Mitigation of Multipath Effects Based on a Robust Fractional Order Bidirectional Least Mean Square (FOBLMS) Beamforming Algorithm for GPS Receivers

Siridhara, A L; Ratnam, D. Venkata

doi:10.1007/s11277-020-07071-1

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…The estimation of multipath code delay in the urban scenario is carried out by Kumar and Singh [44] used a double differentiated correlation function-based histogram approach. The beamforming technique using bidirectional least mean squared algorithm is also used in GPS receivers to minimize the multipath effects implemented by Siridhara and Ratnam [45].…”

Section: Related Workmentioning

confidence: 99%

A new multipath channel estimation and mitigation using annihilation filter combined tracking loop implementation in software GPS receivers

Elango

Landry

2022

Meas. Sci. Technol.

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The multipath effect causes severe degradation in the positioning of commercial GPS receivers. Due to multipath error, the positioning accuracy could reach a few 10 meters. If the cumulative Multipath delay is less than 0.1-0.35 chips, then it is difficult to mitigate in GPS receivers. This causes severe degradation in GPS signals and can cause a measurement bias. To alleviate this problem, the estimation of multipath parameters using annihilating filter and its mitigation in the GPS tracking loop is proposed in this work. The estimation of randomly generated multipath signals can be performed in the receiver with a lower sampling rate when compared to the larger bandwidth of the GPS baseband signal. Here, the frequency components of the Multipath signal in superimposed complex exponentials have been transformed from the time delay and the amplitude of the path observables. The Rayleigh fading model in the urban scenario has been simulated in which the amplitude and the phase of the number of paths (i.e., the frequency component of superimposed complex exponentials) are set and this fading signal is convolved with GPS signal that forms the multipath faded signal. In the GPS receiver post-processing stage, with the help of the annihilation filter, the multipath components are estimated, then an inverse/adaptive filter and compensation technique are further applied to mitigate the multipath component. The mean square error with the different number of paths with noisy environments is analyzed utilizing the cadzaw denoising algorithm. The simulation results of the proposed technique employed in the tracking module of the software GPS receiver under severe multipath conditions indicate a substantial enhancement in the performance of the GPS receiver with minimal code and carrier phase error when compared to the least squares and adaptive blind equalization channel techniques. Moreover, the positioning accuracy is also calculated with the inclusion of multipath components in two satellites out of six satellites used in the simulation, the results showed that the annihilation filter improved the mean position accuracy up to 9.3023 meters.

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Section: Related Workmentioning

confidence: 99%

A new multipath channel estimation and mitigation using annihilation filter combined tracking loop implementation in software GPS receivers

Elango

Landry

2022

Meas. Sci. Technol.

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Fractional-Order Water Flow Optimizer

Tang,

Wang,

Zang

et al. 2024

Int J Comput Intell Syst

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The water flow optimizer (WFO) is the latest swarm intelligence algorithm inspired by the shape of water flow. Its advantages of simplicity, efficiency, and robust performance have motivated us to further enhance it. In this paper, we introduce fractional-order (FO) technology with memory properties into the WFO, called fractional-order water flow optimizer (FOWFO). To verify the superior performance and practicality of FOWFO, we conducted comparisons with nine state-of-the-art algorithms on benchmark functions from the IEEE Congress on Evolutionary Computation 2017 (CEC2017) and four real-world optimization problems with large dimensions. Additionally, tuning adjustments were made for two crucial parameters within the fractional-order framework. Finally, an analysis was performed on the balance between exploration and exploitation within FOWFO and its algorithm complexity.

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Quality assessment of Continuous Operating Reference Stations (CORS) - GPS stations in Mexico

Hernández-Andrade

Romero-Andrade

Sharma

et al. 2022

Geodesy and Geodynamics

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Mitigation of Multipath Effects Based on a Robust Fractional Order Bidirectional Least Mean Square (FOBLMS) Beamforming Algorithm for GPS Receivers

Cited by 4 publications

References 24 publications

A new multipath channel estimation and mitigation using annihilation filter combined tracking loop implementation in software GPS receivers

A new multipath channel estimation and mitigation using annihilation filter combined tracking loop implementation in software GPS receivers

Fractional-Order Water Flow Optimizer

Quality assessment of Continuous Operating Reference Stations (CORS) - GPS stations in Mexico

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