High-precision barometric altitude measurement method and technology

High-precision barometric altitude measurement method and technology are studied in this paper. A new MEMS piezoresistive pressure sensor and microprocessor are used to realize altitude measurement. Temperature drift error of the pressure sensor is compensated by quadratic pressure compensation algorithm and the compensated pressure value is digitally filtered by median filtering combined with an arithmetic average filtering method to further improve the measurement accuracy. Experimental results show that the designed method can operate at the altitude of -0.75 km to 10 km, with a resolution up to 0.62 m, and it has the advantages of small size, low power consumption, high precision, reliable etc. This method and technology can be used to assist GPS navigation, flight control and portable devices to conduct high-precision altitude measurement, positioning, navigation.