## Filter Results

Displaying Results 1 - 13 of 13
• ### Optimal coherent radar detection in a K-distributed clutter environment

Publication Year: 2012, Page(s):283 - 292
Cited by:  Papers (10)
| | PDF (339 KB)

An optimal detector in the sense of generalised likelihood ratio test (GLRT) for coherent radar detection in a compound K-distributed clutter environment is re-studied in detail. A few properties of the detector are derived showing potential of its implementation in radar systems. To the optimal detector, sea spikes (abnormally high radar returns from the sea surface) are unlikely to trigge... View full abstract»

• ### Fractal characteristic in frequency domain for target detection within sea clutter

Publication Year: 2012, Page(s):293 - 306
Cited by:  Papers (9)
| | PDF (1385 KB)

This study mainly describes the fractal property of the frequency spectrum of the sea clutter and the application of the obtained fractal characteristic in frequency domain to the constant-false-alarm-rate (CFAR) target detection within sea clutter. First, this study takes fractional Brownian motion (FBM) for example, and the spectrum of the FBM is proved to be fractal theoretically on condition t... View full abstract»

• ### Two-dimensional direction of arrival estimation by exploiting the symmetric configuration of uniform rectangular array

Publication Year: 2012, Page(s):307 - 313
Cited by:  Papers (2)
| | PDF (447 KB)

In this study, a new two-dimensional direction of arrival (2D DOA) estimation method is proposed for a uniform rectangular array (URA). The impinging signals are a mixture of uncorrelated and coherent signals. The method consists of two steps. The DOAs of uncorrelated signals are first estimated by a modified 2D estimation of signal parameters via rotational invariance techniques (ESPRIT). Then th... View full abstract»

• ### New waveform for magnetron marine radar - experimental results

Publication Year: 2012, Page(s):314 - 321
Cited by:  Papers (2)
| | PDF (731 KB)

The unambiguous range of a pulse-radar is related to the pulse repetition interval (PRI). Most magnetron-based marine radars adjust the PRI according to the maximum displayed range. They correspondingly adjust the pulse-width (PW) to keep the ratio PW/PRI nearly constant. The extreme settings can be described as short pulse, short PRI (SPSP) for short distances and long pulse, long PRI (LPLP) ... View full abstract»

• ### Automatic modulation classification of radar signals using the Rihaczek distribution and hough transform

Publication Year: 2012, Page(s):322 - 331
Cited by:  Papers (8)
| | PDF (587 KB)

It is an important work to classify the modulation type of the intercepted radar signal for an electronic intelligence (ELINT) receiver in a non-cooperative environment. The authors use the Rihaczek distribution (RD) and the Hough transform (HT) to concentrate the energy in time-frequency plane and derive two new characteristic features, namely the ratio of the minimum to the maximum of the HT and... View full abstract»

• ### ISAR based techniques for refocusing non-cooperative targets in SAR images

Publication Year: 2012, Page(s):332 - 340
Cited by:  Papers (24)
| | PDF (922 KB)

Non-cooperative moving targets typically appear defocused in synthetic aperture radar (SAR) images as they are non-stationary during the coherent processing interval. Typically, the problem of refocusing moving targets in SAR scenes is addressed as a problem of the target's motion estimation and compensation. In this study, the problem is addressed as a problem of non-cooperative target imaging an... View full abstract»

Publication Year: 2012, Page(s):341 - 347
Cited by:  Papers (4)
| | PDF (210 KB)

During the operation of the multifunction radar system, all the tasks related to the functions of the radar must be launched. The key element of the radar responsible for managing all these tasks is the task scheduler. Many scheduling techniques give good results at the expense of too complex and expensive designs. This study presents the results of a model for a radar task scheduler to achieve bo... View full abstract»

• ### Signal mode and imaging algorithn for spaceborne interrupted continuous-wave synthetic aperture radar

Publication Year: 2012, Page(s):348 - 358
Cited by:  Patents (1)
| | PDF (836 KB)

Microsatellites have been developed with onboard equipments to monitor and detect early signs of natural disasters and man-caused destructing emergencies. Continuous-wave (CW) synthetic aperture radar (SAR) system operates at constant low-peak transmission power which offers smaller size and lower cost, and this quality provides an appropriate option for microsatellites in remote-sensing fields th... View full abstract»

• ### Gaussian mixtures in multi-target tracking: a look at gaussian mixture probability hypothesis density and integrated track splitting

Publication Year: 2012, Page(s):359 - 364
Cited by:  Papers (6)
| | PDF (263 KB)

Multi-target tracking in clutter, assuming linear target trajectory propagation and linear target measurement equation, naturally leads to a Gaussian mixture (GM) target tracking solution. This study examines and compares two prominent methods that use the GMs: the probability hypothesis density and the integrated track splitting. Both are recursive Bayes methods and both incorporate the false tra... View full abstract»

• ### Generic multisensor multitarget bias estimation architecture

Publication Year: 2012, Page(s):365 - 378
Cited by:  Papers (4)
| | PDF (797 KB)

Current bias estimation algorithms for air traffic control (ATC) surveillance are focused on radar sensors, but the integration of new sensors (especially automatic dependent surveillance-broadcast and wide area multilateration) demands the extension of traditional procedures. This study describes a generic architecture for bias estimation applicable to multisensor multitarget surveillance systems... View full abstract»

• ### Some results on characteristics of bistatic high-range resolution profiles for target classification

Publication Year: 2012, Page(s):379 - 388
Cited by:  Papers (5)
| | PDF (874 KB)

This study focuses on the bistatic high-range resolution profiles (HRRPs) of high-speed and manoeuvring targets and considers how to utilise the length of the bistatic HRRP for target classification. The bistatic HRRP of a high-speed and manoeuvring target is obtained via stretch processing and motion compensation, and its distortion caused by target translation is analysed quantitatively. It is d... View full abstract»

• ### Adaptive fractional fourier transform-based detection algorithm for moving target in heavy sea clutter

Publication Year: 2012, Page(s):389 - 401
Cited by:  Papers (32)
| | PDF (1015 KB)

Attention has been focused on the moving target detection in heavy sea clutter. On the basis of detection model of moving target with fluctuant amplitudes, a novel adaptive algorithm in fractional Fourier transform (FRFT) domain is proposed, which combines statistic-based and FRFT-based detection method. FRFT has good energy concentration property on linear frequency modulation (LFM) signal with t... View full abstract»

• ### Ultra wideband indoor navigation system

Publication Year: 2012, Page(s):402 - 411
Cited by:  Papers (14)
| | PDF (767 KB)

Typical indoor environments contain multiple walls and obstacles consisting of different materials. As a result, current narrowband radio frequency (RF) indoor navigation systems cannot satisfy the challenging demands for most indoor applications. The RF ultra wideband (UWB) system is a promising technology for indoor localisation owing to its high bandwidth that permits mitigation of the multipat... View full abstract»