Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (2): 208-212.DOI: 10.12068/j.issn.1005-3026.2021.02.009

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Coding Incentive Algorithm Based on PDChirp-Golay Signal

BAO Xi-rong, GAO Hao-sen, LI Zheng-shuang, ZHANG Shi   

  1. School of Computer Science & Engineering,Northeastern University, Shenyang 110169, China.
  • Received:2020-04-15 Revised:2020-04-15 Accepted:2020-04-15 Published:2021-03-05
  • Contact: GAO Hao-sen
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Abstract: To solve the problem of high sidelobe in ultrasonic imaging algorithms induced by LFM signal coding, a new method of PDChirp-Golay coding based on amplitude weighting is proposed. This method predistorts linear frequency modulation(LFM) signals, thus compensating the influence of ultrasonic probe on the emission signal, which makes the bandwidth of the echo signal increase, improves the axial resolution, and eliminates the Fresnel corrugation of the emission signal amplitude frequency characteristics at the same time, realizing sidelobe suppression. Then, the predistorted LFM signal is used to modulate Golay code. The range sidelobe level of Golay code is zero in theory, which makes the sidelobe further suppressed. The simulation results show that, compared with the single predistorted LFM signal and Golay code, Golay code modulated by the predistorted Chirp signal improves the axial resolution and contrast, and has a good anti-noise performance, which provides a theoretical basis for the realization of high-quality ultrasonic imaging system.

Key words: coded excitation; predistorted LFM signal; Golay code; axial resolution; ultrasonic imaging

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