72 research outputs found
A gain/phase and mutual coupling calibration algorithm for GPS antenna array in the presence of multipath
No full textZii Xu, Matthew Trinkle, Doug A. Gra
Two-stage DOA estimation of independent and coherent signals in spatially coloured noise
No full textAbstract not availableYuexian Wang, Matthew Trinkle, Brian W. -H. N
Adaptive antenna arrays in RFID
No full textM. Trinkle and B. Jamalihttp://trove.nla.gov.au/work/3707243
Quickest detection of GPS spoofing attack
No full textGPS is being increasingly used in critical infrastructures in modern society. Therefore, the reliability of GPS is extremely important. Recently, the vulnerability of GPS to a spoofing attack has been discussed in the literature. A malicious attacker may spoof a GPS receiver, causing it to provide incorrect navigation and timing information, which may lead to serious damage. Therefore, it is extremely important to detect spoofing attacks as quickly as possible. In this paper, we propose a quickest spoofing detection algorithm to combat GPS spoofing attacks. The experimental results demonstrate that the proposed algorithm can effectively detect the spoofing attack quickly after it occurs.Zhenghao Zhang, Matthew Trinkle, Lijun Qian and Husheng L
Fast-time STAP performance in pre and post range processing adaption as applied to multichannel SAR
No full textHot-clutter cancellation using fast-time Space Time Adaptive Processing (STAP) can occur either pre or post range processing (RP) and to date, there has not been a direct comparison on which method offers the best results. This paper provides an analytic comparison which is verified with simulation and aims to provide insight into the location of the adaptive filter which would provide the best hot-clutter suppression. The covariance models are tested with signal models used in a multichannel Synthetic Aperture Radar (SAR).Luke Rosenberg, Matthew Trinkle, Doug Gra
DOA estimation under unknown mutual coupling and multipath with improved effective array aperture
No full textSubspace-based high-resolution direction of arrival (DOA) estimation significantly deteriorates under array manifold perturbation and rank deficiency of the covariance matrix due to mutual coupling and multipath propagation, respectively. In this correspondence, the unknown mutual coupling can be circumvented by the proposed method without any passive or active calibration process, and the DOA of the coherent signals can be accurately estimated accordingly. With a newly constructed matrix, the deficient rank can be restored, and the effective array aperture can be extended compared with conventional spatial smoothing. The proposed method achieves a good robustness and DOA estimation accuracy with unknown mutual coupling. The simulation results demonstrate the validity and efficiency of the proposed method.Yuexian Wang, Matthew Trinkle and Brian W.-H. N
Automatic detection and removal of disfluencies from spontaneous speech
No full textUnlike rehearsed and prepared speech, spontaneous speech contains high occurrence of disfluencies, like repetitions, filled pauses, and hesitations. Disfluencies can seriously hamper the word recognition accuracy of an Automatic Speech Recogniser (ASR), by increasing word insertion and deletion and rejection rates. In this paper we introduce signal processing algorithms to automatically identify and remove repetitions and filled pauses from spontaneous speech before passing it to an ASR for transcription. The algorithms are tested with Dragon NaturallySpeaking Speech Recogniser and show significant improvements in the word recognition accuracy, and ensuing reductions in substitution and deletion and insertion errors.Mayank Kaushik, Matthew Trinkle and Ahmad Hashemi-Sakhtsar
Zero-IF receivers for phased array radars
No full textCopyright © 2008 IEEEThis paper considers the suitability of zero-IF receivers for inclusion into the transmit/receive (T/R) modules in modern phased array radars. The main performance measures are the overall system dynamic range and tuning range. The achievable dynamic range is estimated based on currently available components and compared against the results of a prototype system. The overall results indicate that a dynamic range of more than 60 dB is achievable in a 50 MHz bandwidth.Matthew Trinkle and Joy L
Efficient DOA estimation of noncircular signals in the presence of multipath propagation
No full textThe noncircularity of uncorrelated signals can improve the performance of direction of arrival (DOA) estimation using antenna arrays. However, due to reflection from surfaces or malicious jamming, the received noncircular signals may be a mixture of uncorrelated and coherent components in practice, which has not been considered by existing algorithms. This paper addresses the issue of DOA estimation for noncircular signals under multipath fading in smart antenna systems, and a novel two-stage processing method is proposed accordingly. By expanding the signal subspace from augmented array output, the DOA estimates of uncorrelated sources are first obtained, and then the covariance matrix of uncorrelated signals is reconstructed and removed from that of the mixed signals afterwards. Secondly, a spatial smoothing technique is performed on a denoised covariance to restore rank deficiency in the covariance of the remaining coherent signals. The resultant algorithm can resolve more signals than array elements with higher accuracy and better classification of signal type than previous methods. Additionally, a new deterministic direction estimation Cramér–Rao lower bound (CRLB) is derived for the considered mixture model. Simulation results demonstrate the validity and efficiency of the proposed method.Yuexian Wang, Matthew Trinkle, Brian W.-H. N
Ku-Band Phased Array Reflector Array for Bistatic Radar Experiments
No full textThis paper describes the design of Ku-band 16 element parabolic trough reflector antenna suitable for bistatie radar experiments using geo-stationary satellite TV signals. The array can steer electronically in azimuth and mechanically in elevation. The test results from a smaller four element model trough array are also presented. © 2008 IEEE.Cooke P., Trinkle M., Hansen H. and Palmer, J.http://trove.nla.gov.au/work/3188839
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