A programmable multi-GNSS baseband receiver

Tran, Vinh T.; Shivaramaiah, Nagaraj C.; Diessel, Oliver; Dempster, Andrew G.

doi:10.1109/iscas.2015.7168849

Cited by 5 publications

(1 citation statement)

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“…If the Doppler is f D = 2 kHz, the integration period must be T ≥ 192·5 ms. However, the coherent integration period should be smaller than 20 ms or 10 ms, with or without data bit synchronisation, respectively, or may be shorter due to secondary code transitions (Tran et al, 2015; Shivaramaiah et al, 2008). High Doppler frequencies, high LO drifts, and long integration periods such as tracking a data-less (Pilot) channel can help to reduce the correlation and discriminator distortions, but a typical receiver usually has a stable LO and a short integration period ( T ≤ 20 ms) for tracking, thus the effect of sampling frequency should be considered for every Doppler frequency.…”

Section: Effect Of Sampling Frequency On Correlation Shape and Dll DImentioning

confidence: 99%

Generalised Theory on the Effects of Sampling Frequency on GNSS Code Tracking

Tran¹,

Shivaramaiah

Nguyen

et al. 2017

J. Navigation

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Synchronisation of the received Pseudorandom (PRN) code and its locally generated replica is fundamental when estimating user position in Global Navigation Satellite System (GNSS) receivers. It has been observed through experiments that user position accuracy decreases if sampling frequency is an integer multiple of the nominal code rate. This paper provides an accuracy analysis based on the number of samples and the residual code phase of each code chip. The outcomes reveal that the distribution of residual code phases in the code phase range [0, 1/ns), where ns is the number of samples per code chip, is the root cause of accuracy degradation, rather than the ratio between sampling frequency and nominal code rate. Doppler frequencies, coherent integration periods, front-end filter bandwidths and received Carrier to Noise ratios (C/N0) also influence receiver accuracy. Also provided are a sampling frequency selection guideline and new proposed estimates of the correlation output and the Delay Locked Loop (DLL) tracking error, which can be applied to precisely model GNSS receiver baseband signal processing.

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Section: Effect Of Sampling Frequency On Correlation Shape and Dll DImentioning

confidence: 99%