Design and implementation of a real‐time software receiver for BDS‐3 signals

Gao, Yang; Yao, Zheng; Lu, Mingquan

doi:10.1002/navi.290

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…In this subsection, the real signal data broadcast by BDS-3 satellites is used to verify the correctness and effectiveness of the proposed algorithm and further investigate the performance of the CAT technique. More specifically, a software receiver (Gao, Yao, & Lu, 2019) with configurable front end is used as the raw IF data recorder to collect real signals from BDS-3 satellites. A post-processing software receiver is developed for real data processing.…”

Section: Real Data Processingmentioning

confidence: 99%

High‐precision unambiguous tracking technique for BDS B1 wideband composite signal

Gao

Yao

2020

Navigation

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In the BeiDou Navigation Satellite System (BDS) B1 band, a single‐sideband complex binary offset carrier (SCBOC) modulation is employed to combine the legacy and the modernized B1 signals into an asymmetric‐wideband composite signal for the backward compatibility. However, SCBOC modulation has only been regarded as a means to achieve the co‐existance between B1I and B1C signals, whose high‐precision ranging potential is not fully understood or exploited. In this paper, a new pathway for BDS B1 receivers to further enhance their ranging precision is established for the first time, by proposing an unambiguous cross‐assisted tracking (CAT) loop, which fully exploits the ranging performance of the SCBOC subcarrier and the inherent coherence between components in the composite signal. Simulation and experiment using live BDS‐3 signals show that compared to the traditional tracking processing for independent components, the CAT loop can significantly improve ranging performance precision, thus providing a high‐precision processing mode for the BDS B1 composite signal.

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Section: Real Data Processingmentioning

confidence: 99%

High‐precision unambiguous tracking technique for BDS B1 wideband composite signal

Gao

Yao

2020

Navigation

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“…B1C and B2a are transmitted by BDS-3 satellite, and the central frequency points are the same as GPS L1/L5 and Galileo E1/E5a, which can ensure better compatibility of BDS with GPS and Galileo [8]. In addition to providing BDS-3 navigation, positioning, and timing services, B2b can also provide services for international search and rescue and global short message communication [9,10].…”

Section: Introductionmentioning

confidence: 99%

Correction Model of BDS-3 Satellite Pseudorange Multipath Delays and Its Impact on Single-Frequency Precise Point Positioning

Guo

et al. 2021

Mathematical Problems in Engineering

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Precise point positioning (PPP) is used in many fields. However, pseudorange multipath delay is an important error that restricts its accuracy. Pseudorange multipath delay can be considered as the combination of effective information and observation noise; it can be modeled after removing the observation noise. In this work, elastic nets (EN) regularization denoising method is proposed and compared with L2-norm regularization denoising method. Then, quadratic polynomial (QP) model plus autoregressive (AR) model (QP + AR) are used to model the denoised pseudorange multipath delays. Finally, the modeling results are corrected to the observations to verify the improvement of BDS-3 single-frequency PPP accuracy. Three single-frequency PPP schemes are designed to verify the effectiveness of denoising method and QP + AR model. The experimental results show that the accuracy improvement of B3I and B2a is more obvious than that of B1I and B1C when the modeling values are corrected to the pseudorange observations. The improvement of B3I and B2a in the east (E) and up (U) directions can reach 10.6%∼34.4% and 5.9%∼65.7%, and the improvement of the north (N) direction is mostly less than 10.0%. The accuracy of B1I and B1C in E and U directions can be improved by 0%∼30.7% and 0.4%∼28.6%, respectively, while the accuracy of N direction can be improved slightly or even decreased. Using EN regularization denoising and QP + AR model correction, single-frequency PPP performs better at B3I and B2a, while L2-norm regularization denoising and QP + AR model correction perform better at B1I and B1C. The accuracy improvement of B2a and B3I is more obvious than that of B1I and B1C. The convergence time after MP correction of each frequency is slightly shorter. Overall, the proposed pseudorange multipath delays processing strategy is beneficial in improving the single-frequency PPP of BDS-3 satellite.

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“…Moreover, low complexity of an acquisition scheme generally means high cost of processing time especially for signals with a long PRN code, and therefore many aided acquisition methods are widely used to speed up the acquisition process of signals with a long PRN code [23]. However, these existing methods are merely based on two types of auxiliary information about code phase and Doppler frequency respectively.…”

Section: Introductionmentioning

confidence: 99%

An innovative FPGA‐based low‐complexity and multi‐constellations compatible GNSS acquisition scheme

Qiu

Wang

et al. 2021

IET Radar Sonar & Navi

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There is a strong demand for the multi-constellations compatible Global Navigation Satellite System (GNSS) acquisition scheme, since it is able to acquire signals from different constellations to increase availability of satellites. However, the presence of multiple modulation modes and diverse Pseudo-Random-Noise (PRN) code lengths makes the design challenging. Moreover, existing schemes consume a lot of hardware resources. Hence, we present an innovative Field Programmable Gate Array (FPGA)-based lowcomplexity and multi-constellation compatible GNSS acquisition scheme to provide a solution for the above-mentioned challenges. This scheme is based on the proposed Improved Serial-Parallel Matched Filter structure that not only requires less hardware resources than conventional structures but also performs all operations in a pipeline to simplify the implementation in FPGA. Additionally, the maximum likelihood criterion is used to obtain decision statistics, which ensures the compatibility between BPSK and sBOC (1,1) signals. Furthermore, a three-step method to acquire signals with a long PRN code is proposed. This also guarantees the compatibility among signals with different PRN code lengths. Finally, a new aided acquisition method to accelerate the acquisition process of signals with a long PRN code is proposed. Experimental results show this scheme is capable of acquiring multi-constellations civil GNSS signals, and therefore it has high practical value. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Design and implementation of a real‐time software receiver for BDS‐3 signals

Cited by 14 publications

References 13 publications

High‐precision unambiguous tracking technique for BDS B1 wideband composite signal

High‐precision unambiguous tracking technique for BDS B1 wideband composite signal

Correction Model of BDS-3 Satellite Pseudorange Multipath Delays and Its Impact on Single-Frequency Precise Point Positioning

An innovative FPGA‐based low‐complexity and multi‐constellations compatible GNSS acquisition scheme

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