Analysis of bistatic sea clutter - Part II: Amplitude statistics

Griffiths

2015

This paper discusses the analysis of multistatic micro-Doppler signatures and related features to distinguish and classify unarmed and potentially armed personnel. The application of radar systems to distinguish different motion types has been previously proposed and this work aims to further investigate the applicability of this in more scenarios. Real data have been collected using a multistatic radar system in a series of experiments involving several individuals performing different movements. Changes in classification accuracy as a function of different aspect angle between the direction in which the target faces and the line-of-sight of the radar nodes are analysed. Multiple data fusion methodologies are proposed, showing that significant improvement of the classification accuracy can be achieved when using separate classification at each node followed by a voting procedure to reach the final decision. This is beneficial especially at those aspect angles for which micro-Doppler detection is less favourable.

“…College London and has provided key novel results in the area of bistatic sea clutter characterisation [22][23][24]. NetRAD is a coherent pulsed radar operating at 2.…”

Section: Data Collection and Experimental Setupmentioning

confidence: 99%

Aspect angle dependence and multistatic data fusion for micro‐Doppler classification of armed/unarmed personnel

Griffiths

2015

“…The first system is the S-band multistatic pulsed coherent system NetRAD. NetRAD has been developed over a number of years at University College London [27] and has provided novel results in different research fields such as sea clutter characterisation and human micro-Doppler [28][29][30]. NetRAD has three distinct but essentially identical nodes, one of which is used as a monostatic transceiver (node 3) and the other two as receiveonly nodes (node 1 and node 2).…”

Section: Radar Systems and Measurement Setupmentioning

confidence: 99%

Experimental analysis of multistatic multiband radar signatures of wind turbines

Balleri

et al. 2016

This paper presents the analysis of recent experimental data acquired using two radar systems at Sband and X-band to measure simultaneous monostatic and bistatic signatures of operational wind turbines near Shrivenham, UK. Bistatic and multistatic radars are a potential approach to mitigate the adverse effects of wind farm clutter on the performance of radar systems, which is a well-known problem for Air Traffic Control and Air Defence radar. This analysis compares the simultaneous monostatic and bistatic micro-Doppler signatures of two operational turbines and investigates the key differences at bistatic angles up to 23°. The variations of the signature with different polarisations, namely VV and HH, are also discussed.

“…A comparative analysis of fitting five different distributions to bistatic clutter data can be found in [4], where the KA was reported to provide the best fit for most of the datasets. A detailed analysis of experimental sea clutter data collected by the monostatic X-band McMaster University IPIX radar has been presented in [23], where the validity of non-Gaussian clutter models using K…”

Section: Analysis Of Amplitude Statisticsmentioning

confidence: 99%

“…The estimator based on the mean of the logarithm of the data in equation (4) has been extended to take into account the effect of thermal noise, either proposing suitable numerical methods to obtain a value of the shape parameter [31], or developing a closed-form of the estimator when more than a single pulse are non-coherently integrated together [29]. Moment matching approach has been also used, for instance estimating the second, fourth, and sixth moment as in [23], or exploiting the knowledge of the noise power PN as in equation (6), where the first and second moment of the intensity of the clutter plus noise data are used, as reported in chapter 5 and 13 of [15] and in [22,31].…”

Section: Analysis Of Amplitude Statisticsmentioning

confidence: 99%

Analysis of polarimetric bistatic sea clutter using the NetRAD radar system

Griffiths

et al. 2016

This paper presents a comparative analysis of amplitude and Doppler spectra statistics from monostatic and bistatic sea clutter data at S-band. These data cover a range of bistatic angles from 60° to 120° and include simultaneous monostatic and co-polarized and cross-polarized bistatic recordings, providing direct comparison of their statistical properties. The time series of amplitude data are fitted to the compound K and K+Noise distribution in the range domain and in the Doppler domain, and the variation of the shape parameter is presented for monostatic and co-polarized and cross-polarized bistatic data as an indication of the spikiness of the clutter. From the analysis of this parameter it is shown that cross-polarized bistatic data tend to be less spiky in the range and Doppler domain than the simultaneous co-polarized bistatic data, and than the simultaneous monostatic data, which could be advantageous in terms of radar detection performance, especially for low-visibility maritime targets.