[hamradio-commits] [dump1090] 197/389: Decode DF-18
Matthew Ernisse
mernisse-guest at moszumanska.debian.org
Wed Nov 5 00:19:55 UTC 2014
This is an automated email from the git hooks/post-receive script.
mernisse-guest pushed a commit to branch master
in repository dump1090.
commit 4a3113f65aa3baa0e5315443138f69f23d75c116
Author: Malcolm Robb <Support at ATTAvionics.com>
Date: Wed May 22 00:05:03 2013 +0100
Decode DF-18
---
dump1090.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 89 insertions(+), 6 deletions(-)
diff --git a/dump1090.c b/dump1090.c
index 5b98438..fec1f37 100644
--- a/dump1090.c
+++ b/dump1090.c
@@ -296,7 +296,7 @@ struct modesMessage {
int ca; // Responder capabilities
int iid;
- // DF 17
+ // DF 17, DF 18
int metype; // Extended squitter message type.
int mesub; // Extended squitter message subtype.
int heading; // Reported by aircraft, or computed from from EW and NS velocity
@@ -1653,6 +1653,18 @@ char *ca_str[8] = {
/* 7 */ "Level 7 ???"
};
+// DF 18 Control field table.
+char *cf_str[8] = {
+ /* 0 */ "ADS-B ES/NT device with ICAO 24-bit address",
+ /* 1 */ "ADS-B ES/NT device with other address",
+ /* 2 */ "Fine format TIS-B",
+ /* 3 */ "Coarse format TIS-B",
+ /* 4 */ "TIS-B managment message",
+ /* 5 */ "TIS-B relay of ADS-B message with other address",
+ /* 6 */ "ADS-B rebroadcast using DF-17 message format",
+ /* 7 */ "Reserved"
+};
+
/* Flight status table. */
char *fs_str[8] = {
/* 0 */ "Normal, Airborne",
@@ -1710,7 +1722,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
mm->phase_corrected = 0;
mm->crc = modesChecksum(msg, mm->msgbits);
- if ((mm->crc) && (Modes.fix_errors) && (mm->msgtype == 17)) {
+ if ((mm->crc) && (Modes.fix_errors) && ((mm->msgtype == 17) || (mm->msgtype == 18))) {
// if ((mm->crc) && (Modes.fix_errors) && ((mm->msgtype == 11) || (mm->msgtype == 17))) {
//
// Fixing single bit errors in DF-11 is a bit dodgy because we have no way to
@@ -1738,6 +1750,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
mm->crcok = (mm->crc < 80);
mm->iid = mm->crc;
mm->addr = (msg[1] << 16) | (msg[2] << 8) | (msg[3]);
+ mm->ca = (msg[0] & 0x07); // Responder capabilities
if (0 == mm->crc) {
// DF 11 : if crc == 0 try to populate our ICAO addresses whitelist.
@@ -1747,12 +1760,23 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
} else if (mm->msgtype == 17) { // DF 17
mm->crcok = (mm->crc == 0);
mm->addr = (msg[1] << 16) | (msg[2] << 8) | (msg[3]);
+ mm->ca = (msg[0] & 0x07); // Responder capabilities
if (0 == mm->crc) {
// DF 17 : if crc == 0 try to populate our ICAO addresses whitelist.
addRecentlySeenICAOAddr(mm->addr);
}
+ } else if (mm->msgtype == 18) { // DF 18
+ mm->crcok = (mm->crc == 0);
+ mm->addr = (msg[1] << 16) | (msg[2] << 8) | (msg[3]);
+ mm->ca = (msg[0] & 0x07); // Control Field
+
+ if (0 == mm->crc) {
+ // DF 18 : if crc == 0 try to populate our ICAO addresses whitelist.
+ addRecentlySeenICAOAddr(mm->addr);
+ }
+
} else { // All other DF's
// Compare the checksum with the whitelist of recently seen ICAO
// addresses. If it matches one, then declare the message as valid
@@ -1770,8 +1794,7 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
}
// Fields for DF11, DF17
- if (mm->msgtype == 11 || mm->msgtype == 17) {
- mm->ca = msg[0] & 0x07; // Responder capabilities
+ if (mm->msgtype == 11 || mm->msgtype == 17) {
if (mm->ca == 4) {
mm->bFlags |= MODES_ACFLAGS_AOG_VALID | MODES_ACFLAGS_AOG;
} else if (mm->ca == 5) {
@@ -1810,8 +1833,9 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
}
}
- // Fields for DF17 squitter
- if (mm->msgtype == 17) {
+ // Fields for DF17, DF18_CF0, DF18_CF1, DF18_CF6 squitters
+ if ( (mm->msgtype == 17)
+ || ((mm->msgtype == 18) && ((mm->ca == 0) || (mm->ca == 1) || (mm->ca == 6)) )) {
int metype = mm->metype = msg[4] >> 3; // Extended squitter message type
int mesub = mm->mesub = msg[4] & 7; // Extended squitter message subtype
@@ -2104,6 +2128,65 @@ void displayModesMessage(struct modesMessage *mm) {
} else if (mm->msgtype == 18) { // DF 18
printf("DF 18: Extended Squitter.\n");
+ printf(" Control Field : %d (%s)\n", mm->ca, cf_str[mm->ca]);
+ if ((mm->ca == 0) || (mm->ca == 1) || (mm->ca == 6)) {
+ if (mm->ca == 1) {
+ printf(" Other Address : %06x\n", mm->addr);
+ } else {
+ printf(" ICAO Address : %06x\n", mm->addr);
+ }
+ printf(" Extended Squitter Type: %d\n", mm->metype);
+ printf(" Extended Squitter Sub : %d\n", mm->mesub);
+ printf(" Extended Squitter Name: %s\n", getMEDescription(mm->metype, mm->mesub));
+
+ // Decode the extended squitter message
+ if (mm->metype >= 1 && mm->metype <= 4) { // Aircraft identification
+ printf(" Aircraft Type : %c%d\n", ('A' + 4 - mm->metype), mm->mesub);
+ printf(" Identification : %s\n", mm->flight);
+
+ //} else if (mm->metype >= 5 && mm->metype <= 8) { // Surface position
+
+ } else if (mm->metype >= 9 && mm->metype <= 18) { // Airborne position Baro
+ printf(" F flag : %s\n", (mm->msg[6] & 0x04) ? "odd" : "even");
+ printf(" T flag : %s\n", (mm->msg[6] & 0x08) ? "UTC" : "non-UTC");
+ printf(" Altitude : %d feet\n", mm->altitude);
+ if (mm->bFlags & MODES_ACFLAGS_LATLON_VALID) {
+ printf(" Latitude : %f\n", mm->fLat);
+ printf(" Longitude: %f\n", mm->fLon);
+ } else {
+ printf(" Latitude : %d (not decoded)\n", mm->raw_latitude);
+ printf(" Longitude: %d (not decoded)\n", mm->raw_longitude);
+ }
+
+ } else if (mm->metype == 19) { // Airborne Velocity
+ if (mm->mesub == 1 || mm->mesub == 2) {
+ printf(" EW status : %s\n", (mm->bFlags & MODES_ACFLAGS_EWSPEED_VALID) ? "Valid" : "Unavailable");
+ printf(" EW velocity : %d\n", mm->ew_velocity);
+ printf(" NS status : %s\n", (mm->bFlags & MODES_ACFLAGS_NSSPEED_VALID) ? "Valid" : "Unavailable");
+ printf(" NS velocity : %d\n", mm->ns_velocity);
+ printf(" Vertical status : %s\n", (mm->bFlags & MODES_ACFLAGS_VERTRATE_VALID) ? "Valid" : "Unavailable");
+ printf(" Vertical rate src : %d\n", ((mm->msg[8] >> 4) & 1));
+ printf(" Vertical rate : %d\n", mm->vert_rate);
+
+ } else if (mm->mesub == 3 || mm->mesub == 4) {
+ printf(" Heading status : %s\n", (mm->bFlags & MODES_ACFLAGS_HEADING_VALID) ? "Valid" : "Unavailable");
+ printf(" Heading : %d\n", mm->heading);
+ printf(" Airspeed status : %s\n", (mm->bFlags & MODES_ACFLAGS_SPEED_VALID) ? "Valid" : "Unavailable");
+ printf(" Airspeed : %d\n", mm->velocity);
+ printf(" Vertical status : %s\n", (mm->bFlags & MODES_ACFLAGS_VERTRATE_VALID) ? "Valid" : "Unavailable");
+ printf(" Vertical rate src : %d\n", ((mm->msg[8] >> 4) & 1));
+ printf(" Vertical rate : %d\n", mm->vert_rate);
+
+ } else {
+ printf(" Unrecognized ME subtype: %d subtype: %d\n", mm->metype, mm->mesub);
+ }
+
+ //} else if (mm->metype >= 20 && mm->metype <= 22) { // Airborne position GNSS
+
+ } else {
+ printf(" Unrecognized ME type: %d subtype: %d\n", mm->metype, mm->mesub);
+ }
+ }
} else if (mm->msgtype == 19) { // DF 19
printf("DF 19: Military Extended Squitter.\n");
--
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