## Filter Results

Displaying Results 1 - 18 of 18
• ### Cross-correlation performance assessment of global positioning system (GPS) L1 and L2 civil codes for signal acquisition

Publication Year: 2011, Page(s):195 - 203
Cited by:  Papers (5)
| | PDF (840 KB)

Owing to imminent availability of global positioning system (GPS) L2C full constellation, low-cost dual-frequency GPS L1/L2C receivers are likely to appear on the market in the near future. The L1 C/A, L2 CM and L2 CL are the code choices available to combat the near-far problem in such a receiver. The published average cross-correlation protection figures of these codes (C/A: 22 dB, CM: 28 dB a... View full abstract»

• ### Signal fusion-based target detection algorithm for spatial diversity radar

Publication Year: 2011, Page(s):204 - 214
Cited by:  Papers (13)
| | PDF (653 KB)

Signal fusion-based radar target detection algorithms are studied in this article for spatial diversity multiple input multiple output (MIMO) radar based on the generalised likelihood ratio test (GLRT) algorithm, under the assumption that covariance matrices of clutter signals received by different radar sites are different. Two signal fusion-based target detection algorithms are proposed, which c... View full abstract»

• ### Ionosphere-corrected range estimation in dual frequency global navigation satellite systems receivers

Publication Year: 2011, Page(s):215 - 224
Cited by:  Papers (2)
| | PDF (1009 KB)

In global navigation satellite systems (GNSSs), the measurement of the satellite-receiver pseudorange requires the estimation of signal's delay. Because the accuracy of the latter affects significantly the accuracy of the final position, it is essential to consider the effect of various error sources. Ionosphere is commonly regarded as one of the most influential sources because of the fact that i... View full abstract»

• ### Joint sensor localisation and target tracking in sensor networks

Publication Year: 2011, Page(s):225 - 233
Cited by:  Papers (2)
| | PDF (639 KB)

The authors propose a sequential quasi-Monte Carlo (SQMC)-based algorithm for joint estimation of sensor-node locations and target trajectory in a wireless sensor network. The sensor nodes are randomly deployed with no prior knowledge about their positions. A predictive entropy-based information utility is used to select the leader node at each stage, and all other nodes are kept in standby mode t... View full abstract»

• ### Combining the interacting multiple model method with particle filters for manoeuvring target tracking

Publication Year: 2011, Page(s):234 - 255
Cited by:  Papers (9)
| | PDF (1338 KB)

Target tracking is an element of systems that performs tasks such as surveillance, navigation, aviation and obstacle avoidance. It is generally difficult to represent different behavioural aspects of the motion of a manœuvring target with a single model. Therefore multiple model-based approaches are usually required when seeking solutions for manœuvring target tracking problems, whic... View full abstract»

• ### Multiple-input multiple-output radar search strategies for high-velocity targets

Publication Year: 2011, Page(s):256 - 265
Cited by:  Papers (5)
| | PDF (466 KB)

The radar detection of high-velocity targets with a multiple-element antenna array is considered. The detection performance of multiple-input multiple-output (MIMO) radar with orthogonal waveforms is compared with that of a radar using a directed beam. An analytical expression for the probability of detection for a radar with a multiple-element array is derived. For high-velocity targets, the decr... View full abstract»

Publication Year: 2011, Page(s):266 - 278
Cited by:  Papers (10)
| | PDF (1186 KB)

Space-time adaptive processing (STAP) for range-dependent clutter rejection in airborne radar is considered. Indeed, radar antenna architectures or configurations that are different from the conventional uniform linear antenna array (ULA) and side-looking (SL) configuration have consequences on the clutter properties. The authors here investigate the use of Taylor series expansions (TSEs) of the s... View full abstract»

• ### Strategy of doppler centroid estimation in synthetic aperture radar

Publication Year: 2011, Page(s):279 - 287
Cited by:  Papers (7)
| | PDF (886 KB)

Doppler centroid is an important parameter in synthetic aperture radar (SAR) image processing. Owing to measurement uncertainties, many clutter-lock algorithms are proposed to estimate the Doppler centroid. One of the factors that affect the estimation is chirp coupling [linear FM signal is used as transmitting signal in SAR, and this makes echoes of targets from different range bins overlap wit... View full abstract»

• ### Range autofocus for linearly frequency-modulated continuous wave radar

Publication Year: 2011, Page(s):288 - 295
Cited by:  Papers (4)
| | PDF (576 KB)

A software-based method for estimating and compensating for chirp non-linearity in frequency-modulated continuous wave radars is described. The method is based on the phase-gradient algorithm and time-domain warping of the dechirped signal. The method is demonstrated both on typically and severely non-linear chirps. The retrospective application is demonstrated on archive radar data. View full abstract»

• ### Multi-baseline phase unwrapping algorithm based on the unscented kalman filter

Publication Year: 2011, Page(s):296 - 304
Cited by:  Papers (2)
| | PDF (798 KB)

A new multi-baseline phase unwrapping algorithm based on the unscented Kalman filter (UKF) for SAR interferometry is proposed. This method is the result of combining a UKF with a path-following strategy and an omni-directional local phase slope estimator. This technology simultaneously performs noise filtering and phase unwrapping by an optimal data fusion approach. In addition, phase slope will b... View full abstract»

• ### Parametric inverse synthetic aperture radar manoeuvring target motion compensation based on particle swarm optimiser

Publication Year: 2011, Page(s):305 - 314
Cited by:  Papers (19)
| | PDF (477 KB)

Owing to the unknown high-order unstable motion, it is difficult to realise the motion compensation, that is, envelope alignment and phase auto-focusing, for inverse synthetic aperture radar (ISAR) manoeuvring targets. By modelling the envelope shifting and phase modulation into two different high-order polynomial functions against observation time, a novel parametric ISAR motion compensation meth... View full abstract»

• ### Radar detection based on compound-gaussian model with inverse gamma texture

Publication Year: 2011, Page(s):315 - 321
Cited by:  Papers (14)
| | PDF (464 KB)

The coherent radar detection against a background of compound-Gaussian clutter with inverse gamma texture is studied and three detectors: One-step generalised likelihood ratio test (1S-GLRT), maximum a posteriori GLRT (MAP-GLRT) and two-step GLRT (2S-GLRT) are proposed. The detectors have the same structure with their test statistics and modified thresholds, respectively, related to the scale and ... View full abstract»

• ### An adaptive filtering algorithm for blind waveform estimation in diffuse multipath channels

Publication Year: 2011, Page(s):322 - 330
Cited by:  Papers (5)
| | PDF (651 KB)

The use of spatial filtering is considered to isolate a single propagation mode of an unknown narrowband signal received as a superposition of multipath components by a sensor array for the purpose of source waveform estimation. In the problem addressed, multipath propagation from source to receiver occur due to diffuse scattering from a number of distinct but extended regions of an irregular medi... View full abstract»

• ### Performance of knowledge aided space time adaptive processing

Publication Year: 2011, Page(s):331 - 340
Cited by:  Papers (9)
| | PDF (528 KB)

In this study, the asymptotic average signal-to-interference plus noise ratio (SINR) loss of knowledge-aided (KA) space time adaptive processing (STAP) is derived based on the random matrix theory. The authors observe that the desired steering vector and a priori covariance matrix is whitened by the covariance matrix of cell under test. An important result in this study is that one finds the SINR ... View full abstract»

• ### Unambiguous doppler centroid estimation approach for synthetic aperture radar data based upon compressed signal magnitude

Publication Year: 2011, Page(s):341 - 348
Cited by:  Papers (4)
| | PDF (625 KB)

A new approach to Doppler ambiguity resolution is presented. This approach adopts the fact that the absolute Doppler centroid is a linear function of range frequency. Based on this concept, an alternative azimuth compression method that is without a prior knowledge about the motion parameters is developed and carried out in range frequency domain to accumulate the target energy along the azimuth. ... View full abstract»

• ### Exact analytical two-dimensional spectrum for bistatic synthetic aperture radar in tandem configuration

Publication Year: 2011, Page(s):349 - 360
Cited by:  Papers (3)
| | PDF (1020 KB)

An exact analytical solution for the two-dimensional (2-D) point target spectrum is usually difficult to obtain because of the existence of a double-square-root (DSR) term in the bistatic range equation. Some approximate solutions for the 2-D spectrum have been derived and used in order to focus bistatic synthetic aperture data. A geometry-based bistatic formula (GBF) method was used for obtaining... View full abstract»

• ### Sandglass transformation for synthetic aperture radar detection and imaging of ship at low signal-to-clutter-plus-noise ratio

Publication Year: 2011, Page(s):361 - 373
| | PDF (971 KB)

Space/air-borne synthetic aperture radar (SAR) detection and imaging of moving ships at sea are important for ocean reconnaissance and fishery monitoring. A novel algorithm based on sandglass transformation to detect weak ships and form high-quality images under the conditions of low signal-to-clutter-plus-noise ratio is presented here. It requires no prior information about motion parameters of t... View full abstract»

• ### New method for generating site-specific clutter map for land-based radar by using multimodal remote-sensing images and digital terrain data

Publication Year: 2011, Page(s):374 - 388
Cited by:  Papers (2)
| | PDF (1508 KB)

By using multimodal remote-sensing images and digital terrain data of the environment, this study presents a new method for generating the clutter map specific to the selected land radar site and the radar's operating parameters. In the proposed method, the estimation of backscattering from the environment involves extrapolation of the airborne radar remote-sensing image to provide the baseline va... View full abstract»