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

Hongbo Zhao1, Yinan Hu2, Hua Sun3

  • 1School of Electronic and Information Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China. bhzhb@buaa.edu.cn.

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|May 13, 2018
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Summary
This summary is machine-generated.

This study introduces an adaptive linear phase IIR notch filter to improve Beidou Navigation Satellite System (BDS) receivers. The new method suppresses interference and compensates for signal distortion, enhancing positioning accuracy.

Keywords:
adaptive linear phase IIR notch filtercorrelation peak distortioninterference suppressionnon-linear phase compensation

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Area of Science:

  • Satellite Navigation Systems
  • Signal Processing
  • Electromagnetic Interference

Background:

  • Continuous wave interferences (CWIs) and narrow-band interferences (NBIs) degrade Beidou Navigation Satellite System (BDS) receiver accuracy.
  • Adaptive infinite-duration impulse response (IIR) notch filters are commonly used but introduce nonlinear phase distortion.
  • This distortion affects signal acquisition, tracking, and introduces positioning errors, a problem often overlooked.

Purpose of the Study:

  • To develop a novel adaptive linear phase IIR notch filter for BDS receivers.
  • To address both interference suppression and signal distortion compensation simultaneously.
  • To offer a low-hardware-cost solution for enhanced BDS performance.

Main Methods:

  • Proposed a new adaptive linear phase IIR notch filter.
  • The filter comprises complex IIR notch filters, a linear phase structure, and adaptive variable step-size algorithms.
  • Compared the proposed method against existing IIR filters in CWI and NBI scenarios.

Main Results:

  • The proposed filter effectively suppresses CWIs and NBIs.
  • It successfully compensates for correlation peak distortion caused by IIR filters.
  • Demonstrated superior anti-jamming performance in NBI scenarios compared to other IIR filters.

Conclusions:

  • The adaptive linear phase IIR notch filter offers a viable solution for mitigating interference and signal distortion in BDS receivers.
  • This method achieves interference suppression and distortion compensation with a modest increase in hardware cost.
  • The proposed filter enhances the overall accuracy and reliability of BDS positioning.