コード例 #1
0
static void attitude_run_indi(int32_t indi_commands[], struct Int32Quat *att_err, bool_t in_flight)
{
  //Calculate required angular acceleration
  struct FloatRates *body_rate = stateGetBodyRates_f();
  indi.angular_accel_ref.p = reference_acceleration.err_p * QUAT1_FLOAT_OF_BFP(att_err->qx)
                             - reference_acceleration.rate_p * body_rate->p;
  indi.angular_accel_ref.q = reference_acceleration.err_q * QUAT1_FLOAT_OF_BFP(att_err->qy)
                             - reference_acceleration.rate_q * body_rate->q;
  indi.angular_accel_ref.r = reference_acceleration.err_r * QUAT1_FLOAT_OF_BFP(att_err->qz)
                             - reference_acceleration.rate_r * body_rate->r;

  //Incremented in angular acceleration requires increment in control input
  //G1 is the actuator effectiveness. In the yaw axis, we need something additional: G2.
  //It takes care of the angular acceleration caused by the change in rotation rate of the propellers
  //(they have significant inertia, see the paper mentioned in the header for more explanation)
  indi.du.p = 1.0 / g1.p * (indi.angular_accel_ref.p - indi.filtered_rate_deriv.p);
  indi.du.q = 1.0 / g1.q * (indi.angular_accel_ref.q - indi.filtered_rate_deriv.q);
  indi.du.r = 1.0 / (g1.r + g2) * (indi.angular_accel_ref.r - indi.filtered_rate_deriv.r + g2 * indi.du.r);

  //add the increment to the total control input
  indi.u_in.p = indi.u.p + indi.du.p;
  indi.u_in.q = indi.u.q + indi.du.q;
  indi.u_in.r = indi.u.r + indi.du.r;

  //bound the total control input
  Bound(indi.u_in.p, -4500, 4500);
  Bound(indi.u_in.q, -4500, 4500);
  Bound(indi.u_in.r, -4500, 4500);

  //Propagate input filters
  //first order actuator dynamics
  indi.u_act_dyn.p = indi.u_act_dyn.p + STABILIZATION_INDI_ACT_DYN_P * (indi.u_in.p - indi.u_act_dyn.p);
  indi.u_act_dyn.q = indi.u_act_dyn.q + STABILIZATION_INDI_ACT_DYN_Q * (indi.u_in.q - indi.u_act_dyn.q);
  indi.u_act_dyn.r = indi.u_act_dyn.r + STABILIZATION_INDI_ACT_DYN_R * (indi.u_in.r - indi.u_act_dyn.r);

  //sensor filter
  stabilization_indi_second_order_filter(&indi.u_act_dyn, &indi.udotdot, &indi.udot, &indi.u,
                                         STABILIZATION_INDI_FILT_OMEGA, STABILIZATION_INDI_FILT_ZETA, STABILIZATION_INDI_FILT_OMEGA_R);

  //Don't increment if thrust is off
  if (stabilization_cmd[COMMAND_THRUST] < 300) {
    FLOAT_RATES_ZERO(indi.u);
    FLOAT_RATES_ZERO(indi.du);
    FLOAT_RATES_ZERO(indi.u_act_dyn);
    FLOAT_RATES_ZERO(indi.u_in);
    FLOAT_RATES_ZERO(indi.udot);
    FLOAT_RATES_ZERO(indi.udotdot);
  } else {
#if STABILIZATION_INDI_USE_ADAPTIVE
#warning "Use caution with adaptive indi. See the wiki for more info"
    lms_estimation();
#endif
  }

  /*  INDI feedback */
  indi_commands[COMMAND_ROLL] = indi.u_in.p;
  indi_commands[COMMAND_PITCH] = indi.u_in.q;
  indi_commands[COMMAND_YAW] = indi.u_in.r;
}
コード例 #2
0
static void attitude_run_fb(int32_t fb_commands[], struct Int32AttitudeGains *gains, struct Int32Quat *att_err,
                            struct Int32Rates *rate_err, struct Int32Quat *sum_err)
{
  /*  PID feedback */
  fb_commands[COMMAND_ROLL] =
    GAIN_PRESCALER_P * gains->p.x  * QUAT1_FLOAT_OF_BFP(att_err->qx) +
    GAIN_PRESCALER_D * gains->d.x  * RATE_FLOAT_OF_BFP(rate_err->p) +
    GAIN_PRESCALER_I * gains->i.x  * QUAT1_FLOAT_OF_BFP(sum_err->qx);

  fb_commands[COMMAND_PITCH] =
    GAIN_PRESCALER_P * gains->p.y  * QUAT1_FLOAT_OF_BFP(att_err->qy) +
    GAIN_PRESCALER_D * gains->d.y  * RATE_FLOAT_OF_BFP(rate_err->q) +
    GAIN_PRESCALER_I * gains->i.y  * QUAT1_FLOAT_OF_BFP(sum_err->qy);

  fb_commands[COMMAND_YAW] =
    GAIN_PRESCALER_P * gains->p.z  * QUAT1_FLOAT_OF_BFP(att_err->qz) +
    GAIN_PRESCALER_D * gains->d.z  * RATE_FLOAT_OF_BFP(rate_err->r) +
    GAIN_PRESCALER_I * gains->i.z  * QUAT1_FLOAT_OF_BFP(sum_err->qz);

}
コード例 #3
0
static inline void stabilization_indi_calc_cmd(int32_t indi_commands[], struct Int32Quat *att_err, bool rate_control)
{
  /* Propagate the second order filter on the gyroscopes */
  struct FloatRates *body_rates = stateGetBodyRates_f();
  stabilization_indi_second_order_filter(&indi.rate, body_rates);

  //The rates used for feedback are by default the measured rates. If needed they can be filtered (see below)
  struct FloatRates rates_for_feedback;
  RATES_COPY(rates_for_feedback, (*body_rates));

  //If there is a lot of noise on the gyroscope, it might be good to use the filtered value for feedback.
  //Note that due to the delay, the PD controller can not be as aggressive.
#if STABILIZATION_INDI_FILTER_ROLL_RATE
  rates_for_feedback.p = indi.rate.x.p;
#endif
#if STABILIZATION_INDI_FILTER_PITCH_RATE
  rates_for_feedback.q = indi.rate.x.q;
#endif
#if STABILIZATION_INDI_FILTER_YAW_RATE
  rates_for_feedback.r = indi.rate.x.r;
#endif

  indi.angular_accel_ref.p = indi.reference_acceleration.err_p * QUAT1_FLOAT_OF_BFP(att_err->qx)
                             - indi.reference_acceleration.rate_p * rates_for_feedback.p;

  indi.angular_accel_ref.q = indi.reference_acceleration.err_q * QUAT1_FLOAT_OF_BFP(att_err->qy)
                             - indi.reference_acceleration.rate_q * rates_for_feedback.q;

  //This separates the P and D controller and lets you impose a maximum yaw rate.
  float rate_ref_r = indi.reference_acceleration.err_r * QUAT1_FLOAT_OF_BFP(att_err->qz)/indi.reference_acceleration.rate_r;
  BoundAbs(rate_ref_r, indi.attitude_max_yaw_rate);
  indi.angular_accel_ref.r = indi.reference_acceleration.rate_r * (rate_ref_r - rates_for_feedback.r);

  /* Check if we are running the rate controller and overwrite */
  if(rate_control) {
    indi.angular_accel_ref.p =  indi.reference_acceleration.rate_p * ((float)radio_control.values[RADIO_ROLL]  / MAX_PPRZ * indi.max_rate - body_rates->p);
    indi.angular_accel_ref.q =  indi.reference_acceleration.rate_q * ((float)radio_control.values[RADIO_PITCH] / MAX_PPRZ * indi.max_rate - body_rates->q);
    indi.angular_accel_ref.r =  indi.reference_acceleration.rate_r * ((float)radio_control.values[RADIO_YAW]   / MAX_PPRZ * indi.max_rate - body_rates->r);
  }

  //Increment in angular acceleration requires increment in control input
  //G1 is the control effectiveness. In the yaw axis, we need something additional: G2.
  //It takes care of the angular acceleration caused by the change in rotation rate of the propellers
  //(they have significant inertia, see the paper mentioned in the header for more explanation)
  indi.du.p = 1.0 / indi.g1.p * (indi.angular_accel_ref.p - indi.rate.dx.p);
  indi.du.q = 1.0 / indi.g1.q * (indi.angular_accel_ref.q - indi.rate.dx.q);
  indi.du.r = 1.0 / (indi.g1.r + indi.g2) * (indi.angular_accel_ref.r - indi.rate.dx.r + indi.g2 * indi.du.r);

  //add the increment to the total control input
  indi.u_in.p = indi.u.x.p + indi.du.p;
  indi.u_in.q = indi.u.x.q + indi.du.q;
  indi.u_in.r = indi.u.x.r + indi.du.r;

  //bound the total control input
  Bound(indi.u_in.p, -4500, 4500);
  Bound(indi.u_in.q, -4500, 4500);
  Bound(indi.u_in.r, -4500, 4500);

  //Propagate input filters
  //first order actuator dynamics
  indi.u_act_dyn.p = indi.u_act_dyn.p + STABILIZATION_INDI_ACT_DYN_P * (indi.u_in.p - indi.u_act_dyn.p);
  indi.u_act_dyn.q = indi.u_act_dyn.q + STABILIZATION_INDI_ACT_DYN_Q * (indi.u_in.q - indi.u_act_dyn.q);
  indi.u_act_dyn.r = indi.u_act_dyn.r + STABILIZATION_INDI_ACT_DYN_R * (indi.u_in.r - indi.u_act_dyn.r);

  //sensor filter
  stabilization_indi_second_order_filter(&indi.u, &indi.u_act_dyn);

  //Don't increment if thrust is off
  //TODO: this should be something more elegant, but without this the inputs will increment to the maximum before
  //even getting in the air.
  if (stabilization_cmd[COMMAND_THRUST] < 300) {
    FLOAT_RATES_ZERO(indi.du);
    FLOAT_RATES_ZERO(indi.u_act_dyn);
    FLOAT_RATES_ZERO(indi.u_in);
    FLOAT_RATES_ZERO(indi.u.x);
    FLOAT_RATES_ZERO(indi.u.dx);
    FLOAT_RATES_ZERO(indi.u.ddx);
  } else {
    // only run the estimation if the commands are not zero.
    lms_estimation();
  }

  /*  INDI feedback */
  indi_commands[COMMAND_ROLL] = indi.u_in.p;
  indi_commands[COMMAND_PITCH] = indi.u_in.q;
  indi_commands[COMMAND_YAW] = indi.u_in.r;
}
コード例 #4
0
static inline void stabilization_indi_calc_cmd(int32_t indi_commands[], struct Int32Quat *att_err, bool_t rate_control)
{
  /* Propagate the second order filter on the gyroscopes */
  struct FloatRates *body_rates = stateGetBodyRates_f();
  stabilization_indi_second_order_filter(&indi.rate, body_rates);

#if STABILIZATION_INDI_FILTER_ROLL_RATE
  indi.angular_accel_ref.p = indi.reference_acceleration.err_p * QUAT1_FLOAT_OF_BFP(att_err->qx)
                             - indi.reference_acceleration.rate_p * indi.rate.x.p;
#else
  indi.angular_accel_ref.p = indi.reference_acceleration.err_p * QUAT1_FLOAT_OF_BFP(att_err->qx)
                             - indi.reference_acceleration.rate_p * body_rates->p;
#endif
#if STABILIZATION_INDI_FILTER_PITCH_RATE
  indi.angular_accel_ref.q = indi.reference_acceleration.err_q * QUAT1_FLOAT_OF_BFP(att_err->qy)
                             - indi.reference_acceleration.rate_q * indi.rate.x.q;
#else
  indi.angular_accel_ref.q = indi.reference_acceleration.err_q * QUAT1_FLOAT_OF_BFP(att_err->qy)
                             - indi.reference_acceleration.rate_q * body_rates->q;
#endif
#if STABILIZATION_INDI_FILTER_YAW_RATE
  indi.angular_accel_ref.r = indi.reference_acceleration.err_r * QUAT1_FLOAT_OF_BFP(att_err->qz)
                             - indi.reference_acceleration.rate_r * indi.rate.x.r;
#else
  indi.angular_accel_ref.r = indi.reference_acceleration.err_r * QUAT1_FLOAT_OF_BFP(att_err->qz)
                             - indi.reference_acceleration.rate_r * body_rates->r;
#endif

  /* Check if we are running the rate controller and overwrite */
  if(rate_control) {
    indi.angular_accel_ref.p =  indi.reference_acceleration.rate_p * ((float)radio_control.values[RADIO_ROLL]  / MAX_PPRZ * indi.max_rate - body_rates->p);
    indi.angular_accel_ref.q =  indi.reference_acceleration.rate_q * ((float)radio_control.values[RADIO_PITCH] / MAX_PPRZ * indi.max_rate - body_rates->q);
    indi.angular_accel_ref.r =  indi.reference_acceleration.rate_r * ((float)radio_control.values[RADIO_YAW]   / MAX_PPRZ * indi.max_rate - body_rates->r);
  }

  //Incremented in angular acceleration requires increment in control input
  //G1 is the actuator effectiveness. In the yaw axis, we need something additional: G2.
  //It takes care of the angular acceleration caused by the change in rotation rate of the propellers
  //(they have significant inertia, see the paper mentioned in the header for more explanation)
  indi.du.p = 1.0 / indi.g1.p * (indi.angular_accel_ref.p - indi.rate.dx.p);
  indi.du.q = 1.0 / indi.g1.q * (indi.angular_accel_ref.q - indi.rate.dx.q);
  indi.du.r = 1.0 / (indi.g1.r + indi.g2) * (indi.angular_accel_ref.r - indi.rate.dx.r + indi.g2 * indi.du.r);

  //add the increment to the total control input
  indi.u_in.p = indi.u.x.p + indi.du.p;
  indi.u_in.q = indi.u.x.q + indi.du.q;
  indi.u_in.r = indi.u.x.r + indi.du.r;

  //bound the total control input
  Bound(indi.u_in.p, -4500, 4500);
  Bound(indi.u_in.q, -4500, 4500);
  Bound(indi.u_in.r, -4500, 4500);

  //Propagate input filters
  //first order actuator dynamics
  indi.u_act_dyn.p = indi.u_act_dyn.p + STABILIZATION_INDI_ACT_DYN_P * (indi.u_in.p - indi.u_act_dyn.p);
  indi.u_act_dyn.q = indi.u_act_dyn.q + STABILIZATION_INDI_ACT_DYN_Q * (indi.u_in.q - indi.u_act_dyn.q);
  indi.u_act_dyn.r = indi.u_act_dyn.r + STABILIZATION_INDI_ACT_DYN_R * (indi.u_in.r - indi.u_act_dyn.r);

  //sensor filter
  stabilization_indi_second_order_filter(&indi.u, &indi.u_act_dyn);

  //Don't increment if thrust is off
  if (stabilization_cmd[COMMAND_THRUST] < 300) {
    FLOAT_RATES_ZERO(indi.du);
    FLOAT_RATES_ZERO(indi.u_act_dyn);
    FLOAT_RATES_ZERO(indi.u_in);
    FLOAT_RATES_ZERO(indi.u.x);
    FLOAT_RATES_ZERO(indi.u.dx);
    FLOAT_RATES_ZERO(indi.u.ddx);
  } else {
    lms_estimation();
  }

  /*  INDI feedback */
  indi_commands[COMMAND_ROLL] = indi.u_in.p;
  indi_commands[COMMAND_PITCH] = indi.u_in.q;
  indi_commands[COMMAND_YAW] = indi.u_in.r;
}