Spoofing Detection in GNSS Receivers through Cross-Ambiguity Function Monitoring

2019 ◽  
Author(s):  
Christopher Hegarty ◽  
Brady O’Hanlon ◽  
Ali Odeh ◽  
Karl Shallberg ◽  
John Flake
Keyword(s):  
Ambiguity Function ◽  
Spoofing Detection ◽  
Gnss Receivers ◽  
Cross Ambiguity Function

Underwater TDOA/FDOA joint localisation method based on cross‐ambiguity function

2020 ◽  
Vol 14 (8) ◽  
pp. 1256-1266
Author(s):  
Feng Jiang ◽  
Zhenkai Zhang ◽  
Hamid Esmaeili Najafabadi ◽  
Yi Yang
Keyword(s):  
Ambiguity Function ◽  
Cross Ambiguity Function

scholarly journals Improved ASM-TER Training Sequence Detection and Fine Doppler Frequency Estimation Methods from a Satellite

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Peixin Zhang ◽  
Jianxin Wang ◽  
Peng Ren ◽  
Shushu Yang ◽  
Haiwei Song
Keyword(s):  
Computational Complexity ◽  
Frequency Estimation ◽  
Doppler Frequency ◽  
Training Sequence ◽  
Ambiguity Function ◽  
Estimation Methods ◽  
Dc Algorithm ◽  
Doppler Frequency Estimation ◽  
Simulation Results ◽  
Cross Ambiguity Function

To detect terrestrial application-specific messages (ASM-TER) signals from a satellite, a novel detection method based on the fast computation of the cross ambiguity function is proposed in this paper. The classic cross ambiguity function’s computational burden is heavy, and we transform the classic cross ambiguity function to a frequency domain version to reduce the computational complexity according to Parseval’s theorem. The computationally efficient sliding discrete Fourier transform (SDFT) is utilized to calculate the frequency spectrum of the windowed received signal, from which the Doppler frequency could be estimated coarsely. Those subbands around the Doppler frequency are selected to calculate the ambiguity function for reducing the computational complexity. Furthermore, two local sequences with half length of the training sequence are utilized to acquire a better Doppler frequency tolerance; thus, the frequency search step is increased and the computational complexity could be further reduced. Once an ASM-TER signal is detected by the proposed algorithm, a fine Doppler frequency estimation could be obtained easily from the correlation peaks of the two local sequences. Simulation results show that the proposed algorithm shares almost the same performance with the classic cross ambiguity function-based method, and the computational complexity is greatly reduced. Simulation results also show that the proposed algorithm is more resistant to cochannel interference (CCI) than the differential correlation (DC) algorithm, and the performance of fine Doppler frequency estimation is close to that of the Cramér–Rao lower bound (CRLB).

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