ardupilot/Tools/autotest/aircraft/Rascal/Systems/airdata.nas

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var last_time = 0.0;
var last_speed = 0.0;
var speed_sensed = 0.0;
var sensor_step = 1.0;
var speed_filt = 0.0;
var accel_filt = 0.0;
var compute_airspeed_accel = func( speed_filt, dt ) {
# print ( "computing forward acceleration ", dt );
var delta_speed = speed_filt - last_speed;
last_speed = speed_filt;
var accel = delta_speed / dt;
return accel;
}
var update_airdata = func( dt ) {
# crude model of a noisy electronic pitot tube
sensed_speed = getprop("/velocities/airspeed-kt");
var r = rand();
if ( r < 0.3333 ) {
sensed_speed = sensed_speed - sensor_step;
} elsif ( r > 0.6666 ) {
sensed_speed = sensed_speed + sensor_step;
}
speed_filt = 0.97 * speed_filt + 0.03 * sensed_speed;
var sensed_accel = 0.0;
if ( dt > 0 ) {
sensed_accel = compute_airspeed_accel( speed_filt, dt );
}
accel_filt = 0.97 * accel_filt + 0.03 * sensed_accel;
setprop("/accelerations/airspeed-ktps", accel_filt);
}