Generalised likelihood ratio test detector for micro-motion targets in synthetic aperture radar raw signals

In this paper, we propose a novel strategy to estimate the micro-motion (m-m) of ships from synthetic aperture radar (SAR) images. To this end, observe that the problem of motion and m-m detection of targets is usually solved using synthetic aperture radar (SAR) along-track interferometry through two radars spatially separated by a baseline along the azimuth direction. The approach proposed in this paper for m-m estimation of ships, occupying thousands of pixels, processes the information generated during the coregistration of several re-synthesized time-domain and not overlapped Doppler sub-apertures. Specifically, the SAR products are generated by splitting the raw data according to a temporally small baseline using one single wide-band staring spotlight (ST) SAR image. The predominant vibrational modes of different ships are then estimated. The performance analysis is conducted on one ST SAR image recorded by COSMO-SkyMed satellite system. Finally, the newly proposed approach paves the way for application to the surveillance of land-based industry activities.

Download Full-text

A Novel Isar Active Jamming Method Based on Micro-Motion Modulation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.490-491.723 ◽

2014 ◽

Vol 490-491 ◽

pp. 723-726

Author(s):

Yu Zhang ◽

Cong Feng Liu ◽

Yan Zhu

Keyword(s):

Synthetic Aperture Radar ◽

Simulated Data ◽

Sinusoidal Signal ◽

Synthetic Aperture ◽

Inverse Synthetic Aperture Radar ◽

Active Method ◽

Micro Motion ◽

Jamming Effect ◽

Aperture Radar

It is potentially useful to perform deception or cover jamming using the rotating angular reflectors. Inspired by the coherent jamming and micro-motion modulation, a novel active method is proposed for Inverse Synthetic Aperture Radar. Radar pulses are sampled and frequency modulated along azimuth by sinusoidal signal, and then the jamming signals are retransmitted to the radar and the jamming images are induced. The jamming principle, key parameters and the jamming effect are discussed. The simulated data verify the effectiveness of the jamming method.

Download Full-text

Pixel Tracking for Micro-Motion Estimation of Maritime Targets by COSMO-SkyMed Synthetic Aperture Radar Data - An Operative Assessment

10.20944/preprints201905.0260.v1 ◽

2019 ◽

Author(s):

Filippo Biondi

Keyword(s):

Synthetic Aperture Radar ◽

Wide Band ◽

Radar Data ◽

Satellite System ◽

Synthetic Aperture ◽

Sar Image ◽

Synthetic Aperture Radar Data ◽

Micro Motion ◽

Operative Assessment ◽

Aperture Radar

This research aims to estimate the micro-motion (m-m) of ships. The problem of motion and m-m detection of targets is usually solved using synthetic aperture radar (SAR) along-track interferometry (ATI) which is observed employing two radars spatially distanced by a baseline extended in the azimuth direction. This paper is proposing a new approach where the m-m estimation of ships, occupying thousands of pixels, is measured processing the information given by sub-pixel tracking generated during the coregistration process of several re-synthesized time-domain and overlapped sub-apertures. The SAR products are generated splitting the raw data, according to a small-temporal baseline strategy, observed by one single wide-band staring spotlight (ST) SAR image. The predominant vibrational modes of different ships are estimated and results are promising to extend this application in performing surveillance also of land-based industries activities. Experiments are performed processing one ST SAR image observed by the COSMO-SkyMed satellite system.

Download Full-text