ժҪ ����������������ʽֵ��5����GDOP(Geometry Dilution of Precision)ֵ�Ĺ�ϵ,���ɴ������һ������˫����������Ͻ��ջ�(��GPS(Global Position System)��BD2(BeiDou2)��Ͻ��ջ�)�е�ѡ���㷨——�����ѡ��.�÷�������ѡ������ʽ����ֵ���ļ������,Ȼ�������Ҫ��ÿ����ϴ�����ɼ�����ѡ������������,������GDOP��Сԭ����⼸�������ѡȡ���ս��.�������������ʾ�÷�����ֱ������GDOPѡ�����,95�����ϵ�GDOP��Ա�ֵС��5��,����������С40������.
On the basis of the relationship between the determinant of a 5×5 matrix and five satellites- geometry dilution of precision(GDOP), a method of selecting satellites for double constellation combined receiver (e.g. GPS(global position system) and BD2(BeiDou2) combined receiver) was proposed. With this algorithm, firstly several combinations of the maximal determinant were computed, then some optimal satellites from other visible satellites for each combination were chosen according to need, lastly according to the least GDOP principle the final result was selected from previous combinations. Computer simulations indicate that compared to directly using GDOP to select satellites, more than 95% of relative ratio are lower than 5%, while computation burden reduces more than 40% with this method.