Design of a Real-Time GPS Satellite Signal Simulator on the MULTISHARC Parallel Processing System

S. V. M. K. Prasad, V. Vaidehi, P. V. Ramakrishna, C. N. Krishnan, T. Ananda Sarangaram, G. Boopalan, N. Nagalakshmi, and S. Nappinnai

Peer Reviewed

Abstract: A GPS signal simulator is a versatile instrument used for testing and performance evaluation of a GPS receiver during its design and manufacture. A real-time GPS signal simulator (RTGPSSS) outputs the L1 signal of GPS satellites as received by the GPS receiver at its antenna. The generation of the GPS L1 signal for our design specification requires the transmission of a coarse acquisition (CA)-code, which is a pseudorandom noise (PRN) code at a rate of 1.023 Mchip/s, and the calculation of Doppler frequency at a rate of 19.55 s under high receiver dynamics. These critical timing requirements necessitate parallel processing techniques. In this paper, the design of a 12-channel RTGPSSS using a digital signal processor (DSP) – based parallel processing system is presented. The effects of receiver dynamics, receiver clock drift, multipath, and atmosphere anomalies (ionospheric and tropospheric delay) are also incorporated in the simulated GPS signal.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 50, Number 1
Pages: 57 - 64
Cite this article: Prasad, S. V. M. K., Vaidehi, V., Ramakrishna, P. V., Krishnan, C. N., Sarangaram, T. Ananda, Boopalan, G., Nagalakshmi, N., Nappinnai, S., "Design of a Real-Time GPS Satellite Signal Simulator on the MULTISHARC Parallel Processing System", NAVIGATION, Journal of The Institute of Navigation, Vol. 50, No. 1, Spring 2003, pp. 57-64.
Full Paper: ION Members/Non-Members: 1 Download Credit
Sign In