Use of a Vector Delay Lock Loop Receiver for GNSS Signal Power Analysis in Bad Signal Conditions

Pany, Thomas; Eissfeller, Bernd

doi:10.1109/plans.2006.1650689

Cited by 80 publications

(38 citation statements)

References 4 publications

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“…There are four states in the EKF. If the measurements of the EKF are more than four, then the variance of the dynamic stress error and oscillator noise error will be decreased which is similar to a vector delay lock loop (VDLL) [10,11]. If the error of the dynamic stress and oscillator noise can be estimated more precisely, the bandwidth of the local filter can be decreased which subsequently decreases the thermal noise error.…”

Section: Transfer Function Models For the Joint Vpllmentioning

confidence: 99%

Improvement of Carrier Phase Tracking Based on a Joint Vector Architecture

Chen

Gao

2017

International Journal of Aerospace Engineering

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Carrier phase measurements are essential to high precision positioning. Usually, the carrier phase measurements are generated from the phase lock loop in a conventional Global Navigation Satellite System (GNSS) receiver. However there is a dilemma problem to the design of the loop parameters in a conventional tracking loop. To address this problem and improve the carrier phase tracking sensitivity, a carrier phase tracking method based on a joint vector architecture is proposed. The joint vector architecture contains a common loop based on extended Kalman filter to track the common dynamics of the different channels and the individual loops for each channel to track the satellite specific dynamics. The transfer function model of the proposed architecture is derived. The proposed method and the conventional scalar carrier phase tracking are tested with a high quality simulator. The test results indicate that carrier phase measurements of satellites start to show cycle slips using the proposed method when carrier noise ratio is equal to and below 15 dB-Hz instead of 21 dB-Hz with using the conventional phase tracking loop. Since the joint vector based tracking loops jointly process the signals of all available satellites, the potential interchannel influence between different satellites is also investigated.

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Section: Transfer Function Models For the Joint Vpllmentioning

confidence: 99%

Improvement of Carrier Phase Tracking Based on a Joint Vector Architecture

Chen

Gao

2017

International Journal of Aerospace Engineering

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“…In this form the VDLL is known to be a robust tool to track the satellite signals even in bad conditions [8].…”

Section: A Vector Trackingmentioning

confidence: 99%

Position domain joint tracking

Giger

Guunther

2010

2010 5th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC

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It was shown that the Vector Delay Lock Loop (VDLL) enhances the robustness of a GNSS receiver by exploiting the spatial correlation of the received signals. But due to the periodicity of the carrier, the VDLL only operates on the codephase and the carrier-frequency. In contrast to the VDLL, the Joint Tracking receiver manages to sustain the carrier-phase lock even in fast-changing, difficult environments. Other than the VDLL, the Joint Tracking algorithm doesn't estimate the receiver's location. The novel Position Domain Joint Tracking algorithm, described in this paper, combines both approaches, gaining from the advantages of both concepts. It is tested with signals generated by a constellation simulator, simulating a stationary and dynamic receiver. The test runs are discussed in terms of positioning performance. They show the big potential of such a combined receiver scheme as the signal synchronization is robust and the position estimate precise.

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“…The robustness of a vector delay/frequency lock loop (VDFLL) is demonstrated by Pany and Eissfeller (2006). The work by Lashley (2009) uses two VRs with position state and pseudorange state formulations to show that the main performance benefit is information exchange among VR channels.…”

Section: Introductionmentioning

confidence: 99%

Vectorized and federated software receivers combining GLONASS and GPS

et al. 2017

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In traditional federated receiver, all the tracking channels work independently, and there is no interaction among them. However, in vectorized receiver, stronger channels aid others in their tracking. Such architecture makes a receiver to be of interest for positioning in urban canyons and harsh environments. On the other hand, the combination of GPS and GLONASS as the only augmented global constellations is utilized to increase the availability of the receivers which is defined as the percentage of the epochs with enough number of tracked satellites for solving the positioning equation. We report about the software implementation of a GPS-combined-GLONASS Vectorized Receiver (GGVR) and performance assessment of this architecture in signal attenuation and blocking incidents. We also compare the GGVR performance with a GPScombined-GLONASS Federated Receiver (GGFR). Experimental tests in different case studies are included. The results show that in the static blocking situation, the GGVR can reacquire the signal immediately after the momentary outage while the GGFR must return to acquisition stage. For two dynamic case studies, one in a suburban road and one in an urban canyon, the position results on the road are the same, but in an urban environment, the GGFR has only 88% availability in contrast to 100% availability of the GGVR.

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Use of a Vector Delay Lock Loop Receiver for GNSS Signal Power Analysis in Bad Signal Conditions

Cited by 80 publications

References 4 publications

Improvement of Carrier Phase Tracking Based on a Joint Vector Architecture

Improvement of Carrier Phase Tracking Based on a Joint Vector Architecture

Position domain joint tracking

Vectorized and federated software receivers combining GLONASS and GPS

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