Null steering Optimization based MVDR beamformer using hybrid PSOGSA approach for antenna array system

2016 ◽  
Author(s):  
Suhail Najm Shahab ◽  
Ayib Rosdi Zainun ◽  
Nurul Hazlina Noordin ◽  
Izzeldin Ibrahim Mohamed ◽  
Wisam Dawood Abdullah
Keyword(s):  
Antenna Array ◽  
Null Steering

scholarly journals Null Steering in Failed Antenna Arrays

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Om Prakash Acharya ◽  
Amalendu Patnaik ◽  
Sachendra N. Sinha
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Correction Procedure ◽  
Swarm Optimization ◽  
Array Pattern ◽  
Null Steering ◽  
Simulation Results ◽  
Pattern Simulation

Antenna array pattern nulling is desirable in order to suppress the interfering signals. But in large antenna arrays, there is always a possibility of failure of some elements, which may degrade the radiation pattern with an increase in side lobe level (SLL) and removal of the nulls from desired position. In this paper a correction procedure is introduced based on Particle Swarm Optimization (PSO) which maintains the nulling performance of the failed antenna array. Considering the faulty elements as nonradiating elements, PSO reoptimizes the weights of the remaining radiating elements to reshape the pattern. Simulation results for a Chebyshev array with imposed single, multiple, and broad nulls with failed antenna array are presented.

Research on Beamforming Technique for Communications in Moving of Warship Circular Array Antenna

2012 ◽  
Vol 241-244 ◽  
pp. 2295-2298
Author(s):  
Qing Hua Wu ◽  
An Qing Zhang
Keyword(s):  
Antenna Array ◽  
Array Antenna ◽  
Beam Forming ◽  
Circular Array ◽  
Null Steering ◽  
Beam Directivity ◽  
Beamforming Technique ◽  
Maximum Directivity ◽  
Circular Array Antenna ◽  
Circular Antenna Array

Uniform circular antenna array of warship can bring beam and interference null steering from 360° symmetry without rotating. Directional communications can be achieved by UCA geometry. To solve the problem that warship’s stance is changed dynamically in course of sailing, a method was suggested that the electricity phases of UCA elements were changed based on information of stance about longitudinal sway, transverse sway and course. The proposed method can change beam directivity, and ensure providing a very directive pattern with stabilization, so that warships communication in moving each other. An expression of array maximum directivity forming with dynamic is proposed for UCA antenna. The simulation demonstrates that the beam forming method of communications in moving is validity, and is worth using with wide application.

A Linear Antenna Array Failure Correction with Null Steering using Firefly Algorithm

2014 ◽  
Vol 64 (2) ◽  
pp. 136-142 ◽  
Author(s):  
N. Grewal ◽  
Munish Rattan ◽  
Manjeet Patterh
Keyword(s):  
Antenna Array ◽  
Firefly Algorithm ◽  
Linear Antenna ◽  
Linear Antenna Array ◽  
Null Steering
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