非合作目标光频扫描干涉信号快速检测方法  

Fast Detection Method for Frequency Scanning Interference Signals of Non-Cooperative Targets

作　　者：赵晖 吴腾飞[1] 周强 段志君 Zhao Hui;Wu Tengfei;Zhou Qiang;Duan Zhijun(National Key Laboratory of Precision Testing Techniques and Instrument,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《光学学报》2023年第7期58-66,共9页Acta Optica Sinica

基　　金：国家自然科学基金(52127810,51721003)。

摘　　要：研究非合作目标光频扫描干涉信号的快速检测方法,采用稀疏傅里叶变换算法快速求解距离谱,通过引入综合Rife算法精密校正距离谱,可大幅提升解算效率,保证解算精度。实验结果表明,所设计的硬件检测单元能够高效采集并处理不同粗糙度、入射距离及入射角度的非合作目标干涉信号,2 MB数据的处理时间为0.1224 s,在12 m范围内测距误差小于13μm,标准差优于10μm。Objective The large-scale equipment manufacturing represented by aircraft and ships continues to promote digitalization and gradually develops toward intelligence,which leads to a sharp increase in the geometric measurement missions on the manufacturing site and a more complex and changeable on-site environment.Therefore,measurement must take into account adaptability,efficiency,and accuracy.Frequency scanning interferometry(FSI)ranging technology can be applied to non-cooperative targets to tackle the low measurement efficiency problem in the manufacturing field.However,it also confronts some problems,such as weak interference signal strength,low signal-to-noise ratio(SNR),and a large amount of data.According to the characteristics of FSI signals of non-cooperative targets,the distance to be measured is usually calculated with the interference beat frequency resolved through the spectrum.However,the discrete spectrum is affected by signal truncation in the time domain,and its amplitude,phase,and frequency are subject to large errors.Hence,spectrum correction is required for higher accuracy.The existing signal processing methods are based on the fast Fourier transform(FFT)+spectrum thinning algorithm,which are inefficient and difficult to meet the requirements of manufacturing sites.Therefore,according to the characteristics of FSI signals of non-cooperative targets,this paper uses the sparse Fourier transform(SFT)algorithm to quickly solve the range spectrum and introduces the synthesized Rife(s-Rife)algorithm to precisely correct the range spectrum,which greatly improves the understanding efficiency while Methods In this paper,a mathematical model is built to study the basic principle of FSI and the influence of the surface roughness,spatial distance,and incident angle of non-cooperative targets on FSI signal strength and SNR.A fast detection method for FSI signals of non-cooperative targets is proposed to overcome the shortcomings of existing processing methods in accuracy,efficiency,and adaptability.This meth

关 键 词：测量 光频扫描干涉 非合作目标 频谱校正 绝对距离测量 

分 类 号：TN249[电子电信—物理电子学]