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Long-Time Coherent Integration Method for Passive Bistatic Radar Using Frequency Hopping Signals.

Gang Chen1, Xiaowei Biao1, Yi Jin1

  • 1China Academy of Space Technology, Xi'an 710100, China.

Sensors (Basel, Switzerland)
|October 16, 2024
PubMed
Summary

This study introduces a new coherent integration method for passive bistatic radar using frequency hopping signals. The technique effectively compensates for Doppler diffusion, improving detection performance for weak targets.

Keywords:
Doppler frequency migrationcoherent integrationfrequency hoppingpassive bistatic radarrange curverange walk

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Electromagnetics

Background:

  • Coherent integration of frequency hopping signals in passive bistatic radar is challenging.
  • Frequency hopping introduces Doppler diffusion, range walk, range curve, and Doppler frequency migration, degrading detection performance.

Purpose of the Study:

  • To propose a novel coherent integration method for passive bistatic radar with frequency hopping signals.
  • To address the performance degradation caused by Doppler diffusion and other migration effects.

Main Methods:

  • Generalized Keystone transform to eliminate range curve and range walk.
  • Parameter search for compensating target acceleration-induced Doppler frequency migration.
  • Novel acceleration compensation function and revised rotation factor for Fourier transform to compensate for frequency hopping-induced Doppler frequency migration.

Main Results:

  • The proposed method effectively compensates for migration effects caused by frequency hopping.
  • Improved integration of weak target echoes within the observation time.
  • Simulation results validate the method's effectiveness.

Conclusions:

  • The novel coherent integration method enhances detection performance for passive bistatic radar with frequency hopping signals.
  • The approach successfully mitigates Doppler diffusion and other signal migration issues.