Premium
Doppler‐invariant pulse compression for targets moving in an arbitrary direction
Author(s) -
Yang J.,
Sarkar T. K.
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22454
Subject(s) - doppler effect , pulse compression , waveform , matched filter , physics , acoustics , doppler radar , moving target indication , optics , radar , invariant (physics) , pulse (music) , constant (computer programming) , signal (programming language) , filter (signal processing) , pulse doppler radar , mathematics , computer science , radar imaging , telecommunications , computer vision , astronomy , detector , mathematical physics , programming language
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. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1449–1453, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22454