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package de.serosystems.example;
/*
* This file is part of de.serosystems.lib1090.
*
* de.serosystems.lib1090 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* de.serosystems.lib1090 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with de.serosystems.lib1090. If not, see .
*/
import de.serosystems.lib1090.Position;
import de.serosystems.lib1090.StatefulModeSDecoder;
import de.serosystems.lib1090.Tools;
import de.serosystems.lib1090.exceptions.BadFormatException;
import de.serosystems.lib1090.exceptions.UnspecifiedFormatError;
import de.serosystems.lib1090.msgs.ModeSDownlinkMsg;
import de.serosystems.lib1090.msgs.adsb.*;
import de.serosystems.lib1090.msgs.modes.*;
import java.util.Scanner;
/**
* ADS-B decoder example: It reads STDIN line-by-line. It should be fed with
* comma-separated timestamp, receiver latitude, receiver longitude and the
* raw Mode S/ADS-B message. Receiver coordinates can be omitted. In that
* case, surface position messages cannot be decoded properly and plausibility
* checks for positions are limited.
*
* Example input:
*
* 1,8d4b19f39911088090641010b9b0
* 2,8d4ca513587153a8184a2fb5adeb
* 3,8d3413c399014e23c80f947ce87c
* 4,5d4ca88c079afe
* 5,a0001838ca3e51f0a8000047a36a
* 6,8d47a36a58c38668ffb55f000000
* 7,5d506c28000000
* 8,a8000102fe81c1000000004401e3
* 9,a0001839000000000000004401e3
*
* @author Matthias Schäfer ([email protected])
* @author Markus Fuchs ([email protected])
*/
public class ExampleDecoder {
// The ModeSDecoder does all the magic for us
private final StatefulModeSDecoder decoder = new StatefulModeSDecoder();
/**
*
* @param timestamp in milliseconds since epoch
* @param raw Mode S messages as hex string
* @param receiver the location of the receiver for sanity checks on decoded positions (optional)
*/
public void decodeMsg(long timestamp, String raw, Position receiver) {
ModeSDownlinkMsg msg;
try {
msg = decoder.decode(raw, timestamp);
} catch (BadFormatException e) {
System.out.println("Malformed message! Skipping it. Message: "+e.getMessage());
return;
} catch (UnspecifiedFormatError e) {
System.out.println("Unspecified message! Skipping it...");
return;
}
String icao24 = msg.getAddress().getHexAddress();
// check for erroneous messages; some receivers set
// parity field to the result of the CRC polynomial division
if (msg.getParity() == 0 || msg.checkParity()) { // CRC is ok
// now check the message type
switch (msg.getType()) {
case ADSB_AIRBORN_POSITION_V0:
case ADSB_AIRBORN_POSITION_V1:
case ADSB_AIRBORN_POSITION_V2:
AirbornePositionV0Msg ap0 = (AirbornePositionV0Msg) msg;
System.out.print("["+icao24+"]: ");
// use CPR to decode position
// CPR needs at least 2 positions or a reference, otherwise we get null here
Position c0 = decoder.extractPosition(ap0.getAddress(), ap0, receiver);
if (c0 == null)
System.out.println("Cannot decode position yet.");
else
System.out.println("Now at position (" + c0.getLatitude() + "," + c0.getLongitude() + ")");
System.out.println(" Horizontal containment radius limit/protection level: " +
ap0.getHorizontalContainmentRadiusLimit() + " m");
if (ap0.hasValidAltitude()) {
System.out.println(" Altitude: " + ap0.getAltitude() + " ft");
System.out.println(" Altitude Reference System: " + ap0.getAltitudeType());
}
Integer geoMinusBaro = decoder.getGeoMinusBaro(msg);
if (ap0.hasValidAltitude() && ap0.getAltitudeType() == Position.AltitudeType.BAROMETRIC_ALTITUDE && geoMinusBaro != null) {
System.out.println(" Height (geom.): " + ap0.getAltitude() + geoMinusBaro + " ft");
}
System.out.println(" Navigation Integrity Category: " + ap0.getNIC());
System.out.println(" Surveillance status: " + ap0.getSurveillanceStatusDescription());
// we want to inspect fields for ADS-B of different versions
switch(msg.getType()) {
case ADSB_AIRBORN_POSITION_V0:
// NACp and SIL for newer ADS-B versions contained in operational status message
System.out.println(" Navigation Accuracy Category for position (NACp): " + ap0.getNACp());
System.out.println(" Position Uncertainty (based on NACp): " + ap0.getPositionUncertainty());
System.out.println(" Surveillance Integrity Level (SIL): " + ap0.getSIL());
break;
case ADSB_AIRBORN_POSITION_V1:
AirbornePositionV1Msg ap1 = (AirbornePositionV1Msg) msg;
System.out.println(" NIC supplement A set: " + ap1.hasNICSupplementA());
break;
case ADSB_AIRBORN_POSITION_V2:
AirbornePositionV2Msg ap2 = (AirbornePositionV2Msg) msg;
// NIC supplement A contained in operational status messages is set by the decoder if present
System.out.println(" NIC supplement A set: " + ap2.hasNICSupplementA());
System.out.println(" NIC supplement B set: " + ap2.hasNICSupplementB());
break;
}
break;
case ADSB_SURFACE_POSITION_V0:
case ADSB_SURFACE_POSITION_V1:
case ADSB_SURFACE_POSITION_V2:
SurfacePositionV0Msg sp0 = (SurfacePositionV0Msg) msg;
System.out.print("["+icao24+"]: ");
Position sPos0 = decoder.extractPosition(sp0.getAddress(), sp0, receiver);
// decode the position if possible; prior position needed
if (sPos0 == null)
System.out.println("Cannot decode position yet or no reference available (yet).");
else
System.out.println("Now at position (" + sPos0.getLatitude() + "," + sPos0.getLongitude() + ")");
System.out.println(" Horizontal containment radius limit/protection level is " +
sp0.getHorizontalContainmentRadiusLimit() + "m");
if (sp0.hasValidHeading())
System.out.println(" Heading: " + sp0.getHeading() + "°");
System.out.println(" Airplane is on the ground.");
if (sp0.hasGroundSpeed()) {
System.out.println(" Ground speed: " + sp0.getGroundSpeed() + "kt");
System.out.println(" Ground speed resolution: " + sp0.getGroundSpeedResolution() + "kt");
}
// we want to inspect fields for ADS-B of different versions
switch(msg.getType()) {
case ADSB_SURFACE_POSITION_V0:
// NACp and SIL for newer ADS-B versions contained in operational status message
// Use the following only with version 0 as the others are more accurate
System.out.println(" Navigation Accuracy Category for position (NACp): " + sp0.getNACp());
System.out.println(" Position Uncertainty (based on NACp): " + sp0.getPositionUncertainty() + "m");
System.out.println(" Surveillance Integrity Level (SIL): " + sp0.getSIL());
break;
case ADSB_SURFACE_POSITION_V1:
SurfacePositionV1Msg sp1 = (SurfacePositionV1Msg) msg;
System.out.println(" NIC supplement A set: "+sp1.hasNICSupplementA());
break;
case ADSB_SURFACE_POSITION_V2:
SurfacePositionV2Msg sp2 = (SurfacePositionV2Msg) msg;
// NIC supplement C contained in operational status messages is set by the decoder if present
System.out.println(" NIC supplement A set: "+sp2.hasNICSupplementA());
System.out.println(" NIC supplement C set: "+sp2.hasNICSupplementC());
break;
}
break;
case ADSB_EMERGENCY:
EmergencyOrPriorityStatusMsg status = (EmergencyOrPriorityStatusMsg) msg;
System.out.println("["+icao24+"]: "+status.getEmergencyStateText());
System.out.println(" Mode A code is "+status.getIdentity());
break;
case ADSB_AIRSPEED:
AirspeedHeadingMsg airspeed = (AirspeedHeadingMsg) msg;
System.out.println("["+icao24+"]: Airspeed: "+
(airspeed.hasAirspeedInfo() ? airspeed.getAirspeed()+" kt" : "unkown"));
if (decoder.getAdsbVersion(msg) == 0) {
// version 0 flag indicates true or magnetic north
System.out.println(" Heading: " + airspeed.getHeading() + "° relative to " +
(airspeed.hasHeadingStatusFlag() ? "magnetic north" : "true north"));
} else {
// version 1+ flag indicates if heading is available at all
System.out.println(" Heading: "+
(airspeed.hasHeadingStatusFlag() ? airspeed.getHeading()+"°" : "unkown"));
}
if (airspeed.hasVerticalRateInfo())
System.out.println(" Vertical rate: "+
(airspeed.hasVerticalRateInfo() ? airspeed.getVerticalRate()+" ft/min" : "unkown"));
break;
case ADSB_IDENTIFICATION:
IdentificationMsg ident = (IdentificationMsg) msg;
System.out.println("["+icao24+"]: Callsign: "+new String(ident.getIdentity()));
System.out.println(" Category: "+ident.getCategoryDescription());
break;
case ADSB_STATUS_V0:
OperationalStatusV0Msg opstat0 = (OperationalStatusV0Msg) msg;
System.out.println("["+icao24+"]: Using ADS-B version "+opstat0.getVersion());
System.out.println(" Has operational TCAS: "+ opstat0.hasOperationalTCAS());
System.out.println(" Has operational CDTI: "+ opstat0.hasOperationalCDTI());
break;
case ADSB_AIRBORN_STATUS_V1:
case ADSB_AIRBORN_STATUS_V2:
AirborneOperationalStatusV1Msg opstatA1 = (AirborneOperationalStatusV1Msg) msg;
System.out.println("["+icao24+"]: Using ADS-B version "+opstatA1.getVersion());
System.out.println(" Barometric altitude cross-checked: "+opstatA1.getBarometricAltitudeIntegrityCode());
System.out.println(" Gemoetric vertical accuracy: "+opstatA1.getGeometricVerticalAccuracy()+"m");
if (opstatA1.getHorizontalReferenceDirection())
System.out.println(" Horizontal reference: true north");
else
System.out.println(" Horizontal reference: true north");
System.out.println(" Navigation Accuracy Category for position (NACp): " + opstatA1.getNACp());
System.out.println(" Position Uncertainty (based on NACp): " + opstatA1.getPositionUncertainty());
System.out.println(" Has NIC supplement A: " + opstatA1.hasNICSupplementA());
System.out.println(" Surveillance/Source Integrity Level (SIL): " + opstatA1.getSIL());
System.out.println(" System design assurance: " + opstatA1.getSystemDesignAssurance());
System.out.println(" Has 1090ES in: " + opstatA1.has1090ESIn());
System.out.println(" IDENT switch active: " + opstatA1.hasActiveIDENTSwitch());
System.out.println(" Has operational TCAS: " + opstatA1.hasOperationalTCAS());
System.out.println(" Has TCAS resolution advisory: " + opstatA1.hasTCASResolutionAdvisory());
System.out.println(" Has UAT in: " + opstatA1.hasUATIn());
System.out.println(" Uses single antenna: " + opstatA1.hasSingleAntenna());
System.out.println(" Supports air-referenced velocity reports: " + opstatA1.hasAirReferencedVelocity());
// SIL supplement in version 2
if (msg instanceof AirborneOperationalStatusV2Msg) {
System.out.println(" Has SIL supplement: " + ((AirborneOperationalStatusV2Msg) msg).hasSILSupplement());
}
break;
case ADSB_SURFACE_STATUS_V1:
case ADSB_SURFACE_STATUS_V2:
SurfaceOperationalStatusV1Msg opstatS1 = (SurfaceOperationalStatusV1Msg) msg;
System.out.println("["+icao24+"]: Using ADS-B version "+opstatS1.getVersion());
System.out.println(" Gemoetric vertical accuracy: "+opstatS1.getGeometricVerticalAccuracy()+"m");
if (opstatS1.getHorizontalReferenceDirection())
System.out.println(" Horizontal reference: true north");
else
System.out.println(" Horizontal reference: true north");
System.out.println(" Navigation Accuracy Category for position (NACp): " + opstatS1.getNACp());
System.out.println(" Position Uncertainty (based on NACp): " + opstatS1.getPositionUncertainty());
System.out.println(" Has NIC supplement A: " + opstatS1.hasNICSupplementA());
System.out.println(" Has NIC supplement C: " + opstatS1.getNICSupplementC());
System.out.println(" Surveillance/Source Integrity Level (SIL): " + opstatS1.getSIL());
System.out.println(" System design assurance: " + opstatS1.getSystemDesignAssurance());
System.out.println(" Has 1090ES in: " + opstatS1.has1090ESIn());
System.out.println(" IDENT switch active: " + opstatS1.hasActiveIDENTSwitch());
System.out.println(" Has TCAS resolution advisory: " + opstatS1.hasTCASResolutionAdvisory());
System.out.println(" Has UAT in: " + opstatS1.hasUATIn());
System.out.println(" Uses single antenna: " + opstatS1.hasSingleAntenna());
System.out.println(" Airplane length: " + opstatS1.getAirplaneLength() + "m");
System.out.println(" Airplane width: " + opstatS1.getAirplaneWidth() + "m");
System.out.println(" Navigation Accuracy Category for velocity (NACv): " + opstatS1.getNACv());
System.out.println(" Low (<70W) TX power: " + opstatS1.hasLowTxPower());
System.out.println(" Encoded GPS antenna offset: " + opstatS1.getGPSAntennaOffset());
System.out.println(" Has track heading info: " + opstatS1.hasTrackHeadingInfo());
// SIL supplement in version 2
if (msg instanceof SurfaceOperationalStatusV2Msg) {
System.out.println(" Has SIL supplement: " + ((SurfaceOperationalStatusV2Msg) msg).hasSILSupplement());
}
break;
case ADSB_TCAS:
TCASResolutionAdvisoryMsg tcas = (TCASResolutionAdvisoryMsg) msg;
System.out.println("["+icao24+"]: TCAS Resolution Advisory completed: "+tcas.hasRATerminated());
System.out.println(" Threat type is "+tcas.getThreatType());
if (tcas.getThreatType() == 1) // it's a icao24 address
System.out.println(" Threat identity is 0x"+String.format("%06x", tcas.getThreatIdentity()));
break;
case ADSB_VELOCITY:
VelocityOverGroundMsg veloc = (VelocityOverGroundMsg) msg;
System.out.println("["+icao24+"]: Ground Speed: "+(veloc.hasVelocityInfo() ? veloc.getGroundSpeed() : "unknown")+" kt");
System.out.println(" True Track: "+(veloc.hasVelocityInfo() ? veloc.getTrueTrackAngle() : "unknown")+" °");
System.out.println(" Vertical rate: "+(veloc.hasVerticalRateInfo() ? veloc.getVerticalRate() : "unknown")+" ft/min");
// the IFR flag is only used in ADS-B version 1. Although equipage is low, we still support it
if (decoder.getAdsbVersion(veloc) == 1)
System.out.println(" Has IFR capability: " + veloc.hasIFRCapability());
break;
case ADSB_TARGET_STATE_AND_STATUS:
TargetStateAndStatusMsg tStatus = (TargetStateAndStatusMsg) msg;
System.out.println("["+icao24+"]: Target State and Status reported");
System.out.println(" Navigation Accuracy Category for position (NACp): " + tStatus.getNACp());
System.out.println(" Has operational TCAS: " + tStatus.hasOperationalTCAS());
System.out.println(" Surveillance/Source Integrity Level (SIL): " + tStatus.getSIL());
System.out.println(" Has SIL supplement: " + tStatus.hasSILSupplement());
System.out.println(" Barometric altitude cross-checked: " + tStatus.getBarometricAltitudeIntegrityCode());
System.out.printf(" Selected altitude is derived from %s\n", tStatus.isFMSSelectedAltitude() ? "FMS" : "MCP/FCU");
if (tStatus.hasSelectedAltitudeInfo()) {
System.out.println(" Selected altitude: " + tStatus.getSelectedAltitude() + " ft");
} else {
System.out.println(" No selected altitude info");
}
if (tStatus.hasBarometricPressureSettingInfo()) {
System.out.println(" Barometric pressure setting (minus 800 mbar): " + tStatus.getBarometricPressureSetting() + " mbar");
} else {
System.out.println(" No barometric pressure setting info");
}
if (tStatus.hasSelectedHeadingInfo()) {
System.out.println(" Selected heading: " + tStatus.getSelectedHeading() + "°");
} else {
System.out.println(" No selected heading info");
}
if (tStatus.hasModeInfo()) {
System.out.printf(" Autopilot is%s enganged\n", tStatus.hasAutopilotEngaged() ? "" : " not");
System.out.printf(" VNAV mode is%s enganged\n", tStatus.hasVNAVModeEngaged() ? "" : " not");
System.out.printf(" Altitude hold mode is%s enganged\n", tStatus.hasActiveAltitudeHoldMode() ? "" : " not");
System.out.printf(" Approach mode is%s enganged\n", tStatus.hasActiveApproachMode() ? "" : " not");
System.out.printf(" LNAV mode is%s enganged\n", tStatus.hasLNAVModeEngaged() ? "" : " not");
} else {
System.out.println(" No MCP/FCU mode info");
}
break;
case EXTENDED_SQUITTER:
System.out.println("["+icao24+"]: Unknown extended squitter with type code "+((ExtendedSquitter)msg).getFormatTypeCode()+"!");
break;
}
}
else if (msg.getDownlinkFormat() != 17) { // CRC failed
switch (msg.getType()) {
case MODES_REPLY:
System.out.println("["+icao24+"]: Unknown message with DF "+msg.getDownlinkFormat());
break;
case SHORT_ACAS:
ShortACAS acas = (ShortACAS)msg;
System.out.println("["+icao24+"]: Altitude is "+acas.getAltitude()+"ft and ACAS is "+
(acas.hasOperatingACAS() ? "operating." : "not operating."));
System.out.println(" A/C is "+(acas.isAirborne() ? "airborne" : "on the ground")+
" and sensitivity level is "+acas.getSensitivityLevel());
break;
case ALTITUDE_REPLY:
AltitudeReply alti = (AltitudeReply)msg;
System.out.println("["+icao24+"]: Short altitude reply: "+alti.getAltitude()+"ft");
break;
case IDENTIFY_REPLY:
IdentifyReply identify = (IdentifyReply)msg;
System.out.println("["+icao24+"]: Short identify reply: "+identify.getIdentity());
break;
case ALL_CALL_REPLY:
AllCallReply allcall = (AllCallReply)msg;
System.out.println("["+icao24+"]: All-call reply for "+ Tools.toHexString(allcall.getInterrogatorCode())+
" ("+(allcall.hasValidInterrogatorCode()?"valid":"invalid")+")");
break;
case LONG_ACAS:
LongACAS long_acas = (LongACAS)msg;
System.out.println("["+icao24+"]: Altitude is "+long_acas.getAltitude()+"ft and ACAS is "+
(long_acas.hasOperatingACAS() ? "operating." : "not operating."));
System.out.println(" A/C is "+(long_acas.isAirborne() ? "airborne" : "on the ground")+
" and sensitivity level is "+long_acas.getSensitivityLevel());
System.out.println(" RAC is "+(long_acas.hasValidRAC() ? "valid" : "not valid")+
" and is "+long_acas.getResolutionAdvisoryComplement()+" (MTE="+long_acas.hasMultipleThreats()+")");
System.out.println(" Maximum airspeed is "+long_acas.getMaximumAirspeed()+"kn.");
break;
case MILITARY_EXTENDED_SQUITTER:
MilitaryExtendedSquitter mil = (MilitaryExtendedSquitter)msg;
System.out.println("["+icao24+"]: Military ES of application "+mil.getFirstField());
System.out.println(" Message is 0x"+ Tools.toHexString(mil.getMessage()));
break;
case COMM_B_ALTITUDE_REPLY:
CommBAltitudeReply commBaltitude = (CommBAltitudeReply)msg;
System.out.println("["+icao24+"]: Long altitude reply: "+commBaltitude.getAltitude()+"ft");
break;
case COMM_B_IDENTIFY_REPLY:
CommBIdentifyReply commBidentify = (CommBIdentifyReply)msg;
System.out.println("["+icao24+"]: Long identify reply: "+commBidentify.getIdentity());
break;
case COMM_D_ELM:
CommDExtendedLengthMsg commDELM = (CommDExtendedLengthMsg)msg;
System.out.println("["+icao24+"]: ELM message w/ sequence no "+commDELM.getSequenceNumber()+
" (ACK: "+commDELM.isAck()+")");
System.out.println(" Message is 0x"+ Tools.toHexString(commDELM.getMessage()));
break;
default:
}
}
else {
System.out.println("Message contains biterrors.");
}
}
public static void main(String[] args) throws Exception {
// iterate over STDIN
Scanner sc = new Scanner(System.in, "UTF-8");
ExampleDecoder dec = new ExampleDecoder();
Position rec = new Position(0., 0., 0.);
while(sc.hasNext()) {
String[] values = sc.nextLine().split(",");
if (values.length == 5) {
// time,serial,lat,lon,msg
rec.setLatitude(Double.parseDouble(values[2]));
rec.setLongitude(Double.parseDouble(values[3]));
dec.decodeMsg((long) Double.parseDouble(values[0])*1000, values[4], rec);
} else if (values.length == 4) {
// time,lat,lon,msg
rec.setLatitude(Double.parseDouble(values[1]));
rec.setLongitude(Double.parseDouble(values[2]));
dec.decodeMsg((long) Double.parseDouble(values[0])*1000, values[3], rec);
} else if (values.length == 2) {
// time,msg
dec.decodeMsg((long) Double.parseDouble(values[0])*1000, values[1], null);
}
}
sc.close();
}
}
