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�������պ����ѧѧ�� 2009, Vol. 35 Issue (9) :1130-1133    DOI:
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���������ٽ���������GPSģ����
������, ŷ����, Ԭ�˱�*
�й���ѧԺ��������������о��� ������ز����ص�ʵ����, �人 430077
Rapid resolution of GPS ambiguities of satellite formation flying with two-step method
Wang Haitao, Ou Jikun, Yuan Yunbin*
Key Laboratory of Dynamic Geodesy, Institute of Geodesy & Geophysics of CAS, Wuhan 430077, China

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ժҪ Ϊ�˷����DZ�ӷ���ʵʱ��Զ�λ��˫Ƶģ���Ƚ����ٶ�����ȱ��,�����չKalman�˲�(EKF,Extended Kalman Filter),���Ȳ�����������Ԫ(��10��)��λƽ��α����Զ�λ����� ��L6����ƽ��ֵ���˲���ʼ��,�ٸ�������������˫Ƶģ����,���Ƚ��㲢��ȷ�̶�����ģ����,��ý�׼ȷ�Ļ��߷�����ֵ,Ȼ�����ѡȨ��Ϸ���,�����߷�����ΪԼ���������㲢�̶�˫Ƶģ����.������������������,������ģ������ȷ�̶���,������Ǽ���Զ�λ�����5��cm����,�����������ڽ϶�ʱ��(Լ3��min)�ڹ̶�˫Ƶģ����,Ϊ��ȷ���������ǵ����״̬�ṩ����.
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�ؼ����� ���DZ�ӷ���   GPSģ����   ��λƽ��α��   ��չKalman�˲�   ѡȨ���     
Abstract�� In order to rapidly resolve the carrier ambiguities of satellite formation flying, a two-step method combined with extended Kalman filter (EKF) was proposed. The first step is to fix the wide-lane ambiguities during the state estimation after initializing the filtering with carrier-smoothed-code algorithm and mean value of ��L6��. The second step is to calculate the float double-frequency ambiguities with the method of selecting the parameter weights using the baseline component as a constraint. The simulated case reveales that the baseline accuracy is within 5��cm after the wide-lane ambiguity was solved and the proposed method can correctly resolve the ambiguities within 3 minutes after the filtering initialization with 10 epochs observation.
Keywords�� satellite formation flying   global position system(GPS) ambiguity   wide-lane combination   extended Kalman filter   selection of the parameter weights     
Received 2008-09-10;
Fund:

������Ȼ��ѧ����������Ŀ(40674012);����863�ƻ�������Ŀ(2007AA12Z305, 2007AA12Z311)

About author: ������(1979-),��,ɽ��������,��ʿ��,whigg_wang@hotmail.com.
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������, ŷ����, Ԭ�˱�.���������ٽ���������GPSģ����[J]  �������պ����ѧѧ��, 2009,V35(9): 1130-1133
Wang Haitao, Ou Jikun, Yuan Yunbin.Rapid resolution of GPS ambiguities of satellite formation flying with two-step method[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(9): 1130-1133
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