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On interval clutters

Guoli Ding
2002 Discrete Mathematics  
In this paper, we strengthen Tucker's result for clutters by characterizing interval clutters in terms of excluded partial clutters, as well as excluded minors.  ...  A hypergraph is an interval hypergraph if its vertices can be linearly ordered so that all its edges are consecutive sets. Interval hypergraphs have been characterized by Tucker (J. Combin.  ...  Consequently, if A contains no vertices on the left of A 1 , J must have vertices on the right of A 2 , for otherwise H is an interval clutter (by putting all vertices of A − A 2 on the right of A 2 ).  ... 
doi:10.1016/s0012-365x(01)00354-5 fatcat:cqch32gyebegphmcpy6mwimrze

Parameter Estimation for Sea Clutter Pareto Distribution Model Based on Variable Interval

Yifei Fan, Duo Chen, Mingliang Tao, Jia Su, Ling Wang
2022 Remote Sensing  
Considering the local properties of sea clutter, we take a variable interval of the entire sea clutter series for parameter estimation, where the interval position is selected according to the sea state  ...  To improve the parameter estimation accuracy, this paper proposes a novel parameter estimation method based on variable intervals.  ...  The sea clutter series in the interval can be defined as: X = x (L 1 ) , x (L 1 +1) , . . . , x (L 2 −1) , x (L 2 ) (20) Parameter estimation based on variable interval.  ... 
doi:10.3390/rs14102326 fatcat:hxkbxrzmg5gcpkpiz63qolwt4i

ADAPTIVE CLUTTER SUPPRESSION FOR AIRBORNE RANDOM PULSE REPETITION INTERVAL RADAR BASED ON COMPRESSED SENSING

Zhen Liu, Xizhang Wei, Xiang Li
2012 Electromagnetic Waves  
We present an adaptive clutter suppression method for airborne random pulse repetition interval radar by using prior knowledge of clutter boundary in Doppler spectrum.  ...  In this method, by exploiting the intrinsic sparsity, compressed sensing based on iterative grid optimization (CS-IGO) is applied to directly recover the clutter spectrum with only the test range cell  ...  Assume that the radar works on X-band whose wavelength is 0.03 m, the coherent processing interval is 6.4 ms and the width of each pulse in the train is 2 µs.  ... 
doi:10.2528/pier12022001 fatcat:ihjzk4s6tzgq5icckl44wd45jq

Low‐slow‐small target detection using stepped‐frequency signals in a strong folded clutter environment

Jinpeng Guo, Shaoqiang Chang, Fawei Yang, Jinjian Cai, Quanhua Liu, Teng Long
2021 IET radar, sonar & navigation  
Specifically, signal parameters including the frequency step number and the step sequence are optimised based on the clutter cognition results.  ...  For ground-based surveillance radars (GSR), the folded-clutter is an important factor affecting LSS target detection performance.  ...  There is no clutter in the first range ambiguity interval in these experiments to focus on the influence of the folded-clutter on the LSS target detection.  ... 
doi:10.1049/rsn2.12095 fatcat:ugyjuyik4ngfnps73hgb6fm3ji

SELECTOR OF CLASSIFIED TRAINING SAMPLES FOR SPATIAL PROCESSING OF SIGNALS UNDER THE IMPACT OF COMBINED CLUTTER AND JAMMING

D. M. Piza, T. I. Bugrova, V. M. Lavrentiev, D. S. Semenov
2018 Radìoelektronika, Ìnformatika, Upravlìnnâ  
clutter on a spatial filter adaptation process.  ...  Using of the on-the-fly analysis of the combined clutter and jamming components in each range resolution element improves the quality of the clutter classification, which is important in complex hydrometeorological  ...  Therefore, we can assume that, taking into consideration real spatial distribution of passive clutter, on the scanning range it is possible to find time intervals to form the classified training samples  ... 
doi:10.15588/1607-3274-2017-4-3 fatcat:fdpqqyygqnaozdjp23aggfbifm

A New PHD Algorithm in Unknown Clutter Environment Based on Box Particle

Shuai WEI, Xin-xi FENG, Quan WANG
2017 DEStech Transactions on Computer Science and Engineering  
Aiming at the problems, a new PHD filter tracking algorithm in unknown clutter environment based on interval analysis was proposed.  ...  Next, using measurement model set up clutter model and derived to multi-target updated state function based on box particles.  ...  So we introduce the interval analysis technique, and propose the PHD algorithm based on box particle filter in unknown clutter state.  ... 
doi:10.12783/dtcse/smce2017/12466 fatcat:ecmdmzxfb5g4vixfax5sq5dcfu

A New Approach to Detect Ground Clutter Mixed With Weather Signals

Yinguang Li, Guifu Zhang, Richard J. Doviak, Lei Lei, Qing Cao
2013 IEEE Transactions on Geoscience and Remote Sensing  
This work is focused on detecting ground clutter mixed with weather signals, even if the clutter power to signal power ratio is low.  ...  (SCI) algorithm has been developed to detect ground clutter using single polarization radars, but SCI can be extended for dual-pol radars.  ...  If all the phase elements within the spectral interval are on a line, SPF is equal to zero.  ... 
doi:10.1109/tgrs.2012.2209658 fatcat:uhmn32amivchbp2ozekvy6uj3u

Optimal selection of the CA-CFAR adjustment factor for K power sea clutter with statistical variations

José Raúl Machado Fernández, Jesús De la Concepción Bacallao Vidal
2017 Ciencia e Ingeniería Neogranadina  
La distribución K fue elegida como el modelo usado para el clutter, gracias a su amplia popularidad.  ...  <p>La presencia de la señal interferente de clutter marino establece limitaciones en la calidad de la detección de radar en ambientes costeros y de alta mar.  ...  Likewise, as it was suggested in the paper, the authors will focus next on the creation of overall adaptive solutions on K power clutter, which will include the estimation of the shape parameter by applying  ... 
doi:10.18359/rcin.1714 fatcat:vn2u4c7gkjhcre4v6ehiyb43zq

Weak Target Detection within the Nonhomogeneous Ionospheric Clutter Background of HFSWR Based on STAP

Xin Zhang, Qiang Yang, Weibo Deng
2013 International Journal of Antennas and Propagation  
clutter.  ...  In this paper, a novel algorithm based on angle-Doppler joint eigenvector which considers the angle-Doppler map of radar echoes is adopted to analyze the characteristics of the nonhomogeneous ionospheric  ...  The correlation coefficient at beam interval 5 ∘ is greater than the ones when the beam intervals are 10 ∘ and 15 ∘ . Figure 3 (b).  ... 
doi:10.1155/2013/382516 fatcat:bymza5yfdfdfnfpqpggovwe5fm

Adaptive clutter suppression method for three dimensional Doppler radar

Grigoriy Lesnikov, Mikhail Noniashvilli, Alexander Iliyasafov, P. Yermolov
2019 ITM Web of Conferences  
The heuristic method for clutter suppression in three dimensional (3D) Doppler radar is proposed. The algorithm for suggested method was developed and experimentally verified.  ...  [1, 2] This huge category starts with simple algorithms based on multichannel Doppler filters and ends with complex ones based on adaptive lattice filters [4, 5, 6] .  ...  interval in Doppler frequency.  ... 
doi:10.1051/itmconf/20193015031 fatcat:ybpjlhvdkjgelilkndesxtahhy

Estimation of Parameters Reflected Discrete Clutter Signals

Katsumi Ohnishi
2019 Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications  
The objective of this paper is to present an algorithm to estimate the relative ranges, angle-of-arrivals (AoAs), and Doppler frequencies of the discrete clutter signals depending on the measurements by  ...  The discrete clutter signals are generated through the multipath reflections of the emitter signal. The technical challenges are identified and an algorithm to resolve them is presented.  ...  • τ nm : time delay of the m-th clutter pulse with respect to the emitter arrival time of the n-th array element • T r : pulse repetition interval (PRI) • M : the number of clutters • ∆: sampling interval  ... 
doi:10.5687/sss.2019.147 fatcat:6hgv6znfbndrdoxth54g274rfe

PHASE SENSITIVE NON-COHERENT MTI RADAR SYSTEM WITH BETTER RADAR RANGE RESOLUTION

Semi S., Jamil S.
2003 International Conference on Aerospace Sciences and Aviation Technology  
It cancels the moving clutter patch, but with doubled target plot width on the screen, not tripled, if target exists within clutter batch.  ...  plot will be tripled on the radar screen if the target exists within the clutter patch and will be doubled if the target exists at the leading or trailing edge of the clutter patch .  ...  Rol -initial clutter cell distance. rpn -transmitter random initial phase in the nth period interval. Pref.c/ -clutter reflection phase. q'ref .tar. target reflection phase.  ... 
doi:10.21608/asat.2013.24697 fatcat:nxkmrk7syvf37pqhhi7pzgdsvi

Adaptive learning and recall of motor-sensory sequences in adult echolocating bats

Mor Taub, Yossi Yovel
2021 BMC Biology  
cluttered environment.  ...  This is especially true for echolocating bats that forage in diverse environments, moving between open spaces to highly complex ones.  ...  Amichai for assistance with the setup and parameter extraction and for helpful comments on the earlier version of this manuscript.  ... 
doi:10.1186/s12915-021-01099-w pmid:34412628 pmcid:PMC8377959 fatcat:dvlyw7ysjzbdlfmiizhpdq45fm

New Algorithm for Detecting Target on the Clutter Background Using Polarimetric Parameter

Pham Trong Hung, Pham Minh Nghia, Nguyen Trung Thanh
2017 REV Journal on Electronics and Communications  
Proposed algorithm shows the efficiency of using ellipticity coefficient in detecting target on the background clutter.  ...  This paper proposes a new algorithm for detecting radar targets on the clutter background using a nonenergy polarimetry parameter, the ellipticity coefficient.  ...  Instead, the elliptic angle is determined on the interval −π/4 < α < π/4, and then the elliptic coefficient is determined on the interval −1 ≤ K ≤ 1 accordingly.  ... 
doi:10.21553/rev-jec.112 fatcat:yrrwmvu7ozco3kjjwgskqxhyia

Analysis of Bistatic Ground Clutter

J. Pidanic, K. Juryca, A. M. Kumar
2018 Radioengineering  
The residuals of the signal are used for bistatic clutter analysis and consequently used for determination of bistatic clutter parameters.  ...  This article presents analysis and parametrization of the bistatic ground clutter which is important from the point of view of the modelling/generating of bistatic clutter, and subsequent developing of  ...  The paper is based on a diploma thesis by Jan Pulpan and mentor Jan Pidanic.  ... 
doi:10.13164/re.2018.0856 fatcat:ere3fmd6q5b5xmpxd2hotdnpgy
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