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track.h
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track.h
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// Part of dump1090, a Mode S message decoder for RTLSDR devices.
//
// track.h: aircraft state tracking prototypes
//
// Copyright (c) 2014,2015 Oliver Jowett <oliver@mutability.co.uk>
//
// This file is free software: you may copy, redistribute and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation, either version 2 of the License, or (at your
// option) any later version.
//
// This file 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 this program. If not, see <http://www.gnu.org/licenses/>.
// This file incorporates work covered by the following copyright and
// permission notice:
//
// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef DUMP1090_TRACK_H
#define DUMP1090_TRACK_H
/* Maximum age of tracked aircraft in milliseconds */
#define TRACK_AIRCRAFT_TTL 300000
/* Maximum age of a tracked aircraft with only 1 message received, in milliseconds */
#define TRACK_AIRCRAFT_ONEHIT_TTL 60000
/* Maximum validity of an aircraft position */
#define TRACK_AIRCRAFT_POSITION_TTL 60000
/* Structure used to describe the state of one tracked aircraft */
struct aircraft {
uint32_t addr; // ICAO address
char flight[16]; // Flight number
double signalLevel[8]; // Last 8 Signal Amplitudes
int signalNext; // next index of signalLevel to use
int altitude; // Altitude (Baro)
int altitude_hae; // Altitude (HAE)
int hae_delta; // Difference between HAE and Baro altitudes
int speed; // Velocity
int track; // Angle of flight
int vert_rate; // Vertical rate.
uint64_t seen; // Time (millis) at which the last packet was received
uint64_t seenLatLon; // Time (millis) at which lat, lon was measured
uint64_t seenAltitude; // Time (millis) at which altitude was measured
uint64_t seenSpeed; // Time (millis) at which speed was measured
uint64_t seenTrack; // Time (millis) at which track was measured
int mlatFlags; // Data derived from mlat messages
int tisbFlags; // Data derived from TIS-B messages
long messages; // Number of Mode S messages received
int modeA; // Squawk
int modeC; // Altitude
long modeAcount; // Mode A Squawk hit Count
long modeCcount; // Mode C Altitude hit Count
int modeACflags; // Flags for mode A/C recognition
int fatsv_emitted_altitude; // last FA emitted altitude
int fatsv_emitted_track; // last FA emitted track
int fatsv_emitted_speed; // last FA emitted speed
uint64_t fatsv_last_emitted; // time (millis) aircraft was last FA emitted
// Encoded latitude and longitude as extracted by odd and even CPR encoded messages
uint64_t odd_cprtime;
int odd_cprlat;
int odd_cprlon;
unsigned odd_cprnuc;
uint64_t even_cprtime;
int even_cprlat;
int even_cprlon;
unsigned even_cprnuc;
double lat, lon; // Coordinated obtained from CPR encoded data
unsigned pos_nuc; // NUCp of last computed position
unsigned category; // Aircraft category A0 - D7 encoded as a single hex byte
int bFlags; // Flags related to valid fields in this structure
struct aircraft *next; // Next aircraft in our linked list
struct modesMessage first_message; // A copy of the first message we received for this aircraft.
};
/* Update aircraft state from data in the provided mesage.
* Return the tracked aircraft.
*/
struct modesMessage;
struct aircraft *trackUpdateFromMessage(struct modesMessage *mm);
/* Call periodically */
void trackPeriodicUpdate();
#endif