Terrain matching algorithm based on path screening
Yazhou Yue · Journal of Chinese Inertial Technology · 2009
In order to reduce computation burden and improve real-time and engineering practicability,a new algorithm of terrain matching based on path screening is proposed by means of the study on a terrain aided navigation system.The algorithm uses terrain gradient to screen the likelihood path during the flight of airplane,and then select the right path to realize the precise orientation.The advantage of the algorithm is that the high precision orientation can be realized even when there exists large errors,because the errors of the radio altimeter,barometric altimeter,digital map are totally considered.The amount of computation is reduced due to excluding the impossible path during flying.The simulation results show that the algorithm is accurate and reliable,which can make a valid calibration to the INS error.