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Moving target indication

About: Moving target indication is a research topic. Over the lifetime, 2653 publications have been published within this topic receiving 32435 citations.


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Patent
17 Nov 1992
TL;DR: In this paper, a range-doppler ambiguity is eliminated from an ultra-wideband radar system by transmitting an ultra wideband chirped pulse towards a moving target, and mixing it with the doppler-shifted CHIRped pulse which is received as a target echo return signal.
Abstract: Range-Doppler ambiguity is eliminated from an ultra-wideband radar system by transmitting an ultra-wideband chirped pulse towards a moving target, and mixing it with the doppler-shifted chirped pulse which is received as a target echo return signal. Multioctave radar tracing systems can potentiality track stealth aircraft without ambiguity since pulses containing many frequencies can defeat narrow-band radar absorbing material coatings. The unambiguous range-doppler signal processing method mixes the chirped pulse to yield an instantaneous Doppler frequency (which indicates target velocity) and a rate of change in the instantaneous Doppler frequency (which indicates target acceleration).

29 citations

07 Jun 2010
TL;DR: In this paper, the authors derived two processing methods for optimum SAR/GMTI (Ground Moving Target Indication) for ground moving target Indication, EDPCA (Extended Displaced Phase Center Antenna) and ISTAP (Imaging Space Time Adaptive Processing) based on coherent integration of the post-Doppler STAP (Space Time Adaptative Processing) outputs to increase the target SNR (Signal-to-Noise Ratio).
Abstract: This paper derives two processing methods for optimum SAR/GMTI (Ground Moving Target Indication). The first method, EDPCA (Extended Displaced Phase Center Antenna) extends the well-known DPCA (Displaced Phase Center Antenna) and ATI (Along-Track Interferometry) processing to three or more receive channels. The second method, ISTAP (Imaging Space Time Adaptive Processing), is based on coherent integration of the Post-Doppler STAP (Space Time Adaptive Processing) outputs to increase the target SNR (Signal-to-Noise Ratio).

29 citations

Journal ArticleDOI
TL;DR: This letter proposes a novel deramp space-time adaptive processing (Deramp-STAP) method for synthetic aperture radar (SAR) systems to achieve effective clutter suppression and can overcome the spectral wrapping problem of a moving target from a Doppler shift.
Abstract: This letter proposes a novel deramp space-time adaptive processing (Deramp-STAP) method for synthetic aperture radar (SAR) systems to achieve effective clutter suppression. Compared with the traditional STAP, the proposed method can overcome the spectral wrapping problem of a moving target from a Doppler shift. Furthermore, in the case of signal undersampling, the ambiguously focused position in azimuth for a moving target can be avoided by the proposed method. Moreover, the computational complexity can be drastically reduced because we only need to consider the baseband velocity of the moving target; here, the range of the baseband velocity is much smaller than that of the real target velocity, for clutter suppression in this method. Simulation results validate the effectiveness of the proposed algorithm.

29 citations

Journal ArticleDOI
TL;DR: A new algorithm is presented to indicate ground moving targets in synthetic aperture radar images by the patch-by-patch sharpness comparison of the two defocused images.
Abstract: A new algorithm is presented to indicate ground moving targets in synthetic aperture radar images. Two filters, which differ only in the signs of the phase responses, are used to defocus the complex image respectively. In the two defocused images, each stationary target is blurred to the same extent, but each moving target is blurred to different extents. Therefore, moving targets can be indicated by the patch-by-patch sharpness comparison of the two defocused images. The results of the simulated and real data show that this algorithm is effective and efficient.

28 citations

Proceedings ArticleDOI
18 Sep 2003
TL;DR: In this paper, the first results for the airborne LORA (low-frequency radar) system were presented, which covers operating frequencies in the VHF and UHF bands and has both synthetic-aperture radar and ground moving target indication modes.
Abstract: The paper describes design principles and presents first results for the airborne LORA (low-frequency radar) system. It covers operating frequencies in the VHF and UHF bands and has both synthetic-aperture radar and ground moving target indication modes. The main motivation for the system is to facilitate detection of man-made targets in a wide range of conditions, i.e. stationary or moving targets as well a targets in open terrain or in concealment under foliage or camouflage. The LORA system will operate in several configurations extending from 20 MHz to 800 MHz. Initial flight trials in 2002 were successfully conducted using the 200-400 MHz band. SAR images have been formed from the acquired data and are presented. A second band, 400-800 MHz, has also been completed but has not yet been tested in -flight. A third band, 20-90 MHz, is presently being added and will be completed during 2003. The paper also includes results from a recent experiment in northern Sweden which included an extensive target deployment to cover a broad range of operating conditions. VHF-band SAR (20-90 MHz) is compared with high-resolution Ku-band SAR. Results show the superior area-coverage rate of using VHF-compared to Ku-band for robust detection of stationary targets. The high-resolution images provided by the Ku-band SAR are, however, superior for classification and recognition purposes.© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202327
202272
202131
202052
201966
201859