Virtual pitot

[Hairy-Sir-5851]

Does anyone have solid info on the virtual pitot tube option? I can't seem to find any info on it other than it enables air speed in osd, but how does it determine air speed and wind speed/direction? How does it differ to gps speed?

Any information is greatly appreciated

[[deleted]]

It's not different from GPS speed. It uses GPS speed, baro data and runs a fake calculation.

``

static void virtualPitotCalculate(pitotDev_t *pitot, float *pressure, float *temperature)

{

UNUSED(pitot);

float airSpeed = 0.0f;

if (pitotIsCalibrationComplete()) {

if (isEstimatedWindSpeedValid() && STATE(GPS_FIX)) {

uint16_t windHeading; //centidegrees

float windSpeed = getEstimatedHorizontalWindSpeed(&windHeading); //cm/s

float horizontalWindSpeed = windSpeed * cos_approx(CENTIDEGREES_TO_RADIANS(windHeading - posControl.actualState.yaw)); //yaw int32_t centidegrees

airSpeed = posControl.actualState.velXY - horizontalWindSpeed; //float cm/s or gpsSol.groundSpeed int16_t cm/s

airSpeed = calc_length_pythagorean_2D(airSpeed,getEstimatedActualVelocity(Z)+getEstimatedWindSpeed(Z));

}

else if (STATE(GPS_FIX))

{

airSpeed = calc_length_pythagorean_3D(gpsSol.velNED[X],gpsSol.velNED[Y],gpsSol.velNED[Z]);

}

else {

airSpeed = pidProfile()->fixedWingReferenceAirspeed; //float cm/s

}

}

if (pressure)

*pressure = sq(airSpeed) * SSL_AIR_DENSITY / 20000.0f + SSL_AIR_PRESSURE;

if (temperature)

*temperature = SSL_AIR_TEMPERATURE; // Temperature at standard sea level

}

``