Geometric Match Filter and It’s Response to Dense Fake Signal

2020 ◽  
Author(s):  
Liang Pu ◽  
Wang Min ◽  
Fan Hongqi
Keyword(s):  
Match Filter

scholarly journals Optimizing Transmit Sequence and Instrumental Variables Receiver for Dual-Function Complexity System

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yu Yao ◽  
Junhui Zhao ◽  
Lenan Wu
Keyword(s):  
Approximate Solution ◽  
Instrumental Variables ◽  
Performance Index ◽  
Dual Function ◽  
Np Hard ◽  
Match Filter ◽  
Filter Output ◽  
Phase Code ◽  
Discrete Phase ◽  
Simulation Results

This correspondence deals with the joint cognitive design of transmit coded sequences and instrumental variables (IV) receive filter to enhance the performance of a dual-function radar-communication (DFRC) system in the presence of clutter disturbance. The IV receiver can reject clutter more efficiently than the match filter. The signal-to-clutter-and-noise ratio (SCNR) of the IV filter output is viewed as the performance index of the complexity system. We focus on phase only sequences, sharing both a continuous and a discrete phase code and develop optimization algorithms to achieve reasonable pairs of transmit coded sequences and IV receiver that fine approximate the behavior of the optimum SCNR. All iterations involve the solution of NP-hard quadratic fractional problems. The relaxation plus randomization technique is used to find an approximate solution. The complexity, corresponding to the operation of the proposed algorithms, depends on the number of acceptable iterations along with on and the complexity involved in all iterations. Simulation results are offered to evaluate the performance generated by the proposed scheme.

Statistics of the Parseval sum, match filter, and instantaneous single‐frequency transmissions in an ocean waveguide

2006 ◽  
Vol 120 (5) ◽  
pp. 3220-3220 ◽  
Author(s):  
Mark Andrews ◽  
Tianrun Chen ◽  
Sunwoong Lee ◽  
Nicholas Makris ◽  
Purnima Ratilal
Keyword(s):  
Single Frequency ◽  
Match Filter

A dual-band tri-mode CDMA IF receiver with programmable channel-match filter

2003 ◽  
Author(s):  
J. Cho ◽  
P. Good ◽  
M. Kamat ◽  
E. McCarthy ◽  
K. Rampmeier ◽  
...  
Keyword(s):  
Dual Band ◽  
Match Filter

scholarly journals A Time-Domain Hybrid Analysis Method for Detecting and Quantifying T-Wave Alternans

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Xiangkui Wan ◽  
Kanghui Yan ◽  
Linlin Zhang ◽  
Yanjun Zeng
Keyword(s):  
Time Domain ◽  
Correlation Method ◽  
Filter Method ◽  
Least Squares Regression ◽  
Analysis Method ◽  
Hybrid Analysis ◽  
Match Filter ◽  
T Wave ◽  
Increased Risk ◽  
T Wave Alternans

T-wave alternans (TWA) in surface electrocardiograph (ECG) signals has been recognized as a marker of cardiac electrical instability and is hypothesized to be associated with increased risk for ventricular arrhythmias among patients. A novel time-domain TWA hybrid analysis method (HAM) utilizing the correlation method and least squares regression technique is described in this paper. Simulated ECGs containing artificial TWA (cases of absence of TWA and presence of stationary or time-varying or phase-reversal TWA) under different baseline wanderings are used to test the method, and the results show that HAM has a better ability of quantifying TWA amplitude compared with the correlation method (CM) and adapting match filter method (AMFM). The HAM is subsequently used to analyze the clinical ECGs, and results produced by the HAM have, in general, demonstrated consistency with those produced by the CM and the AMFM, while the quantifying TWA amplitudes by the HAM are universally higher than those by the other two methods.

Seafloor Erosion induced by overbanking flow derived by a 2.5D high resolution sparker seismic dataset, uppermost Kaoping Submarine Canyon, southwestern offshore Taiwan

2020 ◽  
Author(s):  
Wei-Chung Hsiao ◽  
Yi-Ching Yeh ◽  
Yen-Yu Cho ◽  
Shu-Kun Hsu
Keyword(s):  
River Mouth ◽  
Seismic Source ◽  
Submarine Canyon ◽  
Point Of View ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Match Filter ◽  
The North ◽  
Manila Trench ◽  
Marine Seismic

<p>The Kaoping submarine canyon (KPSC) originates from Kaoping River, southwestern Taiwan that extends about 250 kilometers long from the Kaoping River mouth down to the Manila Trench. It can be divided into three major sections: upper reach (meandering), middle reach (NW-SE trending and V-shaped canyon) and lower reach (meandering). Based on recent a swath bathymetric data in the uppermost KPSC, an obvious seafloor depression can be observed in the eastern bank of the canyon. The eastern bank of the canyon reveals about 30-50 meters in average lower than western bank. The mechanism is blurred. In this study, to investigate fine sedimentary structures in 3D point of view, we used marine sparker seismic method. The seismic source frequency varies from 100 to 1200 Hz which can provide about 0.6 meters vertical resolution (i.e. central frequency 600 Hz and 1,600 m/s Vp). We have collected 75 in-lines across the canyon and 3 cross-lines perpendicular to the in-line. The data went through conventional marine seismic data processing procedures such as bad trace kill, band-pass filter, 2D geometry settings, NMO stacking, swell correction, match filter and predictive deconvolution. The 2D dataset was reformatted by applying 3D geometry settings to create a 3D seismic cube. The result shows that a wide incision channel was first found in the north of Xiaoliuchiu islet. Through depth, this channel becomes two narrower channels divided by a mud diapir. This down cutting can be traced down to transgressive sequence in prior to LGM (Last Glacial Maximum). In addition, a deep-towed sub-bottom profiler shows an obvious down-lapping structures heading off canyon that indicates over banking flow may be a key role to cause this erosional event.</p>

Automatic detection and extraction algorithm of coronal loops based on match filter and oriented directivity

2019 ◽  
Vol 490 (4) ◽  
pp. 5567-5584
Author(s):  
Song Zhiming ◽  
Yan Xiaoli ◽  
Qu Zhongquan ◽  
Li Hong-Bo
Keyword(s):  
Coronal Loops ◽  
Solar Dynamics Observatory ◽  
Pass Filter ◽  
Match Filter ◽  
Unsharp Mask ◽  
Global Threshold ◽  
Extraction Algorithm ◽  
Local Direction ◽  
Solar Dynamics ◽  
High Pass

ABSTRACT In this paper, an efficient algorithm is developed to automatically detect and extract coronal loops. First of all, in the algorithm, three characteristics associated with coronal loops are used to construct a match filter able to enhance the loops. Secondly, the method combining a high-pass filter (unsharp-mask enhancement) with a global threshold is used to further enhance and segment the loops. Thirdly, to extract every individual coronal loop and obtain their parameters (the 2D projected space coordinates and lengths) from the segmented loops, a clustering method of the pixels with approximate local direction and connected domain is further used. Fourthly, to evaluate the performance of the developed algorithm, images observed by the Transition Region and Coronal Explorer (TRACE), the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO) and the High-Resolution Coronal Imager (Hi-C) are used, and comparison experiments between the existing algorithms and the developed algorithm are performed. Finally, it is found that the developed algorithm is commensurate with the two most promising algorithms, oriented coronal curved loop tracing (OCCULT) and its improved version, OCCULT-2, in performance. Therefore, for scientific applications associated with coronal loops, the developed algorithm will be a powerful tool.

Sign in / Sign up

Export Citation Format

Share Document