Title :
Efficient decimation filter design for lofargram analysis in passive sonar systems
Author :
Gonçalves, Marleusa Correa ; Petraglia, Antonio
Author_Institution :
Programa de Engenharia Eletrica, Univ. Fed. do Rio de Janeiro, Brazil
Abstract :
A new class of low-sensitivity decimation filters based on the polyphase decomposition of infinite impulse response (IIR) transfer functions is proposed. The design approach makes use of optimized positioning of poles and zeros so that transfer functions having unequal numerator and denominator orders are obtained. Comparisons with conventional elliptic filters are shown. An illustrative example of application in passive sonar systems using real noisy data is provided. A weighted stopband filter design is presented and its performance in improving lofargram analysis in passive sonar signal processing is verified.
Keywords :
IIR filters; low-pass filters; poles and zeros; sonar signal processing; spectral analysis; transfer functions; Lofargram analysis; decimation filter design; digital filters; elliptic filters; infinite impulse response transfer functions; low-sensitivity decimation filters; passive sonar signal processing; passive sonar systems; poles and zeros; polyphase decomposition; signal resolution; spectral analysis; transfer function decomposition; weighted stopband filter design; Design optimization; IIR filters; Passive filters; Performance analysis; Poles and zeros; Signal analysis; Signal design; Signal processing; Sonar applications; Transfer functions; Digital filters; signal resolution; sonar signal processing; spectral analysis;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2005.860864
