ArduCopter: first implementation of surface tracking using sonar

Note: not yet enabled as part of any flight mode
This commit is contained in:
rmackay9 2012-12-29 13:51:14 +09:00
parent 07a3a7d4bb
commit b9dbdadc80
4 changed files with 59 additions and 2 deletions

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@ -673,6 +673,7 @@ static int16_t climb_rate_error;
static int16_t climb_rate; static int16_t climb_rate;
// The altitude as reported by Sonar in cm Values are 20 to 700 generally. // The altitude as reported by Sonar in cm Values are 20 to 700 generally.
static int16_t sonar_alt; static int16_t sonar_alt;
static bool sonar_alt_ok; // true if we can trust the altitude from the sonar
// The climb_rate as reported by sonar in cm/s // The climb_rate as reported by sonar in cm/s
static int16_t sonar_rate; static int16_t sonar_rate;
// The altitude as reported by Baro in cm Values can be quite high // The altitude as reported by Baro in cm Values can be quite high
@ -1797,6 +1798,17 @@ bool set_throttle_mode( uint8_t new_throttle_mode )
throttle_initialised = true; throttle_initialised = true;
break; break;
case THROTTLE_SURFACE_TRACKING:
if( g.sonar_enabled ) {
set_new_altitude(current_loc.alt); // by default hold the current altitude
if ( throttle_mode < THROTTLE_HOLD ) { // reset the alt hold I terms if previous throttle mode was manual
reset_throttle_I();
}
throttle_initialised = true;
}
// To-Do: handle the case where the sonar is not enabled
break;
default: default:
// To-Do: log an error message to the dataflash or tlogs instead of printing to the serial port // To-Do: log an error message to the dataflash or tlogs instead of printing to the serial port
cliSerial->printf_P(PSTR("Unsupported throttle mode: %d!!"),new_throttle_mode); cliSerial->printf_P(PSTR("Unsupported throttle mode: %d!!"),new_throttle_mode);
@ -1953,6 +1965,18 @@ void update_throttle_mode(void)
// landing throttle controller // landing throttle controller
get_throttle_land(); get_throttle_land();
break; break;
case THROTTLE_SURFACE_TRACKING:
// surface tracking with sonar or other rangefinder plus pilot input of climb rate
pilot_climb_rate = get_pilot_desired_climb_rate(g.rc_3.control_in);
if( sonar_alt_ok ) {
// if sonar is ok, use surface tracking
get_throttle_surface_tracking(pilot_climb_rate);
}else{
// if no sonar fall back stabilize rate controller
get_throttle_rate_stabilized(pilot_climb_rate);
}
break;
} }
} }

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@ -1052,8 +1052,8 @@ get_throttle_rate_stabilized(int16_t target_rate)
static void static void
get_throttle_land() get_throttle_land()
{ {
// if we are above 10m perform regular alt hold descent // if we are above 10m and the sonar does not sense anything perform regular alt hold descent
if (current_loc.alt >= LAND_START_ALT) { if (current_loc.alt >= LAND_START_ALT && !(g.sonar_enabled && sonar_alt_ok)) {
get_throttle_althold(LAND_START_ALT, g.auto_velocity_z_min, -abs(g.land_speed)); get_throttle_althold(LAND_START_ALT, g.auto_velocity_z_min, -abs(g.land_speed));
}else{ }else{
get_throttle_rate_stabilized(-abs(g.land_speed)); get_throttle_rate_stabilized(-abs(g.land_speed));
@ -1078,6 +1078,32 @@ get_throttle_land()
} }
} }
// get_throttle_surface_tracking - hold copter at the desired distance above the ground
// updates accel based throttle controller targets
static void
get_throttle_surface_tracking(int16_t target_rate)
{
static float target_sonar_alt = 0; // The desired altitude in cm above the ground
static uint32_t last_call_ms = 0;
uint32_t now = millis();
// reset target altitude if this controller has just been engaged
if( now - last_call_ms > 1000 ) {
target_sonar_alt = sonar_alt + next_WP.alt - current_loc.alt;
}
last_call_ms = millis();
target_sonar_alt += target_rate * 0.02;
// do not let target altitude get too far from current altitude above ground
// Note: the 750cm limit is perhaps too wide but is consistent with the regular althold limits and helps ensure a smooth transition
target_sonar_alt = constrain(target_sonar_alt,sonar_alt-750,sonar_alt+750);
set_new_altitude(current_loc.alt+(target_sonar_alt-sonar_alt));
get_throttle_althold(next_WP.alt, -g.pilot_velocity_z_max-250, g.pilot_velocity_z_max+250); // 250 is added to give head room to alt hold controller
}
/* /*
* reset all I integrators * reset all I integrators
*/ */

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@ -39,6 +39,7 @@
#define THROTTLE_HOLD 6 // alt hold plus pilot input of climb rate #define THROTTLE_HOLD 6 // alt hold plus pilot input of climb rate
#define THROTTLE_AUTO 7 // auto pilot altitude controller with target altitude held in next_WP.alt #define THROTTLE_AUTO 7 // auto pilot altitude controller with target altitude held in next_WP.alt
#define THROTTLE_LAND 8 // landing throttle controller #define THROTTLE_LAND 8 // landing throttle controller
#define THROTTLE_SURFACE_TRACKING 9 // ground tracking with sonar or other rangefinder
// active altitude sensor // active altitude sensor

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@ -37,6 +37,12 @@ static int16_t read_sonar(void)
#if CONFIG_SONAR == ENABLED #if CONFIG_SONAR == ENABLED
int16_t temp_alt = sonar.read(); int16_t temp_alt = sonar.read();
if(temp_alt >= sonar.min_distance && temp_alt <= sonar.max_distance * 0.70) {
sonar_alt_ok = true;
}else{
sonar_alt_ok = false;
}
#if SONAR_TILT_CORRECTION == 1 #if SONAR_TILT_CORRECTION == 1
// correct alt for angle of the sonar // correct alt for angle of the sonar
float temp = cos_pitch_x * cos_roll_x; float temp = cos_pitch_x * cos_roll_x;