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   1 /*
   2  * Copyright © 2010 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 /*
  19  * Track flight state from telemetry or eeprom data stream
  20  */
  21
  22 package org.altusmetrum.AltosLib;
  23
  24 public class AltosState {
  25         public AltosRecord data;
  26
  27         /* derived data */
  28
  29         public long     report_time;
  30
  31         public double   time;
  32         public double   time_change;
  33         public int      tick;
  34
  35         public int      state;
  36         public boolean  landed;
  37         public boolean  ascent; /* going up? */
  38         public boolean boost;   /* under power */
  39
  40         public double   ground_altitude;
  41         public double   height;
  42         public double   speed;
  43         public double   acceleration;
  44         public double   battery;
  45         public double   temperature;
  46         public double   main_sense;
  47         public double   drogue_sense;
  48         public double   baro_speed;
  49
  50         public double   max_height;
  51         public double   max_acceleration;
  52         public double   max_speed;
  53         public double   max_baro_speed;
  54
  55         public AltosGPS gps;
  56
  57         public double   pad_lat;
  58         public double   pad_lon;
  59         public double   pad_alt;
  60
  61         public static final int MIN_PAD_SAMPLES = 10;
  62
  63         public int      npad;
  64         public int      ngps;
  65         public int      gps_waiting;
  66         public boolean  gps_ready;
  67
  68         public AltosGreatCircle from_pad;
  69         public double   elevation;      /* from pad */
  70         public double   range;          /* total distance */
  71
  72         public double   gps_height;
  73
  74         public int      speak_tick;
  75         public double   speak_altitude;
  76
  77         public void init (AltosRecord cur, AltosState prev_state) {
  78                 int             i;
  79                 AltosRecord prev;
  80
  81                 data = cur;
  82
  83                 ground_altitude = data.ground_altitude();
  84                 height = data.filtered_height();
  85
  86                 report_time = System.currentTimeMillis();
  87
  88                 acceleration = data.acceleration();
  89                 speed = data.accel_speed();
  90                 temperature = data.temperature();
  91                 drogue_sense = data.drogue_voltage();
  92                 main_sense = data.main_voltage();
  93                 battery = data.battery_voltage();
  94                 tick = data.tick;
  95                 state = data.state;
  96
  97                 if (prev_state != null) {
  98
  99                         /* Preserve any existing gps data */
 100                         npad = prev_state.npad;
 101                         ngps = prev_state.ngps;
 102                         gps = prev_state.gps;
 103                         pad_lat = prev_state.pad_lat;
 104                         pad_lon = prev_state.pad_lon;
 105                         pad_alt = prev_state.pad_alt;
 106                         max_height = prev_state.max_height;
 107                         max_acceleration = prev_state.max_acceleration;
 108                         max_speed = prev_state.max_speed;
 109                         max_baro_speed = prev_state.max_baro_speed;
 110
 111                         /* make sure the clock is monotonic */
 112                         while (tick < prev_state.tick)
 113                                 tick += 65536;
 114
 115                         time_change = (tick - prev_state.tick) / 100.0;
 116
 117                         /* compute barometric speed */
 118
 119                         double height_change = height - prev_state.height;
 120                         if (data.speed != AltosRecord.MISSING)
 121                                 baro_speed = data.speed;
 122                         else {
 123                                 if (time_change > 0)
 124                                         baro_speed = (prev_state.baro_speed * 3 + (height_change / time_change)) / 4.0;
 125                                 else
 126                                         baro_speed = prev_state.baro_speed;
 127                         }
 128                 } else {
 129                         npad = 0;
 130                         ngps = 0;
 131                         gps = null;
 132                         baro_speed = 0;
 133                         time_change = 0;
 134                 }
 135
 136                 time = tick / 100.0;
 137
 138                 if (cur.new_gps && (state == AltosLib.ao_flight_pad || state == AltosLib.ao_flight_idle)) {
 139
 140                         /* Track consecutive 'good' gps reports, waiting for 10 of them */
 141                         if (data.gps != null && data.gps.locked && data.gps.nsat >= 4)
 142                                 npad++;
 143                         else
 144                                 npad = 0;
 145
 146                         /* Average GPS data while on the pad */
 147                         if (data.gps != null && data.gps.locked && data.gps.nsat >= 4) {
 148                                 if (ngps > 1) {
 149                                         /* filter pad position */
 150                                         pad_lat = (pad_lat * 31.0 + data.gps.lat) / 32.0;
 151                                         pad_lon = (pad_lon * 31.0 + data.gps.lon) / 32.0;
 152                                         pad_alt = (pad_alt * 31.0 + data.gps.alt) / 32.0;
 153                                 } else {
 154                                         pad_lat = data.gps.lat;
 155                                         pad_lon = data.gps.lon;
 156                                         pad_alt = data.gps.alt;
 157                                 }
 158                                 ngps++;
 159                         }
 160                 }
 161
 162                 gps_waiting = MIN_PAD_SAMPLES - npad;
 163                 if (gps_waiting < 0)
 164                         gps_waiting = 0;
 165
 166                 gps_ready = gps_waiting == 0;
 167
 168                 ascent = (AltosLib.ao_flight_boost <= state &&
 169                           state <= AltosLib.ao_flight_coast);
 170                 boost = (AltosLib.ao_flight_boost == state);
 171
 172                 /* Only look at accelerometer data under boost */
 173                 if (boost && acceleration > max_acceleration)
 174                         max_acceleration = acceleration;
 175                 if (boost && speed > max_speed)
 176                         max_speed = speed;
 177                 if (boost && baro_speed > max_baro_speed)
 178                         max_baro_speed = baro_speed;
 179
 180                 if (height > max_height)
 181                         max_height = height;
 182                 if (data.gps != null) {
 183                         if (gps == null || !gps.locked || data.gps.locked)
 184                                 gps = data.gps;
 185                         if (ngps > 0 && gps.locked) {
 186                                 from_pad = new AltosGreatCircle(pad_lat, pad_lon, gps.lat, gps.lon);
 187                         }
 188                 }
 189                 elevation = 0;
 190                 range = -1;
 191                 if (ngps > 0) {
 192                         gps_height = gps.alt - pad_alt;
 193                         if (from_pad != null) {
 194                                 elevation = Math.atan2(height, from_pad.distance) * 180 / Math.PI;
 195                                 range = Math.sqrt(height * height + from_pad.distance * from_pad.distance);
 196                         }
 197                 } else {
 198                         gps_height = 0;
 199                 }
 200         }
 201
 202         public AltosState(AltosRecord cur) {
 203                 init(cur, null);
 204         }
 205
 206         public AltosState (AltosRecord cur, AltosState prev) {
 207                 init(cur, prev);
 208         }
 209 }