Data and pilot optimised combining method for new composite global navigation satellite system signal acquisition

Abstract

With the increasing adoption of high bit rate navigation signals, the performance of detection is significantly affected by sign transition. To reduce the correlation loss caused by the sign transition, three optimised channel combining methods, which include the optimised non-coherent channel combining, optimised coherent channel combining and optimised differential channel combining, are proposed in this study. Three corresponding analytical expressions of probabilities of detection for the authors methods are derived. To better evaluate the performance of their methods, three corresponding analytical expressions of probabilities of detection for conventional channel combining methods in the presence of sign transition are also derived. Comparing with conventional channel combining and zero padding methods, although increasing the computational cost, their methods can achieve 2–2.5 and 4–6 dB acquisition sensitivity improvements according to the analytic and simulated results. Moreover, experiments on real data from global positioning system L5 further evaluate the detection performance of their methods.