Abstract: Landmark sensor acquires satellite attitude information from the remote sensing (images) by calculating the object movement between real-time images and template images and(thereon) computing the satellite attitude.The general scheme of landmark sensor is designed,in which image matching is the key technique.A coarse-to-fine image matching algorithm based on(image) regional features is proposed.The attainable precision of attitude acquisition is analyzed(theoretically),and the result shows that high-precision satellite attitude information can be(achieved) by the landmark sensor,which is of great value as a novel optical attitude sensor.