Abstract
This article investigates multicarrier (MC) transmission for next-generation global positioning system (GPS) instead of current spread spectrum signals. A MC code is proposed in this article as an alternative to the coarse/acquisition (C/A) code in GPS. The entire GPS bandwidth for the C/A code is divided into 1 ,024 subcarrier slots. As per our proposed arrangement, each satellite vehicle (SV) takes up only 42 uniformly spaced and non-overlapping subcarrier slots while approximately occupying the same bandwidth as the C/A code in GPS. In this way, the proposed MC code is proved to attain a 4 .73 dB SNR gain compared to the GPS C/A code in terms of Cramer-Rao lower bound for range estimation, which could evidently enhance the GPS receiver's sensitivity. Together with the feature of robustness against multipath effect, the proposed MC code is helpful for urban, tunnel, even indoor and underground positioning. The transmission and reception of the propose MC code is also described, where the range estimation process is explained. Furthermore, the proposed MC code is shown to be robust against narrow band interference. Moreover, the probability of collision between SVs due to Doppler shifts is theoretically analyzed, where the probability of successful positioning is evaluated. Simulation Results show a consistency with our proposed theory.
Highlights
Global navigation satellite system (GNSS) such as the current global positioning system (GPS) or the future European Galileo system can provide a worldwide accurate positioning under an outdoor good environmental conditions [1]
8 Conclusion and future work The unfiltered MC modulation has been proposed as an alternative for the GPS C/A code in this article
The proposed MC code was shown to attain a 4.73 dB SNR gain in terms of range estimation compared to the current C/A code
Summary
Global navigation satellite system (GNSS) such as the current global positioning system (GPS) or the future European Galileo system can provide a worldwide accurate positioning under an outdoor good environmental conditions [1]. Under the assumptionc that there are currently 24 SVs in GPS, each SV takes up only 42 uniformly spaced and non-overlapping subcarrier slots as per our proposed arrangement while approximately occupying the whole bandwidth In this way,d the proposed MC code is proved to attain a 4.73 dB improvement (See Section 3) to that of the C/A code in terms of ranging accuracy. From another viewpoint, for a fixed ranging accuracy, the difference of the required SNR between the proposed design and the C/A code is obtained as. FSAD, kHz 7.5 [11.5, 12.5] [2.8, 5.3] [5.7, 6.6] [12.6, 13.1] [7.2, 7.4] [7.3, 7.4] [10.5, 12.0] [2.7, 5.3] [7.1, 7.3] [11.6, 12.6] [6.8, 7.2] [7.2, 7.3] [11.0, 12.3] [2.6, 5.2] [7.1, 7.3] [11.2, 12.4] [7.1, 7.3] [7.1, 7.3] [11.2, 12.4] [2.6, 5.2] [7.1, 7.3] [11.0, 12.3] [7.2, 7.3] [6.8, 7.2] [11.6, 12.6] [2.7, 5.3] [7.1, 7.3] [10.5, 12.0] [7.3, 7.4] [7.2, 7.4] [12.6, 13.1] [2.8, 5.3] [5.7, 6.6] [11.5, 12.5] 7.5
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