|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||364/434 ; 364/459 ; 244/164|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 21 인용 특허 : 12|
Disclosed is a method and apparatus estimating yaw error and roll and yaw disturbance torques from measured roll error and yaw momentum on a continuous on-orbit basis in an orbiting satellite. The information thus obtained can be used to continuously correct for the yaw error by means of, for example, activating a magnetic torquer. Two control loops are used in this invention, a fast loop to damp nutations by changing momentum wheel speed, and a slow loop of the Luenberger observer variety. The latter is a yaw error correction loop which also serves to u...
In an orbiting satellite having a stored momentum system for stabilizing the attitude of the satellite about orthogonal roll, pitch, and yaw axes, apparatus for estimating and directly correcting yaw error, said apparatus comprising: at least one momentum wheel having a component of momentum about the yaw axis; means situated on board the satellite for measuring the angular error of the satellite body with respect to the roll axis, said means generating a signal corresponding to said roll error; coupled to said roll error measuring means and to said mome...