THE EFFECT OF EXPONENTIAL/COSINE HYPERBOLIC/ POLYNOMIAL/ KAISER WINDOW PARAMETERS CG-ICG-ENBW-SL ON THE SNR IMPROVEMENT OF MST RADAR SIGNALS

B.Ramesh Reddy, A.Subbarami Reddy, P.Chandrashekar Reddy

Abstract: In this paper, the effect of Exponential/Cosine Hyperbolic/Polynomial/Kaiser window parameters Coherent Gain (CG), Incoherent Power Gain (ICG), Equivalent Noise Band Width (ENBW) and Scalloping Loss (SL) on the SNR values of MST Radar returns has been investigated. Six sets of multibeam observations of the lower atmosphere made by the Indian Mesosphere-StratosphereTroposphere (MST) RADAR are used for the result analysis. Prior to the Fourier Transform, the in-phase and quadrature components of the Radar echo samples are weighted with Exponential/Cosine Hyperbolic/Polynomial/Kaiser window Functions. It is observed that, with the increase in the parameter “a” of Exponential and Cosine Hyperbolic Window and parameter “m” of Polynomial Window increases ENBW and SL, but decreases in CG and ICG. This observation can be used to establish in improving the Signal to Noise Ratio (SNR) of MST RADAR signals. From this study it is reported that, the window e parameter “a=6/m=4”can be suggested for optimum results of SNR improvement in MST RADAR signals. The optimum widow parameter“a/m” in turn yields optimum Exponential window parameters as “CG=0.4768, ICG=0.3495, ENBW=1.5371, SL=0.8536”, Cosine Hyperbolic window parameters as “CG=0.4769, ICG=0.3495, ENBW=1.5366, SL=0.8535”, Polynomial window parameters as “CG=0.5719, ICG=0.4799, ENBW=1.4673, SL=0.8011”, and Kaiser window parameters as “CG=0.4991, ICG=0.3660, ENBW=1.4695, SL=0.8410”.Which corresponds to optimum mail lobe width and side lobe attenuation to increase the SNR of MST Radar noisy data.

Keywords: CG, ICG, ENBW, SL, SNR, FFT, Spectral Analysis.

DOI: https://doi.org/10.15623/ijret.2013.0208045