Blind time‐domain motion compensation for synthetic Doppler spectra obtained from an HF‐radar on a floating platform. Issue 4 (12th December 2022)

• Record Type: Journal Article
• Authors: Hashemi, Sepideh; Shahidi, Reza; Gill, Eric W.
• Is Part Of: IET radar, sonar & navigation. Volume 17:Issue 4(2023)
• Page Start: 571
• Page End: 578
• Publication Date: 2022-12-12
• Subjects: Doppler spectrum -- floating platform -- high frequency radar -- motion compensation; Signal processing -- Periodicals; Radar -- Periodicals; Sonar -- Periodicals; Electronics in navigation -- Periodicals; Navigation -- Periodicals; 621.3848
• DOI: 10.1049/rsn2.12361
• Languages: English
• ISSNs: 1751-8784

Abstract

Abstract: A method for time‐domain motion compensation of high frequency (HF) radar signals for the case of a floating transmitter and fixed receiver is proposed when the motion parameters (including the amplitude and angular frequency of the motion) are not known a priori. In this study, the floating platform is assumed to follow a single‐frequency motion model. Additionally, instead of trying to estimate platform motion parameters from the received motion‐contaminated Doppler spectrum, which is proportional to the observed radar cross‐section of the ocean surface from the floating platform, the motion parameters from the autocorrelation function of the received electric field are estimated, which is related to the received radar cross‐section by application of an inverse temporal Fourier transform. By comparing the locations of the zeros of the autocorrelation function for the fixed antenna case with that for an antenna on a floating platform and finding the zeros associated with the platform motion, the motion parameters are estimated. These parameters are matched with actual motion parameter values, from which the motion‐compensated Doppler spectrum is recovered from the Doppler spectrum of the antenna on a floating platform. Abstract : The article considers the case of a monostatic HF radar configuration where the transmitting antenna is on a floating platform while the receiving antenna is fixed. The proposed non‐linear optimisation‐based method in this article is able to successfully estimate the parameters of motion of the floating platform without prior knowledge of them and is also able to accurately compensate for the effect of this platform motion on the Doppler spectra received from the receiver when the transmitter is on this moving platform, even in the presence of noise. In addition, the proposed method is unique in that it considers the received time‐domain signal instead of the frequency‐domain signal as is customary in prior work on the subject.