Theoretical Performance Analysis and Comparison of VDFLL and Traditional FLL Tracking Loops

Abstract

GNSS signal tracking loops performance strongly affect by tracking parameters setting. If the tracking parameters are not set correctly then the tracking loop may not perform well which may compromise the accuracy of the receiver performance. Therefore, In this paper theoretical performance analysis and comparison of traditional frequency locked loop (FLL) and vector delay frequency locked loop (VDFLL) is presented. The performance analysis is conducted on the basis of tracking parameters setting such as noise bandwidth for the traditional FLL and process noise of dynamic for the VDFLL. Large numerical simulation is conducted to evaluate the tracking sensitivity and dynamic stress capacity over the specific range of noise bandwidth and process noise of dynamic for the traditional FLL and VDFLL respectively. The analysis results illustrate that the VDFLL can achieve 6–8 dB sensitivity and 6–40 g dynamic performance improvement over traditional FLL.