Encyclopedia > Attitude and Heading Reference Systems
Attitude and Heading Reference Systems (AHRS) are 3-axis sensors that provide heading, attitude and yaw information for aircraft. AHRS are designed to replace traditional mechanical gyroscopicflight instruments and provide superior reliability and accuracy. A gyroscope is a device which demonstrates the principle of conservation of angular momentum, in physics. ... Six basic instruments in a light twin-engine airplane arranged in the basic-T. From top left: airspeed indicator, attitude indicator, altimeter, turn coordinator, heading indicator, and vertical speed indicator Most aircraft are equipped with a standard set of flight instruments which give the pilot information about the aircrafts...
AHRS consist of either solid-state or MEMS gyroscopes, accelerometers and magnetometers on all three axes. Some AHRS use GPS receivers to improve long-term stability of the gyroscopes. A Kalman filter is typically used to compute the solution from these multiple sources. AHRS differ from traditional inertial navigation systems by using magnetometer and/or GPS data to correct the raw gyroscopic data. A mite next to a gear set produced using MEMS. Courtesy Sandia National Laboratories, SUMMiTTM Technologies, www. ... An accelerometer or gravimeter is a device for measuring acceleration and the effects of gravity. ... A magnetometer is a scientific instrument used to measure the strength of magnetic fields. ... Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ... The Kalman filter is an efficient recursive filter which estimates the state of a dynamic system from a series of incomplete and noisy measurements. ... This article or section does not adequately cite its references or sources. ...
AHRS have proven themselves to be highly reliable and are in common use in commercial and business aircraft. Recent advances in MEMS manufacturing have brought the price of FAA certified AHRS down to below $15,000. AHRS are typically integrated into Electronic Flight Information Systems (EFIS), which are the central part of so-called glass cockpits. AHRS are often combined with air data computers to form an "air data, attitude and heading reference systems" (ADAHRS), which provide additional information such as airspeed, altitude and outside air temperature. FAA redirects here. ... Electronic Flight Information Systems are systems where primary flight and navigational data in an aircraft is displayed on an electronic system, normally a liquid-crystal display. ... A Glass cockpit is an aircraft cockpit that features electronic instrument displays. ... An air data computer is an essential avionics component found in modern glass cockpits. ...
AHRS differ from traditional inertial navigation systems by using magnetometer and/or GPS data to correct the raw gyroscopic data.
AHRS are typically integrated into Electronic Flight Information Systems (EFIS), which are the central part of so-called glass cockpits.
AHRS are often combined with air data computers to form an "air data, attitude and headingreferencesystems" (ADAHRS), which provide additional information such as airspeed, altitude and outside air temperature.
Feeds |
Contact