PROBLEM TO BE SOLVED: To provide a biological information measuring system which enables desired information relating to a subject to be obtained by obtaining a phase difference while properly adjusting the level of a signal based on a reflected wave reflected by the surface of the subject of microwaves applied to the subject so as to avoid influence of noise accompanying a movement of the subject not subjected to measurement.SOLUTION: A reflected wave signal including a noise component obtained by a microwave transmission and reception unit 11 is subjected to adjustment of fixing the level of a reflected wave signal by an adjustment unit 12. Variation in amplitude component in an in-phase component signal and an orthogonal component signal obtained by a quadrature detection unit 13 is suppressed to eliminate an influence of the variation in the amplitude component on the calculation of a phase difference by an arithmetic unit 14. Accordingly, a phase difference signal properly corresponding to the micromotion of an object to be measured is obtained efficiently. Using the phase difference signal, the states of heart rate, respiration, or the like are measured appropriately and the state of the subject is evaluated appropriately.COPYRIGHT: (C)2011,JPO&INPIT【課題】被験体に照射したマイクロ波の被験体表面での反射波に基づく信号のレベルを適切に調整しつつ位相差を求めて、被験体の測定対象外の動きに伴うノイズの影響を避け、被験体に係る所望の情報を適切に把握可能とする生体情報測定システムを提供する。【解決手段】マイクロ波送受信部11によって得られたノイズ成分も含む反射波信号について、調整部12で反射波信号のレベルを一定にする調整を実行し、クオドラチャ検出部13で求められる同相成分信号と直交成分信号における振幅成分の変化を抑え、振幅成分変化が演算部14における位相差の算出に与える影響を排除することから、測定対象の微動に適切に対応する位相差信号を効率よく求められ、この位相差信号を用いて、体表の微動としてあらわれる例えば心拍や呼吸等の状態を正しく測定でき、被験体の状態を正確に評価できる。【選択図】図1
