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Design and Processing Method for Doppler-Tolerant Stepped-Frequency Waveform Using Staggered PRF.

Yan Zhang1, Chunmao Yeh1, Zhangfeng Li1

  • 1Beijing Institute of Radio Measurement, Beijing 100854, China.

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|October 13, 2021
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Summary
This summary is machine-generated.

This study introduces a novel stepped-frequency waveform design using staggered pulse repetition frequency to enhance Doppler tolerance for moving targets. This method effectively improves high-resolution range profiling and motion compensation in radar systems.

Keywords:
Doppler toleranceradar waveform designsparse stepped-frequency waveform (SSFW)staggered pulse repetition frequency (SPRF)synthetic wideband signal

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Area of Science:

  • Radar Signal Processing
  • Electromagnetic Waveform Design

Background:

  • Stepped-frequency waveforms enable wideband signal synthesis and high-resolution range profiles without increasing instantaneous bandwidth.
  • Conventional stepped-frequency waveforms suffer from Doppler sensitivity, limiting their utility for tracking moving targets.

Purpose of the Study:

  • To propose an improved waveform design method for enhanced Doppler tolerance in stepped-frequency systems.
  • To effectively address the limitations of conventional stepped-frequency waveforms when applied to moving targets.

Main Methods:

  • Developed a generalized echo model for stepped-frequency waveforms to analyze Doppler sensitivity.
  • Implemented a staggered pulse repetition frequency (PRF) within the stepped-frequency waveform design.
  • Extended the method to sparse stepped-frequency waveforms and developed associated high-resolution range profile synthesis and motion compensation techniques.

Main Results:

  • The proposed staggered PRF method effectively eliminates high-order phase components caused by target velocity.
  • Experimental validation using electromagnetic data confirmed the high Doppler tolerance of the designed waveform.
  • The method demonstrated successful high-resolution range profile synthesis and motion compensation.

Conclusions:

  • The staggered PRF technique significantly enhances the Doppler tolerance of stepped-frequency waveforms.
  • This waveform design is suitable for applications involving moving targets, overcoming previous limitations.
  • The proposed methods provide a robust solution for high-resolution radar imaging and target tracking.