Title :
An architecture dedicated to the real time processing of wide-band circular antennas
Author :
Carron, Henry ; Boizard, Jean Louis ; Albouy, Benoit
Author_Institution :
Lab. d´´Acoust. de Metrolog. et d´´Instrum., Univ. Paul Sabatier, Toulouse, France
Abstract :
We put forward a method for optimizing the directivity diagram of circular, wide-band antennas in real time. After analytically determining the expression for the directivity diagram of an antenna composed of 19 sensors organized in three rings, we show its variation with frequency and the efficiency of having a filter associated with each ring of sensors. The characteristics of the filters (frequency and phase response) were determined by minimizing the least squares error between the actual and desired diagrams over the whole interval of frequencies and angles of incidence of the wave. Approximations to these filters were then made by means of finite impulse response (FIR) digital filters. An architecture is presented for the real-time processing of the antenna signals and the simulation results obtained show the effects of directivity diagram compensation
Keywords :
FIR filters; array signal processing; least squares approximations; real-time systems; sonar arrays; sonar signal processing; FIR digital filters; compensation; directivity diagram; finite impulse response digital filters; frequency response; least squares error; phase response; real time processing; wide-band circular antennas; Broadband antennas; Digital filters; Finite impulse response filter; Frequency; Least squares approximation; Least squares methods; Optimization methods; Sensor phenomena and characterization; Signal processing; Wideband;
Conference_Titel :
OCEANS 2000 MTS/IEEE Conference and Exhibition
Conference_Location :
Providence, RI
Print_ISBN :
0-7803-6551-8
DOI :
10.1109/OCEANS.2000.882180
