电子测量与仪器学报

邓贵文,李晋,邢婉君,吴文彬.基于拓展Omega-K算法的OFDM信号的合成孔径成像算法研究[J].电子测量与仪器学报,2026,40(3):273-281

基于拓展Omega-K算法的OFDM信号的合成孔径成像算法研究

Research on synthetic aperture imaging algorithm for OFDM signalsbased on the extended Omega-K algorithm

DOI：

中文关键词: 距离多普勒算法正交频分复用拓展Omega-K算法合成孔径成像 Stolt插值

英文关键词:distance doppler algorithm orthogonal frequency division multiplexing extended omega-K algorithm synthetic aperture imaging stolt interpolation

基金项目:

作者	单位
邓贵文	电子科技大学信息与通信工程学院成都611731
李晋	电子科技大学信息与通信工程学院成都611731
邢婉君	电子科技大学信息与通信工程学院成都611731
吴文彬	电子科技大学信息与通信工程学院成都611731

Author	Institution
Deng Guiwen	School of Information and Communication Engineering University of Electronic Science and Technology of China, Chengdu 611731, China
Li Jin	School of Information and Communication Engineering University of Electronic Science and Technology of China, Chengdu 611731, China
Xing Wanjun	School of Information and Communication Engineering University of Electronic Science and Technology of China, Chengdu 611731, China
Wu Wenbin	School of Information and Communication Engineering University of Electronic Science and Technology of China, Chengdu 611731, China

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中文摘要:

在合成孔径雷达(SAR)与通信一体化应用场景中，SAR成像功能通常基于传统的距离多普勒算法（RDA）实现，然而该算法在较大斜视角的成像场景下会出现几何失真。针对该问题，提出了基于拓展Omega-K算法的OFDM信号的合成孔径成像方法，将传统的Omega-K算法应用到OFDM信号的合成孔径成像中，对基于OFDM信号的合成孔径成像的回波信号进行去循环前缀(CP)操作，在完成距离及方位向的二维脉冲压缩后，对斜视条件下所引起的相位偏移进行补偿。随后通过二维频域下的Stolt插值解除距离及方位向间的高阶相位耦合，并对多普勒频偏进行补偿，以实现最终的二维成像。最后，基于所提算法在正侧视以及较大斜视场景下开展了对单点目标和多点目标的成像仿真实验，通过对比仿真实验得出，相比于传统的基于RDA的OFDM信号的合成孔径成像算法，在正侧视场景下，基于EWKA成像算法方位向的PSLR从-12.32 dB提升到-17.024 dB，提升约38.1%，距离向性能相差不大。在斜视场景下，使用传统的基于RDA的成像算法对目标成像会出现散焦，不能实现很好的成像，而基于EWKA成像算法仍然能够实现很好的聚焦，对比仿真验证了基于EWKA的成像算法在正侧视以及较大斜视下的可行性和有效性。基于EWKA的OFDM信号的合成孔径成像算法能够在正侧视和斜视场景下实现良好的合成孔径成像，解决了传统的基于RDA的OFDM信号的合成孔径成像方法在较大斜视场景下成像出现散焦的问题，同时也提高了正侧视场景下方位向性能。

英文摘要:

In the integrated application scenario of synthetic aperture radar (SAR) and communication, SAR imaging is typically implemented using the traditional range-Doppler algorithm (RDA). However, this method encounters geometric distortion in imaging scenarios with large squint angles. To address this issue, a synthetic aperture imaging method for OFDM signals based on the extended Omega-K algorithm (EWKA) is proposed. This method applies the traditional Omega-K algorithm to OFDM signal-based synthetic aperture imaging. After removing the cyclic prefix (CP) from the echo signals, two-dimensional pulse compression is performed in the range and azimuth directions. Phase shift compensation is applied to correct phase deviations caused by squint conditions.Subsequently, Stolt interpolation in the two-dimensional frequency domain is used to decouple higher-order phase coupling between the range and azimuth directions, and Doppler frequency offset compensation is performed to achieve the final two-dimensional imaging. Finally, simulation experiments on single-point and multi-point targets were conducted in both side-looking and large squint scenarios. Comparative simulation results show that, in side-looking scenarios, the EWKA-based imaging algorithm improves the azimuth PSLR from -12.32 dB to -17.024 dB, an enhancement of approximately 38.1%, while maintaining comparable range performance. In squint scenarios, the traditional RDA-based imaging algorithm suffers from defocusing and fails to achieve satisfactory imaging, whereas the EWKA-based algorithm maintains good focus. The simulation results verify the feasibility and effectiveness of the EWKA-based imaging algorithm under both side-looking and large squint conditions. The proposed EWKA-based OFDM signal synthetic aperture imaging algorithm not only resolves the defocusing issue encountered in traditional RDA-based methods in large squint scenarios but also enhances azimuth performance in side-looking scenarios, significantly expanding the applicability of OFDM signal-based synthetic aperture imaging.

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