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Time Domain Modelling Of Ocean Clutter For Ground Wave Radar
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Book Synopsis Time-domain Modelling of Ocean Clutter for Ground Wave Radar by :
Download or read book Time-domain Modelling of Ocean Clutter for Ground Wave Radar written by and published by . This book was released on 1989 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detection performance of high frequency ground wave (HFGW) radar systems, for over-the-horizon detection of surface targets, is limited by the back scattering returns from the ocean surface. An improved modelling of the ocean clutter is the key to enhanced target detection with HFGW radar; this would enable clutter suppression techniques to be refined and a higher signal-to-noise ratio to be achieved. This paper proposes a wave packet model for the dominant components of the ocean back scattering signal and suggests a technique to exploit this non-stationary characteristic of the ocean clutter to improve target detection performance. The technique is based on the Wigner-Ville distribution, which is an emerging tool for non-stationary spectral analysis. Results are presented to demonstrate the enhanced detection performance of the proposed technique.
Book Synopsis Time Domain Analysis of Ocean Clutter in High Frequency Radar by :
Download or read book Time Domain Analysis of Ocean Clutter in High Frequency Radar written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: High frequency (HF) radar has the unique potential for over-the horizon detection of ocean surface targets. However, ocean waves are also strong reflectors for HF radar and this high clutter level has limited its application for target detection. This paper describes further detailed investigations of the time-varying behaviour of the ocean clutter and shows that the clutter can be modelled by two narrowband signals, with time-carrying frequencies, centred around the two `Bragg' frequencies. It also describes how, in the presence of a target signal, simple time-domain processing may be used to selectively suppress the dominant clutter signals.
Book Synopsis Development of a Model for the First Order Bistatic Ocean Clutter Radar Cross Section for Ground Wave Radars by :
Download or read book Development of a Model for the First Order Bistatic Ocean Clutter Radar Cross Section for Ground Wave Radars written by and published by . This book was released on 1994 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the development of a theoretical model for the bi-static back-scattered Doppler radar cross-section of the ocean surface, for the first-order or Bragg scatter component only. The report begins with some basic scattering theory, and equations for radar cross-section are compared with previously available theory. In the development of the model, a narrow beam receive system is assumed, as well as static receiver and transmitter locations. The radar cross-section of the ocean is derived in the ensemble average sense in that no effort is made to incorporate statistical variations in the ocean surface model or statistical variations in the received ocean clutter signal. Some typical results from the model are presented and briefly discussed.
Book Synopsis Radar Sea Clutter by : Luke Rosenberg
Download or read book Radar Sea Clutter written by Luke Rosenberg and published by IET. This book was released on 2021-12-17 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents comprehensive coverage of new research into sea clutter characterisation and modelling, radar performance prediction and maritime target detection. The book also includes a summary of sea-clutter scattering characteristics and datasets provided that can be used for modelling.
Book Synopsis Ocean-clutter Model for High-frequency Radar by :
Download or read book Ocean-clutter Model for High-frequency Radar written by and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inverse problem of extracting the ocean wave-length spectrum from the high-frequency (HF) radar clutter signal involves inventing a nonlinear integral equation. The strong ocean-clutter signal also eliminates the application of HF radar to target detection. This paper describes a detailed investigation of the time-varying behaviour of the ocean clutter and shows that the ocean-clutter can be modeled by two narrowband signals, with time-varying frequencies, centred around the two Bragg frequencies. It is demonstrated that the spectrum of such an angle-modulated signal agrees closely with the spectrum of HF radar data and accounts for the characteristics corresponding to both the first- and second-order scattering peaks.
Download or read book Sea Clutter written by Keith D. Ward and published by IET. This book was released on 2006-06-21 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sea Clutter: Scattering, the K Distribution and Radar Performance examines the statistics of radar scattering from the sea surface in terms of their relevance to radar operating in a maritime environment; including remote sensing, surveillance and targeting applications. A lot of the work in the book is based on the compound Kdistribution model for the amplitude statistics of sea clutter. In addition, the book addresses the specification of performance required by customers and the measurement of performance of systems supplied to customers.
Book Synopsis Suppression of Ocean Clutter in High Frequency Radar by :
Download or read book Suppression of Ocean Clutter in High Frequency Radar written by and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strong ocean clutter levels restrict the target detection capabilities of high frequency (HF) radar. A recently-proposed time-domain model for the ocean clutter may be used to selectively suppress the clutter component and enhance the target detection performance. This paper discusses some techniques in the practical implementation of clutter suppression, based upon this model, and presents initial results.
Book Synopsis Proceedings of the Eighth International Conference on Offshore Mechanics and Arctic Engineering, 1989: Arctic and polar technology by :
Download or read book Proceedings of the Eighth International Conference on Offshore Mechanics and Arctic Engineering, 1989: Arctic and polar technology written by and published by . This book was released on 1989 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering by :
Download or read book Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering written by and published by . This book was released on 1989 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conference Proceedings written by and published by . This book was released on 1990 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oceans '90 Conference Proceedings by :
Download or read book Oceans '90 Conference Proceedings written by and published by . This book was released on 1990 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chaotic Dynamics of Sea Clutter by : Simon Haykin
Download or read book Chaotic Dynamics of Sea Clutter written by Simon Haykin and published by Wiley-Interscience. This book was released on 1999-08-02 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chaotic dynamics of sea clutter boasts important applications in a number of fields, including weather radar systems, which are intensely studied at major universities. This book presents a detailed account of chaotic dynamics of sea clutter, using real-life sea clutter data rather than simulated data, and drawing on eight years of research by one of the most highly regarded researchers in this area.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991 with total page 1150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Report on Ground-wave-radar Sea Clutter by : Charles Adolphus Stutt
Download or read book Preliminary Report on Ground-wave-radar Sea Clutter written by Charles Adolphus Stutt and published by . This book was released on 1956 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BMT Abstracts written by and published by . This book was released on 1989 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Segmented Wave Sea Clutter Modelling in Littoral Environments by : Manfred Dieter Strempel
Download or read book Segmented Wave Sea Clutter Modelling in Littoral Environments written by Manfred Dieter Strempel and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation a combination of numerical and statistical methods are used to analyse and model periodic breaking ocean wave radar data in a littoral coastal zone. Analysis, based primarily on post-aligned parallel breaking waves, is considered for this research. Measurement data, obtained from the CSIR, is used to parametrise the model variables. Returns are corrected against the incoming wave angle, with respect to the radar, through a Radon transform analysis followed by a data alignment correction step. This ensures that the periodic breaking waves are then parallel to the time axis. The assumption is made that the fractional change in grazing angle has negligible effects on the clutter statistics. Subsequently statistical analysis is performed on the angular corrected measured data. Several different segments of a breaking wave are independently considered and analysed in terms of their distribution and correlation properties. Statistical results show that the best fitting distribution is a function of the sub-section of the sea wave and a function of the noise floor of the measuring radar. This is in part due to the radar signal not being able to reflect between the troughs of an ocean wave, because of the low grazing angle. Crest sections of an ocean wave tend to be distributed according to Rayleigh and K-distributions. After data processing, statistical parameters are obtained, which allows for the successful simulation of statistically similar periodic breaking wave range-time clutter data. Angular data is captured for post skewing of the approaching ocean waves. Statistical correlation times and distribution parameters are analysed and recorded for use in the data generation process. Further datasets containing small rigid inflatable boats crossing the sea wave crest are compared with pure sea clutter datasets and discussed. Influences on the Radon transform and the resulting effects are also discussed. Based on these models, methods and simulations, future work will include using the resultant model to develop improved detection algorithms, which measure and detect small targets in periodic breaking waves in littoral coastal zones. This could lead to integrating environmental wave structures, which may be independently tracked and categorised, into the algorithm design and ultimately lead to improving small vessel detection using low grazing angle coastal ground radar through classification.
