DME pulse interference mitigation for airborne BDS and flight test results

摘要

BeiDou Navigation Satellite System (BDS) B2 signal works in the aeronautical radio navigation services (ARNS) band. It suffers high-power pulse interference, particularly from distance measuring equipment (DME), which will affect signal acquisition, signal tracking, as well as positioning of airborne BDS receiver. Regarding the problem, a DME pulse interference mitigation algorithm based on FLOC-TDE (Fractional Lower Order Covariance-Time Delay Estimation) is proposed in this paper, which can effectively mitigate DME pulse and retain useful BDS satellite signals. We firstly analyzed the live data collected from COMAC (Commercial Aircraft Corporation of China Ltd) Airborne BDS First Flight Project. And then, experiments on COMAC airborne BDS experiment platform were performed. The proposed algorithm, time domain pulse blanking algorithm and non-mitigation algorithm were compared in the experiments. The values of correlation peak to secondary peak ratio (CPSP) and the correlation peak to mean peak ratio (CPMP), and carrier-to-noise ratio (C/N-0) using the proposed algorithm were the biggest. The results verify that the proposed algorithm can mitigate DME pulse interference, improve acquisition and tracking performance of airborne BDS receiver, which can ensure the system integrity. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.