An advanced technique to recover from BOC(1,1) false locks during the acquisition stage

摘要

This paper investigates a novel algorithm based on the Bump and Jump technique, capable of detecting and recovering from possible false lock events during the acquisition stage of BOC(1,1) Signals. Indeed the traditional Bump and Jump technique might lead to a false lock, in particular in harsh scenarios affected by strong multipath. Concerning this undesired event, an analysis of False Lock probability is provided to assess the goodness of the new approach w.r.t. the traditional Bump and Jump algorithm. The new algorithm is compared to the classical one, providing statistics on the False Locks occurrence after the Transition to Tracking stage, given the probability density function of the coarse delays estimated in the Acquisition stage. This analysis has been extensively assessed by means of a semi-analytic MATLAB™ simulator, representative of the Acquisition and Transition to Tracking stages of a GNSS Ground Receiver. Two different multipath models have been considered applicable to the Reference Stations context: the two rays ground multipath and diffuse multipath. A preliminary assessment with a GNSS signals simulator and a receiver prototype are also included so as to demonstrate the applicability of the software simulation results to both Bump and Jump methods.