By Topic

## Filter Results

Displaying Results 1 - 12 of 12
• ### Conjugate directions based order recursive implementation of post-Doppler adaptive target detectors

Publication Year: 2012, Page(s):577 - 586
Cited by:  Papers (1)
| | PDF (551 KB)

An implementation for the post-Doppler adaptive target detectors enabling an efficient change of the subspace dimension is described. The proposed implementation uses the order recursive structure of the conjugate directions method and does not present any additional computational burden on the processor. The implementation can be particularly useful for the adaptive detectors with an indeterminat... View full abstract»

• ### Grating lobe control in randomised, sparsely populated MIMO radar arrays

Publication Year: 2012, Page(s):587 - 594
Cited by:  Papers (4)
| | PDF (643 KB)

Randomisation of element positions in a sparsely populated, non-uniform antenna array is a well-known approach in communication systems for controlling grating lobes and allowing improved spatial resolution for a given number of antenna elements. MIMO array techniques have been applied more recently to radar systems with a view to improving the versatility and performance, particularly angular res... View full abstract»

• ### Weighted average frequency algorithm for Hilbert-Huang spectrum and its application to micro-Doppler estimation

Publication Year: 2012, Page(s):595 - 602
Cited by:  Papers (3)
| | PDF (814 KB)

For micro-Doppler estimation, an innovative Hilbert-Huang transform (HHT)-based instantaneous frequencies estimator approach designated as weighted average frequency algorithm (WAFA) is proposed in this study. The algorithm is a smoothing of adjacent instantaneous frequencies with a normal rectangular window. After achieving Hilbert-Huang spectrum of the signal, weighted average frequencies and am... View full abstract»

• ### Receivers' positioning in multiple-input multiple-output digital video broadcast-terrestrial-based passive coherent location

Publication Year: 2012, Page(s):603 - 610
Cited by:  Papers (3)
| | PDF (399 KB)

Using multiple illuminators of opportunity at the transmit side and multiple antennas at the receiver side in a passive coherent location (PCL) scheme is expected to improve the detection performance. However, in such multiple-input multiple-output (MIMO) configuration choosing the position of the receivers is an obstacle that can have significant influence on the resulting performance. In this st... View full abstract»

• ### Combination of squared correlators for multipath mitigation in safety-of-life global navigation satellite systems receivers

Publication Year: 2012, Page(s):611 - 619
Cited by:  Papers (4)
| | PDF (854 KB)

This study presents a novel solution of DLL discrimination function for multiband global navigation satellite systems (GNSS) receivers, designed to cope with a multipath-prone environment in safety-of-life (SoL) applications. The solution is based on a combination of squared correlators (CSC) outputs, following an approach similar to that driving to the well-known, and patented, Strobe... View full abstract»

• ### Interpolation method for geometric correction in highly squint synthetic aperture radar

Publication Year: 2012, Page(s):620 - 626
Cited by:  Papers (3)
| | PDF (472 KB)

In this study, a two-dimensional (2D) sinc interpolation method is proposed to carry out the geometric correction in highly squint synthetic aperture radar (SAR). The point spread function (PSF) has 2D non-perpendicular sidelobes in highly squint SAR. This kind of sidelobes may result in the folded skewed spectrum. The conventional interpolation methods cannot do the geometric correction for slant... View full abstract»

• ### Entropy-based motion error correction for high-resolution spotlight SAR imagery

Publication Year: 2012, Page(s):627 - 637
Cited by:  Papers (7)
| | PDF (866 KB)

Spotlight synthetic aperture radar (SAR) is an effective way to obtain finer azimuth resolution than the achievement in strip-map mode with the same physical antenna. In general, for spotlight SAR imaging, high azimuth resolution requires long synthetic aperture length. However, in practical airborne applications, because of the inevitable atmospheric turbulence during the long flight trajectory, ... View full abstract»

• ### Cramer-Rao bounds of direction-of-arrival and distance estimation of a near-field incident source for an acoustic vector sensor: Gaussian source and polynomial-phase source

Publication Year: 2012, Page(s):638 - 648
Cited by:  Papers (1)
| | PDF (845 KB)

The near-field array manifold of the acoustic vector sensor was recently derived by Wu et al [see the acoustic vector sensors near-field array manifold` in IEEE Trans. Signal Process.]. The CraméŕRao bounds (CRBs) of direction-of-arrival and distance estimation with a single pure tone were also derived therein. This study aims to investigate the estimation accuracy ... View full abstract»

• ### Evidence theory-based mixture particle filter for joint detection and tracking of multiple targets

Publication Year: 2012, Page(s):649 - 658
| | PDF (593 KB)

In this study, a novel algorithm named evidence theory-based mixture particle filter is proposed for joint detection and tracking for a varying number of targets in a cluttered environment. The posterior distribution of multiple target state considered in single target state space is a multi-modal distribution with each mode corresponding to either a target or clutter. A general global posterior d... View full abstract»

• ### Extending the unambiguous range of polyphase P4 CW radar using the robust symmetrical number system

Publication Year: 2012, Page(s):659 - 667
Cited by:  Papers (7)
| | PDF (735 KB)

Polyphase continuous waveform radar systems often use polyphase P4 modulation because of the periodic autocorrelation zero sidelobes and good Doppler tolerance. The P4's unambiguous detection range is equal to the number of subcodes within a code period. To extend the unambiguous detection range beyond a single-code period, this study develops a novel relationship between the polyphase P4 code and... View full abstract»

• ### Ambiguity function and Cramer-Rao bounds for universal mobile telecommunications system-based passive coherent location systems

Publication Year: 2012, Page(s):668 - 678
Cited by:  Papers (19)
| | PDF (596 KB)

The concerns are with the calculation of monostatic and bistatic ambiguity function (AF) of a quadrature phase shift keying (QPSK) signal where the pulses are shaped with a root raised cosine (RRC) filter. The monostatic and bistatic modified Craméŕ-Rao lower bounds (MCRLBs) for the estimation of target range and velocity are also derived and analysed. The QPSK modulation is used i... View full abstract»

• ### Direction of arrival estimation for monostatic multiple-input multiple-output radar with arbitrary array structures

Publication Year: 2012, Page(s):679 - 686
Cited by:  Papers (4)
| | PDF (548 KB)

Compared with other systems with a single transmit antenna, multiple-input multiple-output (MIMO) radar systems have additional degrees of freedom that can enhance space resolution, improve parameter identifiability and enhance flexibility for transmit beam pattern design. The computational complexity for direction of arrival (DOA) estimation using sensor arrays increases very rapidly with the num... View full abstract»