Doppler-invariant pulse compression for targets moving in an arbitrary direction

J. Yang, Tapan Kumar Sarkar

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

It can be shown that a hyperbolic frequency-modulated waveform is Doppler-invariant only when the Doppler factor is a constant number, i.e., the target has a constant velocity and along the direction from the radar to the target. If the target moves in an arbitrary direction, the degradation of the pulse compression caused by the mismatch between the reflected signal and the matched filter may still exist. In this paper, we demonstrate that the Doppler effect caused by the moving target in an arbitrary direction can be approximated by a target with an initial velocity and a constant acceleration along the direction from the radar to the target, which results in a frequency shift in the reflected waveform. Therefore, a bank of matched filters with preselected values of frequency shifts can be utilized to compensate for the Doppler effect. Numerical examples, with target moving in an arbitrary direction, are presented to illustrate this effect, which has been successfully compensated by shifting the frequency response of the matched filter.

Original languageEnglish (US)
Pages (from-to)1449-1453
Number of pages5
JournalMicrowave and Optical Technology Letters
Volume49
Issue number6
DOIs
StatePublished - Jun 2007

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Keywords

  • Arbitrary direction
  • Doppler-invariant
  • Pulse compression

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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