| Generating Correlated Gamma Sequences for Sea-Clutter Simulation |
Mar 2012 |
33 pages |
| Authors:
Yunhan Dong; Luke Rosenberg; Graham V Weinberg; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA)
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 | This report presents a hybrid method for simulating sequences of correlated Gamma random variables for modelling sea clutter, using a combination of linear and/or non-linear transforms. Depending on the shape parameter, this method minimises the use of non-linear transformations. Mathematically the method is simpler than its counterpart methods which leads to a quicker simulation run time. Two memoryless non-linear transform (MNLT) approaches are also studied with comparative results showing that ... |
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| Analysis of L-band Multi-Channel Sea Clutter |
Aug 2010 |
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| Authors:
Yunhan Dong; David Merrett; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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 | An L-band multi-channel sea clutter trial was conducted using a DSTO-built 16-channel receiving array (called XPAR) in May 2008 at Kangaroo Island, South Australia. This report presents a number of calibration techniques and analyses various properties of sea clutter including backscatter coefficient, spatial and temporal correlations, distributions and Doppler spectra. Observed phenomena are explained. |
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| Phased Array Radar Data Processing Using Adaptive Displaced Phase Centre Antenna Principle |
DEC 2007 |
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| Authors:
Yunhan Dong; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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| Employing the autoregressive (AR) technique and the principle of displaced phase centre antenna (DPCA) we construct an optimum adaptive DPCA processor for moving target detection from airborne phased arrary radar data collected under non- DPCA conditions. It is fundamentally different from the existing adaptive DPCA which is not optimum. The number of range samples it needs to estimate its parameters is only approximately twice the number of antenna elements, significantly ... |
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| High Grazing Angle and High Resolution Sea Clutter: Correlation and Polarisation Analyses |
Mar 2007 |
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| Authors:
Yunhan Dong; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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| Spatial and temporal correlations of high grazing angle high resolution sea clutter collected by the DSTO Ingara polarimetric X-band system are studied. It seems that wavelengths of wind waves and swells are retrievable from the range correlation whereas the periods of the waves and swells are recoverable from the azimuthal correlation. The polarimetric behavior of sea clutter is also studied, and it is found that the Bragg scattering is the ... |
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| Distribution of X-Band High Resolution and High Grazing Angle Sea Clutter |
JUL 2006 |
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| Authors:
Yunhan Dong; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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| This report studies the spatial distribution of X-band, high resolution and high grazing angle polarimetric sea clutter data. The K distribution usually provides a good fit for the distribution of the VV polarised data. The HH polarised data is spikiest and its distribution exhibits a sudden departure from the K distribution in the tail region, which usually requires the KA or the similar distributions to achieve a better fit in ... |
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| Parametric Adaptive Matched Filter and its Modified Version |
MAY 2006 |
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| Authors:
Yunhan Dong; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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| The parametric adaptive matched filter (PAMF) for space-time adaptive processing (STAP) has been an interesting research area in the airborne radar data processing community over the last decade. Starting from providing a complete formulation of PAMF, this report assesses the performance of PAMF using simulated data as well as real airborne data collected by the Multi-channel Airborne Radar Measurements (MCARM) system with use of results from the conventional STAP as ... |
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| Evaluation of Pre-Built Space-Time Non-Adaptive Processing (PSTAP) |
JUL 2005 |
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| Authors:
Yunhan Dong; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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| Pre-built space-time non-adaptive processing (PSTAP) has been proposed in a previous DSTO report. This report further examines the performance of PSTAP using simulated airborne radar data generated by the Rome Laboratory Space-Time Adaptive Processing (RLSTAP) software. Results from the conventional STAP diagonally loaded sample matrix inversion (DL-SMI) method are used as benchmarks to evaluate results of PSTAP. It is found that PSTAP performs the same as STAP. Most importantly, PSTAP ... |
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