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.
Similar content being viewed by others
References
Ai G X, Shi H L, Wu H T, et al. The principal of the positioning system based on communication satellites. Sci China Ser G-Phys Mech Astron, 2009, 52(3): 472–488
Lu X C, Wu H T, Bian Y J, et al. Signal structure of the Chinese Area Positioning System. Sci China Ser G-Phys Mech Astron, 2009, 52(3): 412–422
Fridman A, Semenov S. Architectures of software GPS receivers. GPS Solut, 2000, 3(4): 58–64
Zarlink Semiconductor. GP4020 Data Sheet, http://www.zarlink.com
Phillip W W. GPS Receiver search techniques. In: Position Location and Navigation Symposium. New York: IEEE, 1996, 22(26). 604–611
Parkinson B W, Spilker J J. The Global Positioning System: Theory and Applications, Vol. I–II. Washington: American Institute of Aeronautics and Astronautics, 1996
Fredrik J, Rahman M, Jonas T, et al. GPS Satellite Signal Acquisition and Tracking. Division of Signal Processing. Sweden: Lulea University of Technology, 1998
Cahn C, Leimer D, Marsh C, et al. Software Implementation of a PRN spread spectrum receiver to accommodate dynamics. IEEE Trans Commun, 1997, 25(8): 832–840
Qiu Z H, Wang W Y. Understanding GPS Principles and Applications. Beijing: Publishing House of Electronics Industry, 2002. 75–132
Tsui J B-Y. Fundamentals of Global Positioning System Receivers. A Software Approach. 2nd ed. New Jersey: John Wiley & Sons, 2005. 324–346
Ai G X, Sheng P X, Du J L, et al. Barometric altimetry system as virtual constellation applied in CAPS. Sci China Ser G-Phys Mech Astron, 2009, 52(3): 376–383
Author information
Authors and Affiliations
Corresponding author
Additional information
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)
Rights and permissions
About this article
Cite this article
Hu, Y., Hua, Y., Hou, L. et al. Design and implementation of the CAPS receiver. Sci. China Ser. G-Phys. Mech. Astron. 52, 445–457 (2009). https://doi.org/10.1007/s11433-009-0056-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11433-009-0056-7