Design and implementation of the CAPS receiver |
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Authors: | YongHui Hu Yu Hua Lei Hou JingFa Wei and JianFeng Wu |
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Institution: | (1) National Time Service Center, Chinese Academy of Sciences, Xi’an, 710600, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, China |
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Abstract: | In this paper, based on analyses of the Chinese Area Positioning System (CAPS) satellite (GEO satellite) resources and signal
properties, the signal power at the port of the receiver antenna is estimated, and the implementation projects are presented
for a switching band C to band L CAPS C/A code receiver integrated with GPS receiver suite and for a CAPS dual frequency P
code receiver. A microstrip receiving antenna is designed with high sensitivity and wide beam orientation, the RF front end
of the C/A code and P code receivers, and a processor is designed for the navigation baseband. A single frequency CAPS C/A
code receiver and a CAPS dual frequency P code receiver are built at the same time. A software process flow is provided, and
research on relatively key techniques is also conducted, such as signal searching, code loop and carrier loop algorithms,
a height assistant algorithm, a dual frequency difference speed measurement technique, a speed measurement technique using
a single frequency source with frequency assistance, and a CAPS time correcting algorithm, according to the design frame of
the receiver hardware. Research results show that the static plane positioning accuracy of the CAPS C/A code receiver is 20.5–24.6
m, height accuracy is 1.2–12.8 m, speed measurement accuracy is 0.13–0.3 m/s, dynamic plane positioning accuracy is 24.4 m,
height accuracy is 3.0 m, and speed measurement accuracy is 0.24 m/s. In the case of C/A code, the timing accuracy is 200
ns, and it is also shown that the positioning accuracy of the CAPS precise code receiver (1 σ) is 5 m from south to north,
and 0.8 m from east to west. Finally, research on positioning accuracy is also conducted.
Supported by the Knowledge Innovation Program of Major Projects, Chinese Academy of Sciences (Grant No. KGCX1-21) and the
National High Technology Research and Development Program of China (Grant No. 2004AA105030) |
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Keywords: | CAPS receiver hardware key algorithm |
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