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author | Lorenz Meier <lm@inf.ethz.ch> | 2013-01-09 16:37:45 +0100 |
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committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-01-09 16:37:45 +0100 |
commit | 16e49c447d788c73535a6dd36474673cbf9b8e4f (patch) | |
tree | 5d9770de8c0450108a3c425352ae7e662a2add38 /apps/systemlib/airspeed.h | |
parent | e1a6f1b9107c67179c9499e252c16ed6ea4bc2da (diff) | |
download | px4-firmware-16e49c447d788c73535a6dd36474673cbf9b8e4f.tar.gz px4-firmware-16e49c447d788c73535a6dd36474673cbf9b8e4f.tar.bz2 px4-firmware-16e49c447d788c73535a6dd36474673cbf9b8e4f.zip |
Added support for battery voltage and differential pressure to logging and plot script
Diffstat (limited to 'apps/systemlib/airspeed.h')
-rw-r--r-- | apps/systemlib/airspeed.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/apps/systemlib/airspeed.h b/apps/systemlib/airspeed.h new file mode 100644 index 000000000..62acfe2b0 --- /dev/null +++ b/apps/systemlib/airspeed.h @@ -0,0 +1,86 @@ +/**************************************************************************** + * + * Copyright (C) 2012-2013 PX4 Development Team. All rights reserved. + * Author: Lorenz Meier <lm@inf.ethz.ch> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file airspeed.c + * Airspeed estimation + * + * @author Lorenz Meier <lm@inf.ethz.ch> + * + */ + +#include "math.h" +#include "conversions.h" + + __BEGIN_DECLS + +/** + * Calculate indicated airspeed. + * + * Note that the indicated airspeed is not the true airspeed because it + * lacks the air density compensation. Use the calc_true_airspeed functions to get + * the true airspeed. + * + * @param pressure_front pressure inside the pitot/prandl tube + * @param pressure_ambient pressure at the side of the tube/airplane + * @param temperature air temperature in degrees celcius + * @return indicated airspeed in m/s + */ +__EXPORT float calc_indicated_airspeed(float pressure_front, float pressure_ambient, float temperature); + +/** + * Calculate true airspeed from indicated airspeed. + * + * Note that the true airspeed is NOT the groundspeed, because of the effects of wind + * + * @param speed current indicated airspeed + * @param pressure_ambient pressure at the side of the tube/airplane + * @param temperature air temperature in degrees celcius + * @return true airspeed in m/s + */ +__EXPORT float calc_true_airspeed_from_indicated(float speed, float pressure_ambient, float temperature); + +/** + * Directly calculate true airspeed + * + * Note that the true airspeed is NOT the groundspeed, because of the effects of wind + * + * @param pressure_front pressure inside the pitot/prandl tube + * @param pressure_ambient pressure at the side of the tube/airplane + * @param temperature air temperature in degrees celcius + * @return true airspeed in m/s + */ +__EXPORT float calc_true_airspeed(float pressure_front, float pressure_ambient, float temperature); + +__END_DECLS
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