FRAME SYNCHRONIZING DEVICE, MEASURING APPARATUS WITH THE SAME, FRAME SYNCHRONIZING METHOD AND MEASURING METHOD

To provide a frame synchronizing device capable of accurately detecting a frame head position even in a case where signal quality is relatively low.SOLUTION: A frame synchronizing device 30 comprises: a head-side correlation value calculation part 42 for calculating a head-side correlation value between each piece of data in a head-side data region of a reference frame having the same format as that of an input frame included in an orthogonal demodulation signal (b) and each piece of data in a head-side data region of the orthogonal demodulation signal (b); a head-side correlation value integration part 44 which integrates head-side correlation values and calculates an integrated head-side correlation value; a tail-side correlation value calculation part 43 for calculating a tail-side correlation value between each piece of data in a tail-side data region of the reference frame and each piece of data in a tail-side data region of the orthogonal demodulation signal (b); a tail-side correlation value integration part 45 which integrates the tail-side correlation values and calculates an integrated tail-side correlation value; and a head position detection part 34 which detects a head position of the input frame based on a complex conjugate product of the integrated head-side correlation value and the integrated tail-side correlation value.SELECTED DRAWING: Figure 1 【課題】信号品質が比較的悪い場合でも、フレーム先頭位置を正確に検出することができるフレーム同期装置を提供する。【解決手段】フレーム同期装置３０は、直交復調信号ｂに含まれる入力フレームと同じフォーマットを有する参照フレームの先頭側データ領域の各データと直交復調信号ｂの先頭側データ領域の各データとの間で先頭側相関値を算出する先頭側相関値算出部４２と、先頭側相関値を積算して積算先頭側相関値を算出する先頭側相関値積算部４４と、参照フレームの末尾側データ領域の各データと直交復調信号ｂの末尾側データ領域の各データとの間で末尾側相関値を算出する末尾側相関値算出部４３と、末尾側相関値を積算して積算末尾側相関値を算出する末尾側相関値積算部４５と、積算先頭側相関値と積算末尾側相関値との複素共役積に基づいて入力フレームの先頭位置を検出する先頭位置検出部３４と、を備える。【選択図】図１