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�������պ����ѧѧ�� 2009, Vol. 35 Issue (5) :555-558    DOI:
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Design and implementation of IF signal modulator for GNSS signal simulator
Zhang Shuo, Kou Yanhong*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� Global navigation satellite system(GNSS) signal simulator can simulate satellite signals received by target receivers in high fidelity according to the signal structure, dynamics of the receiver and environmental parameters defined by users, which provides an effective way for both GNSS system-level simulation and receiver test. The research of GNSS IF signal generator and digital signal processing techniques of the simulator compatible with multi-systems and multiple carrier frequencies was mainly focused on. Approaches on digital signal synthesis, power control and accurate simulation of signal phase were proposed. Functions of communication with PC, calculation and updating of waveform controlling parameters, baseband signal modulation and generation of analog IF signal were implemented on the IF signal modulator based on the architecture of PCIE+DSP+FPGA+DAC. Test results from the corresponding GNSS receivers validate the accuracy and quality of signals generated by simulator.
Keywords�� global navigation satellite system   signal simulator   binary offset carrier modulation     
Received 2008-08-10;


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�� ˶, ���޺�.GNSSģ������Ƶ���ƿ������ʵ��[J]  �������պ����ѧѧ��, 2009,V35(5): 555-558
Zhang Shuo, Kou Yanhong.Design and implementation of IF signal modulator for GNSS signal simulator[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(5): 555-558
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