveReceiveData(struct modesMessage *mm) {
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}
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// if the Aircraft has landed or taken off since the last message, clear the even/odd CPR flags
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if ((a->bFlags ^ mm->bFlags) & MODES_ACFLAGS_AOG) {
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if ((mm->bFlags & MODES_ACFLAGS_AOG_VALID) && ((a->bFlags ^ mm->bFlags) & MODES_ACFLAGS_AOG)) {
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a->bFlags &= ~(MODES_ACFLAGS_LLBOTH_VALID | MODES_ACFLAGS_AOG);
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} else if ( (mm->bFlags & MODES_ACFLAGS_LLEITHER_VALID)
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