Fast acquisition implementation for high sensitivity global positioning systems receivers based on joint and reduced space search

Sagiraju, Phani K.; Raju, G.V.S.; Akopian, David

doi:10.1049/iet-rsn:20070147

Cited by 26 publications

(16 citation statements)

References 3 publications

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“…If d = 0, the multiple delays based estimation is simplified to be based on single delay. Just like the direct FFT based acquisition algorithms to reduce the complexity of computing the correlation [4], the whole sequence of (5) can be realized by M -point FFT/IFFT (M = 2N + 2) for higher computational efficiency.…”

Section: A Joint Code Acquisition and Doppler Estimationmentioning

confidence: 99%

“…Acquisition time was shortened through increasing the hardware costs. Alternative technique based on the fast Fourier transform (FFT) in the frequency domain have been extensively studied for fast code acquisition [4]. FFT was used to compute the correlations for all the code phases at one candidate Doppler frequency, so that the average acquisition time was reduced.…”

Section: Introductionmentioning

confidence: 99%

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Joint Code Acquisition and Doppler Frequency Shift Estimation for GPS Signals

Dai

Hanzo

Wang

et al. 2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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The unavoidable Doppler frequency shift reduces the correlation peak for code acquisition in global positioning system (GPS). In contrast to conventional methods where the code phase and Doppler frequency shift are separately treated, this paper proposes a novel three-step scheme for joint code acquisition and Doppler estimation, whereby not only the Doppler effect on the correlation peak is removed, but also the reduced detection probability due to noise enhancement in low signal-to-noise ratio (SNR) environments is avoided. The theoretical analysis shows that the proposed method has low complexity and fast acquisition speed. Computer simulations demonstrate that code acquisition with high detection probability and Doppler frequency shift estimation with high accuracy can be simultaneously achieved.

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Section: A Joint Code Acquisition and Doppler Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Joint Code Acquisition and Doppler Frequency Shift Estimation for GPS Signals

Dai

Hanzo

Wang

et al. 2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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“…Tsui (2000) and Borre et al (2007) discussed suitable GNSS signal processing algorithms for software receivers. Suitable algorithms for GNSS signal acquisition can be found in Sagiraju et al (2008) and Juang and Chen (2010). In a software receiver, the correlation operation is the most demanding task, and a bit-wise parallel method was proposed by Ledvina et al (2004a) to improve the efficiency of this.…”

Section: R E L At E D W O R Kmentioning

confidence: 99%

Development of a PC-Based Software Receiver for the Reception of Beidou Navigation Satellite Signals

2013

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Beidou is the Global Navigation Satellite System (GNSS) being developed in China, with the aim to provide a global navigation service that is similar to the Global Positioning System (GPS) and Galileo navigation systems. In this paper, it is demonstrated that through the flexibility and re-configurability of a PC-based software receiver in which the baseband operations are realized in terms of software, it is possible to acquire, track, and demodulate Beidou satellite signals even when only a limited amount of information is known. Further, with the Beidou interface control document now available, the proposed PC-based software receiver can be easily adapted to perform navigation functions. This research lays the foundation for the further development of navigation receivers and exploration of multi-GNSS applications.

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“…Among different methods, there is the basic serial search (SS) [16], there are one-dimensional parallel searches such as the parallel frequency search (PFS) and the PCS [16], [17,Chap. 2], and there are two-dimensional parallel searches such as the DBZP method [11,12] (which is an extension of the PFS) or the methods proposed in [18,19]. The parallel code search method seems to be among the most attractive methods for the acquisition of modern signals, because it can compensate the code Doppler (especially important with signals having a high chipping rate and with weak signals requiring a long integration) whereas some other methods (such as those based on the PFS) cannot compensate it [20], and onedimensional parallel methods are less complex to implement than two-dimensional parallel methods.…”

Section: Problem and Current Solutionsmentioning

confidence: 99%

FFT Splitting for Improved FPGA-Based Acquisition of GNSS Signals

Leclère

Botteron

Landry

et al. 2015

International Journal of Navigation and Observation

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With modern global navigation satellite system (GNSS) signals, the FFT-based parallel code search acquisition must handle the frequent sign transitions due to the data or the secondary code. There is a straightforward solution to this problem, which consists in doubling the length of the FFTs, leading to a significant increase of the complexity. The authors already proposed a method to reduce the complexity without impairing the probability of detection. In particular, this led to a 50% memory reduction for an FPGA implementation. In this paper, the authors propose another approach, namely, the splitting of a large FFT into three or five smaller FFTs, providing better performances and higher flexibility. For an FPGA implementation, compared to the previously proposed approach, at the expense of a slight increase of the logic and multiplier resources, the splitting into three and five allows, respectively, a reduction of 40% and 64% of the memory, and of 25% and 37.5% of the processing time. Moreover, with the splitting into three FFTs, the algorithm is applicable for sampling frequencies up to 24.576 MHz for L5 band signals, against 21.846 MHz with the previously proposed algorithm. The algorithm is applied here to the GPS L5 and Galileo E5a, E5b, and E1 signals.

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Fast acquisition implementation for high sensitivity global positioning systems receivers based on joint and reduced space search

Cited by 26 publications

References 3 publications

Joint Code Acquisition and Doppler Frequency Shift Estimation for GPS Signals

Joint Code Acquisition and Doppler Frequency Shift Estimation for GPS Signals

Development of a PC-Based Software Receiver for the Reception of Beidou Navigation Satellite Signals

FFT Splitting for Improved FPGA-Based Acquisition of GNSS Signals

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