A Fast Direction Finding Algorithm Based on Correlation Processing

2013 ◽  
Vol 373-375 ◽  
pp. 880-883 ◽  
Author(s):  
Dong Liang Guo ◽  
Zhong Hua Li
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Correlation Coefficients ◽  
Computation Time ◽  
Direction Finding ◽  
Practical Application ◽  
Maximal Correlation ◽  
Correlation Processing ◽  
Simulation Results ◽  
Angle Interval

To reduce the computational complexity of direction finding algorithms based on correlation processing, a fast algorithm is presented in this paper. Unlike the conventional direction finding algorithms which calculates the correlation coefficients in the whole azimuth range, the improved algorithm measure the direction of arrival (DOA) roughly first, then, measure the DOA only in finite angle interval and searches the maximal correlation coefficient, thus shorten the execution time greatly. In addition, the algorithm has no influence on the accuracy of direction finding. The best proportion between samples for rough measurement and samples for fine measurement is analyzed. Computer simulation results confirm that the proposed method can shorten the computation time greatly, and the proposed algorithm has practical application value in the instantaneous direction finding.

A Unitary-UCA-Root-MUSIC Algorithm Based on MSWF

2014 ◽  
Vol 610 ◽  
pp. 339-344
Author(s):  
Qiang Guo ◽  
Yun Fei An
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Real Time ◽  
Unitary Transformation ◽  
Wiener Filter ◽  
Doa Estimation ◽  
Signal Subspace ◽  
Music Algorithm ◽  
Multi Stage ◽  
Simulation Results

A UCA-Root-MUSIC algorithm for direction-of-arrival (DOA) estimation is proposed in this paper which is based on UCA-RB-MUSIC [1]. The method utilizes not only a unitary transformation matrix different from UCA-RB-MUSIC but also the multi-stage Wiener filter (MSWF) to estimate the signal subspace and the number of sources, so that the new method has lower computational complexity and is more conducive to the real-time implementation. The computer simulation results demonstrate the improvement with the proposed method.

scholarly journals Direction Finding of Coherent Sources Using a MIMO Array of Triaxial Velocity Sensors

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Yuwei Song ◽  
Guoping Hu ◽  
Guimei Zheng
Keyword(s):  
Cross Correlation ◽  
Correlation Coefficients ◽  
Direction Finding ◽  
Covariance Matrices ◽  
Smoothing Algorithm ◽  
Arbitrary Configuration ◽  
Effective Aperture ◽  
Vector Sensors ◽  
Coherent Sources ◽  
Simulation Results

In the received side, triaxial velocity sensors of MIMO array are used to solve the problem of coherent source direction-finding in this paper. A new velocity field smoothing algorithm is presented to decorrelate coherent sources. The identically oriented velocity sensors of whole array are divided into three subarrays. Then, the covariance matrices of the three subarrays are smoothed to restore the rank of source covariance matrix (SCM). Lastly, the cross-correlation coefficients of the SCM after smoothing processing are calculated to analyze the performance of decorrelation. The proposed decorrelation algorithm (1) does not need the information of locations of velocity vector sensors; (2) is suitable for arbitrary configuration array; and (3) has no loss of array effective aperture. Simulation results prove the effectiveness of the proposed algorithm.

scholarly journals Angle Multiplexing Optical Image Encryption in the Fresnel Transform Domain Using Phase-Only Computer-Generated Hologram

Photonics ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Hsuan T. Chang ◽  
Yao-Ting Wang ◽  
Chien-Yu Chen
Keyword(s):  
Computer Simulation ◽  
Image Quality ◽  
Image Encryption ◽  
Correlation Coefficients ◽  
Security Level ◽  
Transform Domain ◽  
Computer Generated Hologram ◽  
Fresnel Transform ◽  
Simulation Results ◽  
Optical Image Encryption

We propose an angle multiplexing method for optics-based image encryption using a phase-only computer-generated hologram (POCGH) in the tilted Fresnel transform (TFrT) domain. Modified Gerchberg-Saxton algorithms, based on the three types of rotation manipulation in both the hologram and reconstruction planes, are used with their corresponding TFrT parameters to extract the phase-only functions (POFs) of the target images. All the extracted POFs are then phase-modulated and summed to obtain the final POCGH, which is capable of multiplexing and avoiding overlap in the reconstructed images. The computer simulation results show that the images corresponding to the various rotation manipulations at the hologram and image reconstruction planes can be successfully restored with high correlation coefficients. Due to the encrypted nature of the multiplexed images, a higher system security level can be achieved, as the images can only be correctly displayed when all the required parameters in the TFrT are available. The angle sensitivity on the image quality for each manipulation is also investigated.

FAST CALCULATION OF 8 × 8 INTEGER DCT IN THE SOFTWARE IMPLEMENTATION OF H.264/AVC

2014 ◽  
Vol 23 (05) ◽  
pp. 1450069
Author(s):  
FARZAD ZARGARI ◽  
SEDIGHE GHORBANI
Keyword(s):  
Computational Complexity ◽  
Video Coding ◽  
Computation Time ◽  
Software Implementation ◽  
Fast Calculation ◽  
Compression Performance ◽  
Integer Dct ◽  
Simulation Results ◽  
Advanced Video Coding ◽  
High Computational Complexity

In order to achieve higher compression performance the fidelity range extension (FRExt) amendment was added to the H.264 advanced video coding (AVC) standard. It uses both 4 × 4 and 8 × 8 integer discrete cosine transform (DCT) adaptively in the high profiles. This led to additional complexity of the initial version of the H.264/AVC encoder which had substantially high computational complexity. In this paper, we propose a new algorithm which reduces the computational complexity for software implementation of horizontal 8 × 8 integer DCT by more than 25%. Simulation results indicate 22% reduction in the computation time by using the proposed algorithm.

scholarly journals APPLICATION EXPERIENCE OF COMPUTER SIMULATION SYSTEMS TO INCREASE THE EFFICIENCY OF FOUNDRY PRODUCTION AT THE ROSTOV FOUNDRY

2018 ◽  
pp. 72-76
Author(s):  
A. V. Fedosov ◽  
G. V. Chumachenko
Keyword(s):  
Computer Simulation ◽  
Systematic Approach ◽  
Practical Application ◽  
Simulation Tools ◽  
Shrinkage Defects ◽  
Gate System ◽  
System Equations ◽  
Simulation Results ◽  
Definition Of ◽  
Simulation Systems

The stages of introduction of computer simulation tools in the production process of The Rostov Foundry are considered. A system for estimating the results of simulation is proposed, which includes the definition of complex parameters that allow an assessment of the causes and the probability of formation of shrinkage defects. An equation that determines a relationship between results of simulation and actual rejects in production is proposed. The feeder operation index is suggested to use for estimation of the reasons for the formation of shrinkage defects. The yield index is suggested to evaluate the possibility of reducing the weight of gate system. Equations for calculating of these indices are developed. A systematic approach is presented for the application of simulation results, which provides for the organization of a database of the technologies being studied. The development of this base allows not only to accumulate the experience, but also to apply it to minimize errors and save time in the process of introducing new castings. The results of practical application of the developed system for 10 positions are presented, which allowed to increase the yield by 6.9% and to reduce the total defects rate by 5.1%.

scholarly journals Robust Cyclic MUSIC Algorithm for Finding Directions in Impulsive Noise Environment

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Sen Li ◽  
Xiaojing Chen ◽  
Rongxi He
Keyword(s):  
Computer Simulation ◽  
Correlation Matrix ◽  
Stable Distribution ◽  
Robust Statistics ◽  
Impulsive Noise ◽  
Direction Finding ◽  
Music Algorithm ◽  
Second Order Statistics ◽  
Simulation Results ◽  
Cyclostationary Signal

This paper addresses the issue of direction finding of a cyclostationary signal under impulsive noise environments modeled byα-stable distribution. Sinceα-stable distribution does not have finite second-order statistics, the conventional cyclic correlation-based signal-selective direction finding algorithms do not work effectively. To resolve this problem, we define two robust cyclic correlation functions which are derived from robust statistics property of the correntropy and the nonlinear transformation, respectively. The MUSIC algorithm with the robust cyclic correlation matrix of the received signals of arrays is then used to estimate the direction of cyclostationary signal in the presence of impulsive noise. The computer simulation results demonstrate that the two proposed robust cyclic correlation-based algorithms outperform the conventional cyclic correlation and the fractional lower order cyclic correlation based methods.

Active Noise Canceling

2011 ◽  
pp. 286-308 ◽  
Author(s):  
Hector Perez-Meana ◽  
Mariko Nakano-Miyatake
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Noise Cancellation ◽  
Hybrid Structure ◽  
Least Square ◽  
Recursive Least Square ◽  
Estimation Algorithms ◽  
Acoustic Feedback ◽  
Active Noise ◽  
Simulation Results

Some of the main problems present in active noise cancellations are the feedback distortion due to the acoustic feedback between the cancellation speaker and the input microphone; the high computational complexity when recursive least square algorithms are used; and the secondary path estimation. This chapter presents a review of some successful solutions to these problems, such as a hybrid structure to reduce the feedback distortion; active noise cancellation (ANC) FxRLS algorithms in which the filter input signal is decomposed into a finite number; and mutually near orthogonal signal components, as well as successful secondary path estimation algorithms. Computer simulation results confirm the desirable properties of presented ANC structures.

SIMULATION OF SOFT START OF SYNCHRONOUS ELECTRIC DRIVES

2019 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Water Supply Systems ◽  
Factors Affecting ◽  
Electric Drives ◽  
Soft Start ◽  
Simulation Results ◽  
Pumping Units ◽  
Negative Factors ◽  
Supply Systems

The main negative factors affecting the starting modes of synchronous electric drives of pumping units of irrigation water supply systems were identified, computer simulation of direct and soft start of synchronous electric drive was made, the simulation results are shown in graphs and a brief conclusion was made on the study.

Computer simulation to evaluate the economics of landfill gas recovery

1998 ◽  
Vol 38 (2) ◽  
pp. 201-208
Author(s):  
M. W. Milke
Keyword(s):  
Computer Simulation ◽  
Computer Program ◽  
Landfill Gas ◽  
Base Case ◽  
Simulation Tool ◽  
Hypothetical Case ◽  
Gas Recovery ◽  
Fixed Set ◽  
Key Variables ◽  
Simulation Results

A need exists for tools to improve evaluations of the economics of landfill gas recovery. A computer simulation tool is presented. It uses a spreadsheet computer program to calculate the economics for a fixed set of inputs, and a simulation program to consider variations in the inputs. The method calculates the methane generated each year, and estimates the costs and incomes associated with the recovery and sale of the gas. Base case results are presented for a city of 500,000. An uncertainty analysis for a hypothetical case is presented. The simulation results can help an analyst see the key variables affecting the economics of a project.

Study on Optimization of the Number of DF Stations

2014 ◽  
Vol 709 ◽  
pp. 485-490
Author(s):  
Xiang Wu ◽  
Jun Jun Zong ◽  
Xun Xue Cui ◽  
Chuan Xu Liu
Keyword(s):  
Maximum Likelihood ◽  
Maximum Likelihood Estimation ◽  
Likelihood Estimation ◽  
Direction Finding ◽  
Location Error ◽  
Location Accuracy ◽  
Error Models ◽  
Reasonable Number ◽  
Simulation Results

Reasonable number of direction finding station is examined in multi-station bearing-crossing location. Though it is believed that increasing the number of station is helpful to improve the location accuracy, In the paper, the maximum likelihood estimation (MLE) as an example. The algorithms and the location error models are given. The simulation results show that the location accuracy will be improved quickly with the increase of the number of the measuring participants, but the improvement will be sharply slowed down if too many station involved, which also boost the complexity of location.

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