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| A Method of Intercalibration for GPS and High Precision Baro-Altimeter on Line |
| Gong Xiao-lin;Fang Jian-cheng; Sheng Wei |
School of Instrument Science and Opto-electronics Engineering,
Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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Abstract According to the different characteristic of the height error’s measurement between Global Positioning System(GPS) and baro-altimeter, an error model of baro-altimeter based on third differential is established, and a method of intercalibration for GPS and high precision baro-altimeter on line is proposed. The adaptive Kalman filter based on the current statistical model is used in this method, which combined GPS and baro-altimeter efficaciously. This method can track the acceleration mean and covariance adaptively, and adjust the process noise covariance matrix and state parameters adaptively. At the same time, fading factor is used to make the best of current measurement data, and then improve the dynamics of filter. Based on the trajectory of real fairway, the semi-physical simulation results illustrate the validity of this method.
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Received: 29 January 2008
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2009, Vol. 31 
