ardupilot/ArduSub/inertia.cpp

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#include "Sub.h"
// read_inertia - read inertia in from accelerometers
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void Sub::read_inertia()
{
// inertial altitude estimates
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inertial_nav.update();
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// pull position from ahrs
Location loc;
ahrs.get_location(loc);
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current_loc.lat = loc.lat;
current_loc.lng = loc.lng;
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// exit immediately if we do not have an altitude estimate
if (!inertial_nav.get_filter_status().flags.vert_pos) {
return;
}
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current_loc.alt = inertial_nav.get_position_z_up_cm();
// get velocity, altitude is always absolute frame, referenced from
// water's surface
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climb_rate = inertial_nav.get_velocity_z_up_cms();
}