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GNSS receiver implementations to mitigate the effects of commensurate sampling frequencies on DLL code tracking
Authors:Vinh T Tran  Nagaraj C Shivaramaiah  Thuan D Nguyen  Eamonn P Glennon  Andrew G Dempster
Institution:1.Australian Centre for Space Engineering Research, School of Electrical Engineering and Telecommunications,University of New South Wales,Sydney,Australia;2.Colorado Center for Astrodynamics Research,University of Colorado Boulder,Boulder,USA;3.School of Information and Communication Technology,Hanoi University of Science and Technology,Hanoi,Vietnam
Abstract:The sampling frequency of a digitized intermediate frequency signal has a strong effect on the measurement accuracy of Global Navigation Satellite System (GNSS) receivers. The delay-locked loop tracking error is significant when the sampling frequency is an integer multiple of the code chipping rate, the so-called commensurate sampling frequency, and the number of distinct instantaneous residual code phases is low. This results in distortions of the correlation shape and discriminator functions that lead to a significant accuracy degradation. These effects are most pronounced when the sampling frequency is low. Notwithstanding, it is generally good for receivers to keep the sampling frequency to a minimum owing to the processing load and power consumption. It creates a challenge for existing GNSS signal processing techniques. Random, sine and sawtooth jitters have been found to mitigate these distortions considerably. A software algorithm and two hardware receiver implementations of these solutions are proposed. A register-based architecture can be directly applied to the conventional receiver architecture, while the increase in resource and power consumption is insignificant. A RAM-based design cannot only considerably minimize utilized resources but also slightly reduce the power consumption compared to the conventional architecture.
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