Decode DF-18
This commit is contained in:
Malcolm Robb
parent
08ffc3f541
commit
4a3113f65a
95
dump1090.c
95
dump1090.c
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@ -296,7 +296,7 @@ struct modesMessage {
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int ca; // Responder capabilities
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int iid;
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// DF 17
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// DF 17, DF 18
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int metype; // Extended squitter message type.
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int mesub; // Extended squitter message subtype.
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int heading; // Reported by aircraft, or computed from from EW and NS velocity
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@ -1653,6 +1653,18 @@ char *ca_str[8] = {
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/* 7 */ "Level 7 ???"
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};
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// DF 18 Control field table.
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char *cf_str[8] = {
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/* 0 */ "ADS-B ES/NT device with ICAO 24-bit address",
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/* 1 */ "ADS-B ES/NT device with other address",
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/* 2 */ "Fine format TIS-B",
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/* 3 */ "Coarse format TIS-B",
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/* 4 */ "TIS-B managment message",
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/* 5 */ "TIS-B relay of ADS-B message with other address",
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/* 6 */ "ADS-B rebroadcast using DF-17 message format",
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/* 7 */ "Reserved"
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};
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/* Flight status table. */
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char *fs_str[8] = {
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/* 0 */ "Normal, Airborne",
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@ -1710,7 +1722,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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mm->phase_corrected = 0;
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mm->crc = modesChecksum(msg, mm->msgbits);
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if ((mm->crc) && (Modes.fix_errors) && (mm->msgtype == 17)) {
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if ((mm->crc) && (Modes.fix_errors) && ((mm->msgtype == 17) || (mm->msgtype == 18))) {
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// if ((mm->crc) && (Modes.fix_errors) && ((mm->msgtype == 11) || (mm->msgtype == 17))) {
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//
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// Fixing single bit errors in DF-11 is a bit dodgy because we have no way to
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@ -1738,6 +1750,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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mm->crcok = (mm->crc < 80);
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mm->iid = mm->crc;
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mm->addr = (msg[1] << 16) | (msg[2] << 8) | (msg[3]);
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mm->ca = (msg[0] & 0x07); // Responder capabilities
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if (0 == mm->crc) {
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// DF 11 : if crc == 0 try to populate our ICAO addresses whitelist.
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@ -1747,12 +1760,23 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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} else if (mm->msgtype == 17) { // DF 17
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mm->crcok = (mm->crc == 0);
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mm->addr = (msg[1] << 16) | (msg[2] << 8) | (msg[3]);
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mm->ca = (msg[0] & 0x07); // Responder capabilities
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if (0 == mm->crc) {
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// DF 17 : if crc == 0 try to populate our ICAO addresses whitelist.
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addRecentlySeenICAOAddr(mm->addr);
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}
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} else if (mm->msgtype == 18) { // DF 18
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mm->crcok = (mm->crc == 0);
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mm->addr = (msg[1] << 16) | (msg[2] << 8) | (msg[3]);
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mm->ca = (msg[0] & 0x07); // Control Field
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if (0 == mm->crc) {
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// DF 18 : if crc == 0 try to populate our ICAO addresses whitelist.
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addRecentlySeenICAOAddr(mm->addr);
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}
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} else { // All other DF's
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// Compare the checksum with the whitelist of recently seen ICAO
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// addresses. If it matches one, then declare the message as valid
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@ -1770,8 +1794,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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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->msgtype == 11 || mm->msgtype == 17) {
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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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@ -1810,8 +1833,9 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
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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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// Fields for DF17, DF18_CF0, DF18_CF1, DF18_CF6 squitters
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if ( (mm->msgtype == 17)
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|| ((mm->msgtype == 18) && ((mm->ca == 0) || (mm->ca == 1) || (mm->ca == 6)) )) {
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int metype = mm->metype = msg[4] >> 3; // Extended squitter message type
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int mesub = mm->mesub = msg[4] & 7; // Extended squitter message subtype
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@ -2104,6 +2128,65 @@ void displayModesMessage(struct modesMessage *mm) {
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} else if (mm->msgtype == 18) { // DF 18
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printf("DF 18: Extended Squitter.\n");
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printf(" Control Field : %d (%s)\n", mm->ca, cf_str[mm->ca]);
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if ((mm->ca == 0) || (mm->ca == 1) || (mm->ca == 6)) {
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if (mm->ca == 1) {
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printf(" Other Address : %06x\n", mm->addr);
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} else {
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printf(" ICAO Address : %06x\n", mm->addr);
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}
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printf(" Extended Squitter Type: %d\n", mm->metype);
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printf(" Extended Squitter Sub : %d\n", mm->mesub);
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printf(" Extended Squitter Name: %s\n", getMEDescription(mm->metype, mm->mesub));
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// Decode the extended squitter message
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if (mm->metype >= 1 && mm->metype <= 4) { // Aircraft identification
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printf(" Aircraft Type : %c%d\n", ('A' + 4 - mm->metype), mm->mesub);
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printf(" Identification : %s\n", mm->flight);
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//} else if (mm->metype >= 5 && mm->metype <= 8) { // Surface position
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} else if (mm->metype >= 9 && mm->metype <= 18) { // Airborne position Baro
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printf(" F flag : %s\n", (mm->msg[6] & 0x04) ? "odd" : "even");
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printf(" T flag : %s\n", (mm->msg[6] & 0x08) ? "UTC" : "non-UTC");
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printf(" Altitude : %d feet\n", mm->altitude);
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if (mm->bFlags & MODES_ACFLAGS_LATLON_VALID) {
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printf(" Latitude : %f\n", mm->fLat);
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printf(" Longitude: %f\n", mm->fLon);
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} else {
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printf(" Latitude : %d (not decoded)\n", mm->raw_latitude);
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printf(" Longitude: %d (not decoded)\n", mm->raw_longitude);
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}
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} else if (mm->metype == 19) { // Airborne Velocity
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if (mm->mesub == 1 || mm->mesub == 2) {
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printf(" EW status : %s\n", (mm->bFlags & MODES_ACFLAGS_EWSPEED_VALID) ? "Valid" : "Unavailable");
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printf(" EW velocity : %d\n", mm->ew_velocity);
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printf(" NS status : %s\n", (mm->bFlags & MODES_ACFLAGS_NSSPEED_VALID) ? "Valid" : "Unavailable");
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printf(" NS velocity : %d\n", mm->ns_velocity);
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printf(" Vertical status : %s\n", (mm->bFlags & MODES_ACFLAGS_VERTRATE_VALID) ? "Valid" : "Unavailable");
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printf(" Vertical rate src : %d\n", ((mm->msg[8] >> 4) & 1));
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printf(" Vertical rate : %d\n", mm->vert_rate);
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} else if (mm->mesub == 3 || mm->mesub == 4) {
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printf(" Heading status : %s\n", (mm->bFlags & MODES_ACFLAGS_HEADING_VALID) ? "Valid" : "Unavailable");
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printf(" Heading : %d\n", mm->heading);
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printf(" Airspeed status : %s\n", (mm->bFlags & MODES_ACFLAGS_SPEED_VALID) ? "Valid" : "Unavailable");
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printf(" Airspeed : %d\n", mm->velocity);
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printf(" Vertical status : %s\n", (mm->bFlags & MODES_ACFLAGS_VERTRATE_VALID) ? "Valid" : "Unavailable");
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printf(" Vertical rate src : %d\n", ((mm->msg[8] >> 4) & 1));
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printf(" Vertical rate : %d\n", mm->vert_rate);
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} else {
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printf(" Unrecognized ME subtype: %d subtype: %d\n", mm->metype, mm->mesub);
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}
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//} else if (mm->metype >= 20 && mm->metype <= 22) { // Airborne position GNSS
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} else {
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printf(" Unrecognized ME type: %d subtype: %d\n", mm->metype, mm->mesub);
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}
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}
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} else if (mm->msgtype == 19) { // DF 19
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printf("DF 19: Military Extended Squitter.\n");
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