Suppression of Log-Normal Distributed Weather Clutter Observed by an S-Band Radar

• 作者: Seishiro Ishii Shuji Sayama
• 来源期刊: 无线工程与技术(英文)
• 学科: 医学
• 关键词: CFAR S-BAND RADAR WEATHER CLUTTER Log-Normal Distribution
• 年，卷（期）: 2013,（3）
• 页码范围: 125-133
• 页数: 9页
• 分类号: R73

摘要

We have observed weather clutter containing targets (ships) using an S-band radar with a frequency 3.05 GHz, a beam width 1.8°, and a pulsewidth 0.5 μs. To investigate the weather clutter amplitude statistics, we introduce the Akaike Information Criterion (AIC). We have found that the weather clutter amplitudes obey the log-normal, Weibull, and log-Weibull distributions with the shape parameters of 0.308 to 0.470, 4.42 to 4.51, and 15.91 to 16.44, respectively, for small data within the beam width of an antenna. We have proposed the log-normal/CFAR circuit modified a Cell-Averaging (CA) LOG/CFAR circuit. It is found that weather clutter is suppressed with improvement of 51.58 dB by log-normal/CFAR. As a result, we have showed that weather clutter observed by S-band radar does not obey the Rayleigh distribution and our log-normal/CFAR circuit has an effect on suppression of clutter and detection of target, while conventional LOG/CFAR circuit does not. In addition, if our circuit can be realized, we will have an advantage economically.