ardupilot/APMrover2/navigation.pde

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
//****************************************************************
// Function that will calculate the desired direction to fly and distance
//****************************************************************
static void navigate()
{
// do not navigate with corrupt data
// ---------------------------------
if (g_gps->fix == 0)
{
g_gps->new_data = false;
return;
}
if ((next_WP.lat == 0)||(home_is_set==false)){
return;
}
// waypoint distance from plane
// ----------------------------
wp_distance = get_distance(&current_loc, &next_WP);
if (wp_distance < 0){
gcs_send_text_P(SEVERITY_HIGH,PSTR("<navigate> WP error - distance < 0"));
return;
}
// target_bearing is where we should be heading
// --------------------------------------------
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target_bearing = get_bearing_cd(&current_loc, &next_WP);
// nav_bearing will includes xtrac correction
// ------------------------------------------
nav_bearing = target_bearing;
// control mode specific updates to nav_bearing
// --------------------------------------------
update_navigation();
}
static void calc_gndspeed_undershoot()
{
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if (g_gps->status() == GPS::GPS_OK) {
// Function is overkill, but here in case we want to add filtering later
groundspeed_undershoot = (g.min_gndspeed > 0) ? (g.min_gndspeed - ground_speed) : 0;
}
}
static void calc_bearing_error()
{
bearing_error = nav_bearing - ahrs.yaw_sensor;
bearing_error = wrap_180(bearing_error);
}
static long wrap_360(long error)
{
if (error > 36000) error -= 36000;
if (error < 0) error += 36000;
return error;
}
static long wrap_180(long error)
{
if (error > 18000) error -= 36000;
if (error < -18000) error += 36000;
return error;
}
static void update_crosstrack(void)
{
// Crosstrack Error
// ----------------
if (abs(wrap_180(target_bearing - crosstrack_bearing)) < 4500) { // If we are too far off or too close we don't do track following
crosstrack_error = sin(radians((target_bearing - crosstrack_bearing) / (float)100)) * (float)wp_distance; // Meters we are off track line
nav_bearing += constrain(crosstrack_error * g.crosstrack_gain, -g.crosstrack_entry_angle.get(), g.crosstrack_entry_angle.get());
nav_bearing = wrap_360(nav_bearing);
}
}
static void reset_crosstrack()
{
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crosstrack_bearing = get_bearing_cd(&prev_WP, &next_WP); // Used for track following
}
void reached_waypoint()
{
}