[an error occurred while processing this directive]
���¿��ټ��� �߼�����
   ��ҳ  �ڿ�����  ��ί��  Ͷ��ָ��  �ڿ�����  ��������  �� �� ��  ��ϵ����
�������պ����ѧѧ�� 2011, Vol. 37 Issue (3) :268-273    DOI:
���� ����Ŀ¼ | ����Ŀ¼ | ������� | �߼����� << | >>
����, �غ���, ����*
�������պ����ѧ ������Ϣ����ѧԺ, ���� 100191
Threshold setting method for GPS signal acquisition under cross-correlation effect
Liu Yang, Qin Honglei, Jin Tian*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Download: PDF (1KB)   HTML 1KB   Export: BibTeX or EndNote (RIS)      Supporting Info
ժҪ ��ͳGPS�����źŲ��������趨�����ڻ���ظ�������´��ڽϴ��龯����,�����޷��������ź�.��Ը�������з���,�ڴ˻��������һ����Զ��������ͬ����ͬʱ��������µ��źż��ģ�ͺ͸���ģ��.�źż��ģ������ػ��ַ�����ۼӻ���������˫���޶�μ��,�����ڿ���������ͬʱҲ�����˻���ظ��Ŷ����źŲ����Ӱ��,�����ģ��Ϊ������χ2�ֲ�.��ԭ�еĺ��龯���޼�ⷽ��������,�������ǿ�źŻ���ظ��Ŷ�΢���źż��Ӱ������µ����޼��㷽����Ϊ�µ���������,����ԭ�е����޼��㷽����Ϊ���޵�����.�ڴ˻��������ǿ���������źŹ���ʱ�ļ��˼·,�������������޼��ǿ�źŲ����л���ظ�����������,�������������ж��Ƿ������źŴ���.���÷������ݺ�ʵ��������Կ��ǻ���ظ��ŵ��������޽���ʵ��,����ԭ�����޷������бȽ�,֤����ǿ�����źŹ��������ԭ�������޷����������ź�,���µ������趨����������������,�����нϸߵļ����ʺͽϵ͵��龯����.
Email Alert
�ؼ����� ΢���źŲ���   Զ��ЧӦ   ���龯׼��   �����趨     
Abstract�� Traditional global positioning system(GPS) signal acquisition threshold method suffers from large false alarm ratio in the condition of cross correlation interference, and thus influences weak signal acquisition. This problem was analyzed and signal acquisition detector was improved under the situation of more than one satellites existing with different signal power. Double threshold multiple detection algorithm was introduced based on the coherent correlation and non-coherent accumulation. The statistical model is non-central chi-square distributed due to cross correlation influence. A threshold calculation method was put up in the weak signal detection based on the original fixed false alarm criterion, and this threshold was considered to be the upper threshold. The original threshold was considered to be the lower threshold. An algorithm was put up considering both strong and weak signal coexistence, strong signals were acquired first and then cross correlation interference was eliminated, weak signals were acquired after that. Simulated and real data have been used to test the upper threshold, results were compared with the original method. It is proved that original method can-t detect satellite signals while new threshold works efficiently with high detection possibility and low false alarm ratio.
Keywords�� weak signal acquisition   near-far problem   constant false alarm rate   threshold setting     
Received 2010-01-20;


About author: �� ��(1983-),Ů,���ɹż�����,��ʿ��,mickeybaby2003@163.com.
����, �غ���, ����.���ǻ���ظ��ŵ�GPS�źŲ��������趨����[J]  �������պ����ѧѧ��, 2011,V37(3): 268-273
Liu Yang, Qin Honglei, Jin Tian.Threshold setting method for GPS signal acquisition under cross-correlation effect[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(3): 268-273
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2011/V37/I3/268
Copyright 2010 by �������պ����ѧѧ��