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The objective of this work is to develop optimal polarimetric Constant False Alarm Rate (CFAR) ship detection system. Polarimetric transformation/decompositions, clutter analysis, modeling, Principal Component Analysis (PCA), and multi-CFAR detection are the necessary components of optimal polarimetric CFAR ship detectors. The resulting CFAR detector outperforms the conventional polarimetric CFAR...
Chaff, a typical passive deceivable interference, is commonly used to cheat radar reconnaissance by producing high fidelity echoes in military counter-mission. It is difficult and challenging to distinguish chaff from ship based on their echoes. Firstly a sparseness characteristic analysis is implemented about ship and chaff return in time-domain and frequency-domain, respectively, which conclude...
Australia has been developing and fielding phased array applications since the early 1950s. The application areas range from radio astronomy and atmospheric sciences, through over-the-horizon radar, surface wave, microwave ship and airborne systems. Given Australia's unique geographical size, position, single continent and national identity, it is not surprising that much of this effort has been focussed...
The integration of current traffic monitoring operational systems in the field of maritime surveillance is widely acknowledged as a key requirement for borders control and illegal trafficking prevention. In this paper, an overview of the satellite-extended-vessel traffic service (SEV) system for in-situ and earth observation (EO) data association is presented. The description of the cognitive data...
In this paper a technique for cross-range scaling of an ISAR image is proposed. Two suitable rows si and sj, relative to the i-th and j-th range bin, are extracted from the range compressed hologram. Then a proper functional G(d(t)), where d(t) is the target rotation law, is evaluated on the complex vector hequiv[h1 h2...hns]T, with hk=s*iksjk and k=1, ..., ns, such that its maximization leads to...
This paper deals with the problem of automatic target recognition (ATR) of non cooperative targets. Specifically the focus is on the ATR of ships in ISAR images. To fulfill this task a multifeature based technique is proposed which uses a number of features extracted from the ship radar image. Both cases of known/unknown target aspect angle and single/multiframe based processing technique are considered...
Entropy (H)/ Alpha (alpha)/ Anisotropy (A) polarimetric features are largely employed in polarimetric SAR for supervised and/or unsupervised land classification. Can these features be exploited for classifying man-made targets? This paper answers this question by proposing: 1) A technique for extracting H/alpha/A parameters from High Resolution Range Profiles (HRRP) of the target 2) A MAP classifier...
This paper presents a study of the effects of sea clutter on the performance of HF surface wave radar (HFSWR), operating in the band between 3 and 5 MHz, in the detection of two classes of ships: large freighters with gross registered tonnage (GRT) in the order of several tens of thousands of tons and small vessels with a GRT of about 1000 tons. The radar returns from both large and small ships are...
A SAR system with an antenna divided into sub-apertures is considered for marine surveillance. Ship position and radial and along-track components of its cruising velocity are estimated in the presence of wave-induced motion, using a combination of adaptive beamforming, frequency tracking and along-track interferometry. The effectiveness of this new approach is illustrated by an airborne SAR example...
A novel technique for estimation and compensation of radar target translational motion is presented. Its theoretical derivation and its application to real radar data for different classes of targets (ships, aircrafts) are discussed. The proposed algorithm is based on a closed-loop processing chain, that processes groups of received pulses carrying out a frequency-domain analysis to estimate the target...
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