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Content Provider | IET Digital Library |
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Author | Fan, Bo Zhang, Kai Qin, Yuliang Wang, Hongqiang Xiao, Huaitie |
Abstract | For the acquisition of weak global positioning system L5 signals in high dynamic environments, coherent integration time is necessarily extended for signal-to-noise ratio improvement. However, the incidental problems, such as high-rate sign transitions, tiered codes and particularly the concurrence of Doppler shift and Doppler rate, will bring challenges to the acquisition. This study proposes a novel acquisition algorithm based on the discrete chirp-Fourier transform (DCFT) to solve the problems above. The 1 ms complex correlation is modelled as a chirp signal to account for high dynamics effect. Then the DCFT is introduced to simultaneously estimate the Doppler shift and Doppler rate residuals. In this way, the 1 ms complex correlations are coherently post-integrated and a high processing gain can be obtained when both the primary and secondary code phases are aligned. Furthermore, the false alarm and detection probabilities are derived to statistically characterise the acquisition performance. Simulation results demonstrate that the proposed algorithm is tolerant of high dynamics and robust to noise. Specifically, it can acquire the L5 signal with up to 20 g acceleration and only 25 dB Hz carrier-to-noise ratio, which is impossible for the conventional fast Fourier transform scheme. |
Starting Page | 736 |
Ending Page | 746 |
Page Count | 11 |
ISSN | 17518784 |
Volume Number | 7 |
e-ISSN | 17518792 |
Issue Number | Issue 7, Aug (2013) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rsn/7/7 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2012.0249 |
Journal | IET Radar, Sonar & Navigation |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | Carrier-to-noise Ratio Chirp Signal Coherent Integration Time Complex Correlation Correlation Method Detection Probabilities Discrete Chirp-Fourier Transform-based Acquisition Discrete Fourier Transform Doppler Rate Doppler Shift False Alarm Global Positioning System High Dynamic Environments High Processing Gain High-rate Sign Transitions Integral Transforms Primary Code Phase Radio Navigation And Direction Finding Satellite Communication System Secondary Code Phase Signal Detection Signal Processing Theory Signal to Noise Ratio Tiered Code Weak Global Positioning System L5 Signal |
Content Type | Text |
Resource Type | Article |
Subject | Electrical and Electronic Engineering |
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