ログワイブル分布の部分的Q-Q確率プロットの推定精度

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2019/11/01

タイトル(英語): Estimation Accuracy of Partial Q-Q Plot of Log-Weibull Distribution

著者名: 佐山　周次（防衛大学校通信工学科）

著者名(英語): Shuji Sayama (Department of Communications Engineering, National Defense Academy)

キーワード: Xバンドレーダ，シークラッタ，ログワイブル分布，部分的Q-Q確率プロット　　X-band radar，sea clutter，log-Weibull distribution，partial Q-Q plot

要約(英語): In stormy weather due to typhoon approaching the Kanto district, I have observed sea clutter containing a target (ship) using an X-band radar with a frequency of 9.41GHz, a beamwidth of 1.0°, a pulsewidth of 0.5μs, and a pulse-repetition frequency of 1,600Hz. To estimate the sea clutter amplitude statistics, I have used partial Q-Q plot. The partial Q-Q plot is as follows : locate the maximum value on the histogram of observed data and find the point on Q-Q plot corresponding to the maximum value. Fit the approximate line to this point and the nearest ones on both sides by least squares method. Adding a neighbor point on the right side of these ones, fit it similarly, and then adding a neighbor point on the left side of these ones, fit it similarly. Repeat them and select the approximate line giving the smallest RMSE (Root Mean Square Error). I have found that the sea clutter amplitudes obey the log-Weibull distribution with the shape parameters of c=21.13 for entire data and c=17.80 to 32.26 for data within the beam width of an antenna. When sea clutter contains a target, it is found that the partial Q-Q plot is more rigorous fit of the distribution to the data than maximum log-likelihood method.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.139 No.11 （2019） 特集Ⅰ：電気電子工学関連分野における教育フロンティア　特集Ⅱ：イノベーションを創出する最新の計測技術2019

本誌掲載ページ: 596-602 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/139/11/139_596/_article/-char/ja/