摘要：A high-resolution time-frequency spectrum is desirable for processing and interpreting seismic data. The W trans-form is a method that effectively preserves the resolution in the low-frequency region of the time-frequency spectrum of nonstationary seismic signals. To further increase the energy concentration of the time-frequency spectrum estimated with the W transform, we propose to combine the W trans-form with a chirp-modulated window. The chirp rate in the chirp-modulated window can control the rotation of the win-dow in the time-frequency plane to achieve a better match with the time-frequency spectrum. The chirp rate in the modified W transform can be directly determined with the estimated instantaneous frequency. It has been shown that the W transform with a chirp-modulated window main-tains the resolution of the time-frequency spectrum and im-proves the energy concentration around the dominant frequency against noise. To speed up the computational process of the W transform with a chirp-modulated window, we formulate the transform as a matrix-vector multiplica-tion, which can be accelerated by using graphics processing unit computations. The application of the modified algo-rithm to synthetic and field data indicates that the frequency anomalies can be easily identified with the modified W transform.

ISSN号：0016-8033

卷、期、页：卷88期2: V93-V100

发表日期：2023-03-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,地学领域高质量科技期刊分级目录（国外T1）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：GEOPHYSICS

参与作者：王仰华

第一作者：赵振聪,饶莹

论文类型：期刊论文

论文概要：赵振聪,饶莹,王仰华，The W transform with a chirp-modulated window，GEOPHYSICS，2023，卷88期2: V93-V100

论文题目：The W transform with a chirp-modulated window