A Novel Acquisition Algorithm Based on PMF-apFFT for BOC Modulated Signals

Abstract

Large Doppler shifts are inherent to high-speed relative motion between receiver and satellite and are likely to cause major problems during the code phase acquisition due to the introduced frequency ambiguity. In order to solve the problem of acquisition for the binary offset carrier (BOC) modulated the signal with large Doppler shift, a novel acquisition algorithm based on partial matched filter-all phase fast Fourier transform (PMF-apFFT) is proposed in this paper. In this method, all phase processing was adopted to weaken the effect of spectrum leakage after partial correlation, and two dimensional parallel searching for Doppler frequency on different code phases was completed by the maximum value after the cumulative average exceeding the threshold. The theoretical analysis and simulation results show that the correct code phase search and high precision estimation of Doppler frequency can be completed by the proposed algorithm at the same time. Compared with the traditional PMF-FFT acquisition algorithm, the proposed algorithm has stronger anti-noise performance and a better detection probability, and it is suitable for the complex communication environment of strong noise and large Doppler shift.INDEX TERMS Partial matched filter-all phase fast Fourier transform (PMF-apFFT), binary offset carrier (BOC) signal, acquisition, large Doppler shift.

Acquisition of Time and Doppler Shift in WFRFT Encrypted Chaotic Direct Sequence Spread Spectrum System

“…According to (11), the maximum attenuation caused by the residual Doppler frequency shift is 0 6366 . , which is still a relatively large attenuation.…”

“…For the periodic direct sequence spread spectrum (DSSS) signal with Doppler frequency shift, the researchers achieve acquisition through the time-frequency twodimensional search and focus on improving detection performance or reducing computational complexity through different signal processing methods. The extended replica folding acquisition search technique [10] and the all-phase fast Fourier transform [11] were applied to improve detection performance. The compressed sensing theory [12] and the Doppler frequency estimation algorithms [13], [14] were applied to reduce the computational complexity.…”

A fine acquisition algorithm based on fast three-time FRFT for dynamic and weak GNSS signals

“…This poses a great challenge to the acquisition of GNSS signals, and most of the proposed acquisition algorithms [9−11] can only be used on the premise that the carrier frequency is completely eliminated. In order to solve the problem of acquisition in high dynamic environment, the algorithm combining partial matched filter (PMF) and fast Fourier transform (FFT) [12,13] is adopted to improve the range and resolution of Doppler shift estimation, but there is still no way to compensate the Doppler rate. A discriminator based on FFT was designed in [14], which can effectively estimate the residual of Doppler frequency in a quasi-static environment, but it is unable to deal with even small Doppler rate caused by acceleration.…”

Single-Phase Fault Line Selection in Distribution Network Based on Signal Injection Method

“…In sampling signal processing, all phase Fast Fourier Transform (APFFT) is adopted to solve the problem of spectrum leakage caused by non-integer sampling period. The spectrum of injection signal can be obtained completely [30]- [34]. The active power consumption of the injected signal in each line is used as the fault line selection criterion to improve the anti-interference ability.…”