基于综合短时傅里叶变换的机动目标ISAR成像
ISAR Imaging of Manenvering Target Based on Combined Short-time Fourier Transform
距离-多普勒算法(RD)是基于目标平稳运动的ISAR成像方法。对于机动目标，在成像的观测期间其多普勒频率是时变的。若继续使用RD算法将不能得出清晰的图像，这时需要时频变换方法来对目标成像。常用的短时傅里叶变换(STFT)时频分析方法没有交叉项的干扰，但固定窗函数使时间分辨率和频率分辨率相互制约，不能同时得到较好的时间分辨率和频率分辨率。针对这个问题，提出综合短时傅里叶变换(CSTFT)方法。为了验证CSTFT方法的有效性，将CSTFT方法用于MIG25数据成像。从成像结果知，相比于STFT方法，CSTFT方法得到更高质量的ISAR图像。
Range Doppler algorithm is an ISAR imaging algorithm, which is based on target of smooth movement. The Doppler frequency of maneuvering target varies with time during the imaging observation. In this situation, clear images can't be obtained by RD algorithm, so time-frequency method is usually employed in analyzing the maneuvering target imaging. Widely used short-time Fourier transform(STFT) time-frequency method has no cross-term interference. However, fixed window function makes time resolution and frequency resolution restrain each other, so the better time resolution and frequency resolution can't be got at the same time. To solve this problem, the combined short-time Fourier transform(CSTFT) method is proposed in the paper. To verify the effective of CSTFT method, it is has been applied to MIG25 data imaging. It can be see that compared with STFT method, CSTFT method can obtain better quality ISAR images.
石柳、成萍
雷达
ISAR机动目标短时傅里叶变换综合短时傅里叶变换
ISARmaneuvering targetshort-time Fourier transformcombined short-time Fourier transform
石柳,成萍.基于综合短时傅里叶变换的机动目标ISAR成像[EB/OL].(2015-10-09)[2025-08-11].http://www.paper.edu.cn/releasepaper/content/201510-39.点此复制
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