Theoretical investigation of DFSI with immunity to both Doppler effect and frequency-sweep nonlinearity  

作　　者：ZHENG Feiteng SHAO Bin SUN Shufeng ZHANG Wu TAN Qinggui ZHANG Wei 

机构地区：[1]China Academy of Space Technology(Xi'an),Xi'an 710110,China [2]School of Electronic Information,Northwestern Polytechnical University,Xi'an 710129,China [3]The Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education),Chongqing University,Chongqing 400044,China [4]Artificial Intelligence Center,Peng Cheng Laboratory,Shenzhen 518000,China

出　　处：《Optoelectronics Letters》2022年第11期662-667,共6页光电子快报（英文版）

基　　金：supported by the Sustainably Supported Foundation of SASTIND (No.HTKJ2021KL504008);the National Natural Science Foundation of China (No.51805054);the China Postdoctoral Science Foundation (No.2018M643405);the Technology Innovation Platform Project of Aero Engine Corporation of China (No.SHYS-GXDPL-18)。

摘　　要：Frequency-swept interferometry(FSI) is a well-known ranging technique, but it suffers from three problems, namely, the Doppler effect, the frequency-sweep nonlinearity, as well as the slow frequency-sweep rate. The first two problems hinder the measurement accuracy, while the third problem limits the measurement rate. In this paper, we present a dynamic FSI(DFSI) that solves these three fundamental problems simultaneously. The DFSI consists of two auxiliary interferometers(AU1 and AU2) and two measurement interferometers(FSI and frequency-fixed interferometry(FFI)). We use FSI to obtain the Doppler and nonlinearity affected ranging signal, AU1 to monitor the frequency-tuning nonlinearity in the frequency-swept laser(FSL), and FFI and AU2 to constitute a laser vibrometer for monitoring the target motion-induced Doppler effect. Then, a novel signal fusion processing technique is applied to reconstruct the real dynamic distance from the above-measured signals. The dynamic ranging error caused by the Doppler effect and frequency-sweep nonlinearity in FSI can be eliminated and the dynamic distance at each sampling point can be obtained. The validity of this method is demonstrated by numerical experiments.

关 键 词：INTERFEROMETER tuning NONLINEARITY 

分 类 号：TN248[电子电信—物理电子学]