Optimisation and sensitivity analysis of GPS receiver tracking loops in dynamic environments

Jwo, Dah‐Jing

doi:10.1049/ip-rsn:20010429

Cited by 67 publications

(39 citation statements)

References 3 publications

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“…It is known from the transfer function that for a phase-locked loop, its order is determined by the loop filter, and the order of the PLL is equal to the order of the loop filter plus 1 [4] . When design a two order phase-locked loop, it requires to design a firstorder loop filter, For the three order loop, a two order loop filter is required.…”

Section: Hmentioning

confidence: 99%

Design of Signal Capture and Tracking Scheme for Shipborne X Frequency Band Measurement and Control System

Liu¹,

Xie²,

Zuo³

2017

dtcse

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The capture and tracking of satellite signals is the basis for ship stations to measure and control satellites. In the measurement and control of X frequency band, the satellite is far away from the ship station and has large maneuverability, which results in weak signal, big Doppler frequency shift and big dynamics, and the signal is affected by the gravitational force of the large celestial bodies and the solar wind, the phase may be disturbed. This paper designed a signal capturing and tracking method for X band satellite by constructing a model to analyze the two order PLL, three order PLL and two order frequency-locked loop.

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Section: Hmentioning

confidence: 99%

Design of Signal Capture and Tracking Scheme for Shipborne X Frequency Band Measurement and Control System

Liu¹,

Xie²,

Zuo³

2017

dtcse

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“…The PLL used external aiding from ephemerides files and data on motion of the antenna. The software receiver optimized the bandwidth of the PLL based on expected dynamics and signal quality, as suggested by [18]. It predicted the next code delay using a delay locked loop (DLL), aided by the PLL.…”

Section: Acquisition and Trackingmentioning

confidence: 99%

Post-flight trajectory reconstruction of suborbital free-flyers using GPS raw data

Ivchenko¹,

Yuan²,

Linden³

2017

Journal of Geodetic Science

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This paper describes the reconstruction of postflight trajectories of suborbital free flying units by using logged GPS raw data. We took the reconstruction as a global least squares optimization problem, using both the pseudo-range and Doppler observables, and solved it by using the trust-region-reflective algorithm, which enabled navigational solutions of high accuracy. The code tracking was implemented with a large number of correlators and least squares curve fitting, in order to improve the precision of the code start times, while a more conventional phased lock loop was used for Doppler tracking. We proposed a weighting scheme to account for fast signal strength variation due to free-flier fast rotation, and a penalty for jerk to achieve a smooth solution. We applied these methods to flight data of two suborbital free flying units launched on REXUS 12 sounding rocket, reconstructing the trajectory, receiver clock error and wind up rates. The trajectory exhibits a parabola with the apogee around 80 km, and the velocity profile shows the details of payload wobbling. The wind up rates obtained match the measurements from onboard angular rate sensors.

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“…It is a difficult problem to maintain lock on the carrier phase, when user acceleration is involved in the tracking loop. The frequency ramp caused by the satellite motion is usually small in GPS, so we only consider the motion of the vehicle [3]. We assume that the user has an acceleration of a r (m/s 2 ), and the corresponding rate of change of the Doppler frequency can be expressed as…”

Section: Cycle Slipsmentioning

confidence: 99%

Applications of New Fuzzy Inference-Based Tracking Loops for Kinematic GPS Receiver

Mao

2007

Circuits Syst Signal Process

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Abstract. Carrier phase measurement is essential for high-accuracy measurement in kinematic global positioning system (GPS) applications. For GPS receiver design, a narrow noise bandwidth is desired to decrease phase jitter due to thermal noise. However, this bandwidth will deteriorate the capability of the tracking loop and result in cycle slipping. Based on bandwidth adjustment criteria, a novel intelligent GPS receiver is proposed for solving the carrier phase tracking problem in the presence of high dynamic environments. A phase error estimator is developed in the carrier loop to conduct the phase error signals; i.e., frequency and frequency ramp errors. Two kinds of fuzzy inference (FI)-based approaches, fuzzy logic control and adaptive neuro-fuzzy control methods, that are simple and have easy realization properties are designed to perform rapid and accurate control of the digital frequency phase-locked loop (FPLL). A new design procedure for kinematic GPS receiver development is also presented. The computer results show that the FI-based receivers achieve faster settling time and wider pull-in range than the conventional tracking loops while also preventing the occurrence of cycle slips.

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Optimisation and sensitivity analysis of GPS receiver tracking loops in dynamic environments

Cited by 67 publications

References 3 publications

Design of Signal Capture and Tracking Scheme for Shipborne X Frequency Band Measurement and Control System

Design of Signal Capture and Tracking Scheme for Shipborne X Frequency Band Measurement and Control System

Post-flight trajectory reconstruction of suborbital free-flyers using GPS raw data

Applications of New Fuzzy Inference-Based Tracking Loops for Kinematic GPS Receiver

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