PROBLEM TO BE SOLVED: To provide a mechanical method that can determine the stages of silkworms breeding (mounting of silkworms, for example) without relying on the hunch or experiences of experts (sericulturists).SOLUTION: A Doppler radar detector R includes a spectrum calculation section for calculating the spectrum of Doppler transitions between radar sending/receiving signals and a rate distribution evaluation section for evaluating the degree of spreading to a higher rate direction of a rate distribution of the position of a radar sending/receiving antenna on the silkworms group on a silkworm seat S made of silkworms W based on the degree of spreading of the spectrum of the Doppler transitions between radar sending/receiving signals to the higher frequency direction.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】蚕の飼育の各段階(例えば、上蔟時期)を適切に判定するにあたり、熟練者(養蚕業者)の勘と経験によらない機械的な方法を提供する。【解決手段】ドプラレーダ検出装置Rは、レーダ送受信信号間のドプラ偏移のスペクトルを算出するスペクトル算出部と、レーダ送受信信号間のドプラ偏移のスペクトルの高周波数方向への広がり程度に基づいて、複数の蚕Wで構成される蚕座S上の蚕群に関するレーダ送受信アンテナの位置に対する速度分布の高速度方向への広がり程度を評価する速度分布評価部と、を備える。【選択図】図1
