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Open AccessArticle

Joint Acquisition Estimator of Modern GNSS Tiered Signals Using Block Pre-Correlation Processing of Secondary Code

CTU in Prague, FEE, Department of Radioengineering, Technicka 2, 160 00 Prague, Czech Republic
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Author to whom correspondence should be addressed.
Sensors 2020, 20(10), 2965; https://doi.org/10.3390/s20102965
Received: 27 March 2020 / Revised: 21 May 2020 / Accepted: 22 May 2020 / Published: 23 May 2020
(This article belongs to the Special Issue GNSS Signals and Sensors)
Objective is a joint primary and secondary code (SC) acquisition estimator of tiered Global Navigation Satellite Systems (GNSS) signals. The estimator is based on the Parallel Code Search algorithm (PCS) combined with the Single-Block-Zero-Padding (SBZP) and the Pre-correlation Coherent Accumulation (PCA). The PCA realizes the extension of the coherent integration time in front of the PCS. However, the PCS with the SBZP and the PCA is affected by a navigation/SC bit transition problem due to its cyclic property of a computed Cross-Ambiguity Function (CAF). This CAF is degraded by diverse parasitic fragments and is not directly applicable for an acquisition. A novel analysis of this mechanism and its impact is presented. Then, the proposed modified SBZP (mSBZP) modified PCA (mPCA) PCS estimator is constructed, which does not degrade the CAF. The mSBZP allows the use of the PCS algorithm in the presence of SC bit transition, while the mPCA decreases the number of PCS algorithm calculations by a factor of SC chip count due to SC pre-correlation processing. The algorithm has the same detection performance in comparison with conventional Double-Block-Zero-Padding (DBZP). However, it allows using the PCS of half-length with longer latency up to a factor of SC chip count. View Full-Text
Keywords: block signal processing; GNSS signal acquisition; parallel code search algorithm; pre-correlation coherent accumulation; secondary code; single block zero-padding block signal processing; GNSS signal acquisition; parallel code search algorithm; pre-correlation coherent accumulation; secondary code; single block zero-padding
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Svatoň, J.; Vejražka, F. Joint Acquisition Estimator of Modern GNSS Tiered Signals Using Block Pre-Correlation Processing of Secondary Code. Sensors 2020, 20, 2965.

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