The BDS receiver tracking loop based on the weight adjustment and adaptive bandwidth

摘要

With BDS receiver widely used in many fields, it faced some problems such as wide range of dynamic stress and thermal noise interference which caused by receiver racing and thermal shock of electrons in the process of tracking. Conventional receiver increase the bandwidth to expand the dynamic stress range, but it caused more thermal noise getting into the loop so that tracking accuracy decreased. In order to improve receiver tracking performance, a design scheme of the BDS receiver tracking loop based on the weight adjustment and adaptive bandwidth is proposed. This scheme utilizes line-of-sight dynamic of BDS receiver and carrier to noise power density ratio to adaptively adjust the bandwidth and the weight of the loop order so that the loop has a better noise inhibitory effect under the premise of stable tracking. The simulation results show that compared to the conventional receiver which is using fixed bandwidth and tracking loop order, this scheme can enhance the dynamic tracking performance and tracking accuracy.