Real Time Results of Vector Delay Lock Loop in a Light Urban Scenario

Dietmayer, Katrin; Kunzi, Florian; Garzia, Fabio; Overbeck, Matthias; Felber, Wolfgang

doi:10.1109/plans46316.2020.9109832

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…Then, the improved code Doppler replicates instantaneous code phases (i.e., TOA modeling) more precisely, contributing to a higher-quality navigation solution. This type of vector receiver can ultimately alleviate harmful interference to LOS signal estimation, especially when the user's end is moving [25]. Nevertheless, little efficiency is available in the traditional vector tracking loop once the received LOS and NLOS rays are not well discriminated, in terms of the Doppler frequency feature (i.e., the frequency or Fourier domain).…”

Section: Introductionmentioning

confidence: 99%

High-Accuracy Absolute-Position-Aided Code Phase Tracking Based on RTK/INS Deep Integration in Challenging Static Scenarios

et al. 2023

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Many multi-sensor navigation systems urgently demand accurate positioning initialization from global navigation satellite systems (GNSSs) in challenging static scenarios. However, ground blockages against line-of-sight (LOS) signal reception make it difficult for GNSS users. Steering local codes in GNSS basebands is a desirable way to correct instantaneous signal phase misalignment, efficiently gathering useful signal power and increasing positioning accuracy. Inertial navigation systems (INSs) have been used as effective complementary dead reckoning (DR) sensors for GNSS receivers in kinematic scenarios, resisting various forms of interference. However, little work has focused on whether INSs can improve GNSS receivers in static scenarios. Thus, this paper proposes an enhanced navigation system deeply integrated with low-cost INS solutions and GNSS high-accuracy carrier-based positioning. First, an absolute code phase is predicted from base station information and integrated solutions of the INS DR and real-time kinematic (RTK) results through an extended Kalman filter (EKF). Then, a numerically controlled oscillator (NCO) leverages the predicted code phase to improve the alignment between instantaneous local code phases and received ones. The proposed algorithm is realized in a vector-tracking GNSS software-defined radio (SDR). Results of the time-of-arrival (TOA) and positioning based on real-world experiments demonstrated the proposed SDR.

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Section: Introductionmentioning

confidence: 99%

High-Accuracy Absolute-Position-Aided Code Phase Tracking Based on RTK/INS Deep Integration in Challenging Static Scenarios

et al. 2023

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“…The VTL algorithm can track weak signals, which increases the number of visible satellites and, thus, has better performance in harsh environments [29]. Furthermore, the VTL algorithm utilizes other normal operation tracking channels to predict and compensate for the observations of momentary outage signals to maintain continuous tracking [30].…”

Section: Introductionmentioning

confidence: 99%

“…The typical types of VTL include vector delay lock loop (VDLL) [30][31][32], vector frequency lock loop (VFLL) [31,32], vector delay frequency lock loop (VDFLL) [32][33][34], and vector phase lock loop (VPLL) [35]. Hyoungmin So et al propose a VTL algorithm applicable to asynchronous PLPS, significantly mitigating the near-far problem [36].…”

Section: Introductionmentioning

confidence: 99%

An Optimized Vector Tracking Architecture for Pseudo-Random Pulsing CDMA Signals

Lin

Sun

et al. 2021

Sensors

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The vector tracking loop (VTL) has high tracking accuracy and a superior ability to track weak signals in GNSS. However, traditional VTL architecture is established on continuous Code Division Multiple Access (CDMA) signal and is incompatible with pseudolite positioning systems (PLPS) because PLPS generally adopts a pseudo-random pulsing CDMA signal structure to mitigate the near-far effect. Therefore, this paper proposes an optimized VTL architecture for pseudo-random pulsing CDMA signals. To avoid estimation biases in PLPS, the proposed VTL adopts irregular update periods (IUP) pre-filters which adjust the update cycles according to the active timeslot intervals. Meanwhile, as the active timeslots of different pseudolites do not overlap, the sampling time of the navigation filter inputs is inconsistent and time-varying, causing jitter degradation. Thus, the proposed VTL predicts the measurements so that they can be sampled at the same time, which improves tracking accuracy. Simulation is carried out to evaluate the performance of the proposed VTL. The results suggest that the proposed VTL outperforms the traditional pre-filter-based VTL and IUP pre-filter-based VTL.

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Real Time Results of Vector Delay Lock Loop in a Light Urban Scenario

Cited by 2 publications

References 6 publications

High-Accuracy Absolute-Position-Aided Code Phase Tracking Based on RTK/INS Deep Integration in Challenging Static Scenarios

High-Accuracy Absolute-Position-Aided Code Phase Tracking Based on RTK/INS Deep Integration in Challenging Static Scenarios

An Optimized Vector Tracking Architecture for Pseudo-Random Pulsing CDMA Signals

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