Low Computational Signal Acquisition for GNSS Receivers Using a Resampling Strategy and Variable Circular Correlation Time

In order to improve acquisition speed and carrier frequency accuracy, a fast algorithm to acquire GPS signal is proposed. Signal-to-Noise Ratio is improved by coherent integration and non-coherent integration. The advantages of serial sliding algorithm and circular correlation algorithm are combined to achieve high carrier frequency accuracy. Removing the information of C/A code makes serial search from two-dimensional to one-dimensional to achieve less computation. Simulation shows weak signal of-30dB S/N is successfully acquired. The error of carrier frequency is controlled within 50Hz. So the data processing efficiency for the tracking loop is greatly increased.

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Combined algorithm for interference suppression and signal acquisition in GNSS receivers

Electronics Letters ◽

10.1049/el.2016.4297 ◽

2017 ◽

Vol 53 (4) ◽

pp. 274-275 ◽

Cited By ~ 5

Author(s):

Feiqiang Chen ◽

Junwei Nie ◽

Shaojie Ni ◽

Zhengrong Li ◽

Feixue Wang

Keyword(s):

Interference Suppression ◽

Signal Acquisition ◽

Gnss Receivers ◽

Combined Algorithm

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New Approach of High Sensitivity Techniques Using Collective Detection Method with Multiple GNSS Receivers

Sensors ◽

10.3390/s18113690 ◽

2018 ◽

Vol 18 (11) ◽

pp. 3690 ◽

Cited By ~ 1

Author(s):

Maherizo Andrianarison ◽

René Landry

Keyword(s):

High Sensitivity ◽

Optimization Method ◽

Reference Station ◽

Signal Acquisition ◽

Knowing That ◽

Collective Detection ◽

Positioning Method ◽

Gnss Receivers ◽

Comparison Of The Results ◽

Acquisition Method

The Collective Detection (CD) technique is a promising approach to meet the requirements for signal acquisition in GNSS-harsh environments. The CD approach has been proposed because of its potential to operate as both a direct positioning method and a high-sensitivity acquisition method. This paper is dedicated to the development of a new CD architecture for processing satellite signals in challenging environments. It proposes the best signal acquisition method used according to the reception conditions of the different receivers that can assist the user in difficulty. Knowing that the CD approach is beneficial in the case where the maximum of satellite signals can be combined, the proposed approach consists in choosing the best receiver(s) from several connected receivers to serve as a reference station, as smart cooperative navigation concept. New metrics of the CD with optimal weighting of visible satellites are exploited. Analysis of optimization method in order to use better satellites according to some defined parameters (elevation, C / N 0 , and GDOP) were carried out. Real GPS L1 C/A signals are exploited to analyze the efficiency of the proposed approach. A comparison of the results through the accumulation of some good satellites among all visible satellites have shown the effectiveness of this method.

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Signal Acquisition and Tracking Loop Design for GNSS Receivers

Geodetic Sciences - Observations, Modeling and Applications ◽

10.5772/55235 ◽

2013 ◽

Author(s):

Kewen Sun

Keyword(s):

Signal Acquisition ◽

Tracking Loop ◽

Loop Design ◽

Gnss Receivers

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Dual-Polarized Synthetic Antenna Array for GNSS Handheld Applications

ISRN Communications and Networking ◽

10.1155/2013/985401 ◽

2013 ◽

Vol 2013 ◽

pp. 1-11

Author(s):

V. Dehghanian ◽

A. Broumandan ◽

M. Zaheri ◽

J. Nielsen

Keyword(s):

Multipath Fading ◽

Antenna System ◽

Signal Acquisition ◽

Gain Enhancement ◽

Coherent Integration ◽

Processing Gain ◽

Size Constraints ◽

Spatially Distributed ◽

Gnss Receivers ◽

Dual Polarized

Small portable Global Navigation Satellite System (GNSS) receivers have revolutionized personal navigation through providing real-time location information for mobile users. Nonetheless, signal fading due to multipath remains a formidable limitation and compromises the performance of GNSS receivers. Antenna diversity techniques, including spatial and polarization diversity, can be used to mitigate multipath fading; however, the relatively large size of the spatially distributed antenna system required is incompatible with the small physical size constraints of a GNSS handheld receiver. User mobility inevitably results in motion of the handset that can be exploited to achieve diversity gain through forming a spatially distributed synthetic array. Traditionally, such motion has been construed as detrimental as it decorrelates the received signal undermining the coherent integration processing gain generally necessary for acquiring weak faded GNSS signals. In this paper the processing gain enhancement resulting from a dual-polarized synthetic array antenna, compatible with size constraints of a small handset that takes advantage of any user imposed motion, is explored. Theoretical analysis and experimental verifications attest the effectiveness of the proposed dual-polarized synthetic array technique by demonstrating an improvement in the processing gain of the GNSS signal acquisition operation.

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