Start acceleration of the space GPS receiver

Pavel Kovář

Abstract


The cold start of the space GPS receiver, i.e. the
start without any information about the receiver position, satellite
constellation, and time, is complicated by a large Doppler shift
of a navigation signal caused by the satellite movement on the
Earth orbit. That increases about five times the search space of
the navigation signals compared to the standard GPS receiver.
The paper investigates a method of the acceleration of the GPS
receiver cold start time designed for the pico- and femto-satellites.
The proposed method is based on a combination of the parallel
search in Doppler frequency and PRN codes and the serial search
in code phase delay. It can shorten the cold start time of the GPS
receiver operating on LEO orbit from about 300 to 60 seconds
while keeping the simplicity of FPGA signal processor and low
power consumption. The developed algorithm was successfully
implemented and tested in the piNAV GPS receiver. The energy
required for the obtaining of the position fix was reduced five
times from 36 on to 7.7 Joules. This improvement enables
applications of such receiver for the position determination in
smaller satellites like Pocket Cube or femto-satellites with a lower
energy budget than the Cube Satellite.


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References


O. Montenbruck, M. Garcia-Fernandez, and J. Williams. Performance

comparison of semicodeless GPS receivers for LEO satellites. GPS Solutions, 10(4):249–261, Mar. 2006.

J. Yuan, H. Jia, and Q. Fang. Application of GPS to space vehicles: analysis of space environment and errors. IEEE Aerospace and Electronic Systems Magazine, 13(1):25–30, 1998.

S. S. Arnold, R. Nuzzaci, and A. Gordon-Ross. Energy budgeting

for CubeSats with an integrated FPGA. In 2012 IEEE Aerospace

Conference. IEEE, Mar. 2012.

I. Ali, N. Al-Dhahir, and J.E. Hershey. Doppler characterization for

LEO satellites. IEEE Transactions on Communications, 46(3):309–313, Mar. 1998.

L. Sihver, S. Kodaira, I. Ambrozova, Y. Uchihori, and V. Shurshakov.

Radiation environment onboard spacecraft at LEO and in deep space.

In 2016 IEEE Aerospace Conference. IEEE, Mar. 2016.

T. Tsujii I. G. Petrovski. Digital Satellite Navigation and Geophysics.

Cambridge University Press, 2012.

E. D. Kaplan. Understanding GPS: Principles and Applications, Second

Edition. Artech House, 2005.

P. Kovar and S. Jelen. Cold start strategy of the CubeSat GPS receiver. Advances in Electrical and Computer Engineering, 14(2):29–34, 2014.

J. Walker. Performance data for a double-threshold detection radar. IEEE Transactions on Aerospace and Electronic Systems, AES-7(1):142–146, jan 1971.

S. Yuyao, W. Yongqing, C. Jingyao, and W. Siliang. High sensitivity

acquisition algorithm for DSSS signal with data modulation. China

Communications, 12(4):76–85, Apr. 2015.

D. J. R. van Nee and A. J. R. M. Coenen. New fast GPS code-acquisition technique using FFT. Electronics Letters, 27(2):158, 1991.

P. W. Ward. GPS receiver search techniques. In Proceedings of Position, Location and Navigation Symposium - PLANS 96. IEEE, 1996.

W. Zhang and M. Ghogho. Improved fast modified double-block zeropadding (fmdbzp) algorithm for weak gps signal acquisition. In 2010 18th European Signal Processing Conference, pages 1617–1621, Aug. 2010.


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