A BDS Interference Suppression Technique Based on Linear Phase Adaptive IIR Notch Filters

• DOI: 10.3390/s18051515
• Publication Date: 2018-05-14T06:57:20Z
• Authors: Hongbo Zhao; Yinan Hu; Hua Sun; Wenquan Feng
• Keywords: Phase distortion; Distortion (music); Linear phase

The continuous wave interferences (CWIs) and the narrow-band (NBIs) have significantly impacted acquisition, tracking positioning accuracy of Beidou Navigation Satellite System (BDS) receivers. As an interference suppression technology with a simple structure low hardware cost, adaptive infinite-duration impulse response (IIR) notch filter has been widely employed in receivers to mitigate CWIs NBIs. However, nonlinear phase characteristics introduced by IIR filters into navigation receivers, may cause distortion signals. It also leads amplitude correlation peak acquisition loop tracking, which consequently brings on errors measurement domain. This problem, however, ignored many previous papers. Meanwhile, some other researchers came up idea equalizers all-pass networks compensating distortion, is highly infeasible. Therefore, we propose new method linear cost composed three parts—the complex filters, structure, variable step-size algorithms. Applying this method, compensation can be achieved modest increase cost. paper compares performance both CWI NBI scene presents effects its parameters anti-jamming performance. Simulation results show that proposed module better compensate for meantime.