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Diffstat (limited to 'altoslib/AltosState.java')
| -rw-r--r-- | altoslib/AltosState.java | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/altoslib/AltosState.java b/altoslib/AltosState.java new file mode 100644 index 00000000..0645e448 --- /dev/null +++ b/altoslib/AltosState.java @@ -0,0 +1,210 @@ +/* + * Copyright © 2010 Keith Packard <keithp@keithp.com> + * + * This program 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; version 2 of the License. + * + * This program 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, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +/* + * Track flight state from telemetry or eeprom data stream + */ + +package org.altusmetrum.AltosLib; + +public class AltosState { + public AltosRecord data; + + /* derived data */ + + public long report_time; + + public double time; + public double time_change; + public int tick; + + public int state; + public boolean landed; + public boolean ascent; /* going up? */ + public boolean boost; /* under power */ + + public double ground_altitude; + public double height; + public double speed; + public double acceleration; + public double battery; + public double temperature; + public double main_sense; + public double drogue_sense; + public double baro_speed; + + public double max_height; + public double max_acceleration; + public double max_speed; + public double max_baro_speed; + + public AltosGPS gps; + + public AltosIMU imu; + public AltosMag mag; + + public static final int MIN_PAD_SAMPLES = 10; + + public int npad; + public int ngps; + public int gps_waiting; + public boolean gps_ready; + + public AltosGreatCircle from_pad; + public double elevation; /* from pad */ + public double range; /* total distance */ + + public double gps_height; + + public int speak_tick; + public double speak_altitude; + + public void init (AltosRecord cur, AltosState prev_state) { + int i; + AltosRecord prev; + + data = cur; + + ground_altitude = data.ground_altitude(); + height = data.filtered_height(); + + report_time = System.currentTimeMillis(); + + acceleration = data.acceleration(); + speed = data.accel_speed(); + temperature = data.temperature(); + drogue_sense = data.drogue_voltage(); + main_sense = data.main_voltage(); + battery = data.battery_voltage(); + tick = data.tick; + state = data.state; + + if (prev_state != null) { + + /* Preserve any existing gps data */ + npad = prev_state.npad; + ngps = prev_state.ngps; + gps = prev_state.gps; + pad_lat = prev_state.pad_lat; + pad_lon = prev_state.pad_lon; + pad_alt = prev_state.pad_alt; + max_height = prev_state.max_height; + max_acceleration = prev_state.max_acceleration; + max_speed = prev_state.max_speed; + max_baro_speed = prev_state.max_baro_speed; + imu = prev_state.imu; + mag = prev_state.mag; + + /* make sure the clock is monotonic */ + while (tick < prev_state.tick) + tick += 65536; + + time_change = (tick - prev_state.tick) / 100.0; + + /* compute barometric speed */ + + double height_change = height - prev_state.height; + if (data.speed != AltosRecord.MISSING) + baro_speed = data.speed; + else { + if (time_change > 0) + baro_speed = (prev_state.baro_speed * 3 + (height_change / time_change)) / 4.0; + else + baro_speed = prev_state.baro_speed; + } + } else { + npad = 0; + ngps = 0; + gps = null; + baro_speed = 0; + time_change = 0; + } + + time = tick / 100.0; + + if (cur.new_gps && (state == AltosLib.ao_flight_pad || state == AltosLib.ao_flight_idle)) { + + /* Track consecutive 'good' gps reports, waiting for 10 of them */ + if (data.gps != null && data.gps.locked && data.gps.nsat >= 4) + npad++; + else + npad = 0; + + /* Average GPS data while on the pad */ + if (data.gps != null && data.gps.locked && data.gps.nsat >= 4) { + if (ngps > 1) { + /* filter pad position */ + pad_lat = (pad_lat * 31.0 + data.gps.lat) / 32.0; + pad_lon = (pad_lon * 31.0 + data.gps.lon) / 32.0; + pad_alt = (pad_alt * 31.0 + data.gps.alt) / 32.0; + } else { + pad_lat = data.gps.lat; + pad_lon = data.gps.lon; + pad_alt = data.gps.alt; + } + ngps++; + } + } + + gps_waiting = MIN_PAD_SAMPLES - npad; + if (gps_waiting < 0) + gps_waiting = 0; + + gps_ready = gps_waiting == 0; + + ascent = (AltosLib.ao_flight_boost <= state && + state <= AltosLib.ao_flight_coast); + boost = (AltosLib.ao_flight_boost == state); + + /* Only look at accelerometer data under boost */ + if (boost && acceleration > max_acceleration) + max_acceleration = acceleration; + if (boost && speed > max_speed) + max_speed = speed; + if (boost && baro_speed > max_baro_speed) + max_baro_speed = baro_speed; + + if (height > max_height) + max_height = height; + if (data.gps != null) { + if (gps == null || !gps.locked || data.gps.locked) + gps = data.gps; + if (ngps > 0 && gps.locked) { + from_pad = new AltosGreatCircle(pad_lat, pad_lon, gps.lat, gps.lon); + } + } + elevation = 0; + range = -1; + if (ngps > 0) { + gps_height = gps.alt - pad_alt; + if (from_pad != null) { + elevation = Math.atan2(height, from_pad.distance) * 180 / Math.PI; + range = Math.sqrt(height * height + from_pad.distance * from_pad.distance); + } + } else { + gps_height = 0; + } + } + + public AltosState(AltosRecord cur) { + init(cur, null); + } + + public AltosState (AltosRecord cur, AltosState prev) { + init(cur, prev); + } +} |