Non-coherent, differentially coherent and quasi-coherent integration on GNSS pilot signal acquisition or assisted acquisition

Qiu, Jianning; Qian, Yi; Zheng, Rui

doi:10.1109/plans.2012.6236840

Cited by 5 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Table 1, M FFT and A FFT are respectively the multiplications and addition computation of FFT according to Cooley-Tukey algorithm. M S and A S are the multiplications and addition computation respectively in the proposed visible satellite's phase and frequency identification method, which maximum and minimum value can be computed as follows: (11) where N Bv is the number of visible BeiDou satellites that are combined to search simultaneously. These four values in Eq.…”

Section: The Phase and Frequency Identification For Individual Visiblmentioning

confidence: 99%

A simultaneous multiple BeiDou signal acquisition algorithm for a software-based GNSS receiver

Xie

Liu

et al. 2016

Optik

View full text Add to dashboard Cite

The time needed for a Global Navigation Satellite System (GNSS) receiver to acquire satellite signals is one of the key parameters to assess the performance of a receiver. This presents a challenge for a software receiver in which more frequency bins and satellite codes are required to search using conventional meth-ods. In order to speed up the acquisition process of the BeiDou software receiver in a cold start, this paper proposes a simultaneous multiple Code Division Multiple Access (CDMA) signal acquisition algorithm. The time for searching satellites is reduced by constructing new local codes to enable the capability of detecting the presence of multiple BeiDou satellites. Besides, the individual phase identification approach for each visible satellite is further presented with multiple satellites acquisition. So a search within the PRNs used for the generation of local combined code is performed. Finally, the test results show that the proposed acquisition algorithm can effectively detect multiple BeiDou satellites simultaneously. In addition, the test results show that signal acquisition time can be reduced by 8.7% to 24.1% depending on different combination numbers and different numbers of visible satellites in the combination list.

show abstract

Section: The Phase and Frequency Identification For Individual Visiblmentioning

confidence: 99%

A simultaneous multiple BeiDou signal acquisition algorithm for a software-based GNSS receiver

Xie

Liu

et al. 2016

Optik

View full text Add to dashboard Cite

show abstract

“…As such, tracking loop-based TOA estimation can be easily destabilized. In general, noncoherent accumulation can be used to improve the acquisition sensitivity and parameter estimation accuracy of localization systems in weak signal environments [28]. Therefore, non-coherent accumulation-based methods can be considered to simultaneously overcome the challenges of signal multipath propagation and signal power attenuation.…”

Section: Introductionmentioning

confidence: 99%

Utilization of non-coherent accumulation for LTE TOA estimation in weak LOS signal environments

Tian,

Fangchi,

Yafei

et al. 2023

J Wireless Com Network

View full text Add to dashboard Cite

Ground localization systems based on cellular signals are vulnerable to the hazards of signal power attenuation and multipath propagation in urban environments. Non-coherent accumulation is an effective solution to this problem, but its application to cellular localization systems has not been properly discussed. In this paper, we propose two cellular time-of-arrival (TOA) estimation methods based on non-coherent accumulation: the “TOA estimation algorithm based on non-coherent accumulation of the channel impulse response” (nch-CIR) in the time domain and the “Super Resolution TOA Estimation Algorithm based on non-coherent accumulation of the covariance matrix” (nch-SRA) in the frequency domain. Among these two methods, the nch-CIR algorithm has a lower computational cost and better anti-noise performance, and the nch-SRA algorithm has better performance in terms of multipath delay estimation. Through theoretical analysis and extensive simulations, we also discuss the influence of mobility on these two methods. In addition, experiments are conducted to evaluate the performance of the proposed method using real collected cellular signals. The results show that both nch-CIR and nch-SRA can achieve a better performance compared with the conventional methods.

show abstract

“…While considering the high efficiency of FFT, the FFT-based parallel search algorithm is widely accepted in the currently used acquisition methods [18]. Besides, non-coherent (NCH) integration and differentially coherent (DFC) integration are useful methods for weak signal acquisition [19][20][21][22]. The sensitivity of acquisition will be improved by extending the coherent integration length.…”

Section: Introductionmentioning

confidence: 99%

A BeiDou Signal Acquisition Approach Using Variable Length Data Accumulation Based on Signal Delay and Multiplication

Yang

Wang

et al. 2020

Sensors

View full text Add to dashboard Cite

The secondary modulation with the Neumann-Hoffman code increases the possibility of bit sign transition. Unlike other GNSS signals, there is no pilot component for synchronization in BeiDou B1/B3 signals, which increases the complexity in acquisition. A previous study has shown that the delay and multiplication (DAM) method is able to eliminate the bit sign transition problem, but it only applies to pretty strong signals. In this paper, a DAM-based BeiDou signal acquisition approach, called variable length data accumulation (VLDA), is proposed to acquire weak satellite signals. Firstly, the performance of DAM method versus the different delays is analyzed. The DAM operation not only eliminates bit sign transition, but it also increases noise power. Secondly, long-term signal is periodically accumulated to improve signal intensity in order to acquire weak signals. While considering the Doppler frequency shift of ranging codes, the signal length must be compensated before accumulating long-term signal. Finally, the fast-Fourier-transform based parallel code phase algorithm are used for acquisition. The simulation results indicate that the proposed VLDA method has better acquisition sensitivity than traditional non-coherent integration method under the same calculation amount. The VLDA method only requires approximately 27.5% of calculations to achieve the same acquisition sensitivity (35 dBHz). What is more, the actual experimental results verify the feasibility of the VLDA method. It can be concluded that the proposed approach is an effective and feasible method for solving the bit sign transition problem.

show abstract

Non-coherent, differentially coherent and quasi-coherent integration on GNSS pilot signal acquisition or assisted acquisition

Cited by 5 publications

References 4 publications

A simultaneous multiple BeiDou signal acquisition algorithm for a software-based GNSS receiver

A simultaneous multiple BeiDou signal acquisition algorithm for a software-based GNSS receiver

Utilization of non-coherent accumulation for LTE TOA estimation in weak LOS signal environments

A BeiDou Signal Acquisition Approach Using Variable Length Data Accumulation Based on Signal Delay and Multiplication

Contact Info

Product

Resources

About